白蒿挥发油成分的测定及其抗氧化活性分析

采用乙醇浸提法提取生长期和花果期白蒿的挥发油,通过正交实验确定最佳提取条件为:提取3次、浸提90 min、对于生长期和花果期白蒿液料比分别为10 mL:1 g和8 mL:1 g.通过红外光谱和液相色谱-质谱联用分析了产物的主要成分,生长期白蒿挥发油的主要成分为桉树脑、樟脑、右旋龙脑、石竹烯、Cadina-1,4-diene、白菖烯、棕榈酸乙酯等;花果期白蒿挥发油的主要成分为樟脑、石竹烯、龙脑、甲酸橙花酯等.通过1,1-二苯基-2-三硝基苯肼(DPPH)自由基清除实验对产物的自由基清除活性进行了测定,生长期和花果期白蒿挥发油对0.05 mmol/L DPPH溶液的IC50值分别为0.40和1.66 mg/mL.研究结果表明,乙醇浸提的生长期和花果期白蒿的挥发油具有较好的抗氧化活性.

Components and Their Antioxidant Activity of Essential Oil of Herba Artimisiae Sieversianae from Different Growth Periods

The effective exploitation of natural products is of great significance. Herein the essential oil from Herba Artimisiae Sieversianae in growth period and flower/ fruit bearing period was extracted by ethanol extraction method. The optimal extraction condition was determined by orthogonal experiment, including extracting 3 times, soaking for 90 min, and the ratios of liquid to solid for Herba Artimisiae Sieversianae in growth period and flower/ fruit bearing period were 10 mL : 1 g and 8 mL : 1 g, respectively. The main components of the products were confirmed by FT-IR and GC-MS, which were cineole, camphor, d-borneol, caryophyllene, cadina-1, 4-diene, calamenene, ethyl palmitate, etc. in herba artimisiae sieversianae in growth period, and camphor, caryophyllene, borneol, neryl formate, etc. in Herba Artimisiae Sieversianae in flower/ fruit bearing period. The radical scavenging activity of the products was determined. The results showed that the IC50 values of the essential oil from Herba Artimisiae Sieversianae in growth period and flower/fruit bearing period for 0. 05 mmol/ L DPPH solution were 0. 40 mg / mL and 1. 66 mg / mL, respectively. The essential oil extracted by ethanol from Herba Artimisiae Sieversianae was confirmed to possess good antioxidant activity.