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<p>The quantitative determination of tannins in the composition of plant raw materials is one of the urgent problems of pharmaceutical analysis. In this regard, the determination of tannins in oak bark, pomegranate peel, grape seeds, and their dry extracts was comparatively analyzed. The tannin content was determined by two methods: potentiometric titration and spectrophotometry. It has been established that the spectrophotometric method based on measuring the optical density of an alcohol-water extract at a wavelength of 275 ± 2 nm is more accurate than potentiometric titration. It was revealed that the content of tannins in the bark of oak growing in different regions of Uzbekistan varies from 8.9 to 11.2%.</p>

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Determination of Tannins in Oak Bark, Pomegranate Peel, Grape Seeds, and their Dry Extracts

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • D. K. Mutalova,
  • T. A. Khadjibaev,
  • R. M. Khalilov,
  • M. A. Mamatkhanova,
  • A. Z. Sadikov

摘要

The quantitative determination of tannins in the composition of plant raw materials is one of the urgent problems of pharmaceutical analysis. In this regard, the determination of tannins in oak bark, pomegranate peel, grape seeds, and their dry extracts was comparatively analyzed. The tannin content was determined by two methods: potentiometric titration and spectrophotometry. It has been established that the spectrophotometric method based on measuring the optical density of an alcohol-water extract at a wavelength of 275 ± 2 nm is more accurate than potentiometric titration. It was revealed that the content of tannins in the bark of oak growing in different regions of Uzbekistan varies from 8.9 to 11.2%.