Chinese Journal of Pharmacovigilance ›› 2025, Vol. 22 ›› Issue (10): 1081-1086.
DOI: 10.19803/j.1672-8629.20250455

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Changes and Digital Characterization of Cross-Section Characters of Polygonum Multiflorum Thunb. Grown for Different Years and Harvested at Different Times

YANG Yanrong1,2, SHI Jia2△, WANG Qi2,3,*   

  1. 1School of Functional Food and Wine, Shenyang Pharmaceutical University, Shenyang Liaoning 110016, China;
    2National Institutes for Food and Drug Control, Institute for Control of Chinese Traditional Medicine and Ethnic Medicine, Beijing 100050, China;
    3State key Laboratory of Drug Regulatory Science, Beijing 102629, China
  • Received:2025-07-11 Online:2025-10-15 Published:2025-10-20

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Abstract: Objective To explore the characteristics of Polygonum multiflorum Thunb. grown for 1 to 6 years and harvested in spring and autumn and to study the correlations between years of growth and its properties. Methods The Sapphire dual-mode multispectral laser imaging system was used to scan the sections of Polygonum multiflorum Thunb. pieces harvested in spring and autumn and grown for 1 to 6 years. By measuring the number, surface area, central vascular area and total area of abnormal vascular bundles on the sections of Polygonum multiflorum Thunb., the properties of Polygonum multiflorum Thunb. harvested in spring and autumn and grown 1 to 6 years were analyzed. Results ① The number of abnormal vascular bundles decreased with the years of growth, and the number of samples collected in the spring and grown for 1 to 6 years ranged from 8-16 to 8-15, compared with 9-20 to 9-16 for those collected in autumn. ② The cross-sectional surface area of Polygonum multiflorum Thunb. samples collected in spring and autumn increased with the years of growth, ranging from 3.92-5.26 cm2 to 10.14-15.37 cm2 for those collected in spring and from 4.84-5.37 cm2 to 12.29-17.32 cm2 for those harvested in autumn. ③ The central vascular bundle areas of Polygonum multiflorum Thunb. harvested in spring and autumn increased with the years of growth, with the samples harvested in spring ranging from 0.31-0.49 cm2 to 0.61-0.88 cm2 and from 0.27-0.42 cm2 to 0.58-0.77 cm2 for those collected in autumn.④ The areas of abnormal vascular bundles of Polygonum multiflorum Thunb. harvested in spring and autumn increased with the years of growth, with the samples harvested in spring ranging from 0.45-0.74 cm2 to 0.97-1.62 cm2 and from 0.58-0.77 cm2 to 1.55-2.14 cm2 for those harvested in autumn.⑤ The ratio of the central vascular bundle area to the cross-sectional area of decoction pieces collected in spring and autumn and grown for different years trended downward with the years, and ranged from 0.06-0.11 cm2 to 0.05-0.06 cm2 and from 0.05-0.08 cm2 to 0.04-0.06 cm2 respectively.⑥ The ratio of the total area of abnormal vascular bundles to the cross-sectional surface area of samples collected in spring and autumn and grown for different years became smaller with the years. The ratio decreased significantly in samples grown for 1-3 years, but gradually stabilized in those grown for over 3 years. The ratio ranged from 0.09-0.18 cm2 to 0.07-0.16 cm2 in samples collected in spring and from 0.07 to 0.16 for those collected in autumn. Conclusion The way in which the properties of Polygonum multiflorum Thunb. change in the process of growth has been elucidated, and the properties of Polygonum multiflorum Thunb. pieces are basically stable after three years of growth. Two important characteristics, namely, the cross-sectional surface area and the total area of abnormal vascular bundles, are larger in those collected in autumn and of the same age, so harvesting Polygonum multiflorum Thunb. in autumn is preferable.

Key words: Polygonum multiflorum Thunb., Harvest Season, Cross-Section, Characteristics, Abnormal Vascular Bundle, Digitization

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