Dangyang Ke
University of California, Davis
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Featured researches published by Dangyang Ke.
Postharvest Biology and Technology | 1993
Mila Mateos; Dangyang Ke; Marita Cantwell; Adel A. Kader
Abstract Intact heads and cut leaf midrib tissue of crisphead lettuce ( Lactuca sativa , L., cv. ‘Salinas’ and ‘Vanguard’) were kept in air or air +5%, 10%, or 20% CO 2 for 10 or 20 days at 2.5°C and then transferred to air at 20°C for 12 hrs to study CO 2 effects on phenolic metabolism and fermentative products. Exposure of cut midribs to 20% CO 2 increased extractable activity of phenylalanine ammonia-lyase (PAL) when assayed at its optimum pH (8.5). However, under the 20% CO 2 treatment PAL activity was reduced as a result of a decrease in cytoplasmic pH. Total phenolic content of cut midribs was reduced under 20% CO 2 -enriched atmosphere probably due to this decrease in PAL activity. The phenolic content rapidly increased after the tissue was transferred from 20% CO 2 at 2.5°C to air at 20°C when cytoplasmic pH returned to its normal value and the PAL activity was restored. Such effects of CO 2 on PAL and phenolics were of lower magnitude in intact heads, probably due to their lower sensitivity to phenolic metabolism. Off-flavor developed in the intact heads exposed to 20% CO 2 , which was associated with increased concentrations of ethanol and acetaldehyde. When exposed to 20% CO 2 , levels of ethanol and acetaldehyde in cut midribs were only about half of those in intact heads.
Journal of Food Science | 1991
Dangyang Ke; L. R. Goldstein; Michael O'Mahony; Adel A. Kader
Journal of The American Society for Horticultural Science | 1990
Dangyang Ke; Adel A. Kader
Journal of The American Society for Horticultural Science | 1994
Dangyang Ke; Elhadi Yahia; Mila Mateos; Adel A. Kader
Journal of The American Society for Horticultural Science | 1994
Dangyang Ke; Lili Zhou; Adel A. Kader
Journal of The American Society for Horticultural Science | 1991
Dangyang Ke; Leonor Rodriguez-Sinobas; Adel A. Kader
Journal of The American Society for Horticultural Science | 1995
Dangyang Ke; Elhadi M. Yahia; Betty Hess; Lili Zhou; Adel A. Kader
Postharvest Biology and Technology | 1993
Dangyang Ke; Mila Mateos; Jingtair Siriphanich; Chingying Li; Adel A. Kader
Journal of The American Society for Horticultural Science | 1990
Dangyang Ke; Hendrik van Gorsel; Adel A. Kader
Journal of The American Society for Horticultural Science | 1992
Dangyang Ke; Adel A. Kader