Thrasher J J
J Assoc Off Anal Chem. 1979 May;62(3):595-6.
The official method for extracting light filth from ground nutmeg, 44.116, gives variable recoveries of filth elements and results in large amounts of interfering plant material in the light filth extraction. A new method has been developed using a chloroform pretreatment for heavy filth followed by a water-40% isopropanol-mineral oil flotation of light filth. A comparison of the methods in the collaborative study showed a higher recovery of insect fragments, 90.6 vs. 65.2%, and of rodent hairs, 86.5 vs. 66.5%, for the new method over the present official first action method, 44.116. Frothing, an additional problem with the official method, has been reduced by the new method. The new method has been adopted as official first action to replace the existing method.
从肉豆蔻粉中提取轻质杂质的官方方法44.116，对杂质成分的回收率不稳定，并且在轻质杂质提取过程中会产生大量干扰性植物物质。已开发出一种新方法，先用氯仿预处理重质杂质，然后用水 - 40%异丙醇 - 矿物油浮选轻质杂质。协作研究中对这两种方法的比较表明，新方法在昆虫碎片回收率方面比现行官方首次采用的方法44.116更高，分别为90.6%对65.2%，在啮齿动物毛发回收率方面也更高，分别为86.5%对66.5%。官方方法存在的另一个问题——起沫现象，也被新方法减少了。新方法已被采用为官方首次采用的方法以取代现有方法。
