Response to stress conditions of microorganisms treated with natural antimicrobials in cheese whey

Cheese whey is a by-product that recently has gained attention because it represents a source of food ingredients of high nutritive value. It is generally processed by ultra filtration and spray drying to produce whey powder and protein concentrates. However, the concentrated fluid obtained from the...

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Publicado: 2011
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97816120_v_n_p249_vonStaszewski
http://hdl.handle.net/20.500.12110/paper_97816120_v_n_p249_vonStaszewski
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_97816120_v_n_p249_vonStaszewski
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spelling paper:paper_97816120_v_n_p249_vonStaszewski2023-06-08T16:38:15Z Response to stress conditions of microorganisms treated with natural antimicrobials in cheese whey Cheese whey is a by-product that recently has gained attention because it represents a source of food ingredients of high nutritive value. It is generally processed by ultra filtration and spray drying to produce whey powder and protein concentrates. However, the concentrated fluid obtained from the membrane process could be used directly in the formulation of foods if it maintains a proper microbial stability, avoiding the drying process which can be rather expensive and affects the nutritional and functional properties. Food-processing methods have been developed to interfere with bacterial homeostasis, prevent growth, or kill food-borne pathogens. The growing demand for fresh, minimally processed foods by consumers had led to the need for natural food preservation methods such as the use of natural antimicrobials and combination with other hurdles, without adverse effects on the consumer or the food itself. Additionally, natural antimicrobials can be used alone or in combination with other non-thermal technologies, but it has also been demonstrated that microorganisms can display tolerance to these factors when they are applied in sub-lethal concentrations. Thus, it may be useful to assess whether pre-treatments with natural antimicrobials like green tea extract, MicrogardTM or nisin, would enhance sensitivity or resistance of food-borne bacteria to different stress conditions, such as acidity, heat, hydrogen peroxide or salt addition, which are commonly applied in food-processing methods. For this purpose different techniques were used in order to evaluate possible membrane damages produced by the combined treatments. The results of this study revealed that the bacterial reduction when applying stress conditions was improved in most of the cases after exposure to natural antimicrobials in liquid cheese whey. Synergistic effects are important to minimize the concentration of additives required to achieve a particular antibacterial effect without adversely affecting the sensorial acceptability. This knowledge about the interactions between natural antimicrobials and stressors has important implications for the food industry when considering which food preservation regime is the best to adopt. © 2011 by Nova Science Publishers, Inc. All rights reserved. All rights reserved. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97816120_v_n_p249_vonStaszewski http://hdl.handle.net/20.500.12110/paper_97816120_v_n_p249_vonStaszewski
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Cheese whey is a by-product that recently has gained attention because it represents a source of food ingredients of high nutritive value. It is generally processed by ultra filtration and spray drying to produce whey powder and protein concentrates. However, the concentrated fluid obtained from the membrane process could be used directly in the formulation of foods if it maintains a proper microbial stability, avoiding the drying process which can be rather expensive and affects the nutritional and functional properties. Food-processing methods have been developed to interfere with bacterial homeostasis, prevent growth, or kill food-borne pathogens. The growing demand for fresh, minimally processed foods by consumers had led to the need for natural food preservation methods such as the use of natural antimicrobials and combination with other hurdles, without adverse effects on the consumer or the food itself. Additionally, natural antimicrobials can be used alone or in combination with other non-thermal technologies, but it has also been demonstrated that microorganisms can display tolerance to these factors when they are applied in sub-lethal concentrations. Thus, it may be useful to assess whether pre-treatments with natural antimicrobials like green tea extract, MicrogardTM or nisin, would enhance sensitivity or resistance of food-borne bacteria to different stress conditions, such as acidity, heat, hydrogen peroxide or salt addition, which are commonly applied in food-processing methods. For this purpose different techniques were used in order to evaluate possible membrane damages produced by the combined treatments. The results of this study revealed that the bacterial reduction when applying stress conditions was improved in most of the cases after exposure to natural antimicrobials in liquid cheese whey. Synergistic effects are important to minimize the concentration of additives required to achieve a particular antibacterial effect without adversely affecting the sensorial acceptability. This knowledge about the interactions between natural antimicrobials and stressors has important implications for the food industry when considering which food preservation regime is the best to adopt. © 2011 by Nova Science Publishers, Inc. All rights reserved. All rights reserved.
title Response to stress conditions of microorganisms treated with natural antimicrobials in cheese whey
spellingShingle Response to stress conditions of microorganisms treated with natural antimicrobials in cheese whey
title_short Response to stress conditions of microorganisms treated with natural antimicrobials in cheese whey
title_full Response to stress conditions of microorganisms treated with natural antimicrobials in cheese whey
title_fullStr Response to stress conditions of microorganisms treated with natural antimicrobials in cheese whey
title_full_unstemmed Response to stress conditions of microorganisms treated with natural antimicrobials in cheese whey
title_sort response to stress conditions of microorganisms treated with natural antimicrobials in cheese whey
publishDate 2011
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97816120_v_n_p249_vonStaszewski
http://hdl.handle.net/20.500.12110/paper_97816120_v_n_p249_vonStaszewski
_version_ 1768542291822116864

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