基于DNA条形码技术的人参真伪鉴别PCR方法的建立与验证

Establishment and Validation of a PCR-Based Method for Authenticity Identification of Panax ginseng Using DNA Barcoding Technology

摘要: 人参作为一种重要的中药材，具有极高的药用和经济价值。由于市场需求量大且价格昂贵，导致大量伪品充斥市场，严重影响了其临床疗效和消费者利益。本研究旨在建立一种基于PCR技术的人参真伪鉴别方法。方法：通过对人参、三七、西洋参、姜状三七等人参属植物的18S核糖体RNA (18S rRNA)、内部转录间隔区序列1 (Internal Transcribed Spacer1, ITS1)、5.8S rRNA、ITS2基因DNA序列进行比对，发现特异性位点，并设计了相应的引物。进一步优化了PCR反应体系和条件，并对不同样品DNA进行快速检测，以确保PCR扩增技术的特异性和灵敏度。结果：通过实验验证，引物对-1优化后的PCR反应条件为退火温度为57℃，最佳引物浓度0.4 μmol/L，DNA模板浓度为2 ng。在此条件下，PCR方法能够高效、特异性强地扩增，准确区分人参与常见易混品。结论：本研究建立的特异性PCR方法，能够有效区分人参及其易混品，具有操作简便、快速准确的优点，为人参的质量控制和真伪鉴别提供了可靠的技术手段。

Abstract: Panax ginseng, as a valuable medicinal herb, holds significant medicinal and economic value. Due to its high market demand and expensive price, counterfeit products have flooded the market, severely affecting its clinical efficacy and consumer interests. This study aims to establish a PCR-based method for the authenticity identification of P. ginseng. Methods: By aligning the DNA sequences of 18S rRNA, ITS1, 5.8S rRNA, and ITS2 from P. ginseng, Panax notoginseng, Panax quinquefolius, Panax zingiberensis, and other Panax species, we identified specific loci and designed corresponding primers. The PCR reaction system and conditions were further optimized, and rapid DNA detection was performed on different samples to ensure the specificity and sensitivity of PCR amplification. Results: Experimental validation showed that the optimized PCR conditions for Primer Pair-1 were as follows: annealing temperature at 57˚C, 35 amplification cycles, the optimal primer concentration at 0.4 μmol/L, and a DNA template concentration of 2 ng. Under these conditions, the PCR method was able to efficiently and specifically amplify the target DNA, accurately distinguishing P. ginseng from common adulterants. Conclusion: The specific PCR method established in this study can effectively differentiate P. ginseng from its adulterants, offering the advantages of simplicity, speed, and accuracy, thus providing a reliable technical tool for P. ginseng quality control and authenticity identification.