Negative H2S character and flocculation as yeast strain markers for inoculum recovery

Scientia Agricola

Carlos Alberto França Ribeiro²  Jorge Horii¹ 

[1] ,Universidade de Ribeirão PretoRibeirão Preto SP ,Brasil

关键词: cell recovery;    hydrogen sulfide;    ethanolic fermentation;    quality control;    reciclo de células;    controle de qualidade;    ácido sulfídrico;    fermentação alcoólica;   

DOI  :  10.1590/S0103-90162004000300009

来源: SciELO

【 摘 要 】

Routine identification of yeast behavior is essential to measure the control of the alcohol production process and to maintain product quality standards. This work utilized the non-hydrogen sulfide production and flocculation traits as characteristic strain markers for the evaluation of cell recycling during the alcoholic fermentation process for production of sugarcane alcohol. This study evaluated the behavior of a recombinant yeast bank made by protoplast fusion, for strain screening purposes; strain fermentative kinetics in comparison to commercial baker yeast; viability and recovery of the selected strain on differential media, after five consecutive fermentation batches; and the recovery of the selected strain from fermentation with mixed strain cultures. The strain selected for the H2S negative character kept its viability during successive recyclings, with contamination levels not detected by the method of analysis. It also presented a kinetic behavior similar to that of baker yeast, either in single or mixed culture fermentations, opening new possibilities for further work on quality control of cell recycling in the alcoholic fermentation process.

【 授权许可】

CC BY   
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