金钱白花蛇及其混淆品高特异性PCR的鉴别

目的：建立一种实用、简便的金钱白花蛇药材DNA分子标记鉴别方法。方法：根据金钱白花蛇及常见混淆品线粒体Cyt b基因序列,设计一对专门用于中药材金钱白花蛇的鉴别引物HJL-1和HJH-1。用不同的复性温度PCR扩增,确立特异性反应条件,并利用此方法鉴别从市场中购买的金钱白花蛇药材。结果：在67 ℃复性温度下进行PCR,正品金钱白花蛇均得到230 bp的扩增带,而混淆品在同样的条件下无扩增带。对市售金钱白花蛇药材随机选取18块进行PCR鉴别验证,其中正品14块,混淆品4块,检出率达100％。结论：设计的鉴别引物对正品金钱白花蛇有高度特异性。可用于市售金钱白花蛇药材的鉴定。PCR稳定性高,同种不同个体间的种内差异对鉴定结果不会有影响。

High specific PCR identification of Bungarus multicinctus and its adulterantsFENG Cheng-qiang1,4, TANG

OBJECTIVE: To develop a convenient and effective method for the identification of Bungarus multicinctus. METHOD: Based on the sequence of Cyt b gene fragment of B. multicinctus and its adulterants, a pair of highly specific primer (HJL- and HJH-) were designed for distinguishing B. ulticinctus from other species of snake. To establish specific PCR reaction condition, the primers were employed to amplify the DNA templates extracted from B. multicinctus and 6 other species of snake, under different annealing temperature. Using this method, B. multicinctus was identified from 18 samples bought from many drugstores. RESULT: A 230 bp DNA fragment was amplified from B. multicinctus in PCR with annealed temperature at 67 degrees C, whereas no DNA fragment was amplified from other snake samples under the same reaction condition, B. multicinctus could be clearly distinguished from others by PCR reaction with the highly specific primers. In the present study, 18 sample, bought from different drugstores, were also identified by the highly specific PCR with the primers. The results indicated that 14 samples were B. multicinctus and the other 4 were adulterant, which was consistent with the conclusion of authentication based on morphological. CONCLUSION: The primers designed in the present study were highly specific for B. multicinctus.