Change of Korean Ginseng Components with High Temperature and Pressure Treatment

摘要

Korean ginseng was heat treated at various temperatures (110, 120, 130, 140 and 150 deg C) and times (1, 2, 3, 4, and 5 hr). The heat treated ginseng extract was analyzed for the total polyphenol content, total flavonoid content, DPPH free-radical scavenging, 5-HMF and ginsenoside. The total phenolics and flavonoid content increased with increasing treatment temperature and time. The highest total phenolics content was 29.46 mg/g (d.b) in 150 deg C for 1 hr (control: 2.68 mg/g). The highest total flavonoid content was 4.75 mg/g (d.b) in 150 deg C for 2hr (control: 0.39 mg/g). The antioxidant activity increased until 140 deg C for 3 hours. An extension of the treatment time did not have any effect, and the antioxidant activity decreased at temperatures higher than 150 deg C for more than 2 hours. The content of ginsenoside Rg_1 Re, Rb_2 and Rb3 rapidly decreased with increasing treatment temperature and time. Ginsenoside Rg_3 and Rh_2 were newly produced, or their contents increased with increasingtreatment temperature and time.