Subcritical Water Extraction of Barley to Produce a Functional Drink

Abstract

We investigated the effects of various temperatures between 150 and 280 °C during subcritical water extraction of barley to make a barley tea-like extract, a popular summer beverage in Japan. Each barley extract was analyzed for sensory properties, antioxidative activity, and the amount of residual matter, which revealed 205 °C to be the best extraction parameter. 5-Hydroxymethyl-2-furaldehyde was found to be the major antioxidative component in the 205 °C extract, along with the formation of several important amino acids.