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<p>Lignin is the most underutilized lignocellulosic biomass having crucial properties for valorization into biofuels, chemicals, and biomaterials. <i>Prunus persica</i> is a lignin-rich endocarp biomass and the world’s second-most-harvested temperate horticultural fruit after apples. Its endocarp contains high lignin and unsuitable for animal feed or soil amendment. Lignin isolation is challenging due to recalcitrant nature of lignocellulosic biomass. Recently, deep eutectic solvents (DESs) have emerged as an effective option for lignin isolation. In this study, ultrasound-assisted DES-mediated lignin isolation from <i>Prunus persica</i> endocarp was examined. The effects of molar ratio of DES (1:1–1:5), time (30–150&#xa0;min), temperature (60–140&#xa0;°C), ultrasound power (15–75&#xa0;W), particle size (53–500&#xa0;μm), and solid loading (5–25%) were investigated. Moreover, properties of isolated lignin such as antioxidant activity, UV absorptivity, thermal property, functional groups, and particle size were analyzed to evaluate its suitability for different applications. The maximum lignin yield of 51.5% was obtained at temperature of 140&#xa0;°C, solid loading of 15%, molar ratio of 1:3, time of 90&#xa0;min, and ultrasound power of 45&#xa0;W. The results of thermal analysis indicated that DES-lignin was thermally resistant up to 300&#xa0;°C. The FTIR analysis revealed that DES-lignin mostly contains sinapyl and Guaiacyl units. The particle size analysis showed that the average size of DES-lignin was in the micro range. The UV absorption and antioxidant analysis provided that DES-lignin has high UV blocking properties with a high shield against UV-B and against UV-A and strong antioxidant properties (89.49&#xa0;µg/ml IC50 value), respectively. Indeed, the properties of DES-lignin highlight the potential applications in enhancing mechanical and thermal property polymers, as UV filter, and antioxidant active.</p>

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Ultrasound-assisted deep eutectic solvent (DES) mediated isolation and characterization of lignin from Prunus persica endocarp

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Tsegaye Abera Mekuriaw,
  • Belachew Zegale Tizazu,
  • Adamu Esubalew Kassa,
  • Yalew Woldeamanuel Sitotaw

摘要

Lignin is the most underutilized lignocellulosic biomass having crucial properties for valorization into biofuels, chemicals, and biomaterials. Prunus persica is a lignin-rich endocarp biomass and the world’s second-most-harvested temperate horticultural fruit after apples. Its endocarp contains high lignin and unsuitable for animal feed or soil amendment. Lignin isolation is challenging due to recalcitrant nature of lignocellulosic biomass. Recently, deep eutectic solvents (DESs) have emerged as an effective option for lignin isolation. In this study, ultrasound-assisted DES-mediated lignin isolation from Prunus persica endocarp was examined. The effects of molar ratio of DES (1:1–1:5), time (30–150 min), temperature (60–140 °C), ultrasound power (15–75 W), particle size (53–500 μm), and solid loading (5–25%) were investigated. Moreover, properties of isolated lignin such as antioxidant activity, UV absorptivity, thermal property, functional groups, and particle size were analyzed to evaluate its suitability for different applications. The maximum lignin yield of 51.5% was obtained at temperature of 140 °C, solid loading of 15%, molar ratio of 1:3, time of 90 min, and ultrasound power of 45 W. The results of thermal analysis indicated that DES-lignin was thermally resistant up to 300 °C. The FTIR analysis revealed that DES-lignin mostly contains sinapyl and Guaiacyl units. The particle size analysis showed that the average size of DES-lignin was in the micro range. The UV absorption and antioxidant analysis provided that DES-lignin has high UV blocking properties with a high shield against UV-B and against UV-A and strong antioxidant properties (89.49 µg/ml IC50 value), respectively. Indeed, the properties of DES-lignin highlight the potential applications in enhancing mechanical and thermal property polymers, as UV filter, and antioxidant active.