凝胶渗透色谱研究大豆油的高温氧化  

Study on high temperature oxidation of soybean oil by gel permeation chromatography

作　　者：杜治波 黄培林[1] 章凯[1] 王德海[1] 

机构地区：[1]浙江工业大学材料科学与工程学院,杭州310014

出　　处：《中国油脂》2015年第8期27-31,共5页China Oils and Fats

摘　　要：为了研究不同受热历史(不同加热时间和不同加热温度)对大豆油体系相对分子质量及其分布变化的影响,采用全油进样的方式进行凝胶渗透色谱(GPC)测试并对结果分峰拟合。结果表明:大豆油加热过程中逐步出现以甘油三酯二聚体、甘油三酯三聚体等为中心相对分子质量的聚合物;延长加热时间与提高加热温度均会促进油脂的聚合,表现为270℃聚合程度最高,其后依次是240、210、180℃。大豆油氧化的动力学研究显示出零级反应适用于描述高温聚合,但温度继续升高,氧化反应趋向于一级反应。The effect of different thermal histories （different heating time and heating temperatures） on the changes of relative molecular weight and its distribution of soybean oil was measured by gel perme- ation chromatography（GPC） with the oil injection mode, and the analysis results were fitted. The results indicated that the novel substances gradually appeared in the heating process, which took the center rela- tive molecular weights of triglycerides dimer, triglycerides trimer, etc. Extending the heating time or im- proving the heating temperature could promote the polymerization of oil, showing that the degree of poly- merization at 270℃ got the highest, followed by 240,210, 180℃. The study result of oxidation kinetics of soybean oil indicated that zero order reaction was suitable for describing the polymerization at high tem- perature, while the oxidation reaction tended to first order reaction when temperature went higher.

关 键 词：大豆油 聚合 受热历史 GPC 

分 类 号：O657.7[理学—分析化学] TS225.13[理学—化学]