ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Alcoholic fermentation of apple fruits at various oxygen concentrations. Model prediction and photoacoustic detection.

Peppelenbos, H. W.; Zuckermann, H.; Robat, S. A.;

Postharvest Horticulture Series - Department of Pomology, University of California Year: 1997 Issue: No. 16 Pages: 168-175 Ref: 25 ref.

1997

บทคัดย่อ

Apples (cv. Elstar) were stored at various O2 concentrations, ranging between normoxia and anoxia. Gas exchange rates were measured and the production of acetaldehyde and ethanol were detected using a photoacoustic technique. A gas exchange model, which distinguishes oxidative from fermentative CO2 production, was fitted to the data. The results indicate alcoholic fermentation to be active at all the O2 concentrations used, and increasing in importance when O2 concentrations are lowered. A close relationship was found between model predictions of alcoholic fermentation rates and metabolite production in normoxia and anoxia. In hypoxia, however, the model predicted higher fermentative CO2 production rates in comparison to the fermentative metabolites found. Since the model was fitted to actual CO2 production data, this would suggest another source for CO2 in hypoxia in addition to alcoholic fermentation and respiration. When different pathways are involved in the release of CO2, it questions the

use of simple Michaelis-Menten kinetics for the description of CO2 production.