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Marangon CA, Otoni CG, Bertuso PC, Rossi PF, Dos Santos DM, Lourençon TV, Martins VCA, Plepis AMG, Mattoso LHC, Nitschke M. Side-stream lignins: Potential antioxidant and antimicrobial agents in milk. Food Res Int 2024; 180:114091. [PMID: 38395568 DOI: 10.1016/j.foodres.2024.114091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 01/26/2024] [Accepted: 01/31/2024] [Indexed: 02/25/2024]
Abstract
In recent years, lignin has drawn increasing attention due to its intrinsic antibacterial and antioxidant activities, biodegradability, and biocompatibility. Yet, like several other biogenic structures, its compositional heterogeneity represents a challenge to overcome. In addition, there are few studies regarding food applications of lignin. Herein, we evaluate the antimicrobial and antioxidant effects of lignin from two different sources. These lignins were characterized by attenuated total reflectance Fourier-transform infrared (ATR-FTIR) and hydrogen nuclear magnetic resonance (1H NMR) spectroscopies. Their antibacterial and antioxidant capacities (DPPH and Folin-Ciocalteu methods) were also investigated. Susceptibility tests were performed with the minimal inhibitory (MIC) and bactericidal (MBC) concentrations using the micro-broth dilution technique. Kraft lignin presented higher radical-scavenging and antibacterial activities than alkali lignin, indicating the dependence of antioxidant and antibacterial activities on the precursor biomass. Scanning electron microscopy shows morphologic changes in the bacteria after exposure to lignin, while confocal microscopy suggests that kraft lignin has affinity towards bacterial surfaces and the ability to cause cell membrane destabilization. Lignin inhibited the growth of Staphylococcus aureus and Salmonella Enteritidis in skimmed milk, herein taken as food model. Our results suggest that lignins are promising candidates for green additives to improve quality and safety within the food chain.
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Affiliation(s)
- Crisiane A Marangon
- Embrapa Instrumentation, Nanotechnology National Laboratory for Agriculture (LNNA), Rua XV de Novembro, 1452, São Carlos, SP 13560-979, Brazil
| | - Caio G Otoni
- Federal University of São Carlos (UFSCar), Graduate Program in Materials Science and Engineering (PPGCEM) & Department of Materials Engineering (DEMa), Rod. Washington Luis, 235, São Carlos, SP 13565-905, Brazil
| | - Paula C Bertuso
- University of São Paulo (USP), Interunit Graduate Program in Bioengineering (EESC/FMRP/IQSC), Av. Trabalhador São Carlense, 400, CP-780, São Carlos, SP 13566-590, Brazil
| | - Patrícia F Rossi
- Embrapa Instrumentation, Nanotechnology National Laboratory for Agriculture (LNNA), Rua XV de Novembro, 1452, São Carlos, SP 13560-979, Brazil; Federal University of Minas Gerais (UFMG), Department of Metallurgical, Materials and Mining Engineering, Av. Antônio Carlos, 6627, Pampulha - Belo Horizonte, MG 31270-901, Brazil
| | - Danilo M Dos Santos
- Embrapa Instrumentation, Nanotechnology National Laboratory for Agriculture (LNNA), Rua XV de Novembro, 1452, São Carlos, SP 13560-979, Brazil
| | - Tainise V Lourençon
- Aalto University, Department of Bioprocesses and Bioproducts, P.O. Box 16300, Aalto, Finland
| | - Virginia C A Martins
- University of São Paulo (USP), São Carlos Institute of Chemistry (IQSC), Av. Trabalhador São Carlense, 400, CP-780, São Carlos, SP 13560-970, Brazil
| | - Ana Maria G Plepis
- University of São Paulo (USP), Interunit Graduate Program in Bioengineering (EESC/FMRP/IQSC), Av. Trabalhador São Carlense, 400, CP-780, São Carlos, SP 13566-590, Brazil; University of São Paulo (USP), São Carlos Institute of Chemistry (IQSC), Av. Trabalhador São Carlense, 400, CP-780, São Carlos, SP 13560-970, Brazil
| | - Luiz H C Mattoso
- Embrapa Instrumentation, Nanotechnology National Laboratory for Agriculture (LNNA), Rua XV de Novembro, 1452, São Carlos, SP 13560-979, Brazil
| | - Marcia Nitschke
- University of São Paulo (USP), Interunit Graduate Program in Bioengineering (EESC/FMRP/IQSC), Av. Trabalhador São Carlense, 400, CP-780, São Carlos, SP 13566-590, Brazil; University of São Paulo (USP), São Carlos Institute of Chemistry (IQSC), Av. Trabalhador São Carlense, 400, CP-780, São Carlos, SP 13560-970, Brazil.
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2
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Teodoro KBR, Silva MJ, Andre RS, Schneider R, Martins MA, Mattoso LHC, Correa DS. Exploring the potential of cellulose autofluorescence for optical detection of tannin in red wines. Carbohydr Polym 2024; 324:121494. [PMID: 37985086 DOI: 10.1016/j.carbpol.2023.121494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 09/08/2023] [Accepted: 10/12/2023] [Indexed: 11/22/2023]
Abstract
The growing demand for opto-electronic devices within an automated landscape has opened up new opportunities for harnessing sustainable cellulose materials for sensors technology. Cellulose, a versatile material, enables its combination with other materials, but in most of these applications, cellulose is typically employed as support or substrate, while its inherent autofluorescence remains largely underexplored for sensors. In light of this context, this study delves into the autofluorescence characteristics of pristine cellulose nanocrystals extracted from wood via enzymatic route for optical sensors tailored to detect tannins. By fine-tuning the experimental setup, photoluminescence (PL) emission bands were scrutinized across three distinct spectral regions, namely 300-400 nm, 400-500 nm and 550-700 nm. The proposed mechanism reveals the occurrence of dynamic fluorescence quenching, which enabled the selective monitoring of tannins in red wines across a dynamic range spanning from 10 to 1060 μg mL-1. This sensing platform provided a limit of detection (LoD) of 6.1 μg mL-1. Notably, the sensing platform's efficacy was validated with remarkable recovery rates of 99.7 % and 95.3 % when subjected to testing with cabernet sauvignon and tannat wines. These findings emphasize the sensing platform's potential for monitoring tannic acids in beverages and food products.
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Affiliation(s)
- Kelcilene B R Teodoro
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, 13560-970 São Carlos, SP, Brazil.
| | - Maycon J Silva
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, 13560-970 São Carlos, SP, Brazil; PPGQ, Department of Chemistry, Center for Exact Sciences and Technology, Federal University of São Carlos (UFSCar), 13565-905 São Carlos, SP, Brazil
| | - Rafaela S Andre
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, 13560-970 São Carlos, SP, Brazil
| | - Rodrigo Schneider
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, 13560-970 São Carlos, SP, Brazil; PPGQ, Department of Chemistry, Center for Exact Sciences and Technology, Federal University of São Carlos (UFSCar), 13565-905 São Carlos, SP, Brazil
| | - Maria A Martins
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, 13560-970 São Carlos, SP, Brazil
| | - Luiz H C Mattoso
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, 13560-970 São Carlos, SP, Brazil
| | - Daniel S Correa
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, 13560-970 São Carlos, SP, Brazil.
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Giroto AS, Valle SF, Borges R, Colnago LA, Ribeiro TS, Jablonowski ND, Ribeiro C, Mattoso LHC. Revealing the Structure Formation on Polyglycerol Citrate Polymers-An Environmentally Friendly Polyester as a Seed-Coating Material. Polymers (Basel) 2023; 15:4303. [PMID: 37959983 PMCID: PMC10647340 DOI: 10.3390/polym15214303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 10/23/2023] [Accepted: 10/30/2023] [Indexed: 11/15/2023] Open
Abstract
A detailed structural investigation of a promising bio-based polymer, polyglycerol citrate polyester, obtained by the bulk polycondensation of glycerol (Gly) against citric acid (Cit) under mild reaction was performed. The reaction in conditions with and without catalyst use (sulfuric acid, H2SO4) was investigated, showing evidence that it is possible to modify the polymer solubility according to the ratio and catalyst utilization. 13C and 1H NMR indicated that synthesis catalyzed with Cit excess leads to higher esterification degrees of citrate groups. In contrast, the Gly moieties are more prominent in catalyzed polymers regardless of the excess monomers. Overall, a successful conversion of Gly and Cit into polyesters was attained even without catalysis, enabling a simple route for the large-scale production of this green material to be used as a coating material. This polymer has been shown to be well-suited for coating seeds and might be a promising material for similar agricultural applications. Tests on soybean seed coating with a PGCit solution of 75% indicated that the seed quality and germination rate were not affected by the PGCit coating, concluding that this polymer is suitable for this application.
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Affiliation(s)
- Amanda S. Giroto
- Embrapa Instrumentation, XV de Novembro Street, 1452, São Carlos 13560-970, SP, Brazil; (S.F.V.); (L.A.C.); (L.H.C.M.)
- Forschungszentrum Jülich GmbH, Institute of Bio- and Geosciences, IBG-2: Plant Sciences, 52425 Jülich, Germany
| | - Stella F. Valle
- Embrapa Instrumentation, XV de Novembro Street, 1452, São Carlos 13560-970, SP, Brazil; (S.F.V.); (L.A.C.); (L.H.C.M.)
| | - Roger Borges
- Embrapa Instrumentation, XV de Novembro Street, 1452, São Carlos 13560-970, SP, Brazil; (S.F.V.); (L.A.C.); (L.H.C.M.)
| | - Luiz A. Colnago
- Embrapa Instrumentation, XV de Novembro Street, 1452, São Carlos 13560-970, SP, Brazil; (S.F.V.); (L.A.C.); (L.H.C.M.)
| | - Tatiana S. Ribeiro
- Department of Natural Science, Mathematics and Education, Federal University of São Carlos, Anhanguera, km 174, Araras 13604-900, SP, Brazil;
| | - Nicolai D. Jablonowski
- Forschungszentrum Jülich GmbH, Institute of Bio- and Geosciences, IBG-2: Plant Sciences, 52425 Jülich, Germany
| | - Caue Ribeiro
- Embrapa Instrumentation, XV de Novembro Street, 1452, São Carlos 13560-970, SP, Brazil; (S.F.V.); (L.A.C.); (L.H.C.M.)
| | - Luiz H. C. Mattoso
- Embrapa Instrumentation, XV de Novembro Street, 1452, São Carlos 13560-970, SP, Brazil; (S.F.V.); (L.A.C.); (L.H.C.M.)
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Paschoalin RT, Gomes NO, Almeida GF, Bilatto S, Farinas CS, Machado SAS, Mattoso LHC, Oliveira ON, Raymundo-Pereira PA. Wearable sensors made with solution-blow spinning poly(lactic acid) for non-enzymatic pesticide detection in agriculture and food safety. Biosens Bioelectron 2021; 199:113875. [PMID: 34922318 DOI: 10.1016/j.bios.2021.113875] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 11/19/2021] [Accepted: 12/07/2021] [Indexed: 12/12/2022]
Abstract
On-site monitoring the presence of pesticides on crops and food samples is essential for precision and post-harvest agriculture, which demands nondestructive analytical methods for rapid, low-cost detection that is not achievable with gold standard methods. The synergy between eco-friendly substrates and printed devices may lead to wearable sensors for decentralized analysis of pesticides in precision agriculture. In this paper we report on a wearable non-enzymatic electrochemical sensor capable of detecting carbamate and bipyridinium pesticides on the surface of agricultural and food samples. The low-cost devices (<US$ 0.08 per unit) contained three-electrode systems deposited via screen-printing technology (SPE) on solution-blow spinning mats of poly (lactic acid) (PLA). The flexible PLA/SPE sensors can be used on flat, curved and irregular surfaces of leaves, vegetables and fruits. Detection was performed using differential pulse voltammetry and square wave voltammetry with detection limits of 43 and 57 nM for carbendazim and diquat, respectively. The wearable non-enzymatic sensor can discriminate and quantify carbendazim and diquat on apple and cabbage skins with no interference from other pesticides. The use of such wearable sensors may be extended to other agrochemicals, including with incorporation of active bio (sensing) layers for online monitoring of any type of agricultural products and foods.
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Affiliation(s)
- Rafaella T Paschoalin
- São Carlos Institute of Physics, University of São Paulo, CEP 13560-970, São Carlos, SP, Brazil
| | - Nathalia O Gomes
- São Carlos Institute of Chemistry, University of São Paulo, CEP 13566-590, São Carlos, SP, Brazil
| | - Gabriela F Almeida
- Nanotechnology National Laboratory for Agribusiness (LNNA), Embrapa Instrumentation, 13560-970, São Carlos, SP, Brazil
| | - Stanley Bilatto
- Nanotechnology National Laboratory for Agribusiness (LNNA), Embrapa Instrumentation, 13560-970, São Carlos, SP, Brazil
| | - Cristiane S Farinas
- Nanotechnology National Laboratory for Agribusiness (LNNA), Embrapa Instrumentation, 13560-970, São Carlos, SP, Brazil
| | - Sergio A S Machado
- São Carlos Institute of Chemistry, University of São Paulo, CEP 13566-590, São Carlos, SP, Brazil
| | - Luiz H C Mattoso
- Nanotechnology National Laboratory for Agribusiness (LNNA), Embrapa Instrumentation, 13560-970, São Carlos, SP, Brazil
| | - Osvaldo N Oliveira
- São Carlos Institute of Physics, University of São Paulo, CEP 13560-970, São Carlos, SP, Brazil
| | - Paulo A Raymundo-Pereira
- São Carlos Institute of Physics, University of São Paulo, CEP 13560-970, São Carlos, SP, Brazil.
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5
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Soares JC, Soares AC, Angelim MKSC, Proença-Modena JL, Moraes-Vieira PM, Mattoso LHC, Oliveira ON. Diagnostics of SARS-CoV-2 infection using electrical impedance spectroscopy with an immunosensor to detect the spike protein. Talanta 2021; 239:123076. [PMID: 34876273 PMCID: PMC8607795 DOI: 10.1016/j.talanta.2021.123076] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 11/09/2021] [Accepted: 11/16/2021] [Indexed: 11/04/2022]
Abstract
Mass testing for the diagnostics of COVID-19 has been hampered in many countries owing to the high cost of the methodologies to detect genetic material of SARS-CoV-2. In this paper, we report on a low-cost immunosensor capable of detecting the spike protein of SARS-CoV-2, including in samples of inactivated virus. Detection is performed with electrical impedance spectroscopy using an immunosensor that contains a monolayer film of carboxymethyl chitosan as matrix, coated with an active layer of antibodies specific to the spike protein. In addition to a low limit of detection of 0.179 fg/mL within an almost linear behavior from 10−20 g/mL to 10−14 g/mL, the immunosensor was highly selective. For the samples with the spike protein could be distinguished in multidimensional projection plots from samples with other biomarkers and analytes that could be interfering species for healthy and infected patients. The excellent analytical performance of the immunosensors was validated with the distinction between control samples and those containing inactivated SARS-CoV-2 at different concentrations. The mechanism behind the immunosensor performance is the specific antibody-protein interaction, as confirmed with the changes induced in C–H stretching and protein bands in polarization-modulated infrared reflection absorption spectra (PM-IRRAS). Because impedance spectroscopy measurements can be made with low-cost portable instruments, the immunosensor proposed here can be applied in point-of-care diagnostics for mass testing even in places with limited resources.
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Affiliation(s)
- Juliana C Soares
- São Carlos Institute of Physics (IFSC), University of São Paulo (USP), 13566-590, São Carlos, Brazil
| | - Andrey C Soares
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970, São Carlos, SP, Brazil
| | - Monara Kaelle S C Angelim
- Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, University of Campinas, 13083-862, Campinas, SP, Brazil
| | - Jose Luiz Proença-Modena
- Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, University of Campinas, 13083-862, Campinas, SP, Brazil; Experimental Medicine Research Cluster (EMRC), University of Campinas, 13083-862, Campinas, SP, Brazil
| | - Pedro M Moraes-Vieira
- Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, University of Campinas, 13083-862, Campinas, SP, Brazil; Experimental Medicine Research Cluster (EMRC), University of Campinas, 13083-862, Campinas, SP, Brazil; Obesity and Comorbilities Research Center (OCRC), University of Campinas, 13083-862, Campinas, SP, Brazil
| | - Luiz H C Mattoso
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970, São Carlos, SP, Brazil
| | - Osvaldo N Oliveira
- São Carlos Institute of Physics (IFSC), University of São Paulo (USP), 13566-590, São Carlos, Brazil.
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Raja S, Buhl EM, Dreschers S, Schalla C, Zenke M, Sechi A, Mattoso LHC. Curauá-derived carbon dots: Fluorescent probes for effective Fe(III) ion detection, cellular labeling and bioimaging. Mater Sci Eng C Mater Biol Appl 2021; 129:112409. [PMID: 34579918 DOI: 10.1016/j.msec.2021.112409] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 08/17/2021] [Accepted: 08/31/2021] [Indexed: 01/21/2023]
Abstract
This study reports the generation of curauá-derived carbon dots (C-dots) and their suitability for Fe(III) detection, bioimaging and FACS analysis. C-dots were generated from curauá (Ananas erectifolius) fibers by a facile one-step hydrothermal approach. They exhibited graphite-like structure with a mean diameter of 2.4 nm, high water solubility, high levels of carboxyl and hydroxyl functional groups, excitation-dependent multicolor fluorescence emission (in the range 450 nm - 560 nm) and superior photostability. C-dots were highly selective and effective for the detection of ferric Fe(III) ion in an aqueous medium with a detection limit of 0.77 μM in the linear range of 0-30 μM, a value much lower than the guideline limits proposed by the World Health Organization (WHO). In biological cell systems, C-dots were very well tolerated by B16F1 mouse melanoma and J774.A1 mouse macrophages cell lines, both of which effectively internalized C-dots in their cytoplasmic compartment. Finally, C-dots were effective probes for long-term live cell imaging experiments and multi-channel flow cytometry analysis. Collectively, our findings demonstrate that curauá-derived C-dots serve as versatile and effective natural products for Fe(III) ion sensing, labeling and bioimaging of various cell types. This study adds novel C-dots to the library of carbon-based probes and paves the way towards a sustainable conversion of a most abundant biomass waste into value-added products.
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Affiliation(s)
- Sebastian Raja
- National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentação, São Carlos, SP 13560-970, Brazil; Institute of Biomedical Engineering, Department of Cell Biology, RWTH Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany; Helmholtz Institute of Biomedical Engineering, RWTH Aachen University, Pauwelsstrasse 20, 52074 Aachen, Germany.
| | - Eva Miriam Buhl
- Institute for Pathology, Electron Microscopy Facility, RWTH Aachen University, Pauwelsstrasse, 30, D-52074 Aachen, Germany
| | - Stephan Dreschers
- Department of Pediatrics, University Hospital, RWTH Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany
| | - Carmen Schalla
- Institute of Biomedical Engineering, Department of Cell Biology, RWTH Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany; Helmholtz Institute of Biomedical Engineering, RWTH Aachen University, Pauwelsstrasse 20, 52074 Aachen, Germany
| | - Martin Zenke
- Institute of Biomedical Engineering, Department of Cell Biology, RWTH Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany; Helmholtz Institute of Biomedical Engineering, RWTH Aachen University, Pauwelsstrasse 20, 52074 Aachen, Germany
| | - Antonio Sechi
- Institute of Biomedical Engineering, Department of Cell Biology, RWTH Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany; Helmholtz Institute of Biomedical Engineering, RWTH Aachen University, Pauwelsstrasse 20, 52074 Aachen, Germany
| | - Luiz H C Mattoso
- National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentação, São Carlos, SP 13560-970, Brazil
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de Gonzaga LAC, Martins MCF, Correa AC, Facchinatto WM, da Silva CMP, Colnago LA, Mattoso LHC. Production of carbon nanofibers from PAN and lignin by solution blow spinning. J Polym Res 2021. [DOI: 10.1007/s10965-021-02568-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Claro PIC, Cunha I, Paschoalin RT, Gaspar D, Miranda K, Oliveira ON, Martins R, Pereira L, Marconcini JM, Fortunato E, Mattoso LHC. Ionic Conductive Cellulose Mats by Solution Blow Spinning as Substrate and a Dielectric Interstrate Layer for Flexible Electronics. ACS Appl Mater Interfaces 2021; 13:26237-26246. [PMID: 34038087 DOI: 10.1021/acsami.1c06274] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Renewable cellulose substrates with submicron- and nanoscale structures have revived interest in paper electronics. However, the processes behind their production are still complex and time- and energy-consuming. Besides, the weak electrolytic properties of cellulose with submicron- and nanoscale structures have hindered its application in transistors and integrated circuits with low-voltage operation. Here, we report a simple, low-cost approach to produce flexible ionic conductive cellulose mats using solution blow spinning, which are used both as dielectric interstrate and substrate in low-voltage devices. The electrochemical properties of the cellulose mats are tuned through infiltration with alkali hydroxides (LiOH, NaOH, or KOH), enabling their application as dielectric and substrate in flexible, low-voltage, oxide-based field-effect transistors and pencil-drawn resistor-loaded inverters. The transistors exhibit good transistor performances under operation voltage below 2.5 V, and their electrical performance is strictly related to the type of alkali ionic specie incorporated. Devices fabricated on K+-infiltrated cellulose mats present the best characteristics, indicating pure capacitive charging of the semiconductor. The pencil-drawn load resistor inverter presents good dynamic performance. These findings may pave the way for a new generation of low-power, wearable electronics, enabling concepts such as the "Internet of Things".
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Affiliation(s)
- Pedro I C Claro
- Graduate Program in Materials Science and Engineering (PPG-CEM), Federal University of São Carlos, 13565-905 São Carlos, SP, Brazil
- i3N|CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Inês Cunha
- i3N|CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Rafaella T Paschoalin
- São Carlos Institute of Physics, University of São Paulo (USP), 13560-970 São Carlos, SP, Brazil
| | - Diana Gaspar
- i3N|CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Kelvi Miranda
- Graduate Program in Biomaterials Engineering (PPGBiomat), Federal University of Lavras, P.O. Box 3037, 37200-000 Lavras, MG, Brazil
| | - Osvaldo N Oliveira
- São Carlos Institute of Physics, University of São Paulo (USP), 13560-970 São Carlos, SP, Brazil
| | - Rodrigo Martins
- i3N|CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Luís Pereira
- i3N|CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal
| | - José M Marconcini
- National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentation, 13560-970 São Carlos, SP, Brazil
| | - Elvira Fortunato
- i3N|CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Luiz H C Mattoso
- National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentation, 13560-970 São Carlos, SP, Brazil
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Azzaz CM, Mattoso LHC, Demarquette NR, Zednik RJ. Polyvinylidene fluoride nanofibers obtained by electrospinning and blowspinning: Electrospinning enhances the piezoelectric
β‐phase
– myth or reality? J Appl Polym Sci 2021. [DOI: 10.1002/app.49959] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Cherif M. Azzaz
- École de Technologie Supérieure Université du Québec Montréal Québec Canada
| | - Luiz H. C. Mattoso
- Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA) Empresa Brasileira de Pesquisa Agropecuária São Paulo Brazil
| | | | - Ricardo J. Zednik
- École de Technologie Supérieure Université du Québec Montréal Québec Canada
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10
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Ferreira FV, Otoni CG, Lopes JH, de Souza LP, Mei LHI, Lona LMF, Lozano K, Lobo AO, Mattoso LHC. Ultrathin polymer fibers hybridized with bioactive ceramics: A review on fundamental pathways of electrospinning towards bone regeneration. Mater Sci Eng C Mater Biol Appl 2021; 123:111853. [PMID: 33812570 DOI: 10.1016/j.msec.2020.111853] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 12/21/2020] [Accepted: 12/26/2020] [Indexed: 10/22/2022]
Affiliation(s)
- Filipe V Ferreira
- School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Caio G Otoni
- Department of Materials Engineering (DEMa), Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil
| | - João H Lopes
- Department of Chemistry, Division of Fundamental Sciences (IEF), Technological Institute of Aeronautics (ITA), São Jose dos Campos, SP, Brazil
| | - Lucas P de Souza
- College of Engineering and Physical Sciences, Aston Institute of Materials Research, Aston University, Birmingham, UK
| | - Lucia H I Mei
- School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Liliane M F Lona
- School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Karen Lozano
- Department of Mechanical Engineering, The University of Texas Rio Grande Valley, Edinburg, TX, USA
| | - Anderson O Lobo
- Interdisciplinary Laboratory for Advanced Materials, BioMatLab, Materials Science and Engineering Graduate Program, Federal University of Piaui, Teresina, PI, Brazil.
| | - Luiz H C Mattoso
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, São Carlos, SP, Brazil.
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11
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Leite LSF, Bilatto S, Paschoalin RT, Soares AC, Moreira FKV, Oliveira ON, Mattoso LHC, Bras J. Eco-friendly gelatin films with rosin-grafted cellulose nanocrystals for antimicrobial packaging. Int J Biol Macromol 2020; 165:2974-2983. [PMID: 33122067 DOI: 10.1016/j.ijbiomac.2020.10.189] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 10/22/2020] [Accepted: 10/23/2020] [Indexed: 02/06/2023]
Abstract
We report on gelatin films incorporating rosin-grafted cellulose nanocrystals (r-CNCs), which fulfill the most relevant requirements for antimicrobial packaging applications. Transparent gelatin/r-CNCs bionanocomposite films (0.5-6 wt% r-CNCs) were obtained by solution casting and displayed high UV-barrier properties, which were superior to the most used plastic packaging films. The gelatin/r-CNCs films exhibited a moderate water vapor permeability (0.09 g mm/m2 h kPa), and high tensile strength (40 MPa) and Young's modulus (1.9 GPa). The r-CNCs were more efficient in improving the optical, water vapor barrier and tensile properties of gelatin films than conventional CNCs. Grafting of rosin on CNCs resulted in an antimicrobial nanocellulose that inhibited the growth of Staphylococcus aureus and Escherichia coli. The antibacterial properties of r-CNCs were sustained in the gelatin films, as demonstrated by agar diffusion tests and proof-of-principle experiments involving cheese storage. Overall, the incorporation of r-CNCs as active fillers in gelatin films is a suitable approach for producing novel eco-friendly, antimicrobial packaging materials.
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Affiliation(s)
- Liliane S F Leite
- Federal University of São Carlos, Graduate Program in Materials Science and Engineering (PPGCEM), 13565-905 São Carlos, Brazil; National Nanotechnology Laboratory for Agribusiness, Embrapa Instrumentação, XV de Novembro street, 1452, 13560-979 São Carlos, Brazil; University Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38400 Grenoble, France.
| | - Stanley Bilatto
- National Nanotechnology Laboratory for Agribusiness, Embrapa Instrumentação, XV de Novembro street, 1452, 13560-979 São Carlos, Brazil.
| | - Rafaella T Paschoalin
- University of São Paulo, São Carlos Institute of Physics, 13560-970 São Carlos, Brazil.
| | - Andrey C Soares
- National Nanotechnology Laboratory for Agribusiness, Embrapa Instrumentação, XV de Novembro street, 1452, 13560-979 São Carlos, Brazil.
| | - Francys K V Moreira
- Department of Materials Engineering, Federal University of São Carlos, Rod. Washington Luis, km 235, São Carlos, SP 13565-905, Brazil.
| | - Osvaldo N Oliveira
- University of São Paulo, São Carlos Institute of Physics, 13560-970 São Carlos, Brazil.
| | - Luiz H C Mattoso
- Federal University of São Carlos, Graduate Program in Materials Science and Engineering (PPGCEM), 13565-905 São Carlos, Brazil; National Nanotechnology Laboratory for Agribusiness, Embrapa Instrumentação, XV de Novembro street, 1452, 13560-979 São Carlos, Brazil.
| | - Julien Bras
- University Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38400 Grenoble, France; Nestle Research Center, 1000 Lausanne, Switzerland.
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12
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Raja S, Hamouda AEI, de Toledo MAS, Hu C, Bernardo MP, Schalla C, Leite LSF, Buhl EM, Dreschers S, Pich A, Zenke M, Mattoso LHC, Sechi A. Functionalized Cellulose Nanocrystals for Cellular Labeling and Bioimaging. Biomacromolecules 2020; 22:454-466. [PMID: 33284004 DOI: 10.1021/acs.biomac.0c01317] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Cellulose nanocrystals (CNCs) are unique and promising natural nanomaterials that can be extracted from native cellulose fibers by acid hydrolysis. In this study, we developed chemically modified CNC derivatives by covalent tethering of PEGylated biotin and perylenediimide (PDI)-based near-infrared organic dye and evaluated their suitability for labeling and imaging of different cell lines including J774A.1 macrophages, NIH-3T3 fibroblasts, HeLa adenocarcinoma cells, and primary murine dendritic cells. PDI-labeled CNCs showed a superior photostability compared to similar commercially available dyes under long periods of constant and high-intensity illumination. All CNC derivatives displayed excellent cytocompatibility toward all cell types and efficiently labeled cells in a dose-dependent manner. Moreover, CNCs were effectively internalized and localized in the cytoplasm around perinuclear areas. Thus, our findings demonstrate the suitability of these new CNC derivatives for labeling, imaging, and long-time tracking of a variety of cell lines and primary cells.
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Affiliation(s)
- Sebastian Raja
- National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentação, São Carlos-SP 13560-970, Brazil.,Institute of Biomedical Engineering, Dept. of Cell Biology, RWTH Aachen University, Pauwelsstraße, 30, Aachen D-52074, Germany
| | - Ahmed E I Hamouda
- Institute of Biomedical Engineering, Dept. of Cell Biology, RWTH Aachen University, Pauwelsstraße, 30, Aachen D-52074, Germany
| | - Marcelo A S de Toledo
- Institute of Biomedical Engineering, Dept. of Cell Biology, RWTH Aachen University, Pauwelsstraße, 30, Aachen D-52074, Germany
| | - Chaolei Hu
- DWI-Leibniz-Institute for Interactive Materials, RWTH Aachen University, Forckenbeckstraße 50, Aachen D-52074, Germany
| | - Marcela P Bernardo
- National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentação, São Carlos-SP 13560-970, Brazil.,Institute of Biomedical Engineering, Dept. of Cell Biology, RWTH Aachen University, Pauwelsstraße, 30, Aachen D-52074, Germany
| | - Carmen Schalla
- Institute of Biomedical Engineering, Dept. of Cell Biology, RWTH Aachen University, Pauwelsstraße, 30, Aachen D-52074, Germany
| | - Liliane S F Leite
- National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentação, São Carlos-SP 13560-970, Brazil
| | - Eva Miriam Buhl
- Institute for Pathology, Electron Microscopy Facility, RWTH Aachen University, Pauwelsstraße, 30, Aachen D-52074, Germany
| | - Stephan Dreschers
- Klinik für Kinder- und Jugendmedizin, RWTH Aachen University, Pauwelsstraße, 30, Aachen D-52074, Germany
| | - Andrij Pich
- DWI-Leibniz-Institute for Interactive Materials, RWTH Aachen University, Forckenbeckstraße 50, Aachen D-52074, Germany
| | - Martin Zenke
- Institute of Biomedical Engineering, Dept. of Cell Biology, RWTH Aachen University, Pauwelsstraße, 30, Aachen D-52074, Germany
| | - Luiz H C Mattoso
- National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentação, São Carlos-SP 13560-970, Brazil
| | - Antonio Sechi
- Institute of Biomedical Engineering, Dept. of Cell Biology, RWTH Aachen University, Pauwelsstraße, 30, Aachen D-52074, Germany
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Giroto AS, do Valle SF, Guimarães GGF, Molina A, Reis HPG, Fernandes DM, Bernardi ACC, Mattoso LHC, Ribeiro C. Tailoring Efficient Materials for NPK All-in-One Granular Fertilization. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c02985] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Amanda S. Giroto
- Embrapa Instrumentation, 1452, XV de Novembro Street, CP: 741, São Carlos, SP 13560-206, Brazil
| | - Stella F. do Valle
- Embrapa Instrumentation, 1452, XV de Novembro Street, CP: 741, São Carlos, SP 13560-206, Brazil
- Federal University of São Carlos, Department of Chemistry, Washington Luiz Highway, km 235, São Carlos, SP 13565-905, Brazil
| | - Gelton G. F. Guimarães
- Agricultural Research and Rural Extension Company of Santa Catarina, 6800 Highway, Antônio Heil, Itajaí, Santa Catarina 88318112, Brazil
| | - Arthur Molina
- Federal University of São Carlos, Department of Chemistry, Washington Luiz Highway, km 235, São Carlos, SP 13565-905, Brazil
| | - Heitor P. G. Reis
- UNESP Botucatu Av. Universitária, 3780 - Altos do Paraíso, Botucatu, SP 18610-034, Brazil
| | - Dirceu M. Fernandes
- UNESP Botucatu Av. Universitária, 3780 - Altos do Paraíso, Botucatu, SP 18610-034, Brazil
| | - Alberto C. C. Bernardi
- Embrapa Pecuária Sudeste, Rod. Washington Luiz, km 234, São Carlos, SP 13560-970, Brazil
| | - Luiz H. C. Mattoso
- Embrapa Instrumentation, 1452, XV de Novembro Street, CP: 741, São Carlos, SP 13560-206, Brazil
| | - Caue Ribeiro
- Embrapa Instrumentation, 1452, XV de Novembro Street, CP: 741, São Carlos, SP 13560-206, Brazil
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Dos Santos DM, Correa DS, Medeiros ES, Oliveira JE, Mattoso LHC. Advances in Functional Polymer Nanofibers: From Spinning Fabrication Techniques to Recent Biomedical Applications. ACS Appl Mater Interfaces 2020; 12:45673-45701. [PMID: 32937068 DOI: 10.1021/acsami.0c12410] [Citation(s) in RCA: 83] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Functional polymeric micro-/nanofibers have emerged as promising materials for the construction of structures potentially useful in biomedical fields. Among all kinds of technologies to produce polymer fibers, spinning methods have gained considerable attention. Herein, we provide a recent review on advances in the design of micro- and nanofibrous platforms via spinning techniques for biomedical applications. Specifically, we emphasize electrospinning, solution blow spinning, centrifugal spinning, and microfluidic spinning approaches. We first introduce the fundamentals of these spinning methods and then highlight the potential biomedical applications of such micro- and nanostructured fibers for drug delivery, tissue engineering, regenerative medicine, disease modeling, and sensing/biosensing. Finally, we outline the current challenges and future perspectives of spinning techniques for the practical applications of polymer fibers in the biomedical field.
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Affiliation(s)
- Danilo M Dos Santos
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970, São Carlos, São Paulo, Brazil
| | - Daniel S Correa
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970, São Carlos, São Paulo, Brazil
| | - Eliton S Medeiros
- Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMAT), Federal University of Paraíba (UFPB), Cidade Universitária, 58.051-900, João Pessoa, Paraiba, Brazil
| | - Juliano E Oliveira
- Department of Engineering, Federal University of Lavras (UFLA), 37200-900, Lavras, Minas Gerais, Brazil
| | - Luiz H C Mattoso
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970, São Carlos, São Paulo, Brazil
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15
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Meira FHA, Resende SF, Monteiro DS, Pereira MC, Mattoso LHC, Faria RC, Afonso AS. A Non‐enzymatic Ag/δ‐FeOOH Sensor for Hydrogen Peroxide Determination using Disposable Carbon‐based Electrochemical Cells. ELECTROANAL 2020. [DOI: 10.1002/elan.202060171] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Flávio H. A. Meira
- Institute of Science, Engineering, and Technology Federal University of Jequitinhonha and Mucuri Valleys,Teófilo Otoni 39803-371 Minas Gerais Brazil
| | - Sayton F. Resende
- Institute of Science, Engineering, and Technology Federal University of Jequitinhonha and Mucuri Valleys,Teófilo Otoni 39803-371 Minas Gerais Brazil
| | - Douglas S. Monteiro
- Institute of Science, Engineering, and Technology Federal University of Jequitinhonha and Mucuri Valleys,Teófilo Otoni 39803-371 Minas Gerais Brazil
| | - Márcio C. Pereira
- Institute of Science, Engineering, and Technology Federal University of Jequitinhonha and Mucuri Valleys,Teófilo Otoni 39803-371 Minas Gerais Brazil
| | - Luiz H. C. Mattoso
- Nanotechnology National Laboratory for Agriculture (LNNA) Embrapa Instrumentação, São Carlos 13560-970 São Paulo Brazil
| | - Ronaldo C. Faria
- Chemistry Department Federal University of São Carlos, CP 676, São Carlos 13565-905 São Paulo Brazil
| | - André S. Afonso
- Institute of Science, Engineering, and Technology Federal University of Jequitinhonha and Mucuri Valleys,Teófilo Otoni 39803-371 Minas Gerais Brazil
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16
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Leite LSF, Ferreira CM, Corrêa AC, Moreira FKV, Mattoso LHC. Scaled-up production of gelatin-cellulose nanocrystal bionanocomposite films by continuous casting. Carbohydr Polym 2020; 238:116198. [PMID: 32299555 DOI: 10.1016/j.carbpol.2020.116198] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 03/17/2020] [Accepted: 03/19/2020] [Indexed: 10/24/2022]
Abstract
In this study, continuous casting is proposed as a suitable approach to scale up the production of gelatin-cellulose nanocrystals (CNCs) bionanocomposites. The processing conditions and bionanocomposite properties were established based on the ζ-potential and gelatin content, and CNCs concentration, respectively. Gelatin film-forming solution at 20 wt% was required for proper continuous casting processing, leading to a productivity of 0.20 m2 film/min, which was at least 1000-fold higher than that of the classical bench casting. The gelatin-CNCs bionanocomposites displayed transparency, flexibility, and improved UV-barrier and thermal properties. Adding only 0.5 wt% of CNCs resulted in an increase of 77 % and 48 % in the tensile strength and Young's modulus of gelatin, respectively. Comparison with previous nanocellulose-based nanocomposites pointed out the relatively superior performance of the gelatin-CNCs bionanocomposites obtained by continuous casting for various applications, including flexible food packaging.
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Affiliation(s)
- Liliane S F Leite
- Federal University of São Carlos, Graduate Program in Materials Science and Engineering (PPGCEM), 13565-905, São Carlos, Brazil; National Nanotechnology Laboratory for Agribusiness, Embrapa Instrumentation, XV de Novembro Street, 1452, São Carlos, SP, 13560-979, Brazil.
| | - Caio M Ferreira
- Department of Materials Engineering, Federal University of São Carlos, Rod. Washington Luis, km 235, São Carlos, SP, 13565-905, Brazil.
| | - Ana C Corrêa
- Federal University of São Carlos, Graduate Program in Materials Science and Engineering (PPGCEM), 13565-905, São Carlos, Brazil; National Nanotechnology Laboratory for Agribusiness, Embrapa Instrumentation, XV de Novembro Street, 1452, São Carlos, SP, 13560-979, Brazil.
| | - Francys K V Moreira
- Department of Materials Engineering, Federal University of São Carlos, Rod. Washington Luis, km 235, São Carlos, SP, 13565-905, Brazil.
| | - Luiz H C Mattoso
- National Nanotechnology Laboratory for Agribusiness, Embrapa Instrumentation, XV de Novembro Street, 1452, São Carlos, SP, 13560-979, Brazil.
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17
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Ferreira FC, Babu RS, de Barros ALF, Raja S, da Conceição LRB, Mattoso LHC. Photoelectric performance evaluation of DSSCs using the dye extracted from different color petals of Leucanthemum vulgare flowers as novel sensitizers. Spectrochim Acta A Mol Biomol Spectrosc 2020; 233:118198. [PMID: 32179440 DOI: 10.1016/j.saa.2020.118198] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 02/22/2020] [Accepted: 02/24/2020] [Indexed: 06/10/2023]
Abstract
In this work, the natural flower extracted dyes containing luteolin were prepared using three different specimens from daisy flowers family (Leucanthemum vulgare), namely yellow daisy, purple daisy and wine daisy, according to the color of its petals. Moreover, DSSCs were fabricated using nanosized titanium dioxide (TiO2) as an anode; for the photocathodes, two different specimens were used: i) graphite electrode and ii) platinum electrode. To recognize the light absorption behavior, the existence of anchoring groups and coloring components of the extracted dyes were determined using absorption spectroscopy. The surface roughness of the photoanodes and cathodes were examined using atomic force microscope (AFM). The photovoltaic performance and efficiency of assembled DSSCs were evaluated to realize the influence of TiO2 photoanodes on interaction of the Leucanthemum vulgare extracted dye molecules with graphite or platinum photocathodes. DSSCs fabricated with platinum cathode show higher conversion efficiency (η) of 0.6%, 0.4% and 0.8% for the yellow daisy, wine daisy and purple daisy, respectively. DSSCs sensitized with daisy wine dye showed highest open-circuit voltage (Voc) of 520 mV and efficiency of 0.79% and 0.88%, for the graphite and platinum cathodes, respectively. These results showed that the DSSCs, using daisy flowers extracts as efficient photosensitizers, are suitable for the fabrication of environmentally safe, inexpensive, clean and renewable energy.
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Affiliation(s)
- F C Ferreira
- Laboratory of Experimental and Applied Physics, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca, Av. Maracanã 229, Rio de Janeiro 20271-110, Brazil
| | - R Suresh Babu
- Laboratory of Experimental and Applied Physics, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca, Av. Maracanã 229, Rio de Janeiro 20271-110, Brazil.
| | - A L F de Barros
- Laboratory of Experimental and Applied Physics, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca, Av. Maracanã 229, Rio de Janeiro 20271-110, Brazil
| | - S Raja
- National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentação, São Carlos, SP 13560-970, Brazil
| | - L R B da Conceição
- Laboratory of Experimental and Applied Physics, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca, Av. Maracanã 229, Rio de Janeiro 20271-110, Brazil
| | - L H C Mattoso
- National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentação, São Carlos, SP 13560-970, Brazil
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18
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Migliorini FL, Teodoro KBR, dos Santos DM, Fonseca FJ, Mattoso LHC, Correa DS. Electrospun nanofibers versus drop casting films for designing an electronic tongue: comparison of performance for monitoring geosmin and 2‐methylisoborneol in water samples. POLYM ADVAN TECHNOL 2020. [DOI: 10.1002/pat.4930] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Fernanda L. Migliorini
- Nanotechnology National Laboratory for Agriculture, Embrapa Instrumentação, São Carlos SP Brazil
| | - Kelcilene B. R. Teodoro
- Nanotechnology National Laboratory for Agriculture, Embrapa Instrumentação, São Carlos SP Brazil
| | - Danilo M. dos Santos
- Nanotechnology National Laboratory for Agriculture, Embrapa Instrumentação, São Carlos SP Brazil
| | - Fernando J. Fonseca
- Departamento de Engenharia de Sistemas Eletrônicos, Polytechnic School, University of São Paulo, São Paulo Brazil
| | - Luiz H. C. Mattoso
- Nanotechnology National Laboratory for Agriculture, Embrapa Instrumentação, São Carlos SP Brazil
| | - Daniel S. Correa
- Nanotechnology National Laboratory for Agriculture, Embrapa Instrumentação, São Carlos SP Brazil
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19
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Miranda KW, Natarelli CVL, Thomazi AC, Ferreira GMD, Frota MM, Bastos MDSR, Mattoso LHC, Oliveira JE. Halochromic Polystyrene Nanofibers Obtained by Solution Blow Spinning for Wine pH Sensing. Sensors (Basel) 2020; 20:E417. [PMID: 31940816 PMCID: PMC7014295 DOI: 10.3390/s20020417] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Revised: 01/04/2020] [Accepted: 01/07/2020] [Indexed: 12/21/2022]
Abstract
Colorimetric sensors developed by the solution blow spinning (SBS) technique have a rapid response to a variation in different physicochemical properties. In this study, polystyrene nanofibrous (PSNF) mats containing the bromothymol blue (BTB) indicator were obtained by SBS for the pH sensing of wine sample. The incorporation of the indicator did not promote changes in fiber diameter but led to the appearance of beads, allowing for the encapsulation of BTB. The halochromic property of BTB was retained in the PSNF material, and the migration tests showed that the indicator mats presented values below the maximum acceptable limit (10 mg dm-2) established by EU Commission Regulation No. 10/2011 for foods with an alcohol content up to 20%. The present study opens the possibility of applying nanostructured materials to innovative food packaging which, through nanosensory zones, change color as a function of the food pH.
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Affiliation(s)
- Kelvi W.E. Miranda
- Graduate Program in Biomaterials Engineering, Federal University of Lavras, Lavras 37200-000, Brazil (C.V.L.N.)
- Nanotechnology National Laboratory for Agriculture, Embrapa Instrumentação, São Carlos 13560-970, Brazil; (A.C.T.); (L.H.C.M.)
| | - Caio V. L. Natarelli
- Graduate Program in Biomaterials Engineering, Federal University of Lavras, Lavras 37200-000, Brazil (C.V.L.N.)
| | - Adriana C. Thomazi
- Nanotechnology National Laboratory for Agriculture, Embrapa Instrumentação, São Carlos 13560-970, Brazil; (A.C.T.); (L.H.C.M.)
| | | | - Maryana M. Frota
- Food Engineering Department, Federal University of Ceara, Fortaleza 60356-000, Brazil;
| | | | - Luiz H. C. Mattoso
- Nanotechnology National Laboratory for Agriculture, Embrapa Instrumentação, São Carlos 13560-970, Brazil; (A.C.T.); (L.H.C.M.)
| | - Juliano E. Oliveira
- Department of Engineering, Federal University of Lavras, Lavras 37200-000, Brazil
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20
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Mercante LA, Andre RS, Schneider R, Mattoso LHC, Correa DS. Free-standing SiO2/TiO2–MoS2 composite nanofibrous membranes as nanoadsorbents for efficient Pb(ii) removal. NEW J CHEM 2020. [DOI: 10.1039/d0nj02561e] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The practical utility of a hybrid material based on flexible free-standing ceramic nanofibers functionalized with MoS2 for heavy metal removal.
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Affiliation(s)
- Luiza A. Mercante
- Nanotechnology National Laboratory for Agriculture
- Embrapa Instrumentação
- São Carlos
- Brazil
- General and Inorganic Chemistry Department
| | - Rafaela S. Andre
- Nanotechnology National Laboratory for Agriculture
- Embrapa Instrumentação
- São Carlos
- Brazil
| | - Rodrigo Schneider
- Nanotechnology National Laboratory for Agriculture
- Embrapa Instrumentação
- São Carlos
- Brazil
- PPGQ, Department of Chemistry
| | - Luiz H. C. Mattoso
- Nanotechnology National Laboratory for Agriculture
- Embrapa Instrumentação
- São Carlos
- Brazil
| | - Daniel S. Correa
- Nanotechnology National Laboratory for Agriculture
- Embrapa Instrumentação
- São Carlos
- Brazil
- PPGQ, Department of Chemistry
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21
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22
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Miranda KWE, Mattoso LHC, Bresolin JD, Hubinger SZ, Medeiros ES, de Oliveira JE. Polystyrene bioactive nanofibers using orange oil as an ecofriendly solvent. J Appl Polym Sci 2018. [DOI: 10.1002/app.47337] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kelvi W. E. Miranda
- Graduate Program in Biomaterials Engineering; Federal University of Lavras (UFLA); Lavras 37200-000 Minas Gerais Brazil
- Nanotechnology National Laboratory for Agriculture (LNNA); Embrapa Instrumentation; São Carlos 13560-970 São Paulo Brazil
| | - Luiz H. C. Mattoso
- Nanotechnology National Laboratory for Agriculture (LNNA); Embrapa Instrumentation; São Carlos 13560-970 São Paulo Brazil
| | - Joana D. Bresolin
- Nanotechnology National Laboratory for Agriculture (LNNA); Embrapa Instrumentation; São Carlos 13560-970 São Paulo Brazil
| | - Silviane Z. Hubinger
- Nanotechnology National Laboratory for Agriculture (LNNA); Embrapa Instrumentation; São Carlos 13560-970 São Paulo Brazil
| | - Eliton S. Medeiros
- Materials and Biosystems Laboratory, Department of Materials Engineering (DEMAT); Federal University of Paraíba (UFPB); João Pessoa 58051-900 João Pessoa Brazil
| | - Juliano E. de Oliveira
- Department of Engineering (DEG); Federal University of Lavras (UFLA); Lavras 37200-000 Minas Gerais Brazil
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23
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Teodoro KBR, Sanfelice RC, Mattoso LHC, Correa DS. Cellulose Whiskers Influence the Morphology and Antibacterial Properties of Silver Nanoparticles Composites. J Nanosci Nanotechnol 2018; 18:4876-4883. [PMID: 29442668 DOI: 10.1166/jnn.2018.15285] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Cellulose, the main component of plant cell walls, is a biopolymer widely used for industrial applications, including, food, paper and textile fabrication. More recently, hybrid materials composed of cellulose nanostructures and metal nanoparticles have been applied in diverse areas such as medical and pharmaceutical applications. In this work, cellulose-silver nanoparticles (AgNPs) hybrid material was synthesized and the influence of cellulose, employed as a stabilizer agent, was investigated. Specifically, cellulose whiskers (CCW) were extracted from commercial cotton fibers by acid hydrolysis route, while the AgNPs were synthesized by reducing silver salt using sodium citrate and/or sodium borohydride in the presence of CCW. The synthesized AgNPs/CCW nanocomposites were characterized in terms of morphology, chemical composition, surface charge and antibacterial properties. The varied synthetic routes generated AgNPs with different morphological characteristics in terms of size, shape and coalescence. The particularity of each sample resulted in distinct behaviors for the tested bacteria. Syntheses employing CCW resulted in AgNPs/CCW nanocomposites with controlled morphology and improved antibacterial effects against E. coli (Gram-negative) and S. aureus (Gram-positive), indicating CCW as a promising compound to be used in the syntheses of silver and other metal nanoparticles with controlled morphology and antibacterial properties.
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Affiliation(s)
- Kelcilene B R Teodoro
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970, São Carlos, SP, Brazil
| | - Rafaela C Sanfelice
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970, São Carlos, SP, Brazil
| | - Luiz H C Mattoso
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970, São Carlos, SP, Brazil
| | - Daniel S Correa
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentaçã, 13560-970, São Carlos, SP, Brazil
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Otoni CG, Avena-Bustillos RJ, Azeredo HMC, Lorevice MV, Moura MR, Mattoso LHC, McHugh TH. Recent Advances on Edible Films Based on Fruits and Vegetables-A Review. Compr Rev Food Sci Food Saf 2017; 16:1151-1169. [DOI: 10.1111/1541-4337.12281] [Citation(s) in RCA: 252] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 05/12/2017] [Accepted: 05/25/2017] [Indexed: 12/24/2022]
Affiliation(s)
- Caio G. Otoni
- Natl. Nanotechnology Laboratory for Agribusiness; Embrapa Instrumentação-Rua XV de Novembro; 1452 São Carlos SP 13560-979 Brazil
- PPG-CEM, Dept. of Materials Engineering; Federal Univ. of São Carlos-Rod. Washington Luis; km 235 São Carlos SP 13565-905 Brazil
| | - Roberto J. Avena-Bustillos
- Healthy Processed Foods Research, Western Regional Research Center; Agricultural Research Service; USDA-800 Buchanan St. Albany CA 94710 USA
| | | | - Marcos V. Lorevice
- Natl. Nanotechnology Laboratory for Agribusiness; Embrapa Instrumentação-Rua XV de Novembro; 1452 São Carlos SP 13560-979 Brazil
- PPGQ, Dept. of Chemistry; Federal Univ. of São Carlos-Rod. Washington Luis; km 235 São Carlos SP 13565-905 Brazil
| | - Márcia R. Moura
- Dept. of Physics and Chemistry; FEIS; São Paulo State Univ.-Av. Brasil, 56 Ilha Solteira SP 15385-000 Brazil
| | - Luiz H. C. Mattoso
- Natl. Nanotechnology Laboratory for Agribusiness; Embrapa Instrumentação-Rua XV de Novembro; 1452 São Carlos SP 13560-979 Brazil
- PPG-CEM, Dept. of Materials Engineering; Federal Univ. of São Carlos-Rod. Washington Luis; km 235 São Carlos SP 13565-905 Brazil
| | - Tara H. McHugh
- Healthy Processed Foods Research, Western Regional Research Center; Agricultural Research Service; USDA-800 Buchanan St. Albany CA 94710 USA
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Mercante LA, Facure MHM, Locilento DA, Sanfelice RC, Migliorini FL, Mattoso LHC, Correa DS. Solution blow spun PMMA nanofibers wrapped with reduced graphene oxide as an efficient dye adsorbent. NEW J CHEM 2017. [DOI: 10.1039/c7nj01703k] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Composite nanofiber membranes of PMMA-rGO serve as promising materials for effective adsorption of dye pollutants from contaminated water.
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Affiliation(s)
- Luiza A. Mercante
- Nanotechnology National Laboratory for Agriculture (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
- PPG-CEM
| | - Murilo H. M. Facure
- Nanotechnology National Laboratory for Agriculture (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
- PPGQ
| | - Danilo A. Locilento
- Nanotechnology National Laboratory for Agriculture (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
- PPGQ
| | - Rafaela C. Sanfelice
- Departamento de Engenharia Química
- Instituto de Ciências Tecnológicas e Exatas – ICTE
- Universidade Federal do Triângulo Mineiro – UFTM
- Uberaba
- Brazil
| | - Fernanda L. Migliorini
- Nanotechnology National Laboratory for Agriculture (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
| | - Luiz H. C. Mattoso
- Nanotechnology National Laboratory for Agriculture (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
- PPG-CEM
| | - Daniel S. Correa
- Nanotechnology National Laboratory for Agriculture (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
- PPGQ
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Nascimento DWS, de Moura MR, Mattoso LHC, Aouada FA. Hybrid Biodegradable Hydrogels Obtained from Nanoclay and Carboxymethylcellulose Polysaccharide: Hydrophilic, Kinetic, Spectroscopic and Morphological Properties. J Nanosci Nanotechnol 2017; 17:821-827. [PMID: 29634176 DOI: 10.1166/jnn.2017.12664] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this paper, series of novel nanocomposite hydrogels based on polyacrylamide (PAAm), carboxymethylcellulose (CMC) and nanoclay were synthesized. Hydrophilic, kinetic, spectroscopic and morphological properties were investigated as function of their constituents. Spectroscopic properties confirmed the obtaining of the nanocomposites. It was also observed that the nanocomposites have walls of pores with a more rugged morphology compared with the morphology of the hydrogel without clay, contributing to repel the water molecules. Besides, the results showed that the velocity and quantity of water uptake may be controlled by adjusting of matrix rigidity, i.e., nanoclay content into polymeric matrix. This behavior is required to future application in agriculture fields, specifically as carrier vehicle in controlled release of agrochemicals. Thus, these nanocomposites have technological application.
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Sasaki RS, Mattoso LHC, de Moura MR. New Edible Bionanocomposite Prepared by Pectin and Clove Essential Oil Nanoemulsions. J Nanosci Nanotechnol 2016; 16:6540-6544. [PMID: 27427749 DOI: 10.1166/jnn.2016.11702] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Nanocomposites are being extremely investigated to provide packaging with interesting characteristics for packages. Because of essential oils' natural occurrence and antibacterial activity, they are considered as an alternative for synthetic additives in the food industry. In this paper, we studied an edible bionanocomposite film made up of pectin and clove essential oil nanoemulsion for application as edible package. Mechanical properties, water vapor permeability (WVP), and antibacterial activity were analyzed. From mechanical and WVP analyses, we noticed an interesting improvement in film properties. In the antibacterial activity test, disk diffusion was used to assess the inhibition zones of Escherichia coli and Staphylococcus aureus. With these results, we concluded that the most interesting results were promoted by smaller nanodroplets (diameter of approximately 142 nm).
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Santos ASF, Pereira-da-Silva MA, Oliveira JE, Mattoso LHC, Medeiros ES. Accelerated Sonochemical Extraction of Cellulose Nanowhiskers. J Nanosci Nanotechnol 2016; 16:6535-6539. [PMID: 27427748 DOI: 10.1166/jnn.2016.11039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Studies on sonochemical hydrolysis of cellulose have been suggested as an alternative route to obtaining cellulose nanoparticles. In this work, the potential use of acid hydrolysis assisted by sonication to obtain cellulose whiskers was studied. Parameters such as acid concentration, hydrolysis time and temperature were investigated to evaluate their effect on the morphological properties of the nanowhiskers, as compared to the conventional extraction process by acid hydrolysis with mechanical stirring. Morphology and degree of crystallinity of the nanowhiskers were studied by atomic force microscopy (AFM) and X-ray diffraction (XRD). Results indicated that the extraction time was reduced from about 45 min to less than 3 min using the same acid concentration and temperature used in conventional acid hydrolysis treatment. Likewise, it was possible, within the range of 30 min, to extract whiskers at room temperature or using half the concentration of acid by raising the temperature to about 80 degrees C. These are promising results towards a more economically viable and ecologically friendly extraction procedure used to obtain cellulose nanowhiskers, since both extraction time and acid concentration, used in nanowhisker extraction, were significantly reduced by replacing mechanical with sonochemical stirring.
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Bortolin A, Serafim AR, Aouada FA, Mattoso LHC, Ribeiro C. Macro- and Micronutrient Simultaneous Slow Release from Highly Swellable Nanocomposite Hydrogels. J Agric Food Chem 2016; 64:3133-40. [PMID: 27043128 DOI: 10.1021/acs.jafc.6b00190] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Clay-loaded hydrogels have been arousing great interest from researchers and academics due to their unique properties and broad applicability range. Here we developed hydrogel-based nanocomposites intended for slow/controlled release of macro- and micronutrients into independent or concurrent systems. The produced nanocomposites underwent a hydrolysis treatment that improved their physicochemical properties. We obtained materials capable of absorbing water contents 5000 times greater than their weights, an outcome that makes them promising, particularly if compared with commercially available materials. Though swelling degree was affected by the presence of calcium montmorillonite (MMt), MMt has increased nutrient (urea and boron) loading capacity and, as a consequence of its interaction with the studied nutrients, has led to a slower release behavior. By evaluating the simultaneous release behavior, we observed that both the ionic (sodium octaborate) and the nonionic (urea) sources competed for the same active sites within the nanocomposites as suggested by the decreased loading and release values of both nutrients when administrated simultaneously. Because of its great swelling degree, higher than 2000 times in water, the nanocomposites formulated with high MMt contents (approximately 50.0% wt) as well as featuring high loading capacity and individual (approximately 74.2 g of urea g(-1) of nanocomposite and 7.29 g of boron g(-1) of nanocomposite) and simultaneous release denote interesting materials for agricultural applications (e.g., carriers for nutrient release).
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Affiliation(s)
- Adriel Bortolin
- National Nanotechnology Laboratory for Agribusiness, EMBRAPA-CNPDIA - Rua XV de Novembro, 1452, São Carlos, SP 13560-970, Brazil
- PPGQ, Department of Chemistry, Federal University of São Carlos - Rodovia , Washington Luís, Km 235, São Carlos, SP 13566-905, Brazil
| | - André R Serafim
- National Nanotechnology Laboratory for Agribusiness, EMBRAPA-CNPDIA - Rua XV de Novembro, 1452, São Carlos, SP 13560-970, Brazil
| | - Fauze A Aouada
- National Nanotechnology Laboratory for Agribusiness, EMBRAPA-CNPDIA - Rua XV de Novembro, 1452, São Carlos, SP 13560-970, Brazil
| | - Luiz H C Mattoso
- National Nanotechnology Laboratory for Agribusiness, EMBRAPA-CNPDIA - Rua XV de Novembro, 1452, São Carlos, SP 13560-970, Brazil
- PPGQ, Department of Chemistry, Federal University of São Carlos - Rodovia , Washington Luís, Km 235, São Carlos, SP 13566-905, Brazil
| | - Caue Ribeiro
- National Nanotechnology Laboratory for Agribusiness, EMBRAPA-CNPDIA - Rua XV de Novembro, 1452, São Carlos, SP 13560-970, Brazil
- PPGQ, Department of Chemistry, Federal University of São Carlos - Rodovia , Washington Luís, Km 235, São Carlos, SP 13566-905, Brazil
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Sanfelice RC, Pavinatto A, Gonçalves VC, Correa DS, Mattoso LHC, Balogh DT. Synthesis of a nanocomposite containing a water-soluble polythiophene derivative and gold nanoparticles. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/polb.24032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Rafaela C. Sanfelice
- Embrapa Instrumentação; Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA); São Carlos SP 13560-970 Brazil
| | - Adriana Pavinatto
- Embrapa Instrumentação; Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA); São Carlos SP 13560-970 Brazil
| | - Vanessa C. Gonçalves
- IFSP - Instituto Federal de Educação; Ciência e Tecnologia de São Paulo; Matão SP Brazil
| | - Daniel S. Correa
- Embrapa Instrumentação; Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA); São Carlos SP 13560-970 Brazil
| | - Luiz H. C. Mattoso
- Embrapa Instrumentação; Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA); São Carlos SP 13560-970 Brazil
| | - Débora T. Balogh
- Instituto de Física de São Carlos, Universidade de São Paulo; São Carlos SP 13560-970 Brazil
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Scagion VP, Mercante LA, Sakamoto KY, Oliveira JE, Fonseca FJ, Mattoso LHC, Ferreira MD, Correa DS. An electronic tongue based on conducting electrospun nanofibers for detecting tetracycline in milk samples. RSC Adv 2016. [DOI: 10.1039/c6ra21326j] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Impedimetric e-tongue based on conducting electrospun nanofibers provides a rapid and sensitive means for the detection of tetracycline residues in milk.
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Affiliation(s)
- Vanessa P. Scagion
- National Laboratory for Nanotechnology in Agribusiness (LNNA)
- Embrapa Instrumentação
- São Carlos
- Brazil
- Center for Exact Sciences and Technology
| | - Luiza A. Mercante
- National Laboratory for Nanotechnology in Agribusiness (LNNA)
- Embrapa Instrumentação
- São Carlos
- Brazil
| | - Karine Y. Sakamoto
- National Laboratory for Nanotechnology in Agribusiness (LNNA)
- Embrapa Instrumentação
- São Carlos
- Brazil
- Center for Exact Sciences and Technology
| | - Juliano E. Oliveira
- Materials Engineering
- Engineering Department
- Federal University of Lavras (UFLA)
- Lavras
- Brazil
| | | | - Luiz H. C. Mattoso
- National Laboratory for Nanotechnology in Agribusiness (LNNA)
- Embrapa Instrumentação
- São Carlos
- Brazil
| | - Marcos D. Ferreira
- National Laboratory for Nanotechnology in Agribusiness (LNNA)
- Embrapa Instrumentação
- São Carlos
- Brazil
- Center for Exact Sciences and Technology
| | - Daniel S. Correa
- National Laboratory for Nanotechnology in Agribusiness (LNNA)
- Embrapa Instrumentação
- São Carlos
- Brazil
- Center for Exact Sciences and Technology
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Souza MA, Oliveira JE, Medeiros ES, Glenn GM, Mattoso LHC. Controlled Release of Linalool Using Nanofibrous Membranes of Poly(lactic acid) Obtained by Electrospinning and Solution Blow Spinning: A Comparative Study. J Nanosci Nanotechnol 2015; 15:5628-36. [PMID: 26369129 DOI: 10.1166/jnn.2015.9692] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The controlled-release of natural plant oils such as linalool is of interest in therapeutics, cosmetics, and antimicrobial and larvicidal products. The present study reports the release characteristics of linalool encapsulated at three concentrations (10, 15 and 20 wt.%) in poly(lactic acid) nanofibrous membranes produced by electrospinning and solution blow spinning (SBS) as well as the effect of linalool on fiber morphology and structural properties. PLA nanofibrous membranes were characterized by Scanning Electron Microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and contact angle measurements. The average diameters of the electrospun and solution blow spun nanofibers were similar, ranging from 176 to 240 nm. Linalool behaved as a plasticizer to PLA decreasing the glass transition temperature (Tg), melting point (Tm) and crystallization temperature (TC) of PLA. Curves of the release of linalool at 35 °C were non-linear, showing a clear biphasic pattern consistent with one or more Fickian release components. The time required to release 50% of linalool (t1/2) decreased with increasing linalool concentration. The range in t1/2 values for SBS nanofibers was higher (291-1645s) than the t1/2 values for electrospun fibers (76-575s).
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Manzoli A, Shimizu FM, Mercante LA, Paris EC, Oliveira ON, Correa DS, Mattoso LHC. Layer-by-layer fabrication of AgCl-PANI hybrid nanocomposite films for electronic tongues. Phys Chem Chem Phys 2015; 16:24275-81. [PMID: 25298297 DOI: 10.1039/c4cp04150j] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The fabrication of nanostructured films with tailored properties is essential for many applications, particularly with materials such as polyaniline (PANI) whose electrical characteristics may be easily tuned. In this study we report the one-step synthesis of AgCl-PANI nanocomposites that could form layer-by-layer (LbL) films with poly(sodium 4-styrenesulfonate) (PSS) and be used for electronic tongues (e-tongues). The first AgCl-PANI layer was adsorbed on a quartz substrate according to a nucleation-and-growth mechanism explained using the Johnson-Mehl-Avrami (JMA) model, revealing a 3D film growth confirmed by atomic force microscopy (AFM) measurements for the AgCl-PANI/PSS LbL films. In contrast to conventional PANI-containing films, the AgCl-PANI/PSS LbL films deposited on interdigitated electrodes exhibited electrical resistance that was practically unaffected by changes in pH from 4 to 9, and therefore these films can be used in e-tongues for both acidic and basic media. With a sensor array made of AgCl-PANI/PSS LbL films with different numbers of bilayers, we demonstrated the suitability of the AgCl-PANI nanocomposite for an e-tongue capable of clearly discriminating the basic tastes from salt, acid and umami solutions. Significantly, the hybrid AgCl-PANI nanocomposite is promising for any application in which PANI de-doping at high pH is to be avoided.
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Affiliation(s)
- Alexandra Manzoli
- National Laboratory for Nanotechnology in Agribusiness (LNNA), Embrapa Instrumentação, 13560-970, São Carlos, SP, Brazil.
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Mercante LA, Pavinatto A, Iwaki LEO, Scagion VP, Zucolotto V, Oliveira ON, Mattoso LHC, Correa DS. Electrospun polyamide 6/poly(allylamine hydrochloride) nanofibers functionalized with carbon nanotubes for electrochemical detection of dopamine. ACS Appl Mater Interfaces 2015; 7:4784-90. [PMID: 25644325 DOI: 10.1021/am508709c] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The use of nanomaterials as an electroactive medium has improved the performance of bio/chemical sensors, particularly when synergy is reached upon combining distinct materials. In this paper, we report on a novel architecture comprising electrospun polyamide 6/poly(allylamine hydrochloride) (PA6/PAH) nanofibers functionalized with multiwalled carbon nanotubes, used to detect the neurotransmitter dopamine (DA). Miscibility of PA6 and PAH was sufficient to form a single phase material, as indicated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), leading to nanofibers with no beads onto which the nanotubes could adsorb strongly. Differential pulse voltammetry was employed with indium tin oxide (ITO) electrodes coated with the functionalized nanofibers for the selective electrochemical detection of dopamine (DA), with no interference from uric acid (UA) and ascorbic acid (AA) that are normally present in biological fluids. The response was linear for a DA concentration range from 1 to 70 μmol L(-1), with detection limit of 0.15 μmol L(-1) (S/N = 3). The concepts behind the novel architecture to modify electrodes can be potentially harnessed in other electrochemical sensors and biosensors.
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Affiliation(s)
- Luiza A Mercante
- National Laboratory for Nanotechnology in Agribusiness (LNNA), Embrapa Instrumentation , 13560-970 São Carlos, São Paulo, Brazil
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Andre RS, Pavinatto A, Mercante LA, Paris EC, Mattoso LHC, Correa DS. Improving the electrochemical properties of polyamide 6/polyaniline electrospun nanofibers by surface modification with ZnO nanoparticles. RSC Adv 2015. [DOI: 10.1039/c5ra15588f] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
ZnO nanoparticles adsorbed onto electrospun nanofiber surfaces improve the electron transfer kinetics and increase the electrode electroactive area. The modified electrodes can be a potential platform for electrochemical applications.
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Affiliation(s)
- Rafaela S. Andre
- National Laboratory for Nanotechnology in Agribusiness (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
- Center for Exact Sciences and Technology
| | - Adriana Pavinatto
- National Laboratory for Nanotechnology in Agribusiness (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
| | - Luiza A. Mercante
- National Laboratory for Nanotechnology in Agribusiness (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
| | - Elaine C. Paris
- National Laboratory for Nanotechnology in Agribusiness (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
- Center for Exact Sciences and Technology
| | - Luiz H. C. Mattoso
- National Laboratory for Nanotechnology in Agribusiness (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
- Center for Exact Sciences and Technology
| | - Daniel S. Correa
- National Laboratory for Nanotechnology in Agribusiness (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
- Center for Exact Sciences and Technology
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de Britto D, de Moura MR, Aouada FA, Pinola FG, Lundstedt LM, Assis OBG, Mattoso LHC. Entrapment characteristics of hydrosoluble vitamins loaded into chitosan and N,N,N-trimethyl chitosan nanoparticles. Macromol Res 2014. [DOI: 10.1007/s13233-014-2176-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Roque AP, Mercante LA, Scagion VP, Oliveira JE, Mattoso LHC, De Boni L, Mendonca CR, Correa DS. Fluorescent PMMA/MEH-PPV electrospun nanofibers: Investigation of morphology, solvent, and surfactant effect. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/polb.23574] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Aline P. Roque
- Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA), Embrapa Instrumentação; 13560-970 São Carlos São Paulo Brazil
| | - Luiza A. Mercante
- Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA), Embrapa Instrumentação; 13560-970 São Carlos São Paulo Brazil
| | - Vanessa P. Scagion
- Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA), Embrapa Instrumentação; 13560-970 São Carlos São Paulo Brazil
- Centro de Ciências Exatas e de Tecnologia; Universidade Federal de São Carlos (UFSCar); 13565-905 São Carlos São Paulo Brazil
| | - Juliano E. Oliveira
- Departamento de Engenharia de Materiais (DEMAT); Universidade Federal da Paraíba (UFPB); 58051-900 João Pessoa Paraíba Brazil
| | - Luiz H. C. Mattoso
- Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA), Embrapa Instrumentação; 13560-970 São Carlos São Paulo Brazil
| | - Leonardo De Boni
- Instituto de Física de São Carlos; Universidade de São Paulo (USP); 13560-970 São Carlos São Paulo Brazil
| | - Cleber R. Mendonca
- Instituto de Física de São Carlos; Universidade de São Paulo (USP); 13560-970 São Carlos São Paulo Brazil
| | - Daniel S. Correa
- Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA), Embrapa Instrumentação; 13560-970 São Carlos São Paulo Brazil
- Centro de Ciências Exatas e de Tecnologia; Universidade Federal de São Carlos (UFSCar); 13565-905 São Carlos São Paulo Brazil
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Siqueira MC, Coelho GF, de Moura MR, Bresolin JD, Hubinger SZ, Marconcini JM, Mattoso LHC. Evaluation of antimicrobial activity of silver nanoparticles for carboxymethylcellulose film applications in food packaging. J Nanosci Nanotechnol 2014; 14:5512-5517. [PMID: 24758059 DOI: 10.1166/jnn.2014.8991] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this study, silver nanoparticles were prepared and incorporated into carboxymethylcellulose films to evaluate the antimicrobial activity for food packaging applications. The techniques carried out for material characterization were: infrared spectroscopy and thermal analysis for the silver nanoparticles and films, as well as particle size distribution for the nanoparticles and water vapor permeability for the films. The antimicrobial activity of silver nanoparticles prepared by casting method was investigated. The minimum inhibitory concentration (MIC) value of the silver nanoparticles to test Gram-positive (Enterococcus faecalis) and Gram-negative (Escherichia coli) microorganisms was carried out by the serial dilution technique, tested in triplicate to confirm the concentration used. The results were developed using the Mcfarland scale which indicates that the presence or absence of turbidity tube demonstrates the inhibition of bacteria in relation to the substance inoculated. It was found that the silver nanoparticles inhibited the growth of the tested microorganisms. The carboxymethylcellulose film embedded with silver nanoparticles showed the best antimicrobial effect against Gram-positive (E. faecalis) and Gram-negative (E. coli) bacteria (0.1 microg cm(-3)).
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Bortolin A, Aouada FA, Mattoso LHC, Ribeiro C. Nanocomposite PAAm/methyl cellulose/montmorillonite hydrogel: evidence of synergistic effects for the slow release of fertilizers. J Agric Food Chem 2013; 61:7431-7439. [PMID: 23822729 DOI: 10.1021/jf401273n] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this work, we synthesized a novel series of hydrogels composed of polyacrylamide (PAAm), methylcellulose (MC), and calcic montmorillonite (MMt) appropriate for the controlled release of fertilizers, where the components presented a synergistic effect, giving very high fertilizer loading in their structure. The synthesized hydrogel was characterized in relation to morphological, hydrophilic, spectroscopic, structural, thermal, and kinetic properties. After those characterizations, the application potential was verified through sorption and desorption studies of a nitrogenated fertilizer, urea (CO(NH2)2). The swelling degree results showed that the clay loading considerably reduces the water absorption capability; however, the hydrolysis process favored the urea adsorption in the hydrogel nanocomposites, increasing the load content according to the increase of the clay mass. The FTIR spectra indicated that there was incorporation of the clay with the polymeric matrix of the hydrogel and that incorporation increased the water absorption speed (indicated by the kinetic constant k). By an X-ray diffraction technique, good nanodispersion (intercalation) and exfoliation of the clay platelets in the hydrogel matrix were observed. Furthermore, the presence of the montmorillonite in the hydrogel caused the system to liberate the nutrient in a more controlled manner than that with the neat hydrogel in different pH ranges. In conclusion, excellent results were obtained for the controlled desorption of urea, highlighting the hydrolyzed hydrogels containing 50% calcic montmorillonite. This system presented the best desorption results, releasing larger amounts of nutrient and almost 200 times slower than pure urea, i.e., without hydrogel. The total values of nutrients present in the system show that this material is potentially viable for application in agriculture as a nutrient carrier vehicle.
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Affiliation(s)
- Adriel Bortolin
- Departamento de Química, Universidade Federal de São Carlos , 13565-905, São Carlos, SP, Brazil
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Moreira FKV, De Camargo LA, Marconcini JM, Mattoso LHC. Nutraceutically inspired pectin-Mg(OH)₂ nanocomposites for bioactive packaging applications. J Agric Food Chem 2013; 61:7110-7119. [PMID: 23799648 DOI: 10.1021/jf402110g] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This paper reports on the development of bioactive edible films based on pectin as a dietary matrix and magnesium hydroxide (Mg(OH)2) nanoplates as a reinforcing filler. Nanocomposites of high-methoxyl (HM) and low-methoxyl (LM) pectins were prepared using the casting method at concentrations of Mg(OH)2 ranging from 0.5 to 5 wt %. Atomic force microscopy and FTIR spectroscopy were employed to characterize the nanocomposite structure. The tensile properties and thermal stability of the nanocomposites were also examined to ascertain the effect of Mg(OH)2 inclusion and degree of methoxylation. The results provided evidence that the Mg(OH)2 nanoplates were uniformly dispersed and interacted strongly with the film matrix. The mechanical and thermal properties were significantly improved in the nanocomposite films compared to the control. Mg(OH)2 nanoplates were more effective in improving properties of LM pectin. Preliminary migration studies using arugula leaves confirmed that pectin-Mg(OH)2 nanocomposites can release magnesium hydroxide by contact, demonstrating their potential for magnesium supplementation in bioactive packaging.
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Affiliation(s)
- Francys K V Moreira
- National Laboratory of Nanotechnology for Agribusiness (LNNA), Embrapa Instrumentation (CNPDIA), São Carlos (SP), Brazil
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de Moura MR, Aouada FA, Mattoso LHC, Zucolotto V. Hybrid nanocomposites containing carboxymethylcellulose and silver nanoparticles. J Nanosci Nanotechnol 2013; 13:1946-1950. [PMID: 23755626 DOI: 10.1166/jnn.2013.7117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Silver nanoparticles have high temperature stability and low volatility, and at the nanoscale are known to be an effective antifungal and antimicrobial agent. The present investigation involves the synthesis of silver nanoparticle/carboxymethylcellulose nanocomposites. The nanoparticles synthesised in this study had sizes in the range of 100 and 40 nm. The nanocomposites formed by a combination of metallic nanoparticles and carboxymethylcellulose were characterised by contact angle measurements, solubility tests, thermal and mechanical analyses, and morphological images. Improvements in the hydrophobic properties were observed with inclusion of the nanoparticles in the nanocomposites, with the best results occurring after the addition of 40 nm nanoparticles in a carboxymethylcellulose matrix. The silver nanoparticles tend to occupy the empty spaces in the pores of the carboxymethylcellulose matrix, inducing the collapse of these pores and thereby improving the tensile and barrier properties of the film.
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Affiliation(s)
- Márcia R de Moura
- Laboratório Nacional de Nanotecnologia Para o Agronegócio (LNNA), EMBRAPA-CNPDIA, São Carlos/SP 13560-970, Brazil
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Pereira MM, Raposo NRB, Brayner R, Teixeira EM, Oliveira V, Quintão CCR, Camargo LSA, Mattoso LHC, Brandão HM. Cytotoxicity and expression of genes involved in the cellular stress response and apoptosis in mammalian fibroblast exposed to cotton cellulose nanofibers. Nanotechnology 2013; 24:075103. [PMID: 23358497 DOI: 10.1088/0957-4484/24/7/075103] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Cellulose nanofibers (CNF) have mechanical properties that make them very attractive for applications in the construction of polymeric matrices, drug delivery and tissue engineering. However, little is known about their impact on mammalian cells. The objective of this study was to evaluate the cytotoxicity of CNF and their effect on gene expression of fibroblasts cultured in vitro. The morphology of CNF was analyzed by transmission electron microscopy and the surface charge by Zeta potential. Cell viability was analyzed by flow cytometry assay and gene expression of biomarkers focused on cell stress response such as Heat shock protein 70.1 (HSP70.1) and Peroxiredoxin 1 (PRDX1) and apoptosis as B-cell leukemia (BCL-2) and BCL-2 associated X protein (BAX) by RT-PCR assay. Low concentrations of CNF (0.02-100 μg ml(-1)) did not cause cell death; however, at concentrations above 200 μg ml(-1), the nanofibers significantly decreased cell viability (86.41 ± 5.37%). The exposure to high concentrations of CNF (2000 and 5000 μg ml(-1)) resulted in increased HSP70.1, PRDX1 and BAX gene expression. The current study concludes that, under the conditions tested, high concentrations (2000 and 5000 μg ml(-1)) of CNF cause decreased cell viability and affect the expression of stress- and apoptosis-associated molecular markers.
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Affiliation(s)
- M M Pereira
- Nucleus of Analytical Identification and Quantification (NIQUA), Department of Pharmaceutical Sciences, Pharmacy Faculty, Federal University of Juiz de Fora, Juiz de Fora, Brazil.
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Martelli MR, Barros TT, de Moura MR, Mattoso LHC, Assis OBG. Effect of Chitosan Nanoparticles and Pectin Content on Mechanical Properties and Water Vapor Permeability of Banana Puree Films. J Food Sci 2012; 78:N98-104. [DOI: 10.1111/j.1750-3841.2012.03006.x] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bortolin A, Aouada FA, Longo E, Mattoso LHC. Investigação do processo de absorção de água de hidrogéis de polissacarídeo: efeito da carga iônica, presença de sais, concentrações de monômero e polissacarídeo. Polímeros 2012. [DOI: 10.1590/s0104-14282012005000046] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Neste trabalho foi reportada a caracterização de hidrogéis constituídos por metilcelulose (MC) e poliacrilamida (PAAm) preparados pelo processo de reticulação cruzada. As propriedades espectroscópicas e morfológicas foram investigadas por espectroscopia no infravermelho com transformada de Fourier e microscopia eletrônica de varredura, respectivamente. O efeito da carga iônica, presença de sais, concentrações de monômero AAm e polissacarídeo MC na absorção de água e nas propriedades cinéticas dos hidrogéis foi detalhadamente investigado. Os resultados indicaram que o decréscimo da concentração de MC ou aumento da concentração de AAm, carga iônica do contra-íon do sal de cloreto e a presença de fertilizante no meio externo de intumescimento provocaram diminuição significativa na absorção de água dos hidrogéis. O mecanismo de absorção de água dos hidrogéis de PAAm-MC em água seguiu o modelo de difusão Fickiana; já o mecanismo dos hidrogéis intumescidos em sais (cloreto ou fertilizante) seguiu o modelo de transporte anômalo. Pela alta e rápida absorção de água, as matrizes porosas e tridimensionais compostas por PAAm e MC podem em potencial ser aplicadas na agricultura como veículos carreadores.
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Costa RGF, Ribeiro C, Mattoso LHC. Study of the effect of rutile/anatase TiO2nanoparticles synthesized by hydrothermal route in electrospun PVA/TiO2nanocomposites. J Appl Polym Sci 2012. [DOI: 10.1002/app.38031] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Costa RGF, Oliveira JED, Paula GFD, Picciani PHDS, Medeiros ESD, Ribeiro C, Mattoso LHC. Eletrofiação de Polímeros em Solução: parte I: fundamentação Teórica. Polímeros 2012. [DOI: 10.1590/s0104-14282012005000026] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A técnica de eletrofiação é conhecida desde a década de 1930, porém, somente com o advento das novas aplicações da nanotecnologia esta importante técnica foi re-descoberta. As potencialidades de nanofibras, de tamanhos da ordem de 50 a 500 nm e com extensão micrométrica, têm sido investigadas para diferentes materiais, com resultados promissores em diferentes aplicações. Nesta primeira parte, este trabalho de revisão propôs-se a detalhar as bases fundamentais do processo de eletrofiação. São descritas as influências das variáveis de processo, como campo aplicado, distância de trabalho, velocidade de rotação do coletor e de injeção da solução. Variáveis associadas ao sistema, como tipo de solvente e polímero de interesse, também são discutidas.
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Moreira FKV, Marconcini JM, Mattoso LHC. Analysis of the influence of composition and processing parameters on the mechanical properties of biodegradable starch/pectin blends. Polym Bull (Berl) 2012. [DOI: 10.1007/s00289-012-0750-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Oliveira JE, Zucolotto V, Mattoso LHC, Medeiros ES. Multi-walled carbon nanotubes and poly(lactic acid) nanocomposite fibrous membranes prepared by solution blow spinning. J Nanosci Nanotechnol 2012; 12:2733-41. [PMID: 22755116 DOI: 10.1166/jnn.2012.5730] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Nanocomposite fibers based on multi-walled carbon nanotubes (MWCNT) and poly(lactic acid) (PLA) were prepared by solution blow spinning (SBS). Fiber morphology was characterized by scanning electron microscopy (SEM) and optical microscopy (OM). Electrical, thermal, surface and crystalline properties of the spun fibers were evaluated, respectively, by conductivity measurements (4-point probe), thermogravimetric analyses (TGA), differential scanning calorimetry (DSC), contact angle and X-ray diffraction (XRD). OM analysis of the spun mats showed a poor dispersion of MWCNT in the matrix, however dispersion in solution was increased during spinning where droplets of PLA in solution loaded with MWCNT were pulled by the pressure drop at the nozzle, producing PLA fibers filled with MWCNT. Good electrical conductivity and hydrophobicity can be achieved at low carbon nanotube contents. When only 1 wt% MWCNT was added to low-crystalline PLA, surface conductivity of the composites increased from 5 x 10(-8) to 0.46 S/cm. Addition of MWCNT can slightly influence the degree of crystallinity of PLA fibers as studied by XRD and DSC. Thermogravimetric analyses showed that MWCNT loading can decrease the onset degradation temperature of the composites which was attributed to the catalytic effect of metallic residues in MWCNT. Moreover, it was demonstrated that hydrophilicity slightly increased with an increase in MWCNT content. These results show that solution blow spinning can also be used to produce nanocomposite fibers with many potential applications such as in sensors and biosensors.
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Affiliation(s)
- Juliano E Oliveira
- PPGCEM, Departamento de Engenharia de Materials (DEMA), Universidade Federal de São Carlos (UFSCAR), Rodovia Washington Luis, km 235 - Monjolinho, 13.565-905 São Carlos-SP, Brazil
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Lorevice MV, de Moura MR, Aouada FA, Mattoso LHC. Development of novel guava puree films containing chitosan nanoparticles. J Nanosci Nanotechnol 2012; 12:2711-2717. [PMID: 22755113 DOI: 10.1166/jnn.2012.5716] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
One of the overall goals of industries is to use packages that do not cause environmental problems at disposal time, but that have the same properties as the conventional ones. The goal of this study is to synthesize edible films based on hydroxypropyl methylcellulose (HPMC) with guava puree and chitosan (CS) nanoparticles. This was divided into two stages, the first is the synthesis of chitosan nanoparticles and the second is the production of the films. For the nanoparticles, average size and zeta potential measurements were performed. The characterizations of mechanical and thermal properties, solubility and water vapor permeability tests were conducted in the films. It was observed that when the nanoparticles were added to HPMC and guava puree films, they improved their mechanical and thermal properties, as well as decreased the films solubility and permeability. The potential application of the films prepared would be in edible films with flavor and odor to extend the shelf life of products.
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