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<p>The major challenge regarding Persian gum (PG) is its tannin content which acts as an anti-nutritional compound by binding to proteins and ions. The purpose of present study was tannin removal from PG using electromagnetic waves. In this regard, PG was exposed to mercury ultraviolet (UV) lamp, continuous and pulsed UV LED, visible light emitting florescent lamps (neutral white and warm white). Moreover, color indexes, zeta potential, structural changes, rheological behavior, and solubility of gum were evaluated. According to the results, the highest tannin removal efficiency belonged to the samples treated with mercury UV lamp (for 45&#xa0;min), pulsed UV LED (for 2&#xa0;h) and neutral white light fluorescent lamp (for 72&#xa0;h). However, pulsed UV LED resulted in greater tannin removal efficiency compared to the mercury UV lamp at comparable doses. Tannin removal decreased the <i>a</i>* and <i>b</i>* values as well as zeta potential. UV mercury and fluorescent lamps enhanced solubility and soluble fraction content of PG. FTIR illustrated glycosidic bond degradation in PG chain generated additional free–OH groups, increasing hydrogen bonding and apparent viscosity in the samples treated with pulsed UV LED and fluorescent lamps. Consequently, the outcomes of the research confirmed that UV was more effective on tannin reduction in comparison with other electromagnetic waves with higher wavelength which provides a sustainable and non-chemical strategy for tannin removal.</p>

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Effect of electromagnetic waves on tannin removal and physicochemical properties of Persian gum: a comparative study of UV radiation from mercury and pulsed LED lamps

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Nikta Rohani,
  • Fatemeh Azarikia,
  • Saied Moghaddam,
  • Saman Abdanan Mehdizadeh

摘要

The major challenge regarding Persian gum (PG) is its tannin content which acts as an anti-nutritional compound by binding to proteins and ions. The purpose of present study was tannin removal from PG using electromagnetic waves. In this regard, PG was exposed to mercury ultraviolet (UV) lamp, continuous and pulsed UV LED, visible light emitting florescent lamps (neutral white and warm white). Moreover, color indexes, zeta potential, structural changes, rheological behavior, and solubility of gum were evaluated. According to the results, the highest tannin removal efficiency belonged to the samples treated with mercury UV lamp (for 45 min), pulsed UV LED (for 2 h) and neutral white light fluorescent lamp (for 72 h). However, pulsed UV LED resulted in greater tannin removal efficiency compared to the mercury UV lamp at comparable doses. Tannin removal decreased the a* and b* values as well as zeta potential. UV mercury and fluorescent lamps enhanced solubility and soluble fraction content of PG. FTIR illustrated glycosidic bond degradation in PG chain generated additional free–OH groups, increasing hydrogen bonding and apparent viscosity in the samples treated with pulsed UV LED and fluorescent lamps. Consequently, the outcomes of the research confirmed that UV was more effective on tannin reduction in comparison with other electromagnetic waves with higher wavelength which provides a sustainable and non-chemical strategy for tannin removal.