Laboratory of Genetics and Biotechnology, EMBRAPA Agroenergy, Parque Estação Biológica, PqEB - W3 Norte Final s/no. 70., Brasília, DF, 770-901, Brazil.
Graduate Program of Chemical and Biological Technologies, Institute of Chemistry, University of Brasília, Brasília, Brazil.
Braz J Microbiol. 2021 Jun;52(2):575-586. doi: 10.1007/s42770-021-00489-0. Epub 2021 Apr 6.
Lignocellulosic hydrolysates will also contain compounds that inhibit microbial metabolism, such as organic acids, furaldehydes, and phenolic compounds. Understanding the response of yeasts toward such inhibitors is important to the development of different bioprocesses. In this work, the growth capacity of 7 industrial Saccharomyces cerevisiae and 7 non-Saccharomyces yeasts was compared in the presence of 3 different concentrations of furaldehydes (furfural and 5-hydroxymetil-furfural), organic acids (acetic and formic acids), and phenolic compounds (vanillin, syringaldehyde, ferulic, and coumaric acids). Then, Candida tropicalis JA2, Meyerozyma caribbica JA9, Wickerhamomyces anomalus 740, S. cerevisiae JP1, B1.1, and G06 were selected for fermentation in presence of acetic acid, HMF, and vanillin because they proved to be most tolerant to the tested compounds, while Spathaspora sp. JA1 because its xylose consumption rate. The results obtained showed a dose-dependent response of the yeasts toward the eight different inhibitors. Among the compared yeasts, S. cerevisiae strains presented higher tolerance than non-Saccharomyces, 3 of them with the highest tolerance among all. Regarding the non-Saccharomyces yeasts, C. tropicalis JA2 and W. anomalus 740 appeared as the most tolerant, whereas Spathaspora strains appeared very sensitive to the different compounds.
木质纤维素水解物还将包含抑制微生物代谢的化合物,如有机酸、糠醛和酚类化合物。了解酵母对这些抑制剂的反应对于不同生物过程的发展非常重要。在这项工作中,比较了 7 种工业酿酒酵母和 7 种非酿酒酵母在 3 种不同浓度的糠醛(糠醛和 5-羟甲基糠醛)、有机酸(乙酸和甲酸)和酚类化合物(香草醛、丁香醛、阿魏酸和香豆酸)存在下的生长能力。然后,选择热带假丝酵母 JA2、卡氏毕赤酵母 JA9、异常威克汉姆酵母 740、酿酒酵母 JP1、B1.1 和 G06 在存在乙酸、HMF 和香草醛的情况下进行发酵,因为它们被证明对测试化合物具有最高的耐受性,而 Spathaspora sp. JA1 因为其木糖消耗率。所得结果表明,酵母对 8 种不同抑制剂的反应呈剂量依赖性。在所比较的酵母中,酿酒酵母菌株比非酿酒酵母具有更高的耐受性,其中 3 种菌株具有所有菌株中最高的耐受性。关于非酿酒酵母,热带假丝酵母 JA2 和异常威克汉姆酵母 740 表现出最高的耐受性,而 Spathaspora 菌株对不同化合物非常敏感。
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