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Ye X, Li J, Gao D, Ma P, Wu Q, Song D. A Dual-Mode Fluorescent Nanoprobe for the Detection and Visual Screening of Pathogenic Bacterial Spores. Anal Chem 2024; 96:6012-6020. [PMID: 38564412 DOI: 10.1021/acs.analchem.4c00443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Bacterial vegetative cells turn into metabolically dormant spores in certain environmental situations. Once suitable conditions trigger the germination of spores belonging to the pathogenic bacterial category, public safety and environmental hygiene will be threatened, and lives will even be endangered when encountering fatal ones. Instant identification of pathogenic bacterial spores remains a challenging task, since most current approaches belonging to complicated biological methods unsuitable for onsite sensing or emerging alternative chemical techniques are still inseparable from professional instruments. Here we developed a polychromatic fluorescent nanoprobe for ratiometric detection and visual inspection of the pathogenic bacterial spore biomarker, dipicolinic acid (DPA), realizing rapidly accurate screening of pathogenic bacterial spores such as Bacillus anthracis spores. The nanoprobe is made of aminoclay-coated silicon nanoparticles and functionalized with europium ions, exhibiting selective and sensitive response toward DPA and Bacillus subtilis spores (simulants for Bacillus anthracis spores) with excellent linearity. The proposed sensing strategy allowing spore determination of as few as 0.3 × 105 CFU/mL within 10 s was further applied to real environmental sample detection with good accuracy and reliability. Visual quantitative determination can be achieved by analyzing the RGB values of the corresponding test solution color via a color recognition APP on a smartphone. Different test samples can be photographed at the same time, hence the efficient accomplishment of examining bulk samples within minutes. Potentially employed in various on-site sensing occasions, this strategy may develop into a powerful means for distinguishing hazardous pathogens to facilitate timely and proper actions of dealing with multifarious security issues.
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Affiliation(s)
- Xiwen Ye
- Jilin Province Research Center for Engineering and Technology of Spectral Analytical Instruments, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, China
| | - Jingkang Li
- Jilin Province Research Center for Engineering and Technology of Spectral Analytical Instruments, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, China
| | - Dejiang Gao
- Jilin Province Research Center for Engineering and Technology of Spectral Analytical Instruments, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, China
| | - Pinyi Ma
- Jilin Province Research Center for Engineering and Technology of Spectral Analytical Instruments, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, China
| | - Qiong Wu
- Key Laboratory of Pathobiology, Ministry of Education, Nanomedicine and Translational Research Center, China-Japan Union Hospital of Jilin University, Changchun 130030, China
| | - Daqian Song
- Jilin Province Research Center for Engineering and Technology of Spectral Analytical Instruments, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, China
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Mohsin AS, Jamiruddin MR, Peyal MMK, Sharmin S, Ahmed A, Puspita AH, Sharfuddin A, Malik A, Hasib A, Suchona SA, Chowdhury AM, Kabir ER. Design optimization and validation of UV-C illumination chamber for filtering facepiece respirators. Heliyon 2024; 10:e26348. [PMID: 38439842 PMCID: PMC10909644 DOI: 10.1016/j.heliyon.2024.e26348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 09/10/2023] [Accepted: 02/12/2024] [Indexed: 03/06/2024] Open
Abstract
In this study, we constructed an UV-C illumination chamber using commercially available germicidal lamps and other locally available low-cost components for general-purpose biological decontamination purposes. The illumination chamber provides uniform illumination of around 1 J/cm2 in under 5 min across the chamber. The control mechanism was developed to automate the on/off process and make it more secure minimizing health and other electrical safety. To validate the decontamination efficacy of the UV-C Illumination Chamber we performed the Geobacillus spore strip culture assay. Additionally, we performed the viral load measurement by identifying the COVID-19-specific N-gene and ORF1 gene on surgical masks. The gold standard RT-qPCR measurement was performed to detect and quantify the COVID-19-specific gene on the mask sample. The biochemical assay was conducted on the control and test group to identify the presence of different types of bacteria, and fungi before and after exposure under the illumination chamber. The findings of our study revealed satisfactory decontamination efficacy test results. Therefore, it could be an excellent device in healthcare settings as a disinfection tool for biological decontamination such as SAR-CoV-2 virus, personal protection equipment (PPE), (including n95, k95 respirators, and surgical masks), and other common pathogens.
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Affiliation(s)
- Abu S.M. Mohsin
- Department of Electrical and Electronics Engineering, Brac University, 66 Mohakhali, Dhaka, Bangladesh
| | - Mohd. Raeed Jamiruddin
- School of Pharmacy, Brac University, 66 Mohakhali, Dhaka, Bangladesh
- Gonoshasthaya-RNA Molecular Diagnostic and Research Center, Dhaka, Bangladesh
| | - Md Mahmudul Kabir Peyal
- Department of Electrical and Electronics Engineering, Brac University, 66 Mohakhali, Dhaka, Bangladesh
| | - Shahana Sharmin
- School of Pharmacy, Brac University, 66 Mohakhali, Dhaka, Bangladesh
| | - Ashfaq Ahmed
- School of Pharmacy, Brac University, 66 Mohakhali, Dhaka, Bangladesh
| | - Afrin Hossain Puspita
- Department of Electrical and Electronics Engineering, Brac University, 66 Mohakhali, Dhaka, Bangladesh
| | - A.A.M. Sharfuddin
- School of Pharmacy, Brac University, 66 Mohakhali, Dhaka, Bangladesh
| | - Afrida Malik
- Department of Electrical and Electronics Engineering, Brac University, 66 Mohakhali, Dhaka, Bangladesh
| | - Al Hasib
- School of Pharmacy, Brac University, 66 Mohakhali, Dhaka, Bangladesh
| | | | - Arshad M. Chowdhury
- Department of Electrical and Electronics Engineering, Brac University, 66 Mohakhali, Dhaka, Bangladesh
| | - Eva Rahman Kabir
- School of Pharmacy, Brac University, 66 Mohakhali, Dhaka, Bangladesh
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Oppezzo OJ, Abrevaya XC, Giacobone AFF. An alternative interpretation for tailing in survival curves for bacteria exposed to germicidal radiation. Photochem Photobiol 2024; 100:129-136. [PMID: 37026990 DOI: 10.1111/php.13808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Revised: 03/13/2023] [Accepted: 04/02/2023] [Indexed: 04/08/2023]
Abstract
It has been proposed that transient and reversible phenotypic changes could modify the response of bacteria to germicidal radiation, eventually leading to tailing in the survival curves. If this were the case, changes in susceptibility to radiation would reflect variations in gene expression and should only occur in cells in which gene expression is active. To obtain experimental evidence supporting the involvement of phenotypic changes in the origin of tailing, we studied changes in the susceptibility to radiation of cells able to survive high fluences, using split irradiations. Stationary phase cells of Enterobacter cloacae and Deinococcus radiodurans, in which gene expression is active, and spores of Bacillus subtilis, which are dormant cells without active gene expression, were used as microbial models. While cells of E. cloacae and D. radiodurans became susceptible after surviving exposures to high fluences, tolerant spores exhibited unchanged response to radiation. The results can be interpreted assuming that noise in gene expression modifies bacterial susceptibility to radiation, and tailing is the result of intrinsic phenomena of bacterial physiology rather than a technical artifact. For either theoretical or practical purposes, deviations from simple exponential decay kinetics should be considered in estimations of the effects of germicidal radiation at high fluences.
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Affiliation(s)
- Oscar J Oppezzo
- Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
| | - Ximena C Abrevaya
- Instituto de Astronomía y Física del Espacio (UBA-CONICET), Buenos Aires, Argentina
- Facultad de Ciencias Exactas y Naturales, UBA, Buenos Aires, Argentina
| | - Ana F F Giacobone
- Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
- Universidad Nacional de Tres de Febrero, Buenos Aires, Argentina
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Cetinkaya YN, Bulut O, Oktem HA, Yilmaz MD. Fluorescent silica nanoparticles as nano-chemosensors for the sequential detection of Pb 2+ ions and bacterial-spore biomarker dipicolinic acid (DPA) in aqueous solution. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 303:123222. [PMID: 37542871 DOI: 10.1016/j.saa.2023.123222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/07/2023] [Accepted: 07/30/2023] [Indexed: 08/07/2023]
Abstract
Herein, we report fluorescein-labelled silica nanoparticles (FSNP) which serve as fluorescent nano-chemosensors for sequential detection of Pb2+ (which is a toxic heavy metal) and dipicolinic acid (DPA) (which is a distinctive indicator biomarker of bacterial spores) with high sensitivity and selectivity. The fluorescence of FSNP is quenched because of the complex formation between Pb2+ ions and surface amide groups, however, the fluorescence is recovered in contact with DPA, resulting from the association of DPA with surface bound Pb2+ ions. FSNP-Pb2+ complexes show high sensitivity towards DPA with a low detection limit of 850 nM which is approximately seventy times lower than the infectious dosage of bacterial spores (60 μM). Lateral flow test platform was further developed to show the applicability and practicability of our system.
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Affiliation(s)
- Yagmur Nur Cetinkaya
- Department of Materials Science and Nanotechnology, Graduate School of Natural and Applied Sciences, Konya Food and Agriculture University, 42080 Konya, Turkey
| | - Onur Bulut
- Department of Bioengineering, Faculty of Engineering and Architecture, Konya Food and Agriculture University, 42080 Konya, Turkey
| | - Huseyin Avni Oktem
- Department of Biological Sciences, Middle East Technical University, 06800 Ankara, Turkey; Nanobiz Technology Inc., Gallium Block No: 27 / 218, METU Technopolis, Ankara, Turkey
| | - M Deniz Yilmaz
- Department of Basic Sciences, Faculty of Engineering, Necmettin Erbakan University, 42140 Konya, Turkey; BITAM-Science and Technology Research and Application Center, Necmettin Erbakan University, 42140 Konya, Turkey.
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Lagos-Palomino L, Rueda-Torres L, Sanchez-Holguin G, Soncco-Llulluy F, Rosales-Rimache J. Performance evaluation of the sterilization process with Bowie & Dick test and biological indicator in the quality control of a blood bank in Peru. Medicine (Baltimore) 2023; 102:e35293. [PMID: 37960832 PMCID: PMC10637551 DOI: 10.1097/md.0000000000035293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 08/29/2023] [Indexed: 11/15/2023] Open
Abstract
Managing contaminated waste in blood banks is a crucial process that must end with the safe disposal of blood products. In this sense, practical methods and indicators must be used to guarantee the operability of autoclave equipment and the sterility of treated waste to mitigate the risk of biological exposure and hospital biosafety. We designed a cross-sectional study to evaluate the performance the autoclaving process with Bowie & Dick test and biological indicator at the Hemotherapy and Blood Bank Unit of the Cayetano Heredia Hospital in Peru. Fifty autoclaving processes were carried out independently for the Bowie & Dick tests and biological indicators based on Geobacillus stearothermophilus spores. Autoclaving was programmed at 134°C for 3.5 minutes for the Bowie & Dick test, while, for the biological indicator, it was programmed at 121°C for 5 minutes. Both in the presence of contaminated waste. The autoclaving process evaluated by the Bowie & Dick test had a compliance rate of 80% (CI95: 66.3%-90.0%), while, by the biological indicator, 90% (CI95: 78.2%-96.7%). We did not find significant differences between the results of both tests (P = .689; Fisher exact test). The compliance rate in the autoclaving process within the blood bank of a Peruvian Hospital is acceptable; however, there are actions for continuous improvement, especially at the vacuum level in the autoclaving process.
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Affiliation(s)
| | - Lenin Rueda-Torres
- Centro Nacional de Salud Ocupacional y Protección del Ambiente para la Salud, Instituto Nacional de Salud, Lima, Perú
| | | | | | - Jaime Rosales-Rimache
- Vicerectorado de Investigación, Universidad Privada Norbert Wiener, Lima, Perú
- .Escuela Profesional de Tecnología Médica, Universidad Continental, Lima, Perú
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Lordelo R, Botelho JRS, Morais PV, de Sousa HC, Branco R, Dias AMA, Reis MS. Evaluation of the Microbiological Effectiveness of Three Accessible Mask Decontamination Methods and Their Impact on Filtration, Air Permeability and Physicochemical Properties. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19116567. [PMID: 35682153 PMCID: PMC9180249 DOI: 10.3390/ijerph19116567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 05/23/2022] [Accepted: 05/24/2022] [Indexed: 11/16/2022]
Abstract
The need to secure public health and mitigate the environmental impact associated with the massified use of respiratory protective devices (RPD) has been raising awareness for the safe reuse of decontaminated masks by individuals and organizations. Among the decontamination treatments proposed, in this work, three methods with the potential to be adopted by households and organizations of different sizes were analysed: contact with nebulized hydrogen peroxide (H2O2); immersion in commercial bleach (NaClO) (sodium hypochlorite, 0.1% p/v); and contact with steam in microwave steam-sanitizing bags (steam bag). Their decontamination effectiveness was assessed using reference microorganisms following international standards (issued by ISO and FDA). Furthermore, the impact on filtration efficiency, air permeability and several physicochemical and structural characteristics of the masks, were evaluated for untreated masks and after 1, 5 and 10 cycles of treatment. Three types of RPD were analysed: surgical, KN95, and cloth masks. Results demonstrated that the H2O2 protocol sterilized KN95 and surgical masks (reduction of >6 log10 CFUs) and disinfected cloth masks (reduction of >3 log10 CFUs). The NaClO protocol sterilized surgical masks, and disinfected KN95 and cloth masks. Steam bags sterilized KN95 and disinfected surgical and cloth masks. No relevant impact was observed on filtration efficiency.
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Affiliation(s)
- Roberta Lordelo
- Centre for Mechanical Engineering, Materials and Processes (CEMMPRE), Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal; (R.L.); (R.B.)
| | - José Rafael S. Botelho
- Chemical Process Engineering and Forest Products Research Centre (CIEPQPF), Department of Chemical Engineering, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal; (J.R.S.B.); (H.C.d.S.); (A.M.A.D.)
| | - Paula V. Morais
- Centre for Mechanical Engineering, Materials and Processes (CEMMPRE), Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal; (R.L.); (R.B.)
- Correspondence: (P.V.M.); (M.S.R.)
| | - Hermínio C. de Sousa
- Chemical Process Engineering and Forest Products Research Centre (CIEPQPF), Department of Chemical Engineering, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal; (J.R.S.B.); (H.C.d.S.); (A.M.A.D.)
| | - Rita Branco
- Centre for Mechanical Engineering, Materials and Processes (CEMMPRE), Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal; (R.L.); (R.B.)
| | - Ana M. A. Dias
- Chemical Process Engineering and Forest Products Research Centre (CIEPQPF), Department of Chemical Engineering, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal; (J.R.S.B.); (H.C.d.S.); (A.M.A.D.)
| | - Marco S. Reis
- Chemical Process Engineering and Forest Products Research Centre (CIEPQPF), Department of Chemical Engineering, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal; (J.R.S.B.); (H.C.d.S.); (A.M.A.D.)
- Correspondence: (P.V.M.); (M.S.R.)
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8
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Li K, Li X, Wang D, Li Z, Li C. Sensitive and selective turn-on fluorescent switch based on europium-functionalized fluorescent covalent for rapid monitoring of an anthrax biomarker. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106764] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Grandjean Lapierre S, Bedwani S, DeBlois F, Fortin A, Zamorano Cuervo N, Zerouali K, Caron E, Morency-Potvin P, Gagnon S, Nguissan N, Arlotto P, Hardy I, Boutin CA, Tremblay C, Coutlée F, de Guise J, Grandvaux N. Clinical Evaluation of In-House-Produced 3D-Printed Nasopharyngeal Swabs for COVID-19 Testing. Viruses 2021; 13:1752. [PMID: 34578334 PMCID: PMC8473445 DOI: 10.3390/v13091752] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 08/18/2021] [Accepted: 08/30/2021] [Indexed: 01/03/2023] Open
Abstract
3D-printed alternatives to standard flocked swabs were rapidly developed to provide a response to the unprecedented and sudden need for an exponentially growing amount of diagnostic tools to fight the COVID-19 pandemic. In light of the anticipated shortage, a hospital-based 3D-printing platform was implemented in our institution for the production of swabs for nasopharyngeal and oropharyngeal sampling based on the freely available, open-source design provided to the community by University of South Florida's Health Radiology and Northwell Health System teams as a replacement for locally used commercial swabs. Validation of our 3D-printed swabs was performed with a head-to-head diagnostic accuracy study of the 3D-printed "Northwell model" with the cobas PCR Media® swab sample kit. We observed an excellent concordance (total agreement 96.8%, Kappa 0.936) in results obtained with the 3D-printed and flocked swabs, indicating that the in-house 3D-printed swab could be used reliably in the context of a shortage of flocked swabs. To our knowledge, this is the first study to report on autonomous hospital-based production and clinical validation of 3D-printed swabs.
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Affiliation(s)
- Simon Grandjean Lapierre
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
- Department of Microbiology, Infectious Diseases and Immunology, Université de Montréal, Montréal, QC H3C 3J7, Canada;
| | - Stéphane Bedwani
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
| | - François DeBlois
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
| | - Audray Fortin
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
| | - Natalia Zamorano Cuervo
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
| | - Karim Zerouali
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
| | - Elise Caron
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
| | - Philippe Morency-Potvin
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
- Department of Microbiology, Infectious Diseases and Immunology, Université de Montréal, Montréal, QC H3C 3J7, Canada;
| | - Simon Gagnon
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
| | - Nakome Nguissan
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
| | - Pascale Arlotto
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
| | - Isabelle Hardy
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
- Department of Microbiology, Infectious Diseases and Immunology, Université de Montréal, Montréal, QC H3C 3J7, Canada;
| | - Catherine-Audrey Boutin
- Department of Microbiology, Infectious Diseases and Immunology, Université de Montréal, Montréal, QC H3C 3J7, Canada;
| | - Cécile Tremblay
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
- Department of Microbiology, Infectious Diseases and Immunology, Université de Montréal, Montréal, QC H3C 3J7, Canada;
| | - François Coutlée
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
- Department of Microbiology, Infectious Diseases and Immunology, Université de Montréal, Montréal, QC H3C 3J7, Canada;
| | - Jacques de Guise
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
- Department of System Engineering, École de Technologie Supérieure, Université du Québec, Montréal, QC H3C 1K3, Canada
| | - Nathalie Grandvaux
- Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), 900 rue Saint-Denis, Montréal, QC H2X 0A9, Canada; (S.G.L.); (S.B.); (F.D.); (A.F.); (N.Z.C.); (K.Z.); (E.C.); (P.M.-P.); (S.G.); (N.N.); (P.A.); (I.H.); (C.T.); (F.C.); (J.d.G.)
- Department of Biochemistry and Molecular Medicine, Faculty of Medicine, Université de Montréal, Montréal, QC H3C 3J7, Canada
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Foelen Y, van der Heijden DAC, del Pozo M, Lub J, Bastiaansen CWM, Schenning APHJ. An Optical Steam Sterilization Sensor Based On a Dual-Responsive Supramolecular Cross-Linked Photonic Polymer. ACS APPLIED MATERIALS & INTERFACES 2020; 12:16896-16902. [PMID: 32223125 PMCID: PMC7146756 DOI: 10.1021/acsami.0c00711] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 03/12/2020] [Indexed: 05/06/2023]
Abstract
An optical time-temperature steam sensor is presented based on the loss of structural color in a supramolecularly cross-linked cholesteric liquid crystal photonic coating. A gradual decrease in the selective reflection band is observed upon exposure to temperatures above 105 °C related to the cholesteric to isotropic transition temperature. The linear polymers with carboxylic acid side chains provide physical cross-linking through hydrogen bonding that allows a time-temperature-dependent order loss through the dynamic equilibrium between supramolecular dimer and free monomer states. Steam is accelerating the color loss, and autoclave experiments show that the photonic supramolecular polymer is applicable as a steam sterilization sensor for medical applications.
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Affiliation(s)
- Yari Foelen
- Stimuli-responsive
Functional Materials and Devices, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, The Netherlands
| | - Danielle A. C. van der Heijden
- Stimuli-responsive
Functional Materials and Devices, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, The Netherlands
| | - Marc del Pozo
- Stimuli-responsive
Functional Materials and Devices, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, The Netherlands
| | - Johan Lub
- Stimuli-responsive
Functional Materials and Devices, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, The Netherlands
| | - Cees W. M. Bastiaansen
- Stimuli-responsive
Functional Materials and Devices, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, The Netherlands
- School
of Engineering and Materials Science, Queen
Mary University of London, Mile End Road, London E1 4NS, U.K.
| | - Albert P. H. J. Schenning
- Stimuli-responsive
Functional Materials and Devices, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, The Netherlands
- SCNU-TUE
Joint Laboratory of Device Integrated Responsive Materials (DIRM), South China Normal University, Guangzhou Higher Education Mega Center, Guangzhou 510006, China
- Institute
for Complex Molecular Systems, Eindhoven
University of Technology, Den Dolech 2, Eindhoven 5600 MB, The Netherlands
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11
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Guo L, Liang M, Wang X, Kong R, Chen G, Xia L, Qu F. The role of l-histidine as molecular tongs: a strategy of grasping Tb 3+ using ZIF-8 to design sensors for monitoring an anthrax biomarker on-the-spot. Chem Sci 2020; 11:2407-2413. [PMID: 34084404 PMCID: PMC8157567 DOI: 10.1039/d0sc00030b] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Accepted: 01/15/2020] [Indexed: 01/05/2023] Open
Abstract
In this study, a novel lanthanide-doped nanoprobe for monitoring dipicolinic acid (DPA), a unique biomarker of Bacillus anthracis, was constructed by coordination of Tb3+ with l-histidine (His) functionalized ZIF-8 (His@ZIF-8). After being functionalized with His, the resultant His@ZIF-8 had abundant carboxyl and amino groups, which like tongs help His@ZIF-8 "grasp" Tb3+ firmly to form a stable lanthanide-doped nanoparticle (His@ZIF-8/Tb3+). Owing to the unsaturated coordination of Tb3+ with the amino acid group, the resultant His@ZIF-8/Tb3+ showed reserved response sites of Tb3+ to DPA because of its unique molecular structure. After the His@ZIF-8/Tb3+ coordination with DPA, the intrinsic fluorescence emission of the Tb3+ ions was triggered through energy transfer, leading to bright yellow green luminescence owing to the antenna role of DPA. Benefitting from the His functionalization and the characteristics of ZIF-8, especially the high porosity and large surface area, the developed His@ZIF-8/Tb3+ sensing platform exhibited attractive features as a fluorescent sensor for monitoring DPA such as fast response kinetics (10 s), high sensitivity and selectivity, and being portable, easy to operate, economical and secure. This sensor platform showed a satisfactory linear relationship (R 2 = 0.999) ranging from 0.08 to 10 μmol L-1 and an ultralow limit of detection (LOD) of 0.02 μmol L-1. This strategy for the design of functionalized MOFs to construct sensing probes and the resultant His@ZIF-8/Tb3+ would provide a potential strategy for the exploitation of other functionalized materials used in other research fields and promising fluorescence platforms for the detection of other targets.
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Affiliation(s)
- Lan Guo
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University Qufu 273165 China
| | - Maosheng Liang
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University Qufu 273165 China
| | - Xiuli Wang
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University Qufu 273165 China
| | - Rongmei Kong
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University Qufu 273165 China
| | - Guang Chen
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University Qufu 273165 China
| | - Lian Xia
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University Qufu 273165 China
| | - Fengli Qu
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University Qufu 273165 China
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12
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Chen H, Shi R, Ow H. Predicting Stability Constants for Terbium(III) Complexes with Dipicolinic Acid and 4-Substituted Dipicolinic Acid Analogues using Density Functional Theory. ACS OMEGA 2019; 4:20665-20671. [PMID: 31858052 PMCID: PMC6906780 DOI: 10.1021/acsomega.9b02851] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 11/14/2019] [Indexed: 06/10/2023]
Abstract
The relative stability constants of Tb(III) complexes exhibiting binding to a series of 4-substituted analogues of dipicolinic acid (2,6-pyridinedicarboxylic acid) (DPA) were calculated using density functional theory (DFT) with the standard thermodynamic cycle. DFT calculations showed that the strengths of the stability constants were modified by the substituents in the following (decreasing) order: -NH2 > -OH ∼ -CH2OH > -imidazole ∼ -Cl ∼ -Br ∼ -H > -F > -I, with the differences among them falling within one to two log units except for -NH2. Through population and structural analysis, we observed that the -NH2, -OH, -CH2OH, and halide substituents can donate electrons via resonance effect to the pyridine ring of DPA while inductively withdrawing electrons with different strengths, thus resulting in the different binding strengths of the 4-substituted DPAs to the Tb(III) ions. We believe that these observations possess utility not only in the ongoing development of luminescent probes for bioanalytical studies but also for more recent cross-industrial efforts to enhance reservoir surveillance capabilities using chemical tracers within the oil and gas sector.
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13
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Cetinkaya Y, Yurt MNZ, Avni Oktem H, Yilmaz MD. A Monostyryl Boradiazaindacene (BODIPY)-based lanthanide-free colorimetric and fluorogenic probe for sequential sensing of copper (II) ions and dipicolinic acid as a biomarker of bacterial endospores. JOURNAL OF HAZARDOUS MATERIALS 2019; 377:299-304. [PMID: 31173979 DOI: 10.1016/j.jhazmat.2019.05.108] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 05/18/2019] [Accepted: 05/30/2019] [Indexed: 06/09/2023]
Abstract
A new catechol-substituted monostyryl boradiazaindacene (BODIPY)-based lanthanide-free colorimetric and fluorogenic probe was developed for the sequential detection of Cu2+ ions and dipicolinic acid (DPA), a distinctive biomarker of bacterial endospores, with high sensitivity and selectivity. In the presence of Cu2+ ions, the blue solution of the probe changes to cyan and the fluorescence is quenched, however, the cyan color changes to blue immediately and the fluorescence is restored on contact with DPA, resulting from competitive binding of DPA that interact with Cu2+ ions. A practical application by using Geobacillus stearothermophilus spores was further studied and as low as 1.0 x 105 spores were detected.
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Affiliation(s)
- Yagmur Cetinkaya
- Department of Bioengineering, Faculty of Engineering and Architecture, Konya Food and Agriculture University, 42080 Konya, Turkey
| | - Mediha Nur Zafer Yurt
- Research and Development Center for Diagnostic Kits (KIT-ARGEM), Konya Food and Agriculture University, 42080 Konya, Turkey; Institute of Science, Biotechnology Graduate Program, Konya Food and Agriculture University, Konya, 42080, Turkey
| | - Huseyin Avni Oktem
- Department of Biological Sciences, Middle East Technical University, 06800 Ankara, Turkey; Nanobiz R&D Ltd., Gallium Bld. No.18, METU Science Park, Ankara, Turkey
| | - M Deniz Yilmaz
- Department of Bioengineering, Faculty of Engineering and Architecture, Konya Food and Agriculture University, 42080 Konya, Turkey; Research and Development Center for Diagnostic Kits (KIT-ARGEM), Konya Food and Agriculture University, 42080 Konya, Turkey; Institute of Science, Biotechnology Graduate Program, Konya Food and Agriculture University, Konya, 42080, Turkey.
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14
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Robinson CV, Bishop AH. A disclosure gel for visual detection of live Bacillus anthracis spores. J Appl Microbiol 2019; 126:1700-1707. [PMID: 30776160 PMCID: PMC6850754 DOI: 10.1111/jam.14226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 02/14/2019] [Accepted: 02/14/2019] [Indexed: 11/29/2022]
Abstract
Aims To develop a gel formulation to trigger a visual signal for rapid disclosure of the location and extent of surface contamination with viable Bacillus anthracis spores. Methods and Results Methylumbelliferyl‐α‐d‐glucopyranoside was combined with hyaluronic acid to produce a gel that could be applied to a surface as a coating. It remained hydrated for a sufficient time for α‐glucosidase activity present in intact B. anthracis spores to cleave the substrate and release the fluorescent product, methylumbelliferone. The presence of B. anthracis spores could be disclosed at 5 × 104CFU per reaction test well (0·32 cm2) both visually and using fluorescence detection equipment. Conclusions The disclosure gel provides a rapid, visual response to the presence of B. anthracis spores on a surface. Significance and Impact of the Study The disclosure gel demonstrates the first steps towards the development of a formulation that can provide nonspecialist users with a visual alert to the presence of B. anthracis spores on a surface. It is envisioned that such a formulation would be beneficial in scenarios where exposure to spore release is a risk, and could be used in the initial assessment of equipment to aid prioritization and localized execution of a decontamination strategy.
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Affiliation(s)
- C V Robinson
- Defence Science and Technology Laboratory, Porton Down, Salisbury, Wiltshire, UK
| | - A H Bishop
- School of Biological and Marine Sciences, University of Plymouth, Plymouth, Devon, UK
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15
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Yilmaz MD, Oktem HA. Eriochrome Black T–Eu3+ Complex as a Ratiometric Colorimetric and Fluorescent Probe for the Detection of Dipicolinic Acid, a Biomarker of Bacterial Spores. Anal Chem 2018; 90:4221-4225. [DOI: 10.1021/acs.analchem.8b00576] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- M. Deniz Yilmaz
- Department of Bioengineering, Faculty of Engineering and Architecture, Konya Food and Agriculture University, 42080 Konya, Turkey
- Research and Development Center for Diagnostic Kits (KIT-ARGEM), Konya Food and Agriculture University, 42080 Konya, Turkey
| | - Huseyin Avni Oktem
- Department of Biological Sciences, Middle East Technical University, 06800 Ankara, Turkey
- Nanobiz R&D Ltd., Gallium Bld. No.18, METU Science Park, Ankara, Turkey
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16
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Camargo TCD, Graziano KU, Almeida AGCDS, Suzuki K, Silva CBD, Pinto FMG. Microbiological evaluation of the steam sterilization of assembled laparoscopic instruments. Rev Lat Am Enfermagem 2016; 24:e2830. [PMID: 27878222 PMCID: PMC5173303 DOI: 10.1590/1518-8345.1431.2830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2015] [Accepted: 08/14/2016] [Indexed: 11/22/2022] Open
Abstract
Objective assess the safety of steam sterilization of assembled laparoscopic instruments with challenge contamination. Method a laboratory experimental study, using as test samples trocars and laparoscopic graspers. Geobacillus stearothermophillus ATCC-7953 was used, with a microbial population of 106UFC/Filter paper substrate, removed from the biological indicator. Three of them were introduced into each instrument at the time of assembly, and sterilized at pressurized saturated steam, 134oC for 5 minutes. After sterilization, the instrument was disassembled and each filter paper substrate was inoculated in soybean casein culture and incubated at 56oC for 21 days. In case of absence of growth, they were subjected to heat shock of 80oC, for 20 minutes and re-incubated for 72 hours. Sample size: 185 graspers and 185 trocars, with 95% power. We paired the experiments with comparative negative control groups (5 graspers and 5 trocars with challenge contamination, sterilized disassembled) and positive control (30 filter paper supports, unsterilized), subject to the same incubation procedures. Results there was no microbial growth in experimental and negative control. The results of the positive control were satisfactory. Conclusion this study provided strong scientific evidence to support the safety of steam sterilizing of the assembled laparoscopic instrument.
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Affiliation(s)
- Tamara Carolina de Camargo
- PhD, Assistant Professor, Faculdade de Ciências Médicas e da Saúde, Pontifícia Universidade Católica de São Paulo, Sorocaba, SP, Brazil
| | | | | | - Karina Suzuki
- PhD, Adjunct Professor, Faculdade de Enfermagem, Universidade Federal de Goiás, Goiânia, GO, Brazil
| | | | - Flávia Morais Gomes Pinto
- PhD, Professor Instructor, Faculdade de Ciências Médicas, Santa Casa de Misericórdia, São Paulo, SP, Brazil
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17
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Huesca-Espitia LC, Suvira M, Rosenbeck K, Korza G, Setlow B, Li W, Wang S, Li YQ, Setlow P. Effects of steam autoclave treatment on Geobacillus stearothermophilus spores. J Appl Microbiol 2016; 121:1300-1311. [PMID: 27538778 DOI: 10.1111/jam.13257] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 08/10/2016] [Accepted: 08/12/2016] [Indexed: 11/29/2022]
Abstract
AIMS To determine the mechanism of autoclave killing of Geobacillus stearothermophilus spores used in biological indicators (BIs) for steam autoclave sterilization, and rates of loss of spore viability and a spore enzyme used in BIs. METHODS AND RESULTS Spore viability, dipicolinic acid (DPA) release, nucleic acid staining, α-glucosidase activity, protein structure and mutagenesis were measured during autoclaving of G. stearothermophilus spores. Loss of DPA and increases in spore core nucleic acid staining were slower than loss of spore viability. Spore core α-glucosidase was also lost more slowly than spore viability, although soluble α-glucosidase in spore preparations was lost more rapidly. However, spores exposed to an effective autoclave sterilization lost all viability and α-glucosidase activity. Apparently killed autoclaved spores were not recovered by artificial germination in supportive media, much spore protein was denatured during autoclaving, and partially killed autoclave-treated spore preparations did not acquire mutations. CONCLUSIONS These results indicate that autoclave-killed spores cannot be revived, spore killing by autoclaving is likely by protein damage, and spore core α-glucosidase activity is lost more slowly than spore viability. SIGNIFICANCE AND IMPACT OF THE STUDY This work provides insight into the mechanism of autoclave killing of spores of an organism used in BIs, and that a spore enzyme in a BI is more stable to autoclaving than spore viability.
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Affiliation(s)
- L C Huesca-Espitia
- Departamento de Ingenieria Quimica, Alimentos y Ambiental. Universidad de las Americas, Puebla, Mexico.,Department of Molecular Biology and Biophysics, UConn Health, Farmington, CT, USA
| | - M Suvira
- Department of Molecular Biology and Biophysics, UConn Health, Farmington, CT, USA
| | - K Rosenbeck
- Department of Molecular Biology and Biophysics, UConn Health, Farmington, CT, USA
| | - G Korza
- Department of Molecular Biology and Biophysics, UConn Health, Farmington, CT, USA
| | - B Setlow
- Department of Molecular Biology and Biophysics, UConn Health, Farmington, CT, USA
| | - W Li
- Department of Physics, East Carolina University, Greenville, NC, USA
| | - S Wang
- Department of Physics, East Carolina University, Greenville, NC, USA
| | - Y-Q Li
- Department of Physics, East Carolina University, Greenville, NC, USA
| | - P Setlow
- Department of Molecular Biology and Biophysics, UConn Health, Farmington, CT, USA.
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18
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Setlow B, Korza G, Setlow P. Analysis of α
-glucosidase enzyme activity used in a rapid test for steam sterilization assurance. J Appl Microbiol 2016; 120:1326-35. [DOI: 10.1111/jam.13074] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 12/29/2015] [Accepted: 01/14/2016] [Indexed: 11/26/2022]
Affiliation(s)
- B. Setlow
- Department of Molecular Biology and Biophysics; UConn Health; Farmington CT USA
| | - G. Korza
- Department of Molecular Biology and Biophysics; UConn Health; Farmington CT USA
| | - P. Setlow
- Department of Molecular Biology and Biophysics; UConn Health; Farmington CT USA
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19
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Georget E, Miller B, Aganovic K, Callanan M, Heinz V, Mathys A. Bacterial spore inactivation by ultra-high pressure homogenization. INNOV FOOD SCI EMERG 2014. [DOI: 10.1016/j.ifset.2014.08.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Georget E, Miller B, Callanan M, Heinz V, Mathys A. (Ultra) high pressure homogenization for continuous high pressure sterilization of pumpable foods - a review. Front Nutr 2014; 1:15. [PMID: 25988118 PMCID: PMC4428391 DOI: 10.3389/fnut.2014.00015] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 08/01/2014] [Indexed: 11/29/2022] Open
Abstract
Bacterial spores have a strong resistance to both chemical and physical hurdles and create a risk for the food industry, which has been tackled by applying high thermal intensity treatments to sterilize food. These strong thermal treatments lead to a reduction of the organoleptic and nutritional properties of food and alternatives are actively searched for. Innovative hurdles offer an alternative to inactivate bacterial spores. In particular, recent technological developments have enabled a new generation of high pressure homogenizer working at pressures up to 400 MPa and thus, opening new opportunities for high pressure sterilization of foods. In this short review, we summarize the work conducted on (ultra) high pressure homogenization (U)HPH to inactivate endospores in model and food systems. Specific attention is given to process parameters (pressure, inlet, and valve temperatures). This review gathers the current state of the art and underlines the potential of UHPH sterilization of pumpable foods while highlighting the needs for future work.
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Affiliation(s)
- Erika Georget
- German Institute of Food Technologies (DIL), Quakenbrueck, Germany
- Institute of Food Chemistry, Leibniz University of Hanover, Hanover, Germany
| | - Brittany Miller
- German Institute of Food Technologies (DIL), Quakenbrueck, Germany
| | | | - Volker Heinz
- German Institute of Food Technologies (DIL), Quakenbrueck, Germany
| | - Alexander Mathys
- German Institute of Food Technologies (DIL), Quakenbrueck, Germany
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21
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Schneider PM. Evaluation of a new rapid readout biological indicator for use in 132°C and 135°C vacuum-assisted steam sterilization cycles. Am J Infect Control 2014; 42:e17-21. [PMID: 24485381 DOI: 10.1016/j.ajic.2013.09.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Revised: 09/08/2013] [Accepted: 09/09/2013] [Indexed: 10/25/2022]
Abstract
BACKGROUND Sterilization is a process that cannot be inspected or tested in a practical manner to assure that all microorganisms have been inactivated. The process must therefore be validated for all of the specific items processed or monitored on a per cycle basis. METHODS A new, faster rapid readout biological indicator (RRBI) has been developed for use in 132°C and 135°C vacuum-assisted steam sterilization cycles. The aim of this study was to evaluate the performance of this new 1-hour readout RRBI at 132°C in side-by-side testing with an existing 3-hour readout RRBI and also evaluate the performance of the new RRBI in 135°C cycles. Readout responses of 1 hour (fluorescent) and 48 hours and 7 days (growth) of the new RRBI were compared with 3-hour, 48-hour, and 7-day readouts of the 3-hour RRBI following exposures in 132°C cycles using a highly controlled test vessel, ie, a steam resistometer. Additional testing of the 1-hour RRBIs was also performed in 135°C cycles. RESULTS The number and percentage of fluorescent-positive 1-hour RRBIs were virtually identical to those of the 3-hour RRBIs after 1 and 3 hours of incubation, respectively. Testing of the 1-hour RRBI in 135°C cycles paralleled the results of the testing at 132°C but with the expected shorter exposure times. CONCLUSION The results of this study suggest that the 1-hour RRBI is equivalent to the 3-hour RRBI and would be suitable for use in monitoring dynamic air removal steam sterilization cycles at both 132°C and 135°C per recommended practice guidelines.
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Cihan AC, Benli M, Cokmus C. Purification and characterization of intracellular and extracellular α-glucosidases from Geobacillus toebii strain E134. Cell Biochem Funct 2011; 30:69-81. [DOI: 10.1002/cbf.1820] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Revised: 09/15/2011] [Accepted: 09/27/2011] [Indexed: 11/07/2022]
Affiliation(s)
- Arzu Coleri Cihan
- Ankara University; Faculty of Science, Biology Department; Tandogan; Ankara,; Turkey
| | - Mehlika Benli
- Ankara University; Faculty of Science, Biology Department; Tandogan; Ankara,; Turkey
| | - Cumhur Cokmus
- Ankara University; Faculty of Science, Biology Department; Tandogan; Ankara,; Turkey
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23
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Deguchi E, Koumoto K. Cellular zwitterionic metabolite analogs simultaneously enhance reaction rate, thermostability, salt tolerance, and substrate specificity of α-glucosidase. Bioorg Med Chem 2011; 19:3128-34. [DOI: 10.1016/j.bmc.2011.04.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Revised: 03/31/2011] [Accepted: 04/01/2011] [Indexed: 11/26/2022]
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Papalazaridou A, Kanata E, Sivropoulou A. Germinant generation from δ-endotoxin of Bacillus thuringiensis strain 1.1. Curr Microbiol 2011; 62:1431-7. [PMID: 21286721 DOI: 10.1007/s00284-011-9878-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Accepted: 01/10/2011] [Indexed: 10/18/2022]
Abstract
The novel finding of this study is that the δ-endotoxin present in the spore coat of Bacillus thuringiensis strain 1.1 (Bt1.1), plays a central role in spore germination by generation of germinant via its β-glucosidase activity and is based on the following: (i) the crystals of Bt1.1 consist of the 140 kDa δ-endotoxin which exhibits β-glucosidase enzymatic activity. Besides crystals, δ-endotoxin is also located in the spore coat and at this site displays β-glucosidase activity, resulting in glucose production; (ii) glucose is an efficient germinant of both Bt1.1 and acrystalliferous Bt4.1 strain; (iii) substrates of β-glucosidase can activate the germination of Bt1.1 spores, but not those of the acrystalliferous Bt4.1 sister strain that do not contain the 140 kDa δ-endotoxin; (iv) Reduction or enhancement of enzymatic activity of δ-endotoxin, results in retardation or acceleration of germination and outgrowth, respectively. Bt1.1 cells secrete a 60 kDa polypeptide which displays β-glucosidase activity as indicated by zymogram analysis and which is immunologically related to the 140 kDa δ-endotoxin.
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Affiliation(s)
- Anastasia Papalazaridou
- Department of Genetics, Development and Molecular Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece
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25
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Cable ML, Levine DJ, Kirby JP, Gray HB, Ponce A. Luminescent lanthanide sensors. ADVANCES IN INORGANIC CHEMISTRY 2011. [DOI: 10.1016/b978-0-12-385904-4.00010-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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26
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Cable ML, Kirby JP, Levine DJ, Manary MJ, Gray HB, Ponce A. Detection of bacterial spores with lanthanide-macrocycle binary complexes. J Am Chem Soc 2009; 131:9562-70. [PMID: 19537757 DOI: 10.1021/ja902291v] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The detection of bacterial spores via dipicolinate-triggered lanthanide luminescence has been improved in terms of detection limit, stability, and susceptibility to interferents by use of lanthanide-macrocycle binary complexes. Specifically, we compared the effectiveness of Sm, Eu, Tb, and Dy complexes with the macrocycle 1,4,7,10-tetraazacyclododecane-1,7-diacetate (DO2A) to the corresponding lanthanide aquo ions. The Ln(DO2A)(+) binary complexes bind dipicolinic acid (DPA), a major constituent of bacterial spores, with greater affinity and demonstrate significant improvement in bacterial spore detection. Of the four luminescent lanthanides studied, the terbium complex exhibits the greatest dipicolinate binding affinity (100-fold greater than Tb(3+) alone, and 10-fold greater than other Ln(DO2A)(+) complexes) and highest quantum yield. Moreover, the inclusion of DO2A extends the pH range over which Tb-DPA coordination is stable, reduces the interference of calcium ions nearly 5-fold, and mitigates phosphate interference 1000-fold compared to free terbium alone. In addition, detection of Bacillus atrophaeus bacterial spores was improved by the use of Tb(DO2A)(+), yielding a 3-fold increase in the signal-to-noise ratio over Tb(3+). Out of the eight cases investigated, the Tb(DO2A)(+) binary complex is best for the detection of bacterial spores.
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Affiliation(s)
- Morgan L Cable
- Planetary Science Section, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California 91109, USA
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Cihan AC, Ozcan B, Cokmus C. Characterization of thermostable α-glucosidases from newly isolated Geobacillus sp. A333 and thermophilic bacterium A343. World J Microbiol Biotechnol 2009. [DOI: 10.1007/s11274-009-0127-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Coleri A, Cokmus C, Ozcan B, Akkoc N, Akcelik M. Isolations of α-glucosidase-producing thermophilic bacilli from hot springs of Turkey. Microbiology (Reading) 2009. [DOI: 10.1134/s0026261709010081] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Kirby JP, Cable ML, Levine DJ, Gray HB, Ponce A. Spectroscopic analysis of ligand binding to lanthanide-macrocycle platforms. Anal Chem 2008; 80:5750-4. [PMID: 18578548 DOI: 10.1021/ac800154d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A high-affinity, binary Eu(3+) receptor site consisting of 1,4,7,10-tetraazacyclododecane-1,7-diacetate (DO2A) was constructed with the goal of improving the detection of dipicolinic acid (DPA), a major component of bacterial spores. Ternary Eu(DO2A)(DPA)(-) complex solutions (1.0 microM crystallographically characterized TBA x Eu(DO2A)(DPA)) were titrated with EuCl3 (1.0 nM-1.0 mM); increased Eu(3+) concentration resulted in a shift in equilibrium population from Eu(DO2A)(DPA)(-) to Eu(DO2A)(+) and Eu(DPA)(+), which was monitored via the ligand field sensitive (5)D0 --> (7)F3 transition (lambda(em) = 670-700 nm) using luminescence spectroscopy. A best fit of luminescence intensity titration data to a two-state thermodynamic model yielded the competition equilibrium constant (Kc), which in conjunction with independent measurement of the Eu(DPA)(+) formation constant (Ka) allowed calculation of the ternary complex formation constant (Ka'). With this binding affinity by competition (BAC) assay, we determined that Ka' = 10(8.21) M(-1), which is approximately 1 order of magnitude greater than the formation of Eu(DPA)(+). In general, the BAC assay can be employed to determine ligand binding constants of systems where the lanthanide platform (usually a binary complex) is stable and the ligand bound versus unbound states can be spectroscopically distinguished.
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Affiliation(s)
- James P Kirby
- Planetary Science Section, Jet Propulsion Laboratory, Pasadena, California 91109, USA.
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Ishii M, Kunimura JS, Penna TCV, Cholewa O. Study on the thermal stability of green fluorescent protein (GFP) in glucose parenteral formulations. Int J Pharm 2007; 337:109-17. [PMID: 17275229 DOI: 10.1016/j.ijpharm.2006.12.041] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2006] [Revised: 12/21/2006] [Accepted: 12/22/2006] [Indexed: 10/23/2022]
Abstract
Large volume parenteral solutions (LVPS) that are widely used in the healthcare system must be processed by moist-heat treatment to an assured sterility level in which the efficacy is measured by a bioindicator (BI) that provides fast, accurate and reliable results. This study evaluated the thermal stability of green fluorescent protein (GFP) into glucose-based LVPS (1.5-50%) solutions to determine its utility as a BI for thermal processes. GFP, expressed by Escherichia coli, isolated/purified by TPP/HIC, was diluted in buffered (each 10mM: Tris-EDTA, pH 8; phosphate, pH 6 and 7; acetate, pH 5) and in water for injection (WFI; pH 6.70+/-0.40) glucose solutions (1.5-50%) and exposed to constant temperatures from 80 degrees C to 95 degrees C. The thermal stability was expressed in decimal reduction time (D-value, time required to reduce 90% of the GFP fluorescence intensity). At 95 degrees C, the D-values for GFP in 1.5-50% glucose were: (i) 1.63+/-0.23 min (pH 5); (ii) 2.64+/-0.26 min (WFI); (iii) 2.50+/-0.18 min (pH 6); (iv) 3.24+/-0.28 min (pH 7); (v) 2.89+/-0.44 min (pH 8). By the convenient measure of fluorescence intensity and its thermal stability, GFP has the potential as a BI to assay the efficacy of moist-heat processing of LVPS at temperatures < or =100 degrees C.
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Affiliation(s)
- Marina Ishii
- Department of Pharmaceutical Technology, School of Pharmaceutical Science, University of São Paulo, Av. Prof. Lineu Prestes, 580 Bloco 16, Ed. Semi Industrial, Butantã, 05508-900 São Paulo, SP, Brazil.
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Cable ML, Kirby JP, Sorasaenee K, Gray HB, Ponce A. Bacterial spore detection by [Tb3+(macrocycle)(dipicolinate)] luminescence. J Am Chem Soc 2007; 129:1474-5. [PMID: 17243674 DOI: 10.1021/ja061831t] [Citation(s) in RCA: 138] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Morgan L Cable
- Beckman Institute, California Institute of Technology, Pasadena, California 91125, USA
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Schneider PM, Reich RR, Kirckof SS, Foltz WG. Performance of various steam sterilization indicators under optimum and sub-optimum exposure conditions. Am J Infect Control 2005; 33:S55-67. [PMID: 15940117 DOI: 10.1016/j.ajic.2005.05.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Setlow B, Cabrera-Martinez RM, Setlow P. Mechanism of the hydrolysis of 4-methylumbelliferyl-beta-D-glucoside by germinating and outgrowing spores of Bacillus species. J Appl Microbiol 2004; 96:1245-55. [PMID: 15139916 DOI: 10.1111/j.1365-2672.2004.02263.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS To determine the mechanism of the hydrolysis of 4-methylumbelliferyl-beta-D-glucopyranoside (beta-MUG) by germinating and outgrowing spores of Bacillus species. METHODS AND RESULTS Spores of B. atrophaeus (formerly B. subtilis var. niger, Fritze and Pukall 2001) are used as biological indicators of the efficacy of ethylene oxide sterilization by measurement of beta-MUG hydrolysis during spore germination and outgrowth. It was previously shown that beta-MUG is hydrolysed to 4-methylumbelliferone (MU) during the germination and outgrowth of B. atrophaeus spores (Chandrapati and Woodson 2003), and this was also the case with spores of B. subtilis 168. Germination of spores of either B. atrophaeus or B. subtilis with chloramphenicol reduced beta-MUG hydrolysis by almost 99%, indicating that proteins needed for rapid beta-MUG hydrolysis are synthesized during spore outgrowth. However, the residual beta-MUG hydrolysis during spore germination with chloramphenicol indicated that dormant spores contain low levels of proteins needed for beta-MUG uptake and hydrolysis. With B. subtilis 168 spores that lacked several general proteins of the phosphotransferase system (PTS) for sugar uptake, beta-MUG hydrolysis during spore germination and outgrowth was decreased >99.9%. This indicated that beta-MUG is taken up by the PTS, resulting in the intracellular accumulation of the phosphorylated form of beta-MUG, beta-MUG-6-phosphate (beta-MUG-P). This was further demonstrated by the lack of detectable glucosidase activity on beta-MUG in dormant, germinated and outgrowing spore extracts, while phosphoglucosidase active on beta-MUG-P was readily detected. Dormant B. subtilis 168 spores had low levels of at least four phosphoglucosidases active on beta-MUG-P: BglA, BglH, BglC (originally called YckE) and BglD (originally called YdhP). These enzymes were also detected in spores germinating and outgrowing with beta-MUG, but levels of BglH were the highest, as this enzyme's synthesis was induced ca 100-fold during spore outgrowth in the presence of beta-MUG. Deletion of the genes coding for BglA, BglH, BglC and BglD reduced beta-MUG hydrolysis by germinating and outgrowing spores of B. subtilis 168 at least 99.7%. Assay of glucosidases active on beta-MUG or beta-MUG-P in extracts of dormant and outgrowing spores of B. atrophaeus revealed no enzyme active on beta-MUG and one enzyme that comprised > or =90% of the phosphoglucosidase active on beta-MUG-P. Partial purification and amino-terminal sequence analysis of this phosphoglucosidase identified this enzyme as BglH. CONCLUSIONS Generation of MU from beta-MUG by germinating and outgrowing spores of B. atrophaeus and B. subtilis is mediated by the PTS-driven uptake and phosphorylation of beta-MUG, followed by phosphoglucosidase action on the intracellular beta-MUG-P. The major phosphoglucosidase catalyzing MU generation from beta-MUG-P in spores of both species is probably BglH. SIGNIFICANCE AND IMPACT OF THE STUDY This work provides new insight into the mechanism of uptake and hydrolysis of beta-MUG by germinating and outgrowing spores of Bacillus species, in particular B. atrophaeus. The research reported here provides a biological basis for a Rapid Readout Biological Indicator that is used to monitor the efficacy of ethylene oxide sterilization.
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Affiliation(s)
- B Setlow
- Department of Molecular, Microbial and Structural Biology, University of Connecticut Health Center, Farmington, CT 06032, USA
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Chandrapati S, Woodson LP. Inducible beta-glucosidase synthesis during germination and outgrowth of Bacillus subtilis ATCC 9372 spores. Lett Appl Microbiol 2003; 36:15-9. [PMID: 12485335 DOI: 10.1046/j.1472-765x.2003.01250.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
AIMS To investigate the role of germination processes in the expression of the beta-glucosidase enzyme in Bacillus subtilis ATCC 9372 spores. METHODS AND RESULTS Enzyme activity was monitored in germinating and non-germinating spores of B. subtilis ATCC 9372. The expression of beta-glucosidase by spores of B. subtilis was further investigated in the presence of a germination inhibitor, d-alanine, and a transcription inhibitor, novobiocin. Detection of enzyme activity required the presence of the germinant, l-alanine, as well as the inducer, 4-methylumbelliferryl-beta-d-glucoside. Furthermore, beta-glucosidase synthesis was abolished in the presence of d-alanine or novobiocin. CONCLUSIONS The data obtained in this study indicated that beta-glucosidase was not pre-existing, or merely attached to the spore, but was synthesized de novo during spore germination. SIGNIFICANCE AND IMPACT OF THE STUDY The requirement of functional germination processes for the detection of beta-glucosidase activity makes this enzyme a good candidate for detection of spore viability.
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Affiliation(s)
- S Chandrapati
- Infection Prevention Instruments and Equipment Management, Medical Division, 3M Health Care, St Paul, MN, USA.
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Alfa MJ, Olson N, DeGagne P, Jackson M. Evaluation of rapid readout biological indicators for 132 degrees C gravity and 132 degrees C vacuum-assisted steam sterilization cycles using a new automated fluorescent reader. Infect Control Hosp Epidemiol 2002; 23:388-92. [PMID: 12138978 DOI: 10.1086/502071] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
OBJECTIVE The primary objective of this study was to evaluate fluorescent readout results of Attest 1291 Biological Indicators (BIs) (3M Health Care, St. Paul, MN) and Attest 1296 BI test packs (containing Attest 1292 BIs) using full and fractional cycles compared with the growth data when prolonged incubation (7 days) was included. Gravity displacement and vacuum-assisted steam sterilization cycles were evaluated. A secondary objective of this study was to evaluate the new automated rapid fluorescent reader (Attest 290 Auto Reader). DESIGN The rapid readout BIs for gravity displacement and vacuum-assisted steam autoclave cycles at 132 degrees C were processed using full (4 minutes) and four fractional cycles that provided 30% to 80% positive results for growth after 24 hours of incubation (48 hours of incubation for Attest 1292 BIs from the Attest 1296 test packs). Sixty of each type of BI were tested for each cycle (300 of each BI type in total). RESULTS For all full steam sterilization cycles, results of the rapid fluorescent readout and the 24-hour, 48-hour, and 7-day growth tests were negative for all Attest 1291 and 1292 BIs tested. For all fractional cycles, the 24- and 48-hour growth results for the Attest 1291 and 1292 BIs, respectively, were the same as the 7-day growth results. The fractional cycle data indicated that fluorescent rapid readout was a more sensitive indicator than growth. There were rare (0.9%) false-negative results for BIs under fractional cycle conditions and these all correlated with short fractional cycle exposure times. CONCLUSIONS The fluorescent rapid readout results of the 1291 BIs and 1296 BI test packs reliably predict both 24- and 48-hour and 7-day growth. These data support the value of rapid readout BIs for sterilizer monitoring for both the vacuum-assisted and the gravity displacement steam sterilization cycles. The new automated reader requires less manipulation of the BI and makes monitoring user friendly and less prone to user errors.
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