Fig. 2
The strategy for the double standard of CMs’ quality control. This flow chart represents the key steps of CMs’ quality control with double standards. Both qualitative and quantitative research include sample preparation, sample loading, detection, data processing and other processes. The difference lies in qualitative research, which mainly determines the composition of substances, that is, the content contained in a certain CM. For CMs’ chemical composition, quantitative research aims to find the most representative compound in large-scale research