Study on the quality grading standard of Andrographis paniculata seeds.

[Objective] To set up a quality grading standard of Andrographis paniculata seeds. [Method] Seeds samples from different producing areas were tested on respects of quality, such as purity, 1 000-grain weight, moisture content and germination rate, etc. The statistical software SPSS was used to perform the K-means clustering on experimental data. [Result] A three grade quality standard of Andrographis paniculata seeds was preliminarily set up mainly based on germination rate combining moisture content, 1 000-grain weight and purity. [Conclusion] The established grading standard was of practical value that could be used as quality control standards for Andrographis paniculata seeds.