Stimulation of ethanol production by Maillard reaction products using different yeast concentrations

Abstract

Back-slopping or recycling of distillery slop is an alternative method of handling and managing wastewater from distilleries. Using fresh distillery slop as diluent for molasses fermentation is a promising technology that needs elaboration, such as the effect of its components on the efficiency of ethanol fermentation. A colorant like melanoidin, a Maillard reaction product, is one such component. The effect of synthetic melanoidin solution on ethanol fermentation efficiency was studied in the laboratory. Maximum fermentation efficiencies of 63.53 per cent, 90.50 per cent, and 82.45 per cent were obtained at 1.4 per cent melanoidin with the use of 10, 20 and 30 g L-1 yeast concentrations, respectively. Results of statistical analysis showed significant differences in efficiencies at 5 per cent level of significance. Addition of melanoidin increased alcohol fermentation. The yeasts tolerated melanoidin concentrations up to 2.1 per cent. The presence of unreacted glucose in the melanoidin solution signified incomplete conversion of amino-sugars to melanoidin. Findings imply that distillery slops containing melanoidins may be recycled up to five times without any harmful effect on the yeast.

Source or Periodical Title

Philippine Agricultural Scientist

ISSN

317454

Page

419-424

Document Type

Article

Subject

Alcohol, Brix, Efficiency, Fermentation, Glucose, Melanoidin, Slops, Sucrose, Yeast

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