Analysis of Fatty Acid in Rice Bran Oil by Gas Chromatography

Gas Chromatography에 의(依)한 미강유(米糠油)의 지방산분석(脂肪酸分析)

Through an experiment with gas chromatography carried out using diethylene glycol succinate(DEGS) as the packing material of the column, we have obtained the correction factor between the weight ratio and the peak dimension of the saturated fatty acid methyl esters of C10, C12, C14, C16, and C18 and unsaturated fatty acid methyl esters of oleic acid, linoloic acid, and linolenic acid, employing the detector of thermal conductivity type. Quantitative analysis of the fatty acids contained in rice Bran oil was performed with the above correction factor and the results are as follows; 1. Main components were found to be palmitic acid, oleic acid sand linolenic acid. No trases of capric acid (C10) lauric acid (C10) were found. 2. It was confirmed that there were straight line relation between the logarism retention time of each fatty acid and the number of carbon of saturated fatty acid or the number of double bond of other fatty acids having the same number of carbon. 3. The correction factor became larger as to the number of carbon increased up to C18 in case of saturated fatty acids, end as for other fatty acids, and as for other fatty acids of the same carbon number, it became larger according as the number of double bond increased.

1. 미강유중(米糠油中)의 함존지방산(含存脂肪酸)은 Oleic acid, Linoleic acid, Palmitic acid의 순(順)으로 함량(含量)이 많으며 이상(以上) 3종(種) 지방산(脂肪酸)이 주성분(主成分)을 이루고 있다. Stearic acid, myristic acid와 Linolenic acid는 극소량(極少量) 함유(含有)되어 있을 뿐이며 $C_{12}$ 이상(以上)의 산(酸)은 그 흔적(痕迹)이 보이지 않았다. 2. 표준(標準) 지방산(脂肪酸) Methyl로서 구(求)한 보정계수(補正係數)는 포화지방산(飽和脂肪酸)에 있어서 $C_{18}$까지는 탄소수(炭素數)가 증가(增加)함에 따라 커지고 또 동일탄소수(同一炭素數)의 지방산(脂肪酸)에 있어서는 이중결합(二重結合)의 수(數)에 따라 커지고 있다. 3. 지방산(脂肪酸) Methyl Ester의 Retention time의 대수치(對數値)는 포화산(飽和酸)의 탄소수(炭素數), 또는 같은 탄소수(炭素數)의 지방산(脂肪酸)에 있어서 그 이중결합(二重結合)의 수(數)와의 사이에 직선관계(直線關係)가 있다는 것을 확인(確認)했다.