| 稻米中脂肪酸值测定方法的研究 |
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| 引用本文： | 徐霞,应兴华,段彬伍. 稻米中脂肪酸值测定方法的研究[J]. 中国粮油学报, 2007, 22(1): 105-107 |
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| 作者姓名： | 徐霞 应兴华 段彬伍 |
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| 作者单位： | 中国水稻研究所农业部稻米及制品质量监督检验测试中心,杭州,310006 |
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| 摘 要： | 建立了稻米中脂肪酸值的滴定新方法。样品以石油醚提取后，过滤，加入50％乙醇溶液，以酚酞为指示剂，用KOH标准溶液滴定至下层溶液呈微红色。该方法回收率为96．66％-100．77％，相对标准偏差为0．29％-3．56％。本方法的选择性和精密度均优于乙醇提取法，滴定终点变化敏锐。
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| 关 键 词： | 稻米 脂肪酸值 游离脂肪酸 |
| 收稿时间： | 2005-12-07 |
| 修稿时间： | 2005-12-07 |
Study on Determination of Fatty Acid Value of Rice |
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| Xu Xia,Ying Xinghua,Duan Binwu. Study on Determination of Fatty Acid Value of Rice[J]. Journal of the Chinese Cereals and Oils Association, 2007, 22(1): 105-107 |
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| Authors: | Xu Xia Ying Xinghua Duan Binwu |
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| Affiliation: | China National Rice Research Institute, Rice Product Quality Supervision and Inspection Center, Ministry of Agriculture, Hangzhou 310006 |
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| Abstract: | An accurate and simple method for determination of fatty acid value of rice was developed.The procedure is as follows: Extract free fatty acids by petroleum ether,and add 50% ethanol solution after filtration,then titrate with standard volumetric potassium hydroxide solution using phenolphthalein as indicator until the end-point indicated by a sharp change of color from neutral to pink.The relative standard deviation of the method is 0.29%~(3.56%),and the recovery ranges from 96.66% to 100.77%.The procedure is more precise and objective than conventional ethanol method,and the endpoint of titration is sharp. |
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| Keywords: | rice fat acidity free fatty acid |
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