余甘子树皮提取物抗氧化及清除自由基活性初步研究

余甘子树皮提取物的主要成分为局部棓酰化的聚原翠雀定-原花青定混合物,具有强抗氧化活性的化学结构特征.试验结果表明,采用超声波强化提取、冷冻絮凝沉降和大孔树脂吸附等方法提取分离获得的目标产物对1,1-二苯基-2-苦基-肼(DPPH)自由基的清除效率平均达91.13%,略高于茶多酚;对金属离子Fe2 的络合能力达358mg/g;抑制脂质过氧化能力强于马尾松树皮提取物.研究表明余甘子树皮提取物可望进一步开发成为新型天然抗氧化及自由基清除剂.

Primary Study on Antioxidative and Radical Scavenging Activities of Extracts from Phyllanthus emblica L. Bark

The major component of extracts from Phyllanthus emblica L.bark is composed of partially galloylated polymeric prodelphinidins and procyanidins which indicate strong antioxidative character from their chemical structure.Experimental data showed that the target product,prepared by ultrasonic extraction and purification,could scavenge radical(e.g.DPPH,scavenging rate 91.13 %,higher than which of tea polyphenol(TP)),complex metal ions(e.g.Fe2 ,358 mg/g)and inhibit lipid peroxidation.This primary study results indicated that the extracts would be hopefully developed as a new sort of natural antioxidant and radical scavenging agent.