Objective: To establish a two reference substances for determination of multiple components (TRSDMC) method for the simultaneous determination of scutellarin, rosmarinic acid, negletein, carvacrol and thymol in Moslae Herba, which was more economical and effective for the quality control of Moslae Herba. Methods: The retention times of the five components in Moslae Herba were determined using HPLC on 13 different C18 columns. The average retention time of each component under each column was then used as the standard retention time for that component. Rosmarinic acid (peak 2) and carvacrol (peak 4) were chosen as linear calibration standards. The chromatographic peaks were localized by using liner calibration with two reference substances (LCTRS). Rosmarinic acid was used as the control substance to determine the content of each component using a relative correction factor. And the results were compared with those obtained from the external standard method. Chemometric analysis was used to excavate the differential quality markers of Moslae Herba. Results: LCTRS had accurate prediction results for the measured components and enjoyed a wide range of column applications. The correction factors of scutellarin, negletein, carvacrol and thymol to rosmarinic acid were 0.853 3, 0.475 2, 3.034 7 and 2.738 6, respectively, and their relative standard deviations were below 2.0%. There was no significant difference between contents obtained by the two methods. The contents of scutellarin, rosmarinic acid, negletein, carvacrol and thymol in 21 batches of Moslae Herba were 0.05-2.87 mg · g-1, 0.73-9.73 mg · g-1, 0.04-0.99 mg · g-1, 0.36-8.52 mg · g-1 and 0.61-10.2 7 mg · g-1, respectively. The 24 batches of samples could be clustered into three categories, and thymol, carvacrol and negletein ether could be used as differential quality markers. Conclusion: TSDMC method for the simultaneous determination of the contents of 5 components in Moslae Herba is stable and reliable, and provides a new idea for the overall quality control of Moslae Herba.
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