ISSN: 0973-7510

E-ISSN: 2581-690X

Balakrishnaraja Rengaraju1 , Ramalingam Ponnuswamy2, Sankar Malayandi3 and Vijayakumar Lakshminarayanan1
1Department of Biotechnology, Bannari Amman Institute of Technology, Sathyamangalam – 638401, India.
2Department of Biotechnology, Kumaraguru College of Technology, Coimbatore – 641 006, India.
3Department of Biotechnology, Mepco Schlenk Engineering College, Kariseri – 626 005, India.
J Pure Appl Microbiol. 2014;8(4):3037-3042
© The Author(s). 2014
Received: 18/02/2014 | Accepted: 21/04/2014 | Published: 31/08/2014
Abstract

Xylitol, a natural sweetener, was produced by biotechnological methods using novel yeast which was isolated from sugarcane extracts of Sathyamangalam region, Tamilnadu, India. The yeast was identified based on its morphological, microscopical analysis and 18S rRNA molecular studies. As per the phylogenetic tree’s suggestion, the yeast strain was named as Candida tropicalis isolate Balki1. The partial 18S rRNA sequence was submitted to NCBI Genbank and the accession number KC415251 was assigned. Improved fermentation conditions of xylitol production were found at pH 5, Temperature 30°C & initial xylose concentration 10% (w/v) respectively. Xylose reductase was the key enzyme mediating the xylitol production. The kinetic parameters were estimated as 71.54 mM and 0.696 U/mg of protein for the enzyme xylose reductase. The study suggests that the first reported yeast isolate can be espoused for large scale xylitol production.

Keywords

Xylitol, xylose reductase, Candida tropicalis, XR assay

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