Effectiveness of UV-C light assisted by mild heat on Saccharomyces cerevisiae KE 162 inactivation in carrot-orange juice blend studied by flow cytometry and transmission electron microscopy
The aim of this study was to analyze the effectiveness of UV-C light (0–10.6 kJ/m2) assisted by mild heat treatment (50 °C) on the inactivation of Saccharomyces cerevisiae KE 162 in peptone water and fresh carrot-orange juice blend (pH: 3.8; 9.8°Brix; 707 NTU; absorption coefficient: 0.17 cm−1). Yea...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07400020_v73_n_p1_GarciaCarrillo http://hdl.handle.net/20.500.12110/paper_07400020_v73_n_p1_GarciaCarrillo |
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paper:paper_07400020_v73_n_p1_GarciaCarrillo2025-07-30T18:20:58Z Effectiveness of UV-C light assisted by mild heat on Saccharomyces cerevisiae KE 162 inactivation in carrot-orange juice blend studied by flow cytometry and transmission electron microscopy Flow cytometry Mild heat Transmission electron microscopy UV-C light carrot chemistry evaluation study flow cytometry food preservation fruit and vegetable juice growth, development and aging heat microbial viability microbiology procedures radiation response Saccharomyces cerevisiae sweet orange transmission electron microscopy ultrastructure ultraviolet radiation Citrus sinensis Daucus carota Flow Cytometry Food Preservation Fruit and Vegetable Juices Hot Temperature Microbial Viability Microscopy, Electron, Transmission Saccharomyces cerevisiae Ultraviolet Rays The aim of this study was to analyze the effectiveness of UV-C light (0–10.6 kJ/m2) assisted by mild heat treatment (50 °C) on the inactivation of Saccharomyces cerevisiae KE 162 in peptone water and fresh carrot-orange juice blend (pH: 3.8; 9.8°Brix; 707 NTU; absorption coefficient: 0.17 cm−1). Yeast induced damage by single UV-C and mild heat (H) and the combined treatment UV-C/H, was investigated by flow cytometry (FC) and transmission electron microscopy (TEM). When studying induced damage by FC, cells were labeled with fluorescein diacetate (FDA) and propidium iodide (PI) to monitor membrane integrity and esterase activity. UV-C/H provoked up to 4.7 log-reductions of S. cerevisiae; whereas, only 2.6–3.3 log-reductions were achieved by single UV-C and H treatments. FC revealed a shift with treatment time from cells with esterase activity and intact membrane to cells with permeabilized membrane. This shift was more noticeable in peptone water and UV-C/H treated juice. In the UV-C treated juice, double stained cells were detected, suggesting the possibility of being sub-lethally damaged, with compromised membrane but still metabolically active. TEM images of treated cells revealed severe damage, encompassing coagulated inner content, disorganized lumen and cell debris. FC and TEM provided additional information regarding degree and type of damage, complementing information revealed by the traditional plate count technique. © 2018 Elsevier Ltd 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07400020_v73_n_p1_GarciaCarrillo http://hdl.handle.net/20.500.12110/paper_07400020_v73_n_p1_GarciaCarrillo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Flow cytometry Mild heat Transmission electron microscopy UV-C light carrot chemistry evaluation study flow cytometry food preservation fruit and vegetable juice growth, development and aging heat microbial viability microbiology procedures radiation response Saccharomyces cerevisiae sweet orange transmission electron microscopy ultrastructure ultraviolet radiation Citrus sinensis Daucus carota Flow Cytometry Food Preservation Fruit and Vegetable Juices Hot Temperature Microbial Viability Microscopy, Electron, Transmission Saccharomyces cerevisiae Ultraviolet Rays |
| spellingShingle |
Flow cytometry Mild heat Transmission electron microscopy UV-C light carrot chemistry evaluation study flow cytometry food preservation fruit and vegetable juice growth, development and aging heat microbial viability microbiology procedures radiation response Saccharomyces cerevisiae sweet orange transmission electron microscopy ultrastructure ultraviolet radiation Citrus sinensis Daucus carota Flow Cytometry Food Preservation Fruit and Vegetable Juices Hot Temperature Microbial Viability Microscopy, Electron, Transmission Saccharomyces cerevisiae Ultraviolet Rays Effectiveness of UV-C light assisted by mild heat on Saccharomyces cerevisiae KE 162 inactivation in carrot-orange juice blend studied by flow cytometry and transmission electron microscopy |
| topic_facet |
Flow cytometry Mild heat Transmission electron microscopy UV-C light carrot chemistry evaluation study flow cytometry food preservation fruit and vegetable juice growth, development and aging heat microbial viability microbiology procedures radiation response Saccharomyces cerevisiae sweet orange transmission electron microscopy ultrastructure ultraviolet radiation Citrus sinensis Daucus carota Flow Cytometry Food Preservation Fruit and Vegetable Juices Hot Temperature Microbial Viability Microscopy, Electron, Transmission Saccharomyces cerevisiae Ultraviolet Rays |
| description |
The aim of this study was to analyze the effectiveness of UV-C light (0–10.6 kJ/m2) assisted by mild heat treatment (50 °C) on the inactivation of Saccharomyces cerevisiae KE 162 in peptone water and fresh carrot-orange juice blend (pH: 3.8; 9.8°Brix; 707 NTU; absorption coefficient: 0.17 cm−1). Yeast induced damage by single UV-C and mild heat (H) and the combined treatment UV-C/H, was investigated by flow cytometry (FC) and transmission electron microscopy (TEM). When studying induced damage by FC, cells were labeled with fluorescein diacetate (FDA) and propidium iodide (PI) to monitor membrane integrity and esterase activity. UV-C/H provoked up to 4.7 log-reductions of S. cerevisiae; whereas, only 2.6–3.3 log-reductions were achieved by single UV-C and H treatments. FC revealed a shift with treatment time from cells with esterase activity and intact membrane to cells with permeabilized membrane. This shift was more noticeable in peptone water and UV-C/H treated juice. In the UV-C treated juice, double stained cells were detected, suggesting the possibility of being sub-lethally damaged, with compromised membrane but still metabolically active. TEM images of treated cells revealed severe damage, encompassing coagulated inner content, disorganized lumen and cell debris. FC and TEM provided additional information regarding degree and type of damage, complementing information revealed by the traditional plate count technique. © 2018 Elsevier Ltd |
| title |
Effectiveness of UV-C light assisted by mild heat on Saccharomyces cerevisiae KE 162 inactivation in carrot-orange juice blend studied by flow cytometry and transmission electron microscopy |
| title_short |
Effectiveness of UV-C light assisted by mild heat on Saccharomyces cerevisiae KE 162 inactivation in carrot-orange juice blend studied by flow cytometry and transmission electron microscopy |
| title_full |
Effectiveness of UV-C light assisted by mild heat on Saccharomyces cerevisiae KE 162 inactivation in carrot-orange juice blend studied by flow cytometry and transmission electron microscopy |
| title_fullStr |
Effectiveness of UV-C light assisted by mild heat on Saccharomyces cerevisiae KE 162 inactivation in carrot-orange juice blend studied by flow cytometry and transmission electron microscopy |
| title_full_unstemmed |
Effectiveness of UV-C light assisted by mild heat on Saccharomyces cerevisiae KE 162 inactivation in carrot-orange juice blend studied by flow cytometry and transmission electron microscopy |
| title_sort |
effectiveness of uv-c light assisted by mild heat on saccharomyces cerevisiae ke 162 inactivation in carrot-orange juice blend studied by flow cytometry and transmission electron microscopy |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07400020_v73_n_p1_GarciaCarrillo http://hdl.handle.net/20.500.12110/paper_07400020_v73_n_p1_GarciaCarrillo |
| _version_ |
1840325814175924224 |