涂石蜡大米的石蜡含量测定方法的研究  

Determination of Liquid Paraffin for Paraffin Coated Rice

作　　者：范璐[1] 毕艳兰[2] 蔡凤英[1] 王玉明[1] 宋慧波[1] 

机构地区：[1]河南工业大学化学化工学院,郑州450052 [2]河南工业大学粮油食品学院,郑州450052

出　　处：《中国粮油学报》2006年第4期131-134,145,共5页Journal of the Chinese Cereals and Oils Association

基　　金：国家粮食局编制国家标准"定性定量检测涂油大米的方法研究"(20022077-T-449)

摘　　要：针对7种大米,分别涂液体石蜡0.2%.索氏抽提法从整粒或粉碎大米中抽提粗脂肪,采用测定皂化值（方法Ⅰ）和不皂化物含量法（方法Ⅱ）确定大米表面的石蜡量.结果显示,除黑米外,方法Ⅰ和方法Ⅱ的回收率分别是93.1%～120%（整粒）、95.5%～109%（粉碎）和70.4%～122%（整粒）、70.9%～99.5%（粉碎）.石蜡涂量在0.05%以上,方法Ⅰ是测定涂石蜡大米中石蜡含量的可靠方法.7 kinds of rice were coated with 0.2% paraffin liquid. The coarse fat of coated rice was extracted from the whole grain or the crushed rice with Soxhlet method. Its saponification value （ for method Ⅰ ） and unsaponifiable compound （for method Ⅱ ） were determined to confirm the liquid paraffin content on the surface of the rice grains. The recoveries obtained for method Ⅰ are 93.1% - 120% （using whole grain） and 95.5% - 109% （using crushed rice） ; the recoveries for method Ⅱ are 70.4% - 122% （ using whole grain） and 70.9% - 99.5% （ using crushed rice） except the black rice. The method is feasible for rice coated with paraffin more than 0.05%.

关 键 词：大米 石蜡 皂化值 不皂化物 定量 

分 类 号：TS245.4[轻工技术与工程—制糖工程]