The reducing sugar content in kimchi was measured by
Miller’s (16) colorimetry using dinitrosalicylic acid (DNS).
DNS reagent was added to the dilute solution of kimchi,
the mixture was stirred thoroughly, left 5 minutes for
reaction, and cooled down. For the solution with developed
color, we measured absorbance at 550 nm using a
spectrophotometer (V-550, Jasco Co., Tokyo, Japan) and
converted the result into glucose for presentation