Document Detail


Cashew apple bagasse as a source of sugars for ethanol production by Kluyveromyces marxianus CE025.
MedLine Citation:
PMID:  21116682     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The potential of cashew apple bagasse as a source of sugars for ethanol production by Kluyveromyces marxianus CE025 was evaluated in this work. This strain was preliminarily cultivated in a synthetic medium containing glucose and xylose and was able to produce ethanol and xylitol at pH 4.5. Next, cashew apple bagasse hydrolysate (CABH) was prepared by a diluted sulfuric acid pretreatment and used as fermentation media. This hydrolysate is rich in glucose, xylose, and arabinose and contains traces of formic acid and acetic acid. In batch fermentations of CABH at pH 4.5, the strain produced only ethanol. The effects of temperature on the kinetic parameters of ethanol fermentation by K. marxianus CE025 using CABH were also evaluated. Maximum specific growth rate (μ(max)), overall yields of ethanol based on glucose consumption [Formula: see text] and based on glucose + xylose consumption (Y ( P/S )), overall yield of ethanol based on biomass (Y ( P/X )), and ethanol productivity (P (E)) were determined as a function of temperature. Best results of ethanol production were achieved at 30°C, which is also quite close to the optimum temperature for the formation of biomass. The process yielded 12.36 ± 0.06 g l(-1) of ethanol with a volumetric production rate of 0.257 ± 0.002 g l(-1) h(-1) and an ethanol yield of 0.417 ± 0.003 g g(-1) glucose.
Authors:
Maria Valderez Ponte Rocha; Tigressa Helena Soares Rodrigues; Vania M M Melo; Luciana R B Gonçalves; Gorete Ribeiro de Macedo
Publication Detail:
Type:  Journal Article     Date:  2010-11-30
Journal Detail:
Title:  Journal of industrial microbiology & biotechnology     Volume:  38     ISSN:  1476-5535     ISO Abbreviation:  J. Ind. Microbiol. Biotechnol.     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-07-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9705544     Medline TA:  J Ind Microbiol Biotechnol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1099-107     Citation Subset:  IM    
Affiliation:
Departamento de Agrotecnologia e Ciências Sociais, Universidade Federal Rural do Semi-Árido, Av. Francisco Mota, 572, Costa e Silva, Mossoró, RN, 59.625-900, Brazil, valderez@ufersa.edu.br.
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