熱重量分析による油脂の品質評価 (第2報) : 不飽和トリグリセリドの熱分解挙動

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Pyrolysis characteristics of five kinds of unsaturated triglycerides were investigated by ordinary and derivative thermogravimetry.<BR>1) Weight reduction in tripalmitolein (PoPoPo), triolein (OOO) and trieicosenoin (EiEiEi) was initiated at 194°C and completed at 542°C under a stream of air. The processes involved in this reduction were more complicated than those for that of saturated triglycerides due to oxidative decomposition. On the other hand, reduction under a stream of nitrogen was similar to that of saturated triglycerides.<BR>2) The weights of trilinolein (LLL) and trilinolenin (LiLiLi) increased as the temperature was raised from 100°C to 200°C under the stream of air, and the rate of increase in the weight of (LiLiLi) was higher than that of (LLL). The pyrolysis behavior of (LLL) and (LiLiLi) from 300°C to 400°C was more complicated than that of (OOO).<BR>3) Volatile substances and residues recovered at the initial stage of pyrolysis (at 20% weight reduction) of the four triglycerides were analyzed. The main component of the volatile substances formed by heating under the stream of nitrogen was a fatty acid constituting the unheated triglyceride. Under the stream of air, a number of fatty acids was detected. In the case of heating under the stream of air, the solubility of the residues in ether became less on increasing the degree of unsaturation of triglycerides. Under the stream of nitrogen, the main component of ether-soluble fraction of the residues was the original triglyceride except for the case of (LiLiLi).

熱重量分析による油脂の品質評価 (第2報) : 不飽和トリグリセリドの熱分解挙動

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