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The influence of adaptive stresses on the survival of spray-dried Lactococcus lactis cells

Published online by Cambridge University Press:  04 September 2020

Débora C. Cnossen
Affiliation:
Departamento de Tecnologia de Alimentos (DTA), Universidade Federal de Viçosa (UFV), Viçosa, MG, Brazil
Ramila Cristiane Rodrigues
Affiliation:
Departamento de Tecnologia de Alimentos (DTA), Universidade Federal de Viçosa (UFV), Viçosa, MG, Brazil
Evandro Martins*
Affiliation:
Departamento de Tecnologia de Alimentos (DTA), Universidade Federal de Viçosa (UFV), Viçosa, MG, Brazil
José de Castro Cezarino Junior
Affiliation:
Departamento de Tecnologia de Alimentos (DTA), Universidade Federal de Viçosa (UFV), Viçosa, MG, Brazil
Antônio Fernandes de Carvalho
Affiliation:
Departamento de Tecnologia de Alimentos (DTA), Universidade Federal de Viçosa (UFV), Viçosa, MG, Brazil
*
Author for correspondence: Evandro Martins, Email: evandrombi@yahoo.com.br

Abstract

The research described in this technical research communication examines the hypothesis that sublethal stress conditions can improve the survival of Lactococcus lactis subsp. lactis during drying and subsequent storage. After drying, the L. lactis that had adapted to acid or osmotic stresses did not differ statistically in terms of cell viability loss compared to the control samples tested (~0.38 log cycles). However, the cells that had adapted to oxidative conditions demonstrated a cell viability loss of only 0.01 log cycles. After 45 d of storage at temperatures of 4 and 25 °C, the final L. lactis sample populations were shown to be higher (112.5%) when they had been submitted to sublethal conditions of oxidative stress. When the cell samples were exposed to acid stress conditions, they exhibited a viability loss (0.82 log cycles) that was statistically different from the control sample (0.58 log cycles) after 45 d. Osmotic stress conditions did not demonstrate any influence over cell survival rates. Thus, submitting cells to oxidative stress conditions prior to storage has been shown to be a potential strategy for producing dehydrated cultures of L. lactis strains that are less sensitive to oxygen exposure.

Type
Research Article
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of Hannah Dairy Research Foundation

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