Abstract
The volatiles developed from dehydrated onion during rehydration with water or 1g/l cysteine solution were trapped on a porous polymer, Tenax-GC, and analyzed by an on-column entrainment gas chromatography procedure. Rehydration temperatures of 22 and 40°C, and four “sampling-trapping” times were investigated. Samples rehydrated with cysteine solution generally gave less total volatiles when the sampling-trapping period was 15, 30 and 60min and more after 2 hours than water rehydrated samples. Propionaldehyde, 1-propanol and 1-propanethiol contents were always higher in samples rehydrated with water. The plausible reactions responsible for the observed effect of cysteine are discussed.
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