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<p>Lignin, an abundant biopolymer in lignocellulosic biomass, possesses intrinsic antioxidant properties. In this study, lignin was isolated from black liquor, a by-product of second-generation bioethanol production, via acid precipitation and irradiated with gamma rays at 25, 50, and 75&#xa0;kGy, using the dose rate of 3&#xa0;kGy per hour. Structural and functional changes were examined, including free radical content, functional groups, degradation products, thermal stability, and antioxidant activity. Gamma irradiation induced partial depolymerization, increased radical species and oxygenated groups, and reduced thermal stability. The 2,2-diphenyl-1-picrylhydrazyl (DPPH) assays revealed dose-dependent IC<sub>50</sub> values, with the highest antioxidant enhancement at 75&#xa0;kGy, classified as moderate by the antioxidant activity index.</p>

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Gamma irradiation-enhanced antioxidant properties of soda lignin isolated from bioethanol-derived black liquor

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Oktaviani Oktaviani,
  • Priscilla Inez Gerard,
  • Ade Lestari Yunus,
  • Akhmad Rasyid Syahputra,
  • Nunung Nuryanthi,
  • Eddy Heraldy,
  • Atanu Kumar Das,
  • Roni Maryana

摘要

Lignin, an abundant biopolymer in lignocellulosic biomass, possesses intrinsic antioxidant properties. In this study, lignin was isolated from black liquor, a by-product of second-generation bioethanol production, via acid precipitation and irradiated with gamma rays at 25, 50, and 75 kGy, using the dose rate of 3 kGy per hour. Structural and functional changes were examined, including free radical content, functional groups, degradation products, thermal stability, and antioxidant activity. Gamma irradiation induced partial depolymerization, increased radical species and oxygenated groups, and reduced thermal stability. The 2,2-diphenyl-1-picrylhydrazyl (DPPH) assays revealed dose-dependent IC50 values, with the highest antioxidant enhancement at 75 kGy, classified as moderate by the antioxidant activity index.