顺式-异油酸，506-17-2，≥97%(GC), oil，

GC测椒目仁油中α-亚麻酸

of measurement ofα-linolenic acid in the Zanthoxylum bungeanum Maxim seeds oil Methods To used by gas chromatography after the samples have been esterified． Results The average contents are 70.47%,the RSD of precision is 2.76％,the average rate of recovery is 98

有毒猪油中有机锡的GC－MS测定

摘要：用固相微萃取法富集猪油中挥发性杂质，经色谱分离，质谱测定，确定了杂质的成分，发现有毒猪油中存在6种与有机锡化合物有关的杂质，它们是合成有机锡的原料和副产物，依据这些杂质推断其合成路线，最终确定有机锡化合物为二硫代醋酸异辛酯二丁基锡。该法准确，简便。 关键词　有机锡，猪油，固相微萃取法，气相色谱－质谱法，二硫代醋酸异辛酯二丁基锡 Identification of Organic Tin Compounds in Contaminated Lard by SPME－GC－

Taq酶PCR实验方法介绍

centrifuge to collect all drops from walls of tube. Overlay the sample with half volume of mineral oil or add an appropriate amount of wax. This step may be omitted if the thermal cycler is equipped with a heated lid. Place samples in a thermocycler