Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7590918 | Food Chemistry | 2015 | 5 Pages |
Abstract
Post-harvest treatment can influence levels of secondary metabolites in fruits and vegetables. Onions contain high levels of quercetin but are commonly heat-treated before consumption. Hence, the objective of this study was to examine the effect of cooking treatments on the flavonoid (3,4â²-Qdg and 4â²-Qmg) concentrations in onion and to determine, by simulation modelling, probable human exposure. Onion samples (n = 3) were cooked using three processes (fry, bake and steam) for three time intervals (5, 10 and 15 min). Frying (<10 min) was the ideal cooking method which retained concentrations of 3,4â²-Qdg and 4â²-Qmg at >50%. Thermal processing (>10 min) was shown to decrease quercetin content in all samples. The simulation model predicted human absorption and exposure. Steaming (15 min) resulted in the lowest quercetin exposure, with mean values of 4000 and 400 μg/day for 3,4â²-Qdg and 4â²-Qmg, respectively. Untreated onions had mean exposures of 14,000 and 3000 μg/day for 3,4â²-Qdg and 4â²-Qmg, respectively.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
S. Harris, N. Brunton, U. Tiwari, E. Cummins,