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| 大豆油基甘油二酯凝胶油的制备与表征研究 |
| Preparation and characterization of soybean oil based diacylglycerol oleogels |
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| DOI： |
| 中文关键词: 凝胶油 甘油二酯 大豆油 硬脂酸 |
| 英文关键词:oleogel diacylglycerol soybean oil stearic acid |
| 基金项目: |
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| 中文摘要: |
| 以酶法酯化所制的甘油二酯作为凝胶因子，制备大豆油基甘油二酯凝胶油。利用差示扫描量热仪、脉冲核磁共振仪和旋转流变仪等对甘油二酯凝胶油的熔化、结晶特性和流变特性进行评价，并考察了甘油二酯的添加量对凝胶油性质的影响。结果表明：高熔点甘油二酯加入到大豆油中可以形成涂抹性好、稳定性高且晶体结构致密的有机凝胶油，其中凝胶油不饱和脂肪酸含量大于700%，晶体形态以稳定的β和β′型为主；此外，甘油二酯的添加量对凝胶油的机械稳定性、持油性、黏弹性有较大影响，这些性质参数随甘油二酯添加量的增加而增大，但同时体系饱和脂肪酸含量也提高。综合饱和脂肪酸含量，固体脂肪含量，熔化、结晶特性以及流变特性等因素，凝胶油适宜的高熔点甘油二酯的添加量为20%。 |
| 英文摘要: |
| Diacylglycerol was obtained by enzymatic esterification，and the oleogels were prepared from soybean oil and diacylglycerol. The melting，crystallization and rheology behaviors of diacylglycerol oleogels were evaluated by differential scanning calorimetry，pulsed nuclear magnetic resonance and rotational rheometer. The effects of diacylglycerol dosage on the properties of oleogels were investigated. The results showed that diacylglycerol with higher melting point added to soybean oil could form oleogels with good spreadability，high stability and dense crystal structure. The unsaturated fatty acid content of the oleogels was more than 70.0%，and the oleogels mostly consisted of β and β′ crystals. The diacylglycerol dosage had great effects on the mechanical stability，oil binding capacity and viscoelasticity of oleogels. Those properties parameters increased with the diacylglycerol dosage increasing，in the same time，the saturated fatty acid content also increased. According to the saturated fatty acid content，solid fat content，melting and crystallization characteristics and rheological characteristics，the optimal dosage of diacylglycerol with higher melting point was 20%. |
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