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林产化学与工业 ›› 2018, Vol. 38 ›› Issue (5): 37-44.doi: 10.3969/j.issn.0253-2417.2018.05.006

• 研究报告 • 上一篇    下一篇

巨尾桉树皮总多酚的提取分离及其生物活性研究

姜萍1, 张茜1, 赵雅洁1, 陆婷婷1, 王飞1, 张力平2   

  1. 1. 南京林业大学 化学工程学院;江苏省生物质绿色燃料与化学品重点实验室;江苏省高校农林生物质资源化学利用国家重点实验室培育建设点, 江苏 南京 210037;
    2. 北京林业大学 材料科学与技术学院, 北京 100083
  • 收稿日期:2018-05-18 出版日期:2018-10-25 发布日期:2018-11-06
  • 作者简介:姜萍(1969-),女,黑龙江伊春人,副教授,硕士生导师,主要从事天然产物化学与应用研究;E-mail:pingj_chem@njfu.edu.cn。
  • 基金资助:
    国家重点研发计划项目(2016YFD0600801,2017YFD0601306);江苏高校品牌专业建设工程资助项目(无编号)

Extraction Technology for Total Polyphenols from Eucalyptus grandis×E. urograndis Bark and Their Bioactivities

JIANG Ping1, ZHANG Qian1, ZHAO Yajie1, LU Tingting1, WANG Fei1, ZHANG Liping2   

  1. 1. College of Chemical Engineering, Nanjing Forestry University;Jiangsu Key Lab. of Biomass-based Green Fuels and Chemicals;Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest Biomass, Nanjing 210037, China;
    2. College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China
  • Received:2018-05-18 Online:2018-10-25 Published:2018-11-06

摘要: 以巨尾桉树皮为原料提取按树皮中的总多酚,通过正交试验优化了酶处理与超声波辅助联合提取法及超声波辅助提取法的工艺条件,并对抗氧化活性较强的乙酸乙酯萃取物进一步分离,通过大孔吸附树脂分离纯化制备得到11个活性组分(Fr.1~Fr.11)及1个活性单体化合物(Pu1),同时对其进行了体外抗氧化活性实验,并对Pu1进行了结构表征。研究结果表明:超声波辅助提取法的最佳工艺条件为60%乙醇、提取温度60℃、超声波作用时间50min、料液比为1:12(g:mL),总多酚得率为5.12%。酶处理与超声波辅助联合提取法中最佳酶处理工艺条件为:酶溶液质量浓度0.15g/L、酶解温度50℃、酶解时间50min、酶溶液pH值5.0,在此基础上再经超声波辅助提取,总多酚得率为6.23%。乙酸乙酯萃取物的分离活性组分中Fr.5、Fr.6、Fr.7和Fr.8在质量浓度为24mg/L时对DPPH·清除率大于60%,具有较好抗氧化能力,Pu1的半数抑制质量浓度(IC50)值为8.99mg/L,小于对照样Vc的IC50值(10.46mg/L),说明Pu1具有显著的体外抗氧化活性。活性组分的总多酚含量与其抗氧化活性有很好的相关性(R=0.944 8,P<0.000 1)。通过UV、FT-IR、MS和NMR等分析表明:化合物Pu1的相对分子质量为498,分子C21H22O14,确定化合物Pu1为2'-甲氧基-六羟基联苯二酸-4-O-α-L-鼠李糖苷。

关键词: 巨尾桉树皮, 总多酚化合物, 酶处理, 抗氧化活性

Abstract: The optimum extraction conditions of total polyphenols from Eucalyptus grandis×E. urograndis bark via enzymolysis treatment and ultrasonic-assisted coupling extraction method and ultrasonic extraction method were investigated by using orthogonal experiment. Vitro antioxidant activities of different solvent extracts by ultrasonic extracts were studied and the ethyl acetate extract exhibited stronger antioxidant activity. Then, 11 kinds of fractions(Fr.1-Fr.11) and a purified compound (Pu1) were separated from the ethyl acetate extract by AB-8 macroporous resin. The optimum crafts for ultrasonic extraction method were 60% ethanol, ultrasonic time 50 min, ratio of material-liquid 1:12 (g:mL), ultrasonic temperature 60℃, and the yield of total polyphenols was 5.12%. The optimum crafts for enzymolysis treatment and ultrasonic-assisted coupling extraction method were 0.15 g/L enzyme concentration,enzymolysis temperature 50℃,enzymolysis time 50 min,enzyme solution pH 5.0, combining with ultrasonic extraction, the yield of total polyphenols was 6.23%. The results of radical scavenging capacity assay showed that the scavenging rates of Fr.5, Fr.6, Fr.7 and Fr.8 active fractions at 50 mg/L were greater than 60%, and they had high antioxidant activity. The IC50 of the active compound Pu1 was 8.99 mg/L, less than that of Vc(10.46 mg/L), indicating significant antioxidant activities. Moreover, the phenolic content of the active fractions showed positive correlation with their antioxidant activities (R=0.944 8,P<0.000 1). The structure of compound Pu1 was characterized by UV, FT-IR, MS and NMR and the results showed that its molecular formula and molar mass were C21H22O14 and 498, respectively, which was named as 2'-methoxy-hexadylic biphenylate-4-O-α-L-rhamnoside.

Key words: Eucalyptus grandis×E. urograndis, total polyphenolics, enzymolysis treatment, antioxidant activity

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