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为阐明中药材道地性的客观规律，建立相应的评估指标系统，本文选择常用中药材－山药样品，应用Ｘ射线粉末衍射分析法进行全谱分析，获得可用于标识药材衍射图形的几何拓扑规律与全谱特征标记峰，由此观察到：２个不同产地山药样品的相似性及与伪品的区别。本文结果预示着这一方法在揭示中药材道地性客观规律方面具有广阔的应用前景
In order to elucidate the objective law of the authenticity of Chinese herbal medicines and establish a corresponding evaluation index system, this paper selects the commonly used Chinese herbal medicines - yam samples, and analyzes the topography by X-ray powder diffraction to obtain the geometric topological laws that can be used to identify the diffraction patterns of medicinal materials And full-spectrum signature peaks, it was observed: the similarity of 2 yam samples from different areas and the difference with counterfeit products. The results of this paper indicates that this method has broad application prospects in revealing the objective laws of the authenticity of Chinese herbal medicines