Water solubility index (WSI) and water absorption index (WAI)
were determined according to the method described by Anderson
et al. (1969). Two and a half grams of kimchi powder and 30 mL
water were vigorously mixed in a 50 mL centrifuge tube; the
mixture was incubated in a water bath at 30 °C for 30 min, and
centrifuged at 3000 g for 15 min. The supernatant was collected
in a pre-weighed Petri dish and the residue was weighed after
oven drying at 105 °C overnight. The amount of solids in the dried
supernatant as a percentage of the total dry solid pellet remaining
after centrifugation was divided by the amount of dry sample. WAI
and WSI were calculated by: