건조방법에 따른 잣솔잎 분말 추출액의 항산화특성

Korean pine needles have long been used in traditional Korean herbal medicine. Hence, pine needle extract was prepared as powder using 50% ethanol extraction followed by various drying methods such as hot-air drying, vacuum drying, and freeze drying. With these extracts, the effects of the drying methods on the total phenolic content and antioxidant activities were assessed. As a result, vacuum drying resulted in the highest yield, whereas hot-air dried extract contained the least amount of total phenolic compounds. However, the extracts by hot-air drying showed the highest amount of total flavonoids in comparison with the extracts obtained by other drying methods (p<0.05). In case of freeze dried samples, there was much stronger 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2’-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid (ABTS) radical scavenging activities than in other samples (p<0.05). The nitrate scavenging activities of all samples at high acidic conditions were higher than 80%, and that of the vacuum dried sample showed a significantly higher value (p<0.05). t-Cinnamic acid was the major phenolic acid regardless of drying method applied.