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http://dx.doi.org/10.9721/KJFST.2013.45.4.478

Influence of the Number of Sulfur Applications on the Improvement of the Chemical Composition and Quality of 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.45, no.4, 2013 , pp. 478-487 More about this Journal
Abstract
Onions were treated with different amounts of sulfur (S) during cultivation and examined for their physicochemical properties and flavor. Onions cultivated without S application were the control group; the treatment groups were grown in soil that had been pretreated with S and received additional S applications or four times before harvest. As the number of S applications increased, the levels of crude protein, quantified with total nitrogen; ash, approximating total amounts of minerals; and dietary fiber of the onions tended to increase. The mineral compositions also improved, with noticeable increases in the levels of Mg, K, Fe, and Zn. In particular, the reducing capacity of the onions increased appreciably (p<0.05), without increases in the levels of S-containing compounds such as thiosulfinate or S-containing amino acids. Nevertheless, the spicy hot taste and flavor, which is generated mainly from S-containing compounds, were perceived more strongly in the onions that had received more S applications.
Keywords
onions; sulfur; chemical composition; thiosulfinate; flavor;
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Times Cited By KSCI : 4  (Citation Analysis)
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