不同相对分子质量κ-卡拉胶马来酰衍生物的抗氧化活性

Antioxidant Activity of Maleoyl κ-Carrageenans with Different Molecular Weight

对κ-卡拉胶进行酸降解,经过透析得到两种卡拉胶低聚糖。分别与马来酸酐合成得到两种马来酰衍生物(MA和MB),其相对分子质量分别为3 200和4 540,且取代度相近。对产物进行FT-IR表征,并考察了其对羟基自由基.OH、DPPH自由基的清除活性以及还原能力。结果表明:MA清除羟基自由基.OH、DPPH自由基能力以及还原能力均优于MB,即相对分子质量可能是影响卡拉胶衍生物抗氧化活性的因素之一。

Two κ-carrageenan oligosaccharides were prepared by acidic degradation.Then the maleyol derivatives(MA、MB) with similar degree of substitution(0.44) were synthesized with maleyol anhydride,respectively.The products were characterized by FI-IR.Their antioxidant activities were evaluated by the scavenging of hydroxyl radical,1,1-diphenyl-2-picrylhrazyl radicals(DPPH) and reducing power.The results indicated that MA showed higher antioxidant activities than that of MB,the reason may be related to the molecular weight.