酒花原花青素抗氧化性能研究

Study on the anti-oxidative capability of proanthocyanidins from hops

将酒花中原花青素提纯并进行聚合度分级，获得不同平均聚合度（DP）的七种原花青素。对七种原花青素聚合物在水相和油相中的抗氧化性能进行研究。与（＋）-儿茶素和抗坏血酸相比较，DP为1．5～4．0的原花青素还原能力较（＋）-儿茶素和抗坏血酸强，而DP为5．55的原花青素还原能力最弱。不同聚合度的酒花原花青素对脂质体的氧化过程的抑制作用具有一定的浓度效应，在高浓度时，DP为2．97和3．50的原花青素在人工脂质体体系中的抗氧化效果较好。同时，研究发现低聚合度的原花青素在亚油酸体系中具有较好的抗氧化作用。

The proanthocyanidins from hops were separated and purified,and seven proanthocyanidins with different degree of polymerization were obtained by classification of average degree of polymerization. The anti-oxidative capabilities of these polymers were measured in water phase and oil phase. Comparing with （＋）- catechin and Vitamin C（Vc）,the proanthocyanidins of DP 1.5-4.0 showed better reducing capacity,and proanthocyanidins of DP 5.55 had the weakest reducing capacity. Meanwhile,proanthocyanidins of any DP from hops could inhibit the peroxidation of lipid,and proanthocyanidins of DP 2.97 and 3.5 had better inhibition effects at higher concentration. Moreover,it had found that the proanthoocyanidins of lower mDP had better anti-oxidative capability in the Linoleic acid system.