Zhang Jianxin, Zhang Daming, Qiao Jing, Yang Shiyun
Forensic Medical examination Center of Beijing Public Security Bureau, Beijing 100085, China.
Wei Sheng Yan Jiu. 2008 Nov;37(6):736-9, 744.
To compare and classify the samples of MA crystals by using impurity profile to offer methods for identification of linked samples.
50 mg samples of MA were dissolved in 1 ml of buffer solution (pH 7.0, four parts of 0.1 mol/L phosphate buffer, and one part of 10% Na2CO3), impurities were extracted with 0.5 ml of ethyl acetate containing four internal standards (n-decane, n-pentadecane, n-eicosane and n-octacosane) and analyzed by gas chromatography with a flame ionization detector on a DB-5 capillary column (30 m x 0.32 mm i.d. x 1.0 microm). Seventeen characteristic peaks on chromatograms were selected for the comparison and classification of samples, and the data were evaluated by the Euclidean distance of the relative peak areas after logarithmic transformation.
Eight different batches of MA (six samples from each batch) to be seized by the Beijing Public Security Bureau (BPSB) in 2006-2007 were analyzed. The results indicated that the samples from the same batch were successfully classified into one group.
The methods could be very useful for identifying the linked samples and could provide technique foundation for MA drug criminal inspection.
通过杂质剖析对甲基苯丙胺（MA）晶体样本进行比较和分类，为关联样本的鉴定提供方法。
将50mg的MA样本溶解于1ml缓冲溶液（pH 7.0，由四份0.1mol/L磷酸盐缓冲液和一份10%碳酸钠组成）中，用0.5ml含有四种内标物（正癸烷、正十五烷、正二十烷和正二十八烷）的乙酸乙酯萃取杂质，并在DB - 5毛细管柱（30m×0.32mm内径×1.0μm）上用火焰离子化检测器通过气相色谱法进行分析。选择色谱图上的17个特征峰用于样本的比较和分类，并通过对数转换后相对峰面积的欧几里得距离对数据进行评估。
对北京市公安局（BPSB）在2006 - 2007年查获的八批不同的MA（每批六个样本）进行了分析。结果表明，同一批次的样本成功地被归为一组。
该方法对关联样本的鉴定非常有用，可为MA毒品刑事检验提供技术基础。
