Structural and functional specificity of lignin from camellia oleifera shell obtained by lactic acid-based deep eutectic solvent (DES)
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School of Chemistry and Chemical Engineering, Qiannan Normal College for Nationalities

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    Abstract:

    Lignin was isolated from Camellia oleifera shell by lactic acid-based deep eutectic solvent (DES). The structure, thermal stability and antioxidant activity of lignin samples were investigated. The results showed that TEBAC/LA and Bet/LA DES exhibited excellent capability of solubilizing lignin from biomass. The yield of lignin was 77.87% and 59.49% after pretreatment at 120 ℃ for 5 h, respectively. UV and FTIR analyses show that the benzene ring structure of lignin remains complete and with syringl and guaiacyl units. Compared to TEBAC/LA, the lignin samples extracted by Bet/LA presented low relative molecular mass, low polydispersity index and homogeneous structure. The weight loss rate, weight loss temperature and pyrolysis product of the two lignin are different, indicating that there are significant differences in the thermal stability of different lignin. Moreover, the two lignin samples showed distinct antioxidant activity. The capability of Bet/LA sample to scavenge DPPH radical were up to 84.57%.

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History
  • Received:April 19,2022
  • Revised:July 11,2022
  • Adopted:July 12,2022
  • Online: October 25,2022
  • Published: