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Type: Artigo de periódico
Title: Effect of lecithin and soy oil on the fermentative performance of Saccharomyces uvarum I Z 1904
Author: Duarte, MCT
Serzedello, A
Serra, GE
deFaveri, MC
deOliveira, L
Ponezi, AN
Sartoratto, A
Abstract: The proposal of this work was to study the effects of lecithin and soy oil on the fermentative performance of Saccharomyces tn,arum I Z 1904, a yeast used in the industrial production of ethanol. High Test Molasses (HTM) was chosen as the fermentation media because it is a substratum that is poor in nutrients, and because it permits one to distinguish the action of lipids from other nutritional factors. The study of the optimization of the concentration of lipids by surface response analysis showed that the lipids favor the performance of the yeast principally when applied separately. Maximum concentrations of the two sources of lipids in the media stimulated the budding rate but did not constitute a protection against cell death. Considering the action of lipids on the cellular parameters studied, the supplementation of the media with 3.0 g/l of soy oil permitted the obtention of maximum responses of cellular viability, budding rate and viability of the buds after 6 successive cycles. In relation to the fermentative parameters, the use of 1.5 g/l of soy oil provided high yields and an equilibrium between the mass of ethanol produced (EM) and the alcoholic yield (Y-p/s), whereas the cellular viability after 6 cycles did not differ statistically from that observed with 3g/l of oil.
Subject: Saccharomyces
lipids metabolism
soy oil
soy lecithin
Country: Brasil
Editor: Soc Brasileira Microbiologia
Citation: Revista De Microbiologia. Soc Brasileira Microbiologia, v. 27, n. 4, n. 255, n. 262, 1996.
Rights: aberto
Date Issue: 1996
Appears in Collections:Unicamp - Artigos e Outros Documentos

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