Abstract
Grape seed, pomegranate seed, green tea, and black tea extracts were used to inhibit the off-odor from citral degradation. A 0.1 M citrate buffer (pH 3), containing 100 ppm citral and 200 ppm gallic acid equivalent plant extract, was incubated at 40°C. The reaction mixtures were analyzed by high-performance liquid chromatography (HPLC) at days 0, 6, 10, 13, and 16 to monitor degradation of citral and formation of α, p-dimethylstyrene, p-cymene-8-ol, and p-methylacetophenone. The addition of plant phenolic extracts could not inhibit citral degradation, however, all four plant extracts significantly inhibited p-methylacetophenone formation. The samples, with the addition of plant extracts, exhibited higher concentrations of α, p-dimethylstyrene and p-cymene-8-ol than the control. This is presumed to be due to the oxygen-scavenging effect of plant extracts blocking the pathway from p-cymene-8-ol to p-methylacetophenone. Our results suggest that these plant extracts act as general antioxidants inhibiting the generation of p-methylacetophenone regardless of the types of water-soluble phenolic compounds existing in the plant extracts.
Original language | English (US) |
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Pages (from-to) | 308-317 |
Number of pages | 10 |
Journal | Molecular Nutrition and Food Research |
Volume | 48 |
Issue number | 4 |
DOIs | |
State | Published - Sep 2004 |
All Science Journal Classification (ASJC) codes
- Biotechnology
- Food Science
Keywords
- Antioxidant
- Citral degradation
- Off-odor
- Phenolic compounds