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Theissmann R, Drury C, Rohe M, Koch T, Winkler J, Pikal P. Comparative electron microscopy particle sizing of TiO 2 pigments: sample preparation and measurement. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2024; 15:317-332. [PMID: 38590429 PMCID: PMC10999988 DOI: 10.3762/bjnano.15.29] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Accepted: 03/06/2024] [Indexed: 04/10/2024]
Abstract
Titanium dioxide (TiO2) pigment is a non-toxic, particulate material in widespread use and found in everyone's daily life. The particle size of the anatase or rutile crystals are optimised to produce a pigment that provides the best possible whiteness and opacity. The average particle size is intentionally much larger than the 100 nm boundary of the EU nanomaterial definition, but the TiO2 pigment manufacturing processes results in a finite nanoscale content fraction. This optically inefficient nanoscale fraction needs to be quantified in line with EU regulations. In this paper, we describe the measurement procedures used for product quality assurance by three TiO2 manufacturing companies and present number-based primary particle size distributions (PSDs) obtained in a round-robin study performed on five anatase pigments fabricated by means of sulfate processes in different plants and commonly used worldwide in food, feed, pharmaceutical and cosmetic applications. The PSDs measured by the three titanium dioxide manufacturers based on electron micrographs are in excellent agreement with one another but differ significantly from those published elsewhere. Importantly, in some cases, the PSDs result in a different regulatory classification for some of the samples tested. The electron microscopy results published here are supported by results from other complementary methods including surface area measurements. It is the intention of this publication to contribute to an ongoing discussion on size measurements of TiO2 pigments and other particulate materials and advance the development of widely acceptable, precise, and reproducible measurement protocols for measuring the number-based PSDs of particulate products in the size range of TiO2 pigments.
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Affiliation(s)
- Ralf Theissmann
- Research Services, KRONOS INT. Inc., Peschstr. 5, 51737 Leverkusen, Germany
| | - Christopher Drury
- TRONOX Pigment UK Ltd., Laporte Road, Stallingborough, North East Lincolnshire, DN40 2PR, United Kingdom
| | - Markus Rohe
- Global Special Analytics, Venator Germany GmbH, Dr.-Rudolf-Sachtleben-Str. 4, 47198 Duisburg, Germany
| | - Thomas Koch
- Research Services, KRONOS INT. Inc., Peschstr. 5, 51737 Leverkusen, Germany
| | - Jochen Winkler
- Billions Europe Ltd. (LB Group), Winder House, Kingfisher Way, Stockton on Tees, TS18 3EX, United Kingdom
| | - Petr Pikal
- R&D, PRECHEZA, nábř. Dr. Edvarda Beneše 1170/24, 750 02 Přerov, Czech Republic
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2
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Espada-Bernabé E, Moreno-Martín G, Gómez-Gómez B, Madrid Y. Assesing the behaviour of particulate/nanoparticulate form of E171 (TiO 2) food additive in colored chocolate candies before and after in vitro oral ingestion by spICP-MS, TEM and cellular in vitro models. Food Chem 2024; 432:137201. [PMID: 37625301 DOI: 10.1016/j.foodchem.2023.137201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 07/10/2023] [Accepted: 08/16/2023] [Indexed: 08/27/2023]
Abstract
Potential risk of nanoparticles present in food additives should be assessed. Although food-grade additive E171 (TiO2) has been banned by European Union due to the potential occurrence of nanometric TiO2, it is still present in stock products and permitted in other countries. TiO2 (nano)particles from the outer coating of colored chocolate candies were determined by TEM (Transmission Electron Microscopy), ICP-MS (Inductively Coupled Plasma Mass Spectrometry) and spICP-MS (Single-Particle-ICP-MS). Total titanium content was in the range of 1219 ± 83 µg g-1, except for brown and white candies. Percentage of TiO2 particles bellow 100 nm was under 25% regardless the color, with most frequent size between 120 and 160 nm. In vitro gastrointestinal assays reveal differences in bioaccessibility percentages between whole candy (14%) or aqueous extracts of the coating of candy (37%). More than 90% of bioaccessible titanium was found in particulate form. Caco-2 cells viability decreased around 65% after 24 h exposed to intestinal fraction.
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Affiliation(s)
- Elena Espada-Bernabé
- Departamento de Química Analítica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Gustavo Moreno-Martín
- Departamento de Química Analítica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain.
| | - Beatriz Gómez-Gómez
- Departamento de Química Analítica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Yolanda Madrid
- Departamento de Química Analítica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain.
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3
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Ferraris F, Adelantado C, Raggi A, Savini S, Zougagh M, Ríos Á, Cubadda F. An ICP-MS-Based Analytical Strategy for Assessing Compliance with the Ban of E 171 as a Food Additive on the EU Market. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2957. [PMID: 37999311 PMCID: PMC10674805 DOI: 10.3390/nano13222957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 11/02/2023] [Accepted: 11/14/2023] [Indexed: 11/25/2023]
Abstract
A method was developed for the determination of total titanium in food and food supplements by inductively coupled plasma mass spectrometry (ICP-MS) after microwave-assisted acid digestion of samples. Five food supplements, including one certified reference material, and 15 food products were used for method development. Key factors affecting the analytical results, such as the composition of the acid mixture for sample digestion and the bias from spectral interferences on the different titanium isotopes, were investigated. Resolution of interferences was achieved by ICP-MS/MS with ammonia adduct formation and viable conditions for control laboratories equipped with standard quadrupole instruments were identified. The method was successfully validated and enables rapid screening of samples subject to confirmatory analysis for the presence of TiO2 particles. For the latter, single-particle ICP-MS (spICP-MS) analysis after chemical extraction of the particles was used. The two methods establish a viable analytical strategy for assessing the absence of titania particles in food products on the EU market following the E 171 ban as a food additive.
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Affiliation(s)
- Francesca Ferraris
- National Reference Laboratory for Nanomaterials in Food, Department of Food Safety, Nutrition and Veterinary Public Health, Istituto Superiore di Sanità—National Institute of Health, 00161 Rome, Italy; (F.F.); (A.R.); (S.S.)
| | - Carlos Adelantado
- Flemish Institute for Technological Research (VITO), 2400 Mol, Belgium;
| | - Andrea Raggi
- National Reference Laboratory for Nanomaterials in Food, Department of Food Safety, Nutrition and Veterinary Public Health, Istituto Superiore di Sanità—National Institute of Health, 00161 Rome, Italy; (F.F.); (A.R.); (S.S.)
| | - Sara Savini
- National Reference Laboratory for Nanomaterials in Food, Department of Food Safety, Nutrition and Veterinary Public Health, Istituto Superiore di Sanità—National Institute of Health, 00161 Rome, Italy; (F.F.); (A.R.); (S.S.)
| | - Mohammed Zougagh
- Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, 13071 Ciudad Real, Spain; (M.Z.); (Á.R.)
- Regional Institute for Applied Scientific Research, IRICA, 13005 Ciudad Real, Spain
| | - Ángel Ríos
- Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, 13071 Ciudad Real, Spain; (M.Z.); (Á.R.)
- Regional Institute for Applied Scientific Research, IRICA, 13005 Ciudad Real, Spain
| | - Francesco Cubadda
- National Reference Laboratory for Nanomaterials in Food, Department of Food Safety, Nutrition and Veterinary Public Health, Istituto Superiore di Sanità—National Institute of Health, 00161 Rome, Italy; (F.F.); (A.R.); (S.S.)
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4
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Loeschner K, Johnson ME, Montoro Bustos AR. Application of Single Particle ICP-MS for the Determination of Inorganic Nanoparticles in Food Additives and Food: A Short Review. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2547. [PMID: 37764576 PMCID: PMC10536347 DOI: 10.3390/nano13182547] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 09/06/2023] [Accepted: 09/08/2023] [Indexed: 09/29/2023]
Abstract
Due to enhanced properties at the nanoscale, nanomaterials (NMs) have been incorporated into foods, food additives, and food packaging materials. Knowledge gaps related to (but not limited to) fate, transport, bioaccumulation, and toxicity of nanomaterials have led to an expedient need to expand research efforts in the food research field. While classical techniques can provide information on dilute suspensions, these techniques sample a low throughput of nanoparticles (NPs) in the suspension and are limited in the range of the measurement metrics so orthogonal techniques must be used in tandem to fill in measurement gaps. New and innovative characterization techniques have been developed and optimized for employment in food nano-characterization. Single particle inductively coupled plasma mass spectrometry, a high-throughput nanoparticle characterization technique capable of providing vital measurands of NP-containing samples such as size distribution, number concentration, and NP evolution has been employed as a characterization technique in food research since its inception. Here, we offer a short, critical review highlighting existing studies that employ spICP-MS in food research with a particular focus on method validation and trends in sample preparation and spICP-MS methodology. Importantly, we identify and address areas in research as well as offer insights into yet to be addressed knowledge gaps in methodology.
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Affiliation(s)
- Katrin Loeschner
- Research Group for Analytical Food Chemistry, National Food Institute, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Monique E. Johnson
- Material Measurement Laboratory, Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA; (M.E.J.); (A.R.M.B.)
| | - Antonio R. Montoro Bustos
- Material Measurement Laboratory, Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA; (M.E.J.); (A.R.M.B.)
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Evariste L, Lamas B, Ellero-Simatos S, Khoury L, Cartier C, Gaultier E, Chassaing B, Feltin N, Devoille L, Favre G, Audebert M, Houdeau E. A 90-day oral exposure to food-grade gold at relevant human doses impacts the gut microbiota and the local immune system in a sex-dependent manner in mice. Part Fibre Toxicol 2023; 20:27. [PMID: 37443115 DOI: 10.1186/s12989-023-00539-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 07/06/2023] [Indexed: 07/15/2023] Open
Abstract
BACKGROUND Edible gold (Au) is commonly used as a food additive (E175 in EU) for confectionery and cake decorations, coatings and in beverages. Food-grade gold is most often composed of thin Au sheets or flakes exhibiting micro- and nanometric dimensions in their thickness. Concerns about the impact of mineral particles used as food additives on human health are increasing with respect to the particular physico-chemical properties of nanosized particles, which enable them to cross biological barriers and interact with various body cell compartments. In this study, male and female mice were exposed daily to E175 or an Au nanomaterial (Ref-Au) incorporated into food at relevant human dose for 90 days in order to determine the potential toxicity of edible gold. RESULTS E175 or Ref-Au exposure in mice did not induce any histomorphological damage of the liver, spleen or intestine, nor any genotoxic effects in the colon and liver despite an apparent higher intestinal absorption level of Au particles in mice exposed to Ref-Au compared to the E175 food additive. No changes in the intestinal microbiota were reported after treatment with Ref-Au, regardless of sex. In contrast, after E175 exposure, an increase in the Firmicutes/Bacteroidetes ratio and in the abundance of Proteobacteria were observed in females, while a decrease in the production of short-chain fatty acids occurred in both sexes. Moreover, increased production of IL-6, TNFα and IL-1β was observed in the colon of female mice at the end of the 90-day exposure to E175, whereas, decreased IL-6, IL-1β, IL-17 and TGFβ levels were found in the male colon. CONCLUSIONS These results revealed that a 90-day exposure to E175 added to the diet alters the gut microbiota and intestinal immune response in a sex-dependent manner in mice. Within the dose range of human exposure to E175, these alterations remained low in both sexes and mostly appeared to be nontoxic. However, at the higher dose, the observed gut dysbiosis and the intestinal low-grade inflammation in female mice could favour the occurrence of metabolic disorders supporting the establishment of toxic reference values for the safe use of gold as food additive.
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Affiliation(s)
- Lauris Evariste
- Toxalim UMR1331 (Research Centre in Food Toxicology), Toulouse University, INRAE, ENVT, INP-Purpan, UPS, Toulouse, France
| | - Bruno Lamas
- Toxalim UMR1331 (Research Centre in Food Toxicology), Toulouse University, INRAE, ENVT, INP-Purpan, UPS, Toulouse, France
| | - Sandrine Ellero-Simatos
- Toxalim UMR1331 (Research Centre in Food Toxicology), Toulouse University, INRAE, ENVT, INP-Purpan, UPS, Toulouse, France
| | | | - Christel Cartier
- Toxalim UMR1331 (Research Centre in Food Toxicology), Toulouse University, INRAE, ENVT, INP-Purpan, UPS, Toulouse, France
| | - Eric Gaultier
- Toxalim UMR1331 (Research Centre in Food Toxicology), Toulouse University, INRAE, ENVT, INP-Purpan, UPS, Toulouse, France
| | - Benoit Chassaing
- INSERM U1016, Team "Mucosal Microbiota in Chronic Inflammatory Diseases", CNRS UMR 8104, Université de Paris, Paris, France
| | | | | | | | - Marc Audebert
- Toxalim UMR1331 (Research Centre in Food Toxicology), Toulouse University, INRAE, ENVT, INP-Purpan, UPS, Toulouse, France
- PrediTox, Toulouse, France
| | - Eric Houdeau
- Toxalim UMR1331 (Research Centre in Food Toxicology), Toulouse University, INRAE, ENVT, INP-Purpan, UPS, Toulouse, France.
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6
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Ferraris F, Raggi A, Ponti J, Mehn D, Gilliland D, Savini S, Iacoponi F, Aureli F, Calzolai L, Cubadda F. Agglomeration Behavior and Fate of Food-Grade Titanium Dioxide in Human Gastrointestinal Digestion and in the Lysosomal Environment. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1908. [PMID: 37446425 DOI: 10.3390/nano13131908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 06/13/2023] [Accepted: 06/21/2023] [Indexed: 07/15/2023]
Abstract
In the present study, we addressed the knowledge gaps regarding the agglomeration behavior and fate of food-grade titanium dioxide (E 171) in human gastrointestinal digestion (GID). After thorough multi-technique physicochemical characterization including TEM, single-particle ICP-MS (spICP-MS), CLS, VSSA determination and ELS, the GI fate of E 171 was studied by applying the in vitro GID approach established for the regulatory risk assessment of nanomaterials in Europe, using a standardized international protocol. GI fate was investigated in fasted conditions, relevant to E 171 use in food supplements and medicines, and in fed conditions, with both a model food and E 171-containing food samples. TiO2 constituent particles were resistant to GI dissolution, and thus, their stability in lysosomal fluid was investigated. The biopersistence of the material in lysosomal fluid highlighted its potential for bioaccumulation. For characterizing the agglomeration degree in the small intestinal phase, spICP-MS represented an ideal analytical tool to overcome the limitations of earlier studies. We demonstrated that, after simulated GID, in the small intestine, E 171 (at concentrations reflecting human exposure) is present with a dispersion degree similar to that obtained when dispersing the material in water by means of high-energy sonication (i.e., ≥70% of particles <250 nm).
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Affiliation(s)
- Francesca Ferraris
- Istituto Superiore di Sanità-National Institute of Health, 00161 Rome, Italy
| | - Andrea Raggi
- Istituto Superiore di Sanità-National Institute of Health, 00161 Rome, Italy
| | - Jessica Ponti
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
| | - Dora Mehn
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
| | - Douglas Gilliland
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
| | - Sara Savini
- Istituto Superiore di Sanità-National Institute of Health, 00161 Rome, Italy
| | - Francesca Iacoponi
- Istituto Superiore di Sanità-National Institute of Health, 00161 Rome, Italy
| | - Federica Aureli
- Istituto Superiore di Sanità-National Institute of Health, 00161 Rome, Italy
| | - Luigi Calzolai
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
| | - Francesco Cubadda
- Istituto Superiore di Sanità-National Institute of Health, 00161 Rome, Italy
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7
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Bischoff NS, Proquin H, Jetten MJ, Schrooders Y, Jonkhout MCM, Briedé JJ, van Breda SG, Jennen DGJ, Medina-Reyes EI, Delgado-Buenrostro NL, Chirino YI, van Loveren H, de Kok TM. Reply to Kaminski, N.E.; Cohen, S.M. Comment on "Bischoff et al. The Effects of the Food Additive Titanium Dioxide (E171) on Tumor Formation and Gene Expression in the Colon of a Transgenic Mouse Model for Colorectal Cancer. Nanomaterials 2022, 12, 1256". NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13091552. [PMID: 37177098 PMCID: PMC10180508 DOI: 10.3390/nano13091552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 04/03/2023] [Accepted: 04/26/2023] [Indexed: 05/15/2023]
Abstract
We appreciate the interest in our article describing transcriptome changes in a transgenic mouse model carrying an APC gene mutation and would like to reply to the reader [...].
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Affiliation(s)
- Nicolaj S Bischoff
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands
| | - Héloïse Proquin
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands
- National Institute for Public Health and Environment (RIVM), 3721 MA Bilthoven, The Netherlands
| | - Marlon J Jetten
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands
- Faculty of Health, Medicine and Life Science, Maastricht University Medical Center, 6229 ES Maastricht, The Netherlands
| | - Yannick Schrooders
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands
| | - Marloes C M Jonkhout
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands
- Laboratory of Biosignaling & Therapeutics, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
| | - Jacco J Briedé
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands
| | - Simone G van Breda
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands
| | - Danyel G J Jennen
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands
| | - Estefany I Medina-Reyes
- Laboratorio de Carcinogénesis y Toxicología, Unidad de Biomedicina, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Mexico City 54090, Mexico
| | - Norma L Delgado-Buenrostro
- Laboratorio de Carcinogénesis y Toxicología, Unidad de Biomedicina, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Mexico City 54090, Mexico
| | - Yolanda I Chirino
- Laboratorio de Carcinogénesis y Toxicología, Unidad de Biomedicina, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Mexico City 54090, Mexico
| | - Henk van Loveren
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands
| | - Theo M de Kok
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands
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8
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Bietto F, Scardaci R, Brovia M, Kokalari I, Barbero F, Fenoglio I, Pessione E. Food-grade titanium dioxide can affect microbiota physiology, adhesion capability, and interbacterial interactions: A study onL. rhamnosus and E. faecium. Food Chem Toxicol 2023; 176:113760. [PMID: 37028743 DOI: 10.1016/j.fct.2023.113760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 03/25/2023] [Accepted: 03/30/2023] [Indexed: 04/08/2023]
Abstract
Food-grade titanium dioxide (TiO2-FG) is a widespread metal oxide used in the food industries. Recently, the European Food Safety Authority concluded that TiO2-FG cannot be considered safe for consumption due to its genotoxicity; however, its effect on the gut microbiota has not yet been completely unraveled. We studied the effects of TiO2-FG (0.125 mg/mL) on Lactobacillus rhamnosus GG (LGG) and Enterococcus faecium NCIMB10415 (Ent), in particular some physiological and phenotypic traits (growth kinetics, bile salts, and ampicillin resistance) and their interactions with the host (auto-aggregation, biofilm formation, and adhesion on Caco-2/TC7 monolayers) and other gut microorganisms (antimicrobial activity towards pathogens). The results obtained revealed that TiO2-FG alters both LGG and Ent growth and lowers bile resistance (62 and 34.5%, respectively) and adhesion on Caco-2/TC7 monolayers (34.8 and 14.16%, respectively). The other outcomes were strictly species-specific: Ent showed a lower ampicillin sensitivity (14.48%) and auto-aggregation (38.1%), while LGG showed a reduced biofilm formation (37%) and antimicrobial activity towards Staphylococcus aureus (35.73%). Overall, these results suggest an adverse effect of TiO2-FG on both the endogenous and exogenously administered probiotics, contributing to the argument against using TiO2-FG as a food additive.
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Affiliation(s)
- F Bietto
- Laboratory of Microbial Biochemistry and Proteomics, Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Torino, Italy.
| | - R Scardaci
- Laboratory of Microbial Biochemistry and Proteomics, Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Torino, Italy.
| | - M Brovia
- Laboratory of Microbial Biochemistry and Proteomics, Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Torino, Italy.
| | - I Kokalari
- Department of Chemistry, University of Turin, via P. Giuria 7, 10125, Torino, Italy.
| | - F Barbero
- Department of Chemistry, University of Turin, via P. Giuria 7, 10125, Torino, Italy.
| | - I Fenoglio
- Department of Chemistry, University of Turin, via P. Giuria 7, 10125, Torino, Italy.
| | - E Pessione
- Laboratory of Microbial Biochemistry and Proteomics, Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Torino, Italy.
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9
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Lin H, Tan J, Wang J, Xie C, Chen B, Luo M, Liu Y, Liao W, Huang W, Wang H, Jiang Y, Wang K, Lu C, Zhao M. Subchronic Oral Toxicity Study of Food-Related Titanium Dioxide Nanoparticles in Rats Involved in Ti Biodistribution and Gut Microbiota. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:1713-1726. [PMID: 36634352 DOI: 10.1021/acs.jafc.2c05341] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The widespread use of titanium dioxide nanoparticles (TiO2 NPs) in the food industry has brought about human safety risks related to nanotoxicity. In this study, food-related TiO2 NPs (anatase, 40 nm) were given to rats by oral gavage for 90 days at doses of 10, 100, and 1000 mg/kg bw. An additional two satellite groups underwent the same protocol for 45 days and for 90 days followed by a 28 day recovery. TiO2 NPs tended to agglomerate together in H2O, AGJ, and AIJ. No systemic toxicity was observed after 90 day agglomerated TiO2 NP exposure with no Ti distribution in major tissues/organs. Furthermore, TiO2 NP consumption for 90 days had no impact on microbiota diversity; the community structure of the gut microbiota is shifted to some extent at the genus level. Collectively, the NOAEL of agglomerated TiO2 NPs for 90 days of oral administration was 1000 mg/kg bw, the highest dose tested in male and female rats.
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Affiliation(s)
- Hong Lin
- Department of Medical statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
- Institute of Toxicology, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Jianbin Tan
- Institute of Toxicology, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Jing Wang
- Institute of Public Health Service Testing, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Chengliang Xie
- School of Pharmaceutical Science (Shenzhen), Sun Yat-Sen University, Guangzhou 518107, China
| | - Bifeng Chen
- Institute of Toxicology, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Mansi Luo
- Institute of Toxicology, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Yun Liu
- Institute of Toxicology, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Wenzhen Liao
- Department of Nutrition and Food Hygiene, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Weiling Huang
- Institute of Toxicology, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Hongxia Wang
- Institute of Toxicology, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Ying Jiang
- Institute of Toxicology, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Kexin Wang
- Institute of Toxicology, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Ciyong Lu
- Department of Medical statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Min Zhao
- Institute of Toxicology, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
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10
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Characterisation of iron oxide-containing pearlescent pigments used as food colourants: nano-labelling required in the EU? Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2022; 39:1933-1941. [PMID: 36305852 DOI: 10.1080/19440049.2022.2134592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Pearlescent pigments are used as colourants to increase the attractiveness of food products, especially in the patisserie and confectionery sector. They can be seen as composite materials and consist of thin potassium aluminium silicate (E 555, mica) platelets as carrier material, coated with a thin metal oxide layer of TiO2 (E 171) and/or iron oxides (E 172). The European Food Safety Authority stated in 2020 that mica-based pearlescent pigments as a whole should be evaluated as new food additives. Obtaining dependable data for particle size and layer thickness of these pigments is crucial both for the demanded food additive evaluation itself and also for the nanomaterial labelling assessment of products containing these food colourants according to the 'Food Information to Consumers' regulation. Since it was found in a previous study on TiO2-containing pearlescent pigments (silver and golden coloured) that the coating consisted of nanoscaled constituent titanium oxide particles, in this follow-up study we investigated whether Fe2O3-containing pearlescent pigments exhibit a similar nanostructured morphology. For this purpose, five commercially-available food products containing these pigments were investigated. Static light scattering and flow particle image analysis were used as screening methods to determine the mica platelet size. Scanning electron microscopy combined with energy-dispersive X-ray spectroscopy was used for nanostructure analysis of the metal oxide coating. The carrier mica platelets were 34-96 µm in diameter and 300-800 nm thick. The coating thickness was found to be in the range of 75-105 nm, with the constituent round shaped iron oxide particles contained therein having a minimum Feret diameter of 37-64 nm.
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Ammendolia MG, De Berardis B. Nanoparticle Impact on the Bacterial Adaptation: Focus on Nano-Titania. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3616. [PMID: 36296806 PMCID: PMC9609019 DOI: 10.3390/nano12203616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 09/29/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
Titanium dioxide nanoparticles (nano-titania/TiO2 NPs) are used in different fields and applications. However, the release of TiO2 NPs into the environment has raised concerns about their biosafety and biosecurity. In light of the evidence that TiO2 NPs could be used to counteract antibiotic resistance, they have been investigated for their antibacterial activity. Studies reported so far indicate a good performance of TiO2 NPs against bacteria, alone or in combination with antibiotics. However, bacteria are able to invoke multiple response mechanisms in an attempt to adapt to TiO2 NPs. Bacterial adaption arises from global changes in metabolic pathways via the modulation of regulatory networks and can be related to single-cell or multicellular communities. This review describes how the impact of TiO2 NPs on bacteria leads to several changes in microorganisms, mainly during long-term exposure, that can evolve towards adaptation and/or increased virulence. Strategies employed by bacteria to cope with TiO2 NPs suggest that their use as an antibacterial agent has still to be extensively investigated from the point of view of the risk of adaptation, to prevent the development of resistance. At the same time, possible effects on increased virulence following bacterial target modifications by TiO2 NPs on cells or tissues have to be considered.
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12
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Qu Z, Zhou J, Guo P, Wang J, Wang P, Liu L, Wu M, Wang P, Liu N. Association between environmental lead/cadmium co-exposure in drinking water and soil and type 2 diabetes mellitus/obesity in Southern China. Front Public Health 2022; 10:941922. [PMID: 36159247 PMCID: PMC9489910 DOI: 10.3389/fpubh.2022.941922] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 08/19/2022] [Indexed: 01/25/2023] Open
Abstract
Lead (Pb) and cadmium (Cd) in environment can be directly absorbed by drinking water and soil. However, data on human Pb and Cd exposure by drinking water and soil and its long-term consequence for type 2 diabetes mellitus (T2DM) and obesity are lacking. Our study aims to explore the association of typical heavy metals co-exposure in drinking water and soil to the community residents with T2DM and obesity indices in two cities of southern China. A cross-sectional study enrolling total 1,274 participants was performed and the local water and soil samples were collected in two communities in southern China. The average daily dose (ADD) of heavy metals was calculated to assess the exposure. The obesity indices comprise body mass index (BMI), waist-to-hip ratio (WHR) and waist circumference (WC). Binary, multiple logistic and linear regressions were employed for assessing the associations of Pb and Cd exposure with T2DM and obesity. The results showed that there weren't any significant correlations between ADDs of Pb/Cd and T2DM in community residents (all Ps>0.05). Compared with those with 18.5 ≤ BMI <24, with 1 μg/kg bw/d ADD of Pb increase in exposure are associated with 49.2-56.1% lower likelihood of overweight. Besides, with ADDs of Pb exposure was increased by 1 μg/kg bw/d and WHR decreasing by 0.01-0.02, and WC decreasing by 2.22-4.67 cm. We speculate that Pb causes weight loss because it damages the absorption function of the gastrointestinal tract as an initial injury. 1μg/kg bw/d ADD of Cd increase is associated with 100.9% upper likelihood of low weight in Model 1. It suggests that Pb/Cd pollution in the local environment was serious and harmful to residents' health. Government should introduce relevant oversight and accountability systems to improve the prevention and management of lifestyle-related chronic diseases in the future.
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Affiliation(s)
- Zhi Qu
- School of Nursing, Institute of Chronic Disease Risks Assessment, Henan University, Kaifeng, China,Health Science Center, Institute of Environment and Health, South China Hospital, Shenzhen University, Shenzhen, China
| | - Jianli Zhou
- School of Nursing, Institute of Chronic Disease Risks Assessment, Henan University, Kaifeng, China,Health Science Center, Institute of Environment and Health, South China Hospital, Shenzhen University, Shenzhen, China
| | - Peisen Guo
- Health Science Center, Institute of Environment and Health, South China Hospital, Shenzhen University, Shenzhen, China,College of Public Health, Zhengzhou University, Zhengzhou, China
| | - Jingrui Wang
- School of Nursing, Institute of Chronic Disease Risks Assessment, Henan University, Kaifeng, China
| | - Panpan Wang
- Health Science Center, Institute of Environment and Health, South China Hospital, Shenzhen University, Shenzhen, China,College of Public Health, Zhengzhou University, Zhengzhou, China
| | - Limin Liu
- Health Science Center, Institute of Environment and Health, South China Hospital, Shenzhen University, Shenzhen, China,College of Public Health, Zhengzhou University, Zhengzhou, China
| | - Mengdi Wu
- Health Science Center, Institute of Environment and Health, South China Hospital, Shenzhen University, Shenzhen, China,College of Public Health, Zhengzhou University, Zhengzhou, China
| | - Peixi Wang
- School of Nursing, Institute of Chronic Disease Risks Assessment, Henan University, Kaifeng, China,*Correspondence: Peixi Wang
| | - Nan Liu
- School of Nursing, Institute of Chronic Disease Risks Assessment, Henan University, Kaifeng, China,Health Science Center, Institute of Environment and Health, South China Hospital, Shenzhen University, Shenzhen, China,College of Public Health, Zhengzhou University, Zhengzhou, China,Nan Liu
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Guiot F, Praud C, Quillard S, Humbert B, Ropers MH, Paris M, Terrisse H. Surface reactivity of anatase particles towards phosphated species. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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14
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How to trust size distributions obtained by single particle inductively coupled plasma mass spectrometry analysis. Anal Bioanal Chem 2022; 415:2101-2112. [PMID: 35906343 PMCID: PMC10079697 DOI: 10.1007/s00216-022-04215-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 06/09/2022] [Accepted: 07/04/2022] [Indexed: 11/01/2022]
Abstract
Single particle inductively coupled plasma mass spectrometry (SP-ICP-MS) is a technique widely used to obtain direct information about the number concentration and the size distribution of nanoparticles in liquid suspensions. However, its methods still lack clear quality control strategies to confirm the validity of the information derived from them. Only the detection of the complete size distribution of the nanoparticles in a sample over the size critical value ensures obtaining unbiased quantitative information, otherwise information should be restricted to report the presence of nanoparticles over a certain size and number concentration since their actual total number concentration is underestimated and the size overestimated. Under the latter conditions, data processing produces histograms showing the tails of the incomplete size distributions, although apparently, complete distributions can also be obtained when particle events are recorded as peaks, as reported here for the first time. The occurrence of these misleading situations must be critically evaluated for each SP-ICP-MS analysis. An approach, based on estimation of size critical values and successive dilutions, is proposed for the assessment of the validity of the quantitative information obtained, together with specific criteria for reconsidering the information that can be derived from those measurements. The approach was verified with different case studies and applied to the analysis of complex nanomaterials, confirming the validity of the reported information by comparison with other techniques. A calculation tool is also included to facilitate the estimation of size critical values under experimental conditions.
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Bischoff NS, Proquin H, Jetten MJ, Schrooders Y, Jonkhout MCM, Briedé JJ, van Breda SG, Jennen DGJ, Medina-Reyes EI, Delgado-Buenrostro NL, Chirino YI, van Loveren H, de Kok TM. The Effects of the Food Additive Titanium Dioxide (E171) on Tumor Formation and Gene Expression in the Colon of a Transgenic Mouse Model for Colorectal Cancer. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:1256. [PMID: 35457963 PMCID: PMC9027218 DOI: 10.3390/nano12081256] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 03/28/2022] [Accepted: 04/05/2022] [Indexed: 11/16/2022]
Abstract
Titanium dioxide (TiO2) is present in many different food products as the food additive E171, which is currently scrutinized due to its potential adverse effects, including the stimulation of tumor formation in the gastrointestinal tract. We developed a transgenic mouse model to examine the effects of E171 on colorectal cancer (CRC), using the Cre-LoxP system to create an Apc-gene-knockout model which spontaneously develops colorectal tumors. A pilot study showed that E171 exposed mice developed colorectal adenocarcinomas, which were accompanied by enhanced hyperplasia in epithelial cells, lymphatic nodules at the base of the polyps, and increased tumor size. In the main study, tumor formation was studied following the exposure to 5 mg/kgbw/day of E171 for 9 weeks (Phase I). E171 exposure showed a statistically nonsignificant increase in the number of colorectal tumors in these transgenic mice, as well as a statistically nonsignificant increase in the average number of mice with tumors. Gene expression changes in the colon were analyzed after exposure to 1, 2, and 5 mg/kgbw/day of E171 for 2, 7, 14, and 21 days (Phase II). Whole-genome mRNA analysis revealed the modulation of genes in pathways involved in the regulation of gene expression, cell cycle, post-translational modification, nuclear receptor signaling, and circadian rhythm. The processes associated with these genes might be involved in the enhanced tumor formation and suggest that E171 may contribute to tumor formation and progression by modulation of events related to inflammation, activation of immune responses, cell cycle, and cancer signaling.
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Affiliation(s)
- Nicolaj S. Bischoff
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands; (H.P.); (M.J.J.); (Y.S.); (M.C.M.J.); (J.J.B.); (S.G.v.B.); (D.G.J.J.); (H.v.L.); (T.M.d.K.)
| | - Héloïse Proquin
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands; (H.P.); (M.J.J.); (Y.S.); (M.C.M.J.); (J.J.B.); (S.G.v.B.); (D.G.J.J.); (H.v.L.); (T.M.d.K.)
- National Institute for Public Health and Environment (RIVM), Bilthoven, 3721 MA De Bilt, The Netherlands
| | - Marlon J. Jetten
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands; (H.P.); (M.J.J.); (Y.S.); (M.C.M.J.); (J.J.B.); (S.G.v.B.); (D.G.J.J.); (H.v.L.); (T.M.d.K.)
- Faculty of Health, Medicine and Life Science, Maastricht University Medical Center, 6229 ES Maastricht, The Netherlands
| | - Yannick Schrooders
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands; (H.P.); (M.J.J.); (Y.S.); (M.C.M.J.); (J.J.B.); (S.G.v.B.); (D.G.J.J.); (H.v.L.); (T.M.d.K.)
- Laboratory of Biosignaling & Therapeutics, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
| | - Marloes C. M. Jonkhout
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands; (H.P.); (M.J.J.); (Y.S.); (M.C.M.J.); (J.J.B.); (S.G.v.B.); (D.G.J.J.); (H.v.L.); (T.M.d.K.)
- Laboratory of Biosignaling & Therapeutics, Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
| | - Jacco J. Briedé
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands; (H.P.); (M.J.J.); (Y.S.); (M.C.M.J.); (J.J.B.); (S.G.v.B.); (D.G.J.J.); (H.v.L.); (T.M.d.K.)
| | - Simone G. van Breda
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands; (H.P.); (M.J.J.); (Y.S.); (M.C.M.J.); (J.J.B.); (S.G.v.B.); (D.G.J.J.); (H.v.L.); (T.M.d.K.)
| | - Danyel G. J. Jennen
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands; (H.P.); (M.J.J.); (Y.S.); (M.C.M.J.); (J.J.B.); (S.G.v.B.); (D.G.J.J.); (H.v.L.); (T.M.d.K.)
| | - Estefany I. Medina-Reyes
- Laboratorio de Carcinogénesis y Toxicología, Unidad de Biomedicina, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Mexico City 54090, Mexico; (E.I.M.-R.); (N.L.D.-B.); (Y.I.C.)
| | - Norma L. Delgado-Buenrostro
- Laboratorio de Carcinogénesis y Toxicología, Unidad de Biomedicina, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Mexico City 54090, Mexico; (E.I.M.-R.); (N.L.D.-B.); (Y.I.C.)
| | - Yolanda I. Chirino
- Laboratorio de Carcinogénesis y Toxicología, Unidad de Biomedicina, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Mexico City 54090, Mexico; (E.I.M.-R.); (N.L.D.-B.); (Y.I.C.)
| | - Henk van Loveren
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands; (H.P.); (M.J.J.); (Y.S.); (M.C.M.J.); (J.J.B.); (S.G.v.B.); (D.G.J.J.); (H.v.L.); (T.M.d.K.)
| | - Theo M. de Kok
- Department of Toxicogenomics, GROW School for Oncology and Reproduction, Maastricht University Medical Center, 6229 ER Maastricht, The Netherlands; (H.P.); (M.J.J.); (Y.S.); (M.C.M.J.); (J.J.B.); (S.G.v.B.); (D.G.J.J.); (H.v.L.); (T.M.d.K.)
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Verleysen E, Ledecq M, Siciliani L, Cheyns K, Vleminckx C, Blaude MN, De Vos S, Brassinne F, Van Steen F, Nkenda R, Machiels R, Waegeneers N, Van Loco J, Mast J. Titanium dioxide particles frequently present in face masks intended for general use require regulatory control. Sci Rep 2022; 12:2529. [PMID: 35169246 PMCID: PMC8847427 DOI: 10.1038/s41598-022-06605-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 02/01/2022] [Indexed: 11/09/2022] Open
Abstract
Although titanium dioxide (TiO2) is a suspected human carcinogen when inhaled, fiber-grade TiO2 (nano)particles were demonstrated in synthetic textile fibers of face masks intended for the general public. STEM-EDX analysis on sections of a variety of single use and reusable face masks visualized agglomerated near-spherical TiO2 particles in non-woven fabrics, polyester, polyamide and bi-component fibers. Median sizes of constituent particles ranged from 89 to 184 nm, implying an important fraction of nano-sized particles (< 100 nm). The total TiO2 mass determined by ICP-OES ranged from 791 to 152,345 µg per mask. The estimated TiO2 mass at the fiber surface ranged from 17 to 4394 µg, and systematically exceeded the acceptable exposure level to TiO2 by inhalation (3.6 µg), determined based on a scenario where face masks are worn intensively. No assumptions were made about the likelihood of the release of TiO2 particles itself, since direct measurement of release and inhalation uptake when face masks are worn could not be assessed. The importance of wearing face masks against COVID-19 is unquestionable. Even so, these results urge for in depth research of (nano)technology applications in textiles to avoid possible future consequences caused by a poorly regulated use and to implement regulatory standards phasing out or limiting the amount of TiO2 particles, following the safe-by-design principle.
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Affiliation(s)
- Eveline Verleysen
- Trace Elements and Nanomaterials, Sciensano, Groeselenbergstraat 99, 1180, Uccle, Belgium
| | - Marina Ledecq
- Trace Elements and Nanomaterials, Sciensano, Groeselenbergstraat 99, 1180, Uccle, Belgium
| | - Lisa Siciliani
- Trace Elements and Nanomaterials, Sciensano, Groeselenbergstraat 99, 1180, Uccle, Belgium
| | - Karlien Cheyns
- Trace Elements and Nanomaterials, Sciensano, Leuvensesteenweg 17, 3080, Tervuren, Belgium
| | - Christiane Vleminckx
- Service Risk and Health Impact Assessment, Sciensano, Juliette Wytsmanstraat 14, 1050, Brussels, Belgium
| | - Marie-Noelle Blaude
- Service Risk and Health Impact Assessment, Sciensano, Juliette Wytsmanstraat 14, 1050, Brussels, Belgium
| | - Sandra De Vos
- Trace Elements and Nanomaterials, Sciensano, Groeselenbergstraat 99, 1180, Uccle, Belgium
| | - Frédéric Brassinne
- Trace Elements and Nanomaterials, Sciensano, Groeselenbergstraat 99, 1180, Uccle, Belgium
| | - Frederic Van Steen
- Trace Elements and Nanomaterials, Sciensano, Groeselenbergstraat 99, 1180, Uccle, Belgium
| | - Régis Nkenda
- Trace Elements and Nanomaterials, Sciensano, Leuvensesteenweg 17, 3080, Tervuren, Belgium
| | - Ronny Machiels
- Trace Elements and Nanomaterials, Sciensano, Leuvensesteenweg 17, 3080, Tervuren, Belgium
| | - Nadia Waegeneers
- Trace Elements and Nanomaterials, Sciensano, Leuvensesteenweg 17, 3080, Tervuren, Belgium.,Service Risk and Health Impact Assessment, Sciensano, Juliette Wytsmanstraat 14, 1050, Brussels, Belgium
| | - Joris Van Loco
- Trace Elements and Nanomaterials, Sciensano, Groeselenbergstraat 99, 1180, Uccle, Belgium.,Trace Elements and Nanomaterials, Sciensano, Leuvensesteenweg 17, 3080, Tervuren, Belgium.,Service Risk and Health Impact Assessment, Sciensano, Juliette Wytsmanstraat 14, 1050, Brussels, Belgium
| | - Jan Mast
- Trace Elements and Nanomaterials, Sciensano, Groeselenbergstraat 99, 1180, Uccle, Belgium. .,Trace Elements and Nanomaterials, Sciensano, Leuvensesteenweg 17, 3080, Tervuren, Belgium.
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de Oliveira Mallia J, Galea R, Nag R, Cummins E, Gatt R, Valdramidis V. Nanoparticle Food Applications and Their Toxicity: Current Trends and Needs in Risk Assessment Strategies. J Food Prot 2022; 85:355-372. [PMID: 34614149 DOI: 10.4315/jfp-21-184] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 10/05/2021] [Indexed: 11/11/2022]
Abstract
ABSTRACT Nanotechnology has developed into one of the most groundbreaking scientific fields in the last few decades because it exploits the enhanced reactivity of materials at the atomic scale. The current classification of nanoparticles (NPs) used in foods is outlined in relation to the production and physicochemical characteristics. This review aims to concisely present the most popular and widely used inorganic and organic NPs in food industries. Considering that the toxicity of NPs is often associated with chemical reactivity, a series of in vitro toxicity studies are also summarized, integrating information on the type of NP studies and reported specifications, type of cells used, exposure conditions, and assessed end points. The important role of the digestive system in the absorption and distribution of nanoformulated foods within the body and how this affects the resultant cytotoxicity. Examples of how NPs and their accumulation within different organs are presented in relation to the consumption of specific foods. Finally, the role of developing human health risk assessments to characterize both the potential impact of the hazard and the likelihood or level of human exposure is outlined. Uncertainties exist around risk and exposure assessments of NPs due to limited information on several aspects, including toxicity, behavior, and bioaccumulation. Overall, this review presents current trends and needs for future assessments in toxicity evaluation to ensure the safe application of NPs in the food industry. HIGHLIGHTS
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Affiliation(s)
- Jefferson de Oliveira Mallia
- Department of Food Sciences and Nutrition, Faculty of Health Sciences, University College Dublin, Belfield, Dublin 4, Ireland.,Metamaterials Unit, Faculty of Science, University College Dublin, Belfield, Dublin 4, Ireland
| | - Russell Galea
- Metamaterials Unit, Faculty of Science, University College Dublin, Belfield, Dublin 4, Ireland
| | - Rajat Nag
- UCD School of Biosystems and Food Engineering, University College Dublin, Belfield, Dublin 4, Ireland
| | - Enda Cummins
- UCD School of Biosystems and Food Engineering, University College Dublin, Belfield, Dublin 4, Ireland
| | - Ruben Gatt
- Metamaterials Unit, Faculty of Science, University College Dublin, Belfield, Dublin 4, Ireland.,Centre for Molecular Medicine and Biobanking, University of Malta, Msida MSD2080, Malta; and
| | - Vasilis Valdramidis
- Department of Food Sciences and Nutrition, Faculty of Health Sciences, University College Dublin, Belfield, Dublin 4, Ireland.,Centre for Molecular Medicine and Biobanking, University of Malta, Msida MSD2080, Malta; and
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Verleysen E, Brassinne F, Van Steen F, Waegeneers N, Cheyns K, Machiels R, Mathioudaki S, Jimenez IO, Ledecq M, Mast J. Towards a generic protocol for measuring the constituent particle size distribution of E171 in food by electron microscopy. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108492] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Mortensen NP, Pathmasiri W, Snyder RW, Caffaro MM, Watson SL, Patel PR, Beeravalli L, Prattipati S, Aravamudhan S, Sumner SJ, Fennell TR. Oral administration of TiO 2 nanoparticles during early life impacts cardiac and neurobehavioral performance and metabolite profile in an age- and sex-related manner. Part Fibre Toxicol 2022; 19:3. [PMID: 34986857 PMCID: PMC8728993 DOI: 10.1186/s12989-021-00444-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 12/23/2021] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Nanoparticles (NPs) are increasingly incorporated in everyday products. To investigate the effects of early life exposure to orally ingested TiO2 NP, male and female Sprague-Dawley rat pups received four consecutive daily doses of 10 mg/kg body weight TiO2 NP (diameter: 21 ± 5 nm) or vehicle control (water) by gavage at three different pre-weaning ages: postnatal day (PND) 2-5, PND 7-10, or PND 17-20. Cardiac assessment and basic neurobehavioral tests (locomotor activity, rotarod, and acoustic startle) were conducted on PND 20. Pups were sacrificed at PND 21. Select tissues were collected, weighed, processed for neurotransmitter and metabolomics analyses. RESULTS Heart rate was found to be significantly decreased in female pups when dosed between PND 7-10 and PND 17-20. Females dosed between PND 2-5 showed decrease acoustic startle response and when dosed between PND 7-10 showed decreased performance in the rotarod test and increased locomotor activity. Male pups dosed between PND 17-20 showed decreased locomotor activity. The concentrations of neurotransmitters and related metabolites in brain tissue and the metabolomic profile of plasma were impacted by TiO2 NP administration for all dose groups. Metabolomic pathways perturbed by TiO2 NP administration included pathways involved in amino acid and lipid metabolism. CONCLUSION Oral administration of TiO2 NP to rat pups impacted basic cardiac and neurobehavioral performance, neurotransmitters and related metabolites concentrations in brain tissue, and the biochemical profiles of plasma. The findings suggested that female pups were more likely to experience adverse outcome following early life exposure to oral TiO2 NP than male pups. Collectively the data from this exploratory study suggest oral administration of TiO2 NP cause adverse biological effects in an age- and sex-related manner, emphasizing the need to understand the short- and long-term effects of early life exposure to TiO2 NP.
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Affiliation(s)
- Ninell P Mortensen
- Discovery Sciences, RTI International, 3040 E Cornwallis Road, Research Triangle Park, NC, 27709, USA.
| | - Wimal Pathmasiri
- UNC Nutrition Research Institute, The University of North Carolina at Chapel Hill, 500 Laureate Way, Kannapolis, NC, 28081, USA
| | - Rodney W Snyder
- Discovery Sciences, RTI International, 3040 E Cornwallis Road, Research Triangle Park, NC, 27709, USA
| | - Maria Moreno Caffaro
- Discovery Sciences, RTI International, 3040 E Cornwallis Road, Research Triangle Park, NC, 27709, USA
| | - Scott L Watson
- Discovery Sciences, RTI International, 3040 E Cornwallis Road, Research Triangle Park, NC, 27709, USA
| | - Purvi R Patel
- Discovery Sciences, RTI International, 3040 E Cornwallis Road, Research Triangle Park, NC, 27709, USA
| | - Lakshmi Beeravalli
- Joint School of Nanoscience and Nanoengineering, 2907 East Gate City Blvd., Greensboro, NC, 27401, USA
| | - Sharmista Prattipati
- Joint School of Nanoscience and Nanoengineering, 2907 East Gate City Blvd., Greensboro, NC, 27401, USA
| | - Shyam Aravamudhan
- Joint School of Nanoscience and Nanoengineering, 2907 East Gate City Blvd., Greensboro, NC, 27401, USA
| | - Susan J Sumner
- UNC Nutrition Research Institute, The University of North Carolina at Chapel Hill, 500 Laureate Way, Kannapolis, NC, 28081, USA
| | - Timothy R Fennell
- Discovery Sciences, RTI International, 3040 E Cornwallis Road, Research Triangle Park, NC, 27709, USA
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Vieira A, Gramacho A, Rolo D, Vital N, Silva MJ, Louro H. Cellular and Molecular Mechanisms of Toxicity of Ingested Titanium Dioxide Nanomaterials. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1357:225-257. [DOI: 10.1007/978-3-030-88071-2_10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
AbstractAn exponential increase in products containing titanium dioxide nanomaterials (TiO2), in agriculture, food and feed industry, lead to increased oral exposure to these nanomaterials (NMs). Thus, the gastrointestinal tract (GIT) emerges as a possible route of exposure that may drive systemic exposure, if the intestinal barrier is surpassed. NMs have been suggested to produce adverse outcomes, such as genotoxic effects, that are associated with increased risk of cancer, leading to a concern for public health. However, to date, the differences in the physicochemical characteristics of the NMs studied and other variables in the test systems have generated contradictory results in the literature. Processes like human digestion may change the NMs characteristics, inducing unexpected toxic effects in the intestine. Using TiO2 as case-study, this chapter provides a review of the works addressing the interactions of NMs with biological systems in the context of intestinal tract and digestion processes, at cellular and molecular level. The knowledge gaps identified suggest that the incorporation of a simulated digestion process for in vitro studies has the potential to improve the model for elucidating key events elicited by these NMs, advancing the nanosafety studies towards the development of an adverse outcome pathway for intestinal effects.
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21
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Epigenetic Mechanisms in Understanding Nanomaterial-Induced Toxicity. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1357:195-223. [DOI: 10.1007/978-3-030-88071-2_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Bouzakher-Ghomrasni N, Taché O, Leroy J, Feltin N, Testard F, Chivas-Joly C. Dimensional measurement of TiO 2 (Nano) particles by SAXS and SEM in powder form. Talanta 2021; 234:122619. [PMID: 34364428 DOI: 10.1016/j.talanta.2021.122619] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 06/11/2021] [Accepted: 06/12/2021] [Indexed: 11/28/2022]
Abstract
The market for nano-additive materials has been growing exponentially since 2012, with almost 5040 consumer products containing nanoparticles in 2021. In parallel, the increasing recommendations, definitions and legislations underline the need for traceability of manufactured nanoparticles and for methods able to identify and quantify the "nano" dimensional character in manufactured product. From a multi-technic approach, this paper aims to compare the mesurands extracted from SAXS/BET (specific surface area) and SEM (diameter equivalent to a projected surface area) on different TiO2 powder issued from referenced, synthesized materials, raw materials (additives) and extracted materials from manufactured products. The influence of various parameters such as the anisotropic factor, the interaction between particles, the size distribution and the extraction steps are discussed to illustrate their impact on the diameter values issued from two different measurands. These results illustrate the difficulties in (nano)particles characterization. SEM and SAXS are complementary techniques depending on the level of dimensional characterization required.
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Affiliation(s)
- Najoua Bouzakher-Ghomrasni
- Laboratoire National de Métrologie et D'Essais, Nanometrology, CARMEN Platform, 29 Avenue Hennequin, 78197, Trappes Cedex, France
| | - Olivier Taché
- Université Paris-Saclay, CEA, CNRS, NIMBE, 91191, Gif-sur-Yvette, France
| | - Jocelyne Leroy
- Université Paris-Saclay, CEA, CNRS, NIMBE, 91191, Gif-sur-Yvette, France
| | - Nicolas Feltin
- Laboratoire National de Métrologie et D'Essais, Nanometrology, CARMEN Platform, 29 Avenue Hennequin, 78197, Trappes Cedex, France
| | - Fabienne Testard
- Université Paris-Saclay, CEA, CNRS, NIMBE, 91191, Gif-sur-Yvette, France.
| | - Carine Chivas-Joly
- Laboratoire National de Métrologie et D'Essais, Nanometrology, CARMEN Platform, 29 Avenue Hennequin, 78197, Trappes Cedex, France.
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23
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Bredeck G, Kämpfer AAM, Sofranko A, Wahle T, Lison D, Ambroise J, Stahlmecke B, Albrecht C, Schins RPF. Effects of dietary exposure to the engineered nanomaterials CeO 2, SiO 2, Ag, and TiO 2 on the murine gut microbiome. Nanotoxicology 2021; 15:934-950. [PMID: 34380002 DOI: 10.1080/17435390.2021.1940339] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Rodent studies on the effects of engineered nanomaterials (ENM) on the gut microbiome have revealed contradictory results. Our aim was to assess the effects of four well-investigated model ENM using a realistic exposure scenario. Two independent ad libitum feeding studies were performed. In study 1, female mice from the local breeding facility received feed pellets containing 1% CeO2 or 1% SiO2 for three weeks. In study 2, both female and male mice were purchased and exposed to 0.2% Ag-PVP or 1% TiO2 for four weeks. A next generation 16S rDNA sequencing-based approach was applied to assess impacts on the gut microbiome. None of the ENM had an effect on the α- or β-diversity. A decreased relative abundance of the phylum Actinobacteria was observed in SiO2 exposed mice. In female mice, the relative abundance of the genus Roseburia was increased with Ag exposure. Furthermore, in study 2, a sex-related difference in the β-diversity was observed. A difference in the β-diversity was also shown between the female control mice of the two studies. We did not find major effects on the gut microbiome. This contrast to other studies may be due to variations in the study design. Our investigation underlined the important role of the sex of test animals and their microbiome composition prior to ENM exposure initiation. Hence, standardization of microbiome studies is strongly required to increase comparability. The ENM-specific effects on Actinobacteria and Roseburia, two taxa pivotal for the human gut homeostasis, warrant further research on their relevance for health.
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Affiliation(s)
- Gerrit Bredeck
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Angela A M Kämpfer
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Adriana Sofranko
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Tina Wahle
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Dominique Lison
- Louvain Centre for Toxicology and Applied Pharmacology, Université Catholique de Louvain, Brussels, Belgium
| | - Jérôme Ambroise
- Centre de Technologies Moléculaires Appliquées, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, Brussels, Belgium
| | - Burkhard Stahlmecke
- Institute for Energy and Environmental Technology e.V. (IUTA), Duisburg, Germany
| | - Catrin Albrecht
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Roel P F Schins
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
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24
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More S, Bampidis V, Benford D, Bragard C, Halldorsson T, Hernández‐Jerez A, Bennekou SH, Koutsoumanis K, Lambré C, Machera K, Naegeli H, Nielsen S, Schlatter J, Schrenk D, Silano (deceased) V, Turck D, Younes M, Castenmiller J, Chaudhry Q, Cubadda F, Franz R, Gott D, Mast J, Mortensen A, Oomen AG, Weigel S, Barthelemy E, Rincon A, Tarazona J, Schoonjans R. Guidance on technical requirements for regulated food and feed product applications to establish the presence of small particles including nanoparticles. EFSA J 2021; 19:e06769. [PMID: 34377191 PMCID: PMC8331058 DOI: 10.2903/j.efsa.2021.6769] [Citation(s) in RCA: 63] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Following a mandate from the European Commission, EFSA has developed a Guidance on Technical Requirements (Guidance on Particle-TR), defining the criteria for assessing the presence of a fraction of small particles, and setting out information requirements for applications in the regulated food and feed product areas (e.g. novel food, food/feed additives, food contact materials and pesticides). These requirements apply to particles requiring specific assessment at the nanoscale in conventional materials that do not meet the definition of engineered nanomaterial as set out in the Novel Food Regulation (EU) 2015/2283. The guidance outlines appraisal criteria grouped in three sections, to confirm whether or not the conventional risk assessment should be complemented with nanospecific considerations. The first group addresses solubility and dissolution rate as key physicochemical properties to assess whether consumers will be exposed to particles. The second group establishes the information requirements for assessing whether the conventional material contains a fraction or consists of small particles, and its characterisation. The third group describes the information to be presented for existing safety studies to demonstrate that the fraction of small particles, including particles at the nanoscale, has been properly evaluated. In addition, in order to guide the appraisal of existing safety studies, recommendations for closing the data gaps while minimising the need for conducting new animal studies are provided. This Guidance on Particle-TR complements the Guidance on risk assessment of nanomaterials to be applied in the food and feed chain, human and animal health updated by the EFSA Scientific Committee as co-published with this Guidance. Applicants are advised to consult both guidance documents before conducting new studies.
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25
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More S, Bampidis V, Benford D, Bragard C, Halldorsson T, Hernández‐Jerez A, Hougaard Bennekou S, Koutsoumanis K, Lambré C, Machera K, Naegeli H, Nielsen S, Schlatter J, Schrenk D, Silano (deceased) V, Turck D, Younes M, Castenmiller J, Chaudhry Q, Cubadda F, Franz R, Gott D, Mast J, Mortensen A, Oomen AG, Weigel S, Barthelemy E, Rincon A, Tarazona J, Schoonjans R. Guidance on risk assessment of nanomaterials to be applied in the food and feed chain: human and animal health. EFSA J 2021; 19:e06768. [PMID: 34377190 PMCID: PMC8331059 DOI: 10.2903/j.efsa.2021.6768] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/30/2021] [Indexed: 02/08/2023] Open
Abstract
The EFSA has updated the Guidance on risk assessment of the application of nanoscience and nanotechnologies in the food and feed chain, human and animal health. It covers the application areas within EFSA's remit, including novel foods, food contact materials, food/feed additives and pesticides. The updated guidance, now Scientific Committee Guidance on nano risk assessment (SC Guidance on Nano-RA), has taken account of relevant scientific studies that provide insights to physico-chemical properties, exposure assessment and hazard characterisation of nanomaterials and areas of applicability. Together with the accompanying Guidance on Technical requirements for regulated food and feed product applications to establish the presence of small particles including nanoparticles (Guidance on Particle-TR), the SC Guidance on Nano-RA specifically elaborates on physico-chemical characterisation, key parameters that should be measured, methods and techniques that can be used for characterisation of nanomaterials and their determination in complex matrices. The SC Guidance on Nano-RA also details aspects relating to exposure assessment and hazard identification and characterisation. In particular, nanospecific considerations relating to in vitro/in vivo toxicological studies are discussed and a tiered framework for toxicological testing is outlined. Furthermore, in vitro degradation, toxicokinetics, genotoxicity, local and systemic toxicity as well as general issues relating to testing of nanomaterials are described. Depending on the initial tier results, additional studies may be needed to investigate reproductive and developmental toxicity, chronic toxicity and carcinogenicity, immunotoxicity and allergenicity, neurotoxicity, effects on gut microbiome and endocrine activity. The possible use of read-across to fill data gaps as well as the potential use of integrated testing strategies and the knowledge of modes or mechanisms of action are also discussed. The Guidance proposes approaches to risk characterisation and uncertainty analysis.
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26
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Keller JG, Persson M, Müller P, Ma-Hock L, Werle K, Arts J, Landsiedel R, Wohlleben W. Variation in dissolution behavior among different nanoforms and its implication for grouping approaches in inhalation toxicity. NANOIMPACT 2021; 23:100341. [PMID: 35559842 DOI: 10.1016/j.impact.2021.100341] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 06/17/2021] [Accepted: 07/06/2021] [Indexed: 06/15/2023]
Abstract
Different nanoforms (NF) of the same substance each need to be registered under REACH, but similarities in physiological interaction -among them biodissolution- can justify read-across within a group of NFs, thereby reducing the need to perform animal studies. Here we focused on the endpoint of inhalation toxicity and explored how differences in physical parameters of 17 NFs of silica, and organic and inorganic pigments impact dissolution rates, half-times, and transformation under both pH 7.4 lung lining conditions and pH 4.5 lysosomal conditions. We benchmarked our observations against well-known TiO2, BaSO4 and ZnO nanomaterials, representing very slow, partial and quick dissolution respectively. By automated image evaluation, structural transformations were observed for dissolution rates in the order of 0.1 to 10 ng/cm2/h, but did not provide additional decision criteria on the similarity of NFs. Dissolution half-times spanned nearly five orders of magnitude, mostly dictated by the substance and simulant fluid, but modulated up to ten-fold by the subtle differences between NFs. Physiological time scales and benchmark materials help to frame the biologically relevant range, proposed as 1 h to 1 y. NFs of ZnO, Ag, SiO2, BaSO4 were in this range. We proposed numerical rules of pairwise similarity within a group, of which the worst case NF would be further assessed by in vivo inhalation studies. These rules divided the colloidal silica NFs into two separate candidate groups, one with Al-doping, one without. Shape or silane surface treatment were less important. The dissolution halftimes of many organic and inorganic pigment NFs were longer than the biologically relevant range, such that dissolution behavior is not an obstacle for their groupings.
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Affiliation(s)
- Johannes G Keller
- BASF SE, Dept. Experimental Toxicology and Ecology, Dept. Material Physics, 67056 Ludwigshafen, Germany.
| | - Michael Persson
- Nouryon Pulp and Performance Chemicals AB, S-445 80 Bohus, Sweden.
| | - Philipp Müller
- BASF SE, Dept. Experimental Toxicology and Ecology, Dept. Material Physics, 67056 Ludwigshafen, Germany.
| | - Lan Ma-Hock
- BASF SE, Dept. Experimental Toxicology and Ecology, Dept. Material Physics, 67056 Ludwigshafen, Germany.
| | - Kai Werle
- BASF SE, Dept. Experimental Toxicology and Ecology, Dept. Material Physics, 67056 Ludwigshafen, Germany.
| | - Josje Arts
- Nouryon Pulp and Performance Chemicals AB, S-445 80 Bohus, Sweden.
| | - Robert Landsiedel
- BASF SE, Dept. Experimental Toxicology and Ecology, Dept. Material Physics, 67056 Ludwigshafen, Germany.
| | - Wendel Wohlleben
- BASF SE, Dept. Experimental Toxicology and Ecology, Dept. Material Physics, 67056 Ludwigshafen, Germany.
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27
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Younes M, Aquilina G, Castle L, Engel K, Fowler P, Frutos Fernandez MJ, Fürst P, Gundert‐Remy U, Gürtler R, Husøy T, Manco M, Mennes W, Moldeus P, Passamonti S, Shah R, Waalkens‐Berendsen I, Wölfle D, Corsini E, Cubadda F, De Groot D, FitzGerald R, Gunnare S, Gutleb AC, Mast J, Mortensen A, Oomen A, Piersma A, Plichta V, Ulbrich B, Van Loveren H, Benford D, Bignami M, Bolognesi C, Crebelli R, Dusinska M, Marcon F, Nielsen E, Schlatter J, Vleminckx C, Barmaz S, Carfí M, Civitella C, Giarola A, Rincon AM, Serafimova R, Smeraldi C, Tarazona J, Tard A, Wright M. Safety assessment of titanium dioxide (E171) as a food additive. EFSA J 2021; 19:e06585. [PMID: 33976718 PMCID: PMC8101360 DOI: 10.2903/j.efsa.2021.6585] [Citation(s) in RCA: 66] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The present opinion deals with an updated safety assessment of the food additive titanium dioxide (E 171) based on new relevant scientific evidence considered by the Panel to be reliable, including data obtained with TiO2 nanoparticles (NPs) and data from an extended one-generation reproductive toxicity (EOGRT) study. Less than 50% of constituent particles by number in E 171 have a minimum external dimension < 100 nm. In addition, the Panel noted that constituent particles < 30 nm amounted to less than 1% of particles by number. The Panel therefore considered that studies with TiO2 NPs < 30 nm were of limited relevance to the safety assessment of E 171. The Panel concluded that although gastrointestinal absorption of TiO2 particles is low, they may accumulate in the body. Studies on general and organ toxicity did not indicate adverse effects with either E 171 up to a dose of 1,000 mg/kg body weight (bw) per day or with TiO2 NPs (> 30 nm) up to the highest dose tested of 100 mg/kg bw per day. No effects on reproductive and developmental toxicity were observed up to a dose of 1,000 mg E 171/kg bw per day, the highest dose tested in the EOGRT study. However, observations of potential immunotoxicity and inflammation with E 171 and potential neurotoxicity with TiO2 NPs, together with the potential induction of aberrant crypt foci with E 171, may indicate adverse effects. With respect to genotoxicity, the Panel concluded that TiO2 particles have the potential to induce DNA strand breaks and chromosomal damage, but not gene mutations. No clear correlation was observed between the physico-chemical properties of TiO2 particles and the outcome of either in vitro or in vivo genotoxicity assays. A concern for genotoxicity of TiO2 particles that may be present in E 171 could therefore not be ruled out. Several modes of action for the genotoxicity may operate in parallel and the relative contributions of different molecular mechanisms elicited by TiO2 particles are not known. There was uncertainty as to whether a threshold mode of action could be assumed. In addition, a cut-off value for TiO2 particle size with respect to genotoxicity could not be identified. No appropriately designed study was available to investigate the potential carcinogenic effects of TiO2 NPs. Based on all the evidence available, a concern for genotoxicity could not be ruled out, and given the many uncertainties, the Panel concluded that E 171 can no longer be considered as safe when used as a food additive.
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28
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Hetzer B, Gräf V, Walz E, Greiner R. Characterisation of TiO 2-containing pearlescent pigments with regard to the European Union labelling obligation of engineered nanomaterials in food. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2021; 38:741-753. [PMID: 33852817 DOI: 10.1080/19440049.2021.1901998] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
A wide range of trendy food colourants and ready-to-eat foods containing pearlescent pigments providing glitter effects is currently on the market. These pearlescent pigments consist of mica (potassium aluminium silicate) platelets generally coated with titanium dioxide and/or iron oxides. All single components are approved food additives in the European Union (EU) (E 555, E 171 and E 172). However, the European Food Safety Authority (EFSA) has stated recently, that pearlescent pigments should be evaluated as new food additives. Food grade titanium dioxide was already shown to contain a considerable fraction of nanoparticles. Thus, the question about 'nano'-labelling of TiO2-containing pearlescent pigments according to the 'Novel Food' and 'Food Information to Consumers' regulations arose. In order to provide data for dealing with these issues, in this study four commercially available products of different food categories containing pearlescent pigments were characterised with focus on the structure, size and chemical composition of these pigments. The measurement methods used were flow particle image analysis (FPIA), static light scattering (SLS) and scanning electron microscopy (SEM) combined with energy-dispersive x-ray spectroscopy (EDX). After isolation from various food matrices, the glitter pigments could be easily identified and differentiated by fast FPIA screening from any remaining organic food matrix particles due to their typical platelet-like shape and transparency. The particle size distribution of the platelets was determined by means of SLS and found to be in the range of 8-167 µm. SEM was identified as the most suitable technique for the analysis of the nano-structured coating. For all constituent metal oxide particles (TiO2 and/or Fe2O3) a median minimum Feret diameter (Fmin) of 29.9-46.8 nm was obtained by quantitative SEM image analysis.
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Affiliation(s)
- Birgit Hetzer
- Department of Food Technology and Bioprocess Engineering, Max Rubner-Institut, Karlsruhe, Germany
| | - Volker Gräf
- Department of Food Technology and Bioprocess Engineering, Max Rubner-Institut, Karlsruhe, Germany
| | - Elke Walz
- Department of Food Technology and Bioprocess Engineering, Max Rubner-Institut, Karlsruhe, Germany
| | - Ralf Greiner
- Department of Food Technology and Bioprocess Engineering, Max Rubner-Institut, Karlsruhe, Germany
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29
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Li B, Chua SL, Yu D, Chan SH, Li A. Separation and size characterization of highly polydisperse titanium dioxide nanoparticles (E171) in powdered beverages by using Asymmetric Flow Field-Flow Fractionation hyphenated with Multi-Angle Light Scattering and Inductively Coupled Plasma Mass Spectrometry. J Chromatogr A 2021; 1643:462059. [PMID: 33780882 DOI: 10.1016/j.chroma.2021.462059] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Revised: 02/19/2021] [Accepted: 03/07/2021] [Indexed: 10/21/2022]
Abstract
The application of titanium dioxide as E171 food additive has become an issue of debate due to numerous reports that titanium dioxide nanoparticles (TiO2 NPs) inside the products may pose risks to human health. However, there is still a lack of an official standardized methodology for the detection and size characterization of TiO2 particles in foods containing E171. In this study, a method was presented for size characterization of TiO2 particles with various independent verifications in coffee creamer and instant drink powders, using Asymmetric Flow Field-Flow Fractionation hyphenated with Multi-Angle Light Scattering and Inductively Coupled Plasma Mass Spectrometry (AF4-MALS-ICP-MS). TiO2 particles from these products were well extracted, followed by their optimized AF4 separation using anionic surfactant Sodium Dodecyl Sulfate (SDS) (0.05%, pH 9) and mixed surfactant NovaChem (0.2%), respectively. Size determination of TiO2 NPs was conducted based on AF4 calibration with polystyrene nanospheres and verification with TiO2 NPs standard suspension of 100 nm under two different AF4 conditions. The TiO2 particle sizes detected ranged from 24.4 - 544.3 nm for coffee creamer and 27.7 - 574.3 nm for instant drink powders, with the TiO2 NPs detection recoveries of 75% and 92%, respectively. Hydrodynamic diameters from AF4 size calibration could be independently validated by the gyration diameters from online MALS measurement. The established approach was demonstrated to be reliable and pragmatic for size profiling of highly polydisperse TiO2 particles and thus useful for monitoring E171 in similar foodstuffs.
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Affiliation(s)
- Bin Li
- National Centre for Food Science, Singapore Food Agency, 10 Perahu Road, Singapore 718837, Singapore
| | - Sew Lay Chua
- National Centre for Food Science, Singapore Food Agency, 10 Perahu Road, Singapore 718837, Singapore
| | - Dingyi Yu
- National Centre for Food Science, Singapore Food Agency, 10 Perahu Road, Singapore 718837, Singapore.
| | - Sheot Harn Chan
- National Centre for Food Science, Singapore Food Agency, 10 Perahu Road, Singapore 718837, Singapore
| | - Angela Li
- National Centre for Food Science, Singapore Food Agency, 10 Perahu Road, Singapore 718837, Singapore
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30
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Geiss O, Bianchi I, Senaldi C, Bucher G, Verleysen E, Waegeneers N, Brassinne F, Mast J, Loeschner K, Vidmar J, Aureli F, Cubadda F, Raggi A, Iacoponi F, Peters R, Undas A, Müller A, Meinhardt AK, Walz E, Gräf V, Barrero-Moreno J. Particle size analysis of pristine food-grade titanium dioxide and E 171 in confectionery products: Interlaboratory testing of a single-particle inductively coupled plasma mass spectrometry screening method and confirmation with transmission electron microscopy. Food Control 2021; 120:107550. [PMID: 33536722 PMCID: PMC7730118 DOI: 10.1016/j.foodcont.2020.107550] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Titanium dioxide is a white colourant authorised as food additive E 171 in the EU, where it is used in a range of alimentary products. As these materials may contain a fraction of particulates with sizes below 100 nm and current EU regulation requires specific labelling of food ingredient to indicate the presence of engineered nanomaterials there is now a need for standardised and validated methods to appropriately size and quantify (nano)particles in food matrices. A single-particle inductively coupled plasma mass spectrometry (spICP-MS) screening method for the determination of the size distribution and concentration of titanium dioxide particles in sugar-coated confectionery and pristine food-grade titanium dioxide was developed. Special emphasis was placed on the sample preparation procedure, crucial to reproducibly disperse the particles before analysis. The transferability of this method was tested in an interlaboratory comparison study among seven experienced European food control and food research laboratories equipped with various ICP-MS instruments and using different software packages. The assessed measurands included the particle mean diameter, the most frequent diameter, the percentage of particles (in number) with a diameter below 100 nm, the particles' number concentration and a number of cumulative particle size distribution parameters (D0, D10, D50, D99.5, D99.8 and D100). The evaluated method's performance characteristics were, the within-laboratory precision, expressed as the relative repeatability standard deviation (RSDr), and the between-laboratory precision, expressed as the relative reproducibility standard deviation (RSDR). Transmission electron microscopy (TEM) was used as a confirmatory technique and served as the basis for bias estimation. The optimisation of the sample preparation step showed that when this protocol was applied to the relatively simple sample food matrices used in this study, bath sonication turned out to be sufficient to reach the highest, achievable degree of dispersed constituent particles. For the pristine material, probe sonication was required. Repeatability and reproducibility were below 10% and 25% respectively for most measurands except for the lower (D0) and the upper (D100) bound of the particle size distribution and the particle number concentration. The broader distribution of the lower and the upper bounds could be attributed to instrument-specific settings/setups (e.g. the timing parameters, the transport efficiency, type of mass-spectrometer) and software-specific data treatment algorithms. Differences in the upper bound were identified as being due to the non-harmonised application of the upper counting limit. Reporting D99.5 or D99.8 instead of the effectively largest particle diameter (D100) excluded isolated large particles and considerably improved the reproducibility. The particle number-concentration was found to be influenced by small differences in the sample preparation procedure. The comparison of these results with those obtained using electron microscopy showed that the mean and median particle diameter was, in all cases, higher when using spICP-MS. The main reason for this was the higher size detection limit for spICP-MS plus the fact that some of the analysed particles remained agglomerated/aggregated after sonication. Single particle ICP-MS is a powerful screening technique, which in many cases provides sufficient evidence to confirm the need to label a food product as containing (engineered) titanium dioxide nanomaterial according to the current EU regulatory requirements. The overall positive outcome of the method performance evaluation and the current lack of alternative standardised procedures, would indicate this method as being a promising candidate for a full validation study. Standardised methods for sizing of E171 particles in food matrices are unavailable. Screening method based on spICP-MS is proposed. Analytical performance parameters and transferability tested in ILC.
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Affiliation(s)
- Otmar Geiss
- European Commission, Joint Research Centre (JRC), Ispra, Italy
| | - Ivana Bianchi
- European Commission, Joint Research Centre (JRC), Ispra, Italy
| | - Chiara Senaldi
- European Commission, Joint Research Centre (JRC), Ispra, Italy
| | - Guillaume Bucher
- Service Commun des Laboratoires (SCL), 3 Avenue Dr Albert Schweitzer, 33600, Pessac, France
| | - Eveline Verleysen
- Sciensano, Trace Elements and Nanomaterials, Uccle/Tervuren, Belgium
| | - Nadia Waegeneers
- Sciensano, Trace Elements and Nanomaterials, Uccle/Tervuren, Belgium
| | | | - Jan Mast
- Sciensano, Trace Elements and Nanomaterials, Uccle/Tervuren, Belgium
| | - Katrin Loeschner
- Division for Food Technology, National Food Institute, Technical University of Denmark, Kemitorvet 201, DK-2800 Kgs. Lyngby, Denmark
| | - Janja Vidmar
- Division for Food Technology, National Food Institute, Technical University of Denmark, Kemitorvet 201, DK-2800 Kgs. Lyngby, Denmark
| | - Federica Aureli
- Istituto Superiore di Sanità (ISS), National Institute of Health, Rome, Italy
| | - Francesco Cubadda
- Istituto Superiore di Sanità (ISS), National Institute of Health, Rome, Italy
| | - Andrea Raggi
- Istituto Superiore di Sanità (ISS), National Institute of Health, Rome, Italy
| | - Francesca Iacoponi
- Istituto Superiore di Sanità (ISS), National Institute of Health, Rome, Italy
| | - Ruud Peters
- Wageningen Food Safety Research (WFSR), Wageningen University & Research, Business Unit Contaminants & Toxins, Akkermaalsbos 2, 6708, WB Wageningen, the Netherlands
| | - Anna Undas
- Wageningen Food Safety Research (WFSR), Wageningen University & Research, Business Unit Contaminants & Toxins, Akkermaalsbos 2, 6708, WB Wageningen, the Netherlands
| | - Alexandra Müller
- Max Rubner-Institut (MRI), Federal Research Institute of Nutrition and Food, Department of Food Technology and Bioprocess Engineering, Haid-und-Neu-Straße 9, 76131, Karlsruhe, Germany
| | - Ann-Katrin Meinhardt
- Max Rubner-Institut (MRI), Federal Research Institute of Nutrition and Food, Department of Food Technology and Bioprocess Engineering, Haid-und-Neu-Straße 9, 76131, Karlsruhe, Germany
| | - Elke Walz
- Max Rubner-Institut (MRI), Federal Research Institute of Nutrition and Food, Department of Food Technology and Bioprocess Engineering, Haid-und-Neu-Straße 9, 76131, Karlsruhe, Germany
| | - Volker Gräf
- Max Rubner-Institut (MRI), Federal Research Institute of Nutrition and Food, Department of Food Technology and Bioprocess Engineering, Haid-und-Neu-Straße 9, 76131, Karlsruhe, Germany
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Dudefoi W, Rabesona H, Rivard C, Mercier-Bonin M, Humbert B, Terrisse H, Ropers MH. In vitro digestion of food grade TiO 2 (E171) and TiO 2 nanoparticles: physicochemical characterization and impact on the activity of digestive enzymes. Food Funct 2021; 12:5975-5988. [PMID: 34032251 DOI: 10.1039/d1fo00499a] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Titanium dioxide is a food additive that has raised some concerns for humans due to the presence of nanoparticles. We were interested in knowing the fate of TiO2 particles in the gastro-intestinal tract and their potential effect on digestive enzymes. For this purpose, we analysed the behaviour of two different food grade TiO2 samples (E171) and one nano-sized TiO2 sample (P25) through a standardized static in vitro digestion protocol simulating the oral, gastric and intestinal phases with appropriate juices including enzymes. Both E171 and P25 TiO2 particles remained intact in the digestive fluids but formed large agglomerates, and especially in the intestinal fluid where up to 500 μm sized particles have been identified. The formation of these agglomerates is mediated by the adsorption of mainly α-amylase and divalent cations. Pepsin was also identified to adsorb onto TiO2 particles but only in the case of silica-covered E171. In the salivary conditions, TiO2 exerted an inhibitory action on the enzymatic activity of α-amylase. The activity was reduced by a factor dependent on enzyme concentrations (up to 34% at 1 mg mL-1) but this inhibitory effect was reduced to hardly 10% in the intestinal fluid. In the gastric phase, pepsin was not affected by any form of TiO2. Our results hint that food grade TiO2 has a limited impact on the global digestion of carbohydrates and proteins. However, the reduced activity specifically observed in the oral phase deserves deeper investigation to prevent any adverse health effects related to the slowdown of carbohydrate metabolism.
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Affiliation(s)
- William Dudefoi
- INRAE, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France.
| | - Hanitra Rabesona
- INRAE, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France.
| | - Camille Rivard
- INRAE, UAR 1008 TRANSFORM, 44300 Nantes, France and Synchrotron SOLEIL, LUCIA Beamline, 91192 Gif-sur-Yvette, France
| | - Muriel Mercier-Bonin
- Toxalim (Research Center in Food Toxicology), Université de Toulouse, INRAE, ENVT, INP-Purpan, UPS, Toulouse, France
| | - Bernard Humbert
- Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, F-44000 Nantes, France
| | - Hélène Terrisse
- Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, F-44000 Nantes, France
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Bischoff NS, de Kok TM, Sijm DT, van Breda SG, Briedé JJ, Castenmiller JJ, Opperhuizen A, Chirino YI, Dirven H, Gott D, Houdeau E, Oomen AG, Poulsen M, Rogler G, van Loveren H. Possible Adverse Effects of Food Additive E171 (Titanium Dioxide) Related to Particle Specific Human Toxicity, Including the Immune System. Int J Mol Sci 2020; 22:ijms22010207. [PMID: 33379217 PMCID: PMC7795714 DOI: 10.3390/ijms22010207] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 12/18/2020] [Accepted: 12/24/2020] [Indexed: 12/12/2022] Open
Abstract
Titanium dioxide (TiO2) is used as a food additive (E171) and can be found in sauces, icings, and chewing gums, as well as in personal care products such as toothpaste and pharmaceutical tablets. Along with the ubiquitous presence of TiO2 and recent insights into its potentially hazardous properties, there are concerns about its application in commercially available products. Especially the nano-sized particle fraction (<100 nm) of TiO2 warrants a more detailed evaluation of potential adverse health effects after ingestion. A workshop organized by the Dutch Office for Risk Assessment and Research (BuRO) identified uncertainties and knowledge gaps regarding the gastrointestinal absorption of TiO2, its distribution, the potential for accumulation, and induction of adverse health effects such as inflammation, DNA damage, and tumor promotion. This review aims to identify and evaluate recent toxicological studies on food-grade TiO2 and nano-sized TiO2 in ex-vivo, in-vitro, and in-vivo experiments along the gastrointestinal route, and to postulate an Adverse Outcome Pathway (AOP) following ingestion. Additionally, this review summarizes recommendations and outcomes of the expert meeting held by the BuRO in 2018, in order to contribute to the hazard identification and risk assessment process of ingested TiO2.
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Affiliation(s)
- Nicolaj S. Bischoff
- Department of Toxicogenomics, GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 616, 6200 MD Maastricht, The Netherlands; (T.M.d.K.); (D.T.H.M.S.); (S.G.v.B.); (J.J.B.)
- Correspondence:
| | - Theo M. de Kok
- Department of Toxicogenomics, GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 616, 6200 MD Maastricht, The Netherlands; (T.M.d.K.); (D.T.H.M.S.); (S.G.v.B.); (J.J.B.)
| | - Dick T.H.M. Sijm
- Department of Toxicogenomics, GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 616, 6200 MD Maastricht, The Netherlands; (T.M.d.K.); (D.T.H.M.S.); (S.G.v.B.); (J.J.B.)
- Netherlands Food and Consumer Product Safety Authority, P.O. Box 43006, 3540 AA Utrecht, The Netherlands; (J.J.M.C.); (A.O.); (H.v.L.)
| | - Simone G. van Breda
- Department of Toxicogenomics, GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 616, 6200 MD Maastricht, The Netherlands; (T.M.d.K.); (D.T.H.M.S.); (S.G.v.B.); (J.J.B.)
| | - Jacco J. Briedé
- Department of Toxicogenomics, GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 616, 6200 MD Maastricht, The Netherlands; (T.M.d.K.); (D.T.H.M.S.); (S.G.v.B.); (J.J.B.)
| | - Jacqueline J.M. Castenmiller
- Netherlands Food and Consumer Product Safety Authority, P.O. Box 43006, 3540 AA Utrecht, The Netherlands; (J.J.M.C.); (A.O.); (H.v.L.)
| | - Antoon Opperhuizen
- Netherlands Food and Consumer Product Safety Authority, P.O. Box 43006, 3540 AA Utrecht, The Netherlands; (J.J.M.C.); (A.O.); (H.v.L.)
| | - Yolanda I. Chirino
- Unidad de Biomedicina, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autonóma de México, Mexico City 54090, Mexico;
| | - Hubert Dirven
- Norwegian Institute of Public Health, P.O. Box 222 Skøyen, 0213 Oslo, Norway;
| | - David Gott
- Food Standard Agency, London SW1H9EX, UK;
| | - Eric Houdeau
- French National Research Institute for Agriculture, Food and Environment (INRAE), 75338 Paris, France;
| | - Agnes G. Oomen
- National Institute for Public Health and the Environment, P.O. Box 1, 3720 BA Bilthoven, The Netherlands;
| | - Morten Poulsen
- National Food Institute, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark;
| | - Gerhard Rogler
- Department of Gastroenterology and Hepatology, University Hospital of Zurich, 8091 Zurich, Switzerland;
| | - Henk van Loveren
- Netherlands Food and Consumer Product Safety Authority, P.O. Box 43006, 3540 AA Utrecht, The Netherlands; (J.J.M.C.); (A.O.); (H.v.L.)
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Ammendolia MG, De Berardis B, Maurizi L, Longhi C. Exposure to TiO 2 Nanoparticles Increases Listeria monocytogenes Infection of Intestinal Epithelial Cells. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E2196. [PMID: 33158026 PMCID: PMC7693858 DOI: 10.3390/nano10112196] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 10/29/2020] [Accepted: 11/02/2020] [Indexed: 12/18/2022]
Abstract
Titanium dioxide nanoparticles (TiO2 NPs) are widely used in a variety of consumer products. Cellular exposure to TiO2 NPs results in complex effects on cell physiology that could impact biological systems. We investigated the behavior of Listeria monocytogenes in intestinal epithelial cells pre-treated with either a low or high (1 and 20 µg/cm2) dose of TiO2 NPs. Our results indicate that the pre-treated cells with a low dose became more permissive to listeria infection; indeed, both adhesion and invasion were significantly increased compared to control. Increased invasion seems to be correlated to cytoskeletal alterations induced by nanoparticles, and higher bacterial survival might be due to the high levels of listeriolysin O that protects L. monocytogenes from reactive oxygen species (ROS). The potential risk of increased susceptibility to L. monocytogenes infection related to long-term intake of nanosized TiO2 at low doses should be considered.
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Affiliation(s)
- Maria Grazia Ammendolia
- National Center of Innovative Technologies in Public Health, Italian National Institute of Health, Viale Regina Elena 299, 00161 Rome, Italy;
| | - Barbara De Berardis
- National Center of Innovative Technologies in Public Health, Italian National Institute of Health, Viale Regina Elena 299, 00161 Rome, Italy;
| | - Linda Maurizi
- Department of Public Health and Infectious Diseases, “Sapienza” University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy; (L.M.); (C.L.)
| | - Catia Longhi
- Department of Public Health and Infectious Diseases, “Sapienza” University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy; (L.M.); (C.L.)
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Younes M, Aquilina G, Castle L, Engel K, Fowler P, Frutos Fernandez MJ, Fürst P, Gürtler R, Gundert‐Remy U, Husøy T, Manco M, Mennes W, Passamonti S, Shah R, Waalkens‐Berendsen DH, Wölfle D, Wright M, Boon P, Tobback P, Rincon AM, Tard A, Moldeus P. Re-evaluation of sodium aluminium silicate (E 554) and potassium aluminium silicate (E 555) as food additives. EFSA J 2020; 18:e06152. [PMID: 32874328 PMCID: PMC7448050 DOI: 10.2903/j.efsa.2020.6152] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The Panel on Food Additives and Flavourings (FAF) provided a scientific opinion re-evaluating the safety of Sodium aluminium silicate (E 554) and potassium aluminium silicate (E 555) as food additives. The Scientific Committee for Food (SCF) assigned these food additives together with other aluminium-containing food additives a provisional tolerable weekly intake (PTWI) of 7 mg aluminium/kg body weight (bw). In 2008, EFSA established a tolerable weekly intake (TWI) of 1 mg aluminium/kg bw per week. Sodium aluminium silicate was shown in rats to be absorbed to a limited extent at 0.12 ± 0.011%. The Panel considered that potassium aluminium silicate would be absorbed and become systemically available similarly to sodium aluminium silicate. No information on the physicochemical characterisation of sodium aluminium silicate and potassium aluminium silicate when used as food additives has been submitted and only very limited toxicological data were available for sodium aluminium silicate. Exposure to E 554 was calculated based on the reported use levels in food supplements. Exposure to aluminium from this use of E 554 was calculated to exceed the TWI for aluminium. Based on the data provided by interested business operators, the Panel considered that E 555 is not being used as a carrier, but as an inseparable component of 'potassium aluminium silicate-based pearlescent pigments'. The Panel calculated the regulatory maximum exposure to E 555 as a carrier for titanium dioxide (E 171) and iron oxides and hydroxides (E 172). Exposure to aluminium from this single use at the maximum permitted level could theoretically far exceed the TWI. Considering that only very limited toxicological data and insufficient information on the physicochemical characterisation of both food additives were available, the Panel concluded that the safety of sodium aluminium silicate (E 554) and potassium aluminium silicate (E 555) could not be assessed.
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