基于色度值及质量标志物的薏苡仁传统炮制方法研究
Research on the traditional processing method of Coix seed based on the colorimetry and quality marker
目的 比较不同传统炮制方法对薏苡仁饮片主要化学成分及颜色的影响,探讨不同传统炮制方法的差异性。 方法 采用高效液相色谱法(high-performance liquid chromatography,HPLC)测定不同传统炮制方法炮制出的薏苡仁饮片中9种化学成分的含量;采用色差仪对薏苡仁不同炮制饮片的颜色进行客观表征;运用正交偏最小二乘判别法(orthogonal partial least squares discriminant analysis,OPLS-DA)、主成分分析法(principal component analysis,PCA)、偏最小二乘法(partial least squares,PLS)对主要化学成分的含量与颜色进行相关性分析并根据颜色分类。 结果 与生品比较,糯米炒、姜汁炒和盐炒的薏苡仁部分化学成分含量有所增加。聚类分析(hierarchical cluster analysis,HCA)和PCA、OPLS-DA结果显示,薏苡仁不同传统炮制方法可以各自聚类,表明不同传统炮制方法有各自的特性。a*(红绿色度)、b*(黄蓝色度)以及三亚油酸甘油酯、1,2-亚油酸-3-油酸甘油酯、棕榈酸亚油酸油酸甘油酯、棕榈酸二油酸油酯是区分不同方法的主要因素。成分与色度相关联的OPLS-DA和PLS结果显示,有6个成分与饮片颜色的变化相关。 结论 不同传统炮制方法的薏苡仁化学成分含量与颜色具有一定的相关性,为薏苡仁传统炮制方法炮制饮片的临床应用及质量控制提供依据。
Objective To compare the effects of different traditional processing methods on the main chemical components and color of Coix seed decoction pieces, and to explore the differences among different processing methods. Methods The main chemical components of Coix seed processed by different methods were analyzed by using high-performance liquid chromatography (HPLC). 9 components were identified. A color difference meter was used to objectively characterize the color of decoction pieces prepared by different methods. Orthogonal partial least squares regression (OPLS-DA) and principal component analysis (PCA) were employed to analyze the correlation between the content of main components and color, and to classify the samples based on color. Results Content analysis showed that compared with raw Coix seed, the content of some index components increased, while the content of other components was lower than that of raw products. Hierarchical cluster analysis (HCA), PCA, and OPLS-DA results indicated that different traditional processing methods could be distinctly clustered, highlighting the unique characteristics of each method. The a* (red-green degree), b* (yellow-blue degree), glycerol trioleate, glycerol 1,2-linoleate-3-oleate, oleol palmitate linoleate, and oleol palmitate dioleate were identified as the main factors distinguishing different processing methods. The results of OPLS-DA and partial least squares regression (PLS) showed that 6 components were associated with the color change of decoction pieces. Conclusion There is a certain correlation between the content and color of Coix seed processed by different traditional methods. This study provides a theoretical basis for the application and quality control of decoction pieces prepared by traditional processing methods.
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