Effect of liquefaction enzymes on methanol concentration of distilled fruit spirits

Johnny I. Andraous, Michael J. Claus, Deirdre J. Lindemann, Kris A. Berglund

Research output: Contribution to journalArticle

  • 11 Citations

Abstract

Liquefaction enzymes are often used during fermentation of fruit mashes to improve the yield of ethanol and the ability to pump the mash. The liquefaction enzymes hydrolyze pectin, but in addition to the desired pectin hydrolysis activity, the enzymes also have pectinesterase activity which hydrolyzes the methyl ester in pectin resulting in methanol formation. Fermentations of various apple varieties and Bartlett pears were conducted using liquefaction enzymes. The resulting distilled products contained concentrations of methanol above the legal limit of 280 mg/100 mL of 40% ethanol, with the observed methanol concentrations in a range between 320 and 656 mg/100 mL of 40% ethanol. In contrast to the undesired increase in methanol concentration, the enzymes provide only a marginal increase in ethanol yield. The results indicate that liquefaction enzymes should be used with caution for pomace fruit and that methanol monitoring should be implemented if these enzymes are used for commercial products.

LanguageEnglish (US)
Pages199-201
Number of pages3
JournalAmerican Journal of Enology and Viticulture
Volume55
Issue number2
StatePublished - 2004

Profile

Methanol
Fruit
methanol
fruits
Enzymes
enzymes
ethanol
pectins
Ethanol
mash
Fermentation
fermentation
pomace
pectinesterase
Pyrus
pumps
pears
Malus
liquefaction
apples

Keywords

  • Distilled spirits
  • Eau-de-vie
  • Ethanol
  • Fruit brandy
  • Pectin
  • Pectinesterase

ASJC Scopus subject areas

  • Food Science
  • Horticulture
  • Biotechnology

Cite this

Effect of liquefaction enzymes on methanol concentration of distilled fruit spirits. / Andraous, Johnny I.; Claus, Michael J.; Lindemann, Deirdre J.; Berglund, Kris A.

In: American Journal of Enology and Viticulture, Vol. 55, No. 2, 2004, p. 199-201.

Research output: Contribution to journalArticle

Andraous, Johnny I. ; Claus, Michael J. ; Lindemann, Deirdre J. ; Berglund, Kris A./ Effect of liquefaction enzymes on methanol concentration of distilled fruit spirits. In: American Journal of Enology and Viticulture. 2004 ; Vol. 55, No. 2. pp. 199-201
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