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Wine production by novel yeast biocatalyst prepared by immobilization on watermelon (Citrullus vulgaris) rind pieces and characterization of volatile compounds

Paper ID Volume ID Publish Year Pages File Format Full-Text
35573 45096 2008 5 PDF Available
Title
Wine production by novel yeast biocatalyst prepared by immobilization on watermelon (Citrullus vulgaris) rind pieces and characterization of volatile compounds
Abstract

A novel yeast biocatalyst was prepared by using watermelon pieces as immobilizing support for yeast, Saccharomyces cerevisiae 101 strain for use in wine production. Immobilization was confirmed by electron microscopy. Suitability of biocatalyst was investigated by using it in repeated batch and continuous fermentations. The fermentation rate and other parameters were compared with free yeast cells at different temperatures. In all cases fermentation time was short (22 h at 30 °C and 80 h at 15 °C) and ethanol productivities were high (4 g/l/h). The volatile compounds, methanol, ethyl acetate, propanol-1, isobutanol and amyl alcohols that formed during fermentation were analyzed with the help of GC-FID. The concentrations of ethyl acetate and methanol were not more than 100 mg/l in all cases, indicating an improvement in the product. Cell metabolism of immobilized yeast was not much affected by immobilization. It was found that the immobilization of yeast on watermelon pieces increased the fermentation rate, vitality and viability of yeast cells. Preliminary sensory tests established the fruity aroma, fine taste and the overall improved quality of the produced wines.

Keywords
Watermelon pieces; Immobilization; Wine production; Repeated batch fermentation; Sensory evaluation
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Wine production by novel yeast biocatalyst prepared by immobilization on watermelon (Citrullus vulgaris) rind pieces and characterization of volatile compounds
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 43, Issue 7, July 2008, Pages 748–752
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us