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http://dx.doi.org/10.9721/KJFST.2014.46.2.189

Effects of Heat Treatment on the Quality of the Onion Juices Prepared with Sulfur-applied Onions  

Choi, Bogyoung (Department of Food and Nutrition, Kangwon National University)
Surh, Jeonghee (Department of Food and Nutrition, Kangwon National University)
Publication Information
Korean Journal of Food Science and Technology / v.46, no.2, 2014 , pp. 189-197 More about this Journal
Abstract
Onion juices were prepared by various heat treatments (at $105-120^{\circ}C$ for 4.5-5.5 h), from the onions cultivated with increasing numbers of sulfur applications (once for Sulfur-1, four times for Sulfur-4). As heat treatment intensity increased, the onion juices darkened (p<0.001), which adversely affected the sensory preference. In addition, increasing the heating temperature significantly increased the organic acid content of onion juices (p<0.001), and therefore, decreased pH (p<0.001). Heat intensity did not affect the thiosulfinate content of onion juices, suggesting that the rate of decomposition of thiosulfinate into low-molecular weight sulfur derivatives is similar over the temperature range of $105-120^{\circ}C$. Total flavonoids were higher in onion juices derived from Sulfur-4 than in Sulfur-1 onions, and increased with heat treatment intensity (p<0.001). These results indicated that heat-facilitated conversion of bound forms of flavonoids to their free forms increases the extractability of flavonoids from onions.
Keywords
onion; sulfur; heat; thiosulfinate; flavonoid;
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