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Kinetics of xylitol fermentation by Candida guilliermondii grown on rice straw hemicellulosic hydrolysate |
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| Authors: | Inês C Roberto Ismael M de Mancilha Sunao Sato |
| Institution: | 1. Department of Biotechnology, Faculty of Chemical Engineering of Lorena, 12600-000, Lorena, SP, Brazil 2. Food Science Department, Federal University of Vi?osa, Brazil 3. Faculty of Pharmaceutical Sciences, University of S?o Paulo, Brazil |
| Abstract: | The fermentation kinetics for the conversion of rice straw hemicellulosic hydrolysate to xylitol by the yeast Candida guilliermondii was evaluated under batch conditions. The fermentation was accomplished in a 1 L working volume stirred-tank reactor with aeration of 1.3 vvm and agitation of 300 rpm (kLa=15/h). The maximum specific rate of xylitol formation (0.12 g/g) was achieved when the specific growth rate was lowered to 1/5 of its highest value. From analysis of the fermentation kinetics, a linear correlation between specific growth rate (μx) and specific rate of xylitol formation (qp) was evident. Based on the Gaden model, this bioprocess was classified as growth-associated production and the relationship between μx and qp can be described by the equation qp=6.31μx. |
| Keywords: | Rice straw xylitol fermentation kinetics Candida guilliermondii |
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