Uncertainty Evaluation and Z-Value Analysis for Determination of the Content of Stilbene Glucoside in Proficiency Testing Samples of Polygonum multiflorum by HPLC

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  • Jingmen Food and Drug Quality Inspection Institute, Hubei Jingmen 448000, China

Received date: 2025-04-14

  Revised date: 2025-08-15

  Accepted date: 2026-04-01

  Online published: 2026-04-01

Abstract

Objective: To evaluate the measurement uncertainty of high-performance liquid chromatography(HPLC) in determining stilbene glucoside content in Polygonum multiflorum and assess the proficiency testing outcomes. Methods: Following the chromatographic analytical method for stilbene glucoside quantification documented in Volume Ⅰ of the Chinese Pharmacopoeia (2020 edition), this study established a mathematical model for the analytical process. Potential influencing factors throughout the testing procedure were comprehensively analyzed through systematic quantification, ultimately enabling calculation of both combined relative standard uncertainty and expanded uncertainty parameters. Results: At the 95% confidence level, the synthetic standard uncertainty of HPLC method for determining the content of stilbene glucoside in Polygonum multiflorum is 0.1%, the expanded uncertainty is 0.2%, and the validation result is expressed as (2.9±0.2)%; k=2, 0≤|Z|≤0.54. Conclusion: The main sources of uncertainty in this method are the purity, weighting and solution preparation of the reference substance of stilbene glucoside, as well as the weighing and pretreatment of the test sample. By evaluating uncertainty, it is possible to identify and prevent risk links in testing, providing reference for improving the accuracy of testing results.

Cite this article

LI Xu, HE Xiaoyu, ZHAO Pinghua, SHANG Xiaoyan . Uncertainty Evaluation and Z-Value Analysis for Determination of the Content of Stilbene Glucoside in Proficiency Testing Samples of Polygonum multiflorum by HPLC[J]. CHINESE JOURNAL OF DRUG EVALUATION, 2026 , 43(1) : 18 -18-23 . DOI: magtech-2025-04-14-00003

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