GRAPE JAM WITH INCREASED ANTIOXIDANT ACTIVITIES THROUGH INFRARED RADIATION

摘要

PURPOSE: A grape jam with increased antioxidant activity and a preparation method thereof are provided to inhibit oxidation during preservation, thereby exhibiting pleasing taste and flavor. CONSTITUTION: A method for preparing a grape jam comprises the following steps of: irradiating far infrared rays to grapes; and drying the irradiated grapes to obtain the grape jam with increased antioxidant activity. The far infrared rays emit a wavelength within a range of 2 ~ 14 μm. The far infrared rays are irradiated to the grapes at 40 ~ 120°C for 5-60 minutes. The increase in antioxidant activity represents the increase in polyphenol content or in DPPH free radical removal activity.