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Am. J. Enol. Vitic. 39:1:77-82 (1988)
Copyright © 1988 by the American Society for Enology and Viticulture.
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Glycerol Production by Four Common Grape Molds

R. G. Ravji 1, S. B. Rodriguez 1, and R. J. Thornton 1

1 Department of Microbiology and Genetics, Massey University, Palmerston North, New Zealand.

The production of glycerol by the grape molds Aspergillus niger, Penicillium italicum, Rhizopus nigricans, and Botrytis cinerea growing in juice from Golden Chasselas and Black Hamburg grapes was examined. Juice from both free-run and homogenized whole berries was used together with different air relations and an incubation temperature of 25°C. Samples were taken periodically for analysis of glycerol by HPLC, and the mycelial dry weights of all cultures were determined after 26- to 29-day incubations. Large differences in glycerol production were observed among the molds. R. nigricans and B. cinerea produced more glycerol than A. niger and P. italicum under all conditions of cultivation. B. cinerea produced more mycelial mass than the other three molds under all conditions except in Black Hamburg juice under "anaerobic" conditions.

Key words: grapes, molds, glycerol, HPLC

Submitted on September 2, 1986
Revised on January 29, 1987






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Copyright © 1988 by the American Society for Enology and Viticulture.