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http://dx.doi.org/10.9721/KJFST.2019.51.1.7

Reverse osmosis causes change in volatile compounds in onion juice  

Shim, Zen (Sempio Fermentation Research Center)
Jeon, Myeong-Hee (Sempio Fermentation Research Center)
Lee, Dae-Hee (Sempio Fermentation Research Center)
Kim, Yong-Seok (Department of Food Science and Technology, Ewha Womans University)
Lee, Sang-Mi (Department of Food Science and Technology, Ewha Womans University)
Choi, Jung-Min (Department of Food Science and Technology, Ewha Womans University)
Jang, Eun-Ji (Department of Food Science and Technology, Ewha Womans University)
Publication Information
Korean Journal of Food Science and Technology / v.51, no.1, 2019 , pp. 7-11 More about this Journal
Abstract
Reverse osmosis (RO) was applied to onion juice to produce concentrated onion juice with improved flavor. The volatile compound profiles of concentrated onion juice and onion juice were compared using solvent-assisted flavor evaporation followed by gas chromatography-mass spectrometry. Onion juice and RO-concentrated onion juice contained 48 and 62 distinct volatile compounds, respectively, and included alcohols, aldehydes, esters, terpenes, furans, ketones, acids, hydrocarbons, and sulfur-containing compounds. The RO-concentrated onion juice contained a greater number of volatile flavor compounds than did onion juice. Notably, sulfur-containing compounds, which are characteristic volatile flavor compounds in raw onions, were more abundant in the RO-concentrated onion juice than in onion juice. The volatile compound composition indicates that RO-concentration produces good quality onion juice.
Keywords
onion juice; reverse osmosis; volatile compounds; concentration; non-thermal process;
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