Evaluation of the Fermentative Capacity of Saccharomyces cerevisiae CAT-1 and BB9 Strains and Pichia kudriavzevii BB2 at
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ORIGINAL RESEARCH ARTICLE
Evaluation of the Fermentative Capacity of Saccharomyces cerevisiae CAT-1 and BB9 Strains and Pichia kudriavzevii BB2 at Simulated Industrial Conditions Adriana Menezes Olivo Fernandes1 • Nayara Fernanda Lisboˆa Garcia1 • Gustavo Graciano Fonseca2 • Rodrigo Simo˜es Ribeiro Leite1 • Marcelo Fossa da Paz1
Received: 13 February 2020 / Accepted: 29 May 2020 Ó Association of Microbiologists of India 2020
Abstract The search for promising yeasts that surpass the fermentative capacity of commercial strains, such as Saccharomyces cerevisiae CAT-1, is of great importance for industrial ethanol processes in the world. Two yeasts, Pichia kudriavzevii BB2 and Saccharomyces cerevisiae BB9, were evaluated in comparison to the industrial yeast S. cerevisiae CAT-1. The objective was to evaluate the performance profile of the three studied strains in terms of growth, substrate consumption, and metabolite formation, aiming to determine their behaviour in different media and pH conditions. The results showed that under cultivation conditions simulating the medium used in the industrial process (must at 22° Brix at pH 3.0) the highest ethanol productivity was 0.41 g L-1 h-1 for S. cerevisiae CAT-1, compared to 0.11 g L-1 h-1 and 0.16 g L-1 h-1 for P. kudriavzevii and S. cerevisiae BB2, respectively. S. cerevisiae CAT-1 produced three times more ethanol in must at pH 3.0 (28.30 g L-1) and in mineral medium at pH 3.0 (29.17 g L-1) and 5.0 (30.70 g L-1) when compared to the value obtained in sugarcane must pH 3.0 (9.89 g L-1). It was concluded that S. cerevisiae CAT-1 was not limited by the variation in pH in the mineral medium due to its Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12088-020-00891-6) contains supplementary material, which is available to authorized users. & Marcelo Fossa da Paz [email protected] 1
Laboratory of Applied Biotechnology, Faculty of Biological and Environmental Sciences, Federal University of Grande Dourados, Rodovia Dourados/Itahum, Km 12, Dourados, MS CEP 79.804-970, Brazil
2
Laboratory of Bioengineering, Faculty of Biological and Environmental Sciences, Federal University of Grande Dourados, Dourados, MS, Brazil
nutritional composition, guaranteeing better performance of the yeast even in the presence of stressors. Only S. cerevisiae CAT-1 expressed he constitutive invertase enzyme, which is responsible for hydrolysing the sucrose contained in the must. Keywords Sugar consumption Must Mineral medium Invertase Process condition
Introduction There are two types of energy: non-renewable and renewable. The major non-renewable energy resources are coal, hydrocarbons (petroleum and natural gases), and nuclear processes. On the other hand, renewable energy cannot be depleted, or it can be replenished within a human’s lifetime. Bioenergy, a type of renewable energy, is produced from biological material (including plants, animals, and their by-products) called biomass. Bioenergy can be utilised to generate heat, electr
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