Browning index was determined using the method described
by Krishnan et al. (2010) with slight modification. One gram of
dehydrated kimchi powder was extracted with 40 mL of distilled
water and 10 mL of 10% trichloroacetic solution in a beaker. The
extract was filtered through a Buchner funnel with Whatman No.
2 filter paper. After the solution stood for 2 hours at room temperature,
its concentration was determined based on its absorbance
at 420 nm (Optizen 2120UV, Mecasys, Korea).