乳酸类低共熔溶剂分离油茶壳木质素及结构特性分析
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1.黔南民族师范学院化学化工学院;2.黔南环境治理与污染控制工程研究中心

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贵州省教育厅青年科技人才成长项目(黔教合KY[2020]204);贵州省科技计划项目(黔科合基础-ZK[2022]一般545);黔南民族师范学院引进高层次人才研究专项(QNSY2019RC11);贵州省普通高等高校工程研究中心项目(黔教合KY字[2018]487号)


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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    摘要:

    以油茶壳为原料,利用两种乳酸类低共熔溶剂(DES)分离木质素,并对其结构、热解特性和抗氧化活性进行分析和评价。结果表明:三乙基苄卡基氯化铵/乳酸(TEBAC/LA)和甜菜碱/乳酸(Bet/LA)DES均表现出良好的木质素分离能力,在固液比1∶20,120 ℃,5 h的反应条件下,木质素提取率分别为77.87%和59.49%。紫外和红外光谱分析结果表明油茶果壳木质素结构保留完整,主要由紫丁香基和愈创木酚基单元结构组成。与TEBAC/LA相比,Bet/LA分离得到的木质素具有相对分子量低和分布窄的特性。此外,从热解特性方面分析,两种木质素的失重速率、失重温度和热解产物均存在显著差异。同时,两种木质素均表现出良好的抗氧化活性,其中Bet/LA对DPPH清除率最高可达84.57%。

    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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李 锋,毛海立,徐平,曾承露.乳酸类低共熔溶剂分离油茶壳木质素及结构特性分析[J].精细化工,2022,39(12):

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  • 收稿日期:2022-04-19
  • 最后修改日期:2022-07-11
  • 录用日期:2022-07-12
  • 在线发布日期: 2022-10-25
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