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林产化学与工业 ›› 2007, Vol. 27 ›› Issue (3): 27-32.

• 研究报告 • 上一篇    下一篇

羧甲基落叶松单宁的合成及抑菌性能研究

黄占华, 方桂珍, 张斌   

  1. 东北林业大学 生物质材料科学与技术教育部重点实验室, 黑龙江 哈尔滨 150040
  • 收稿日期:2006-03-24 修回日期:1900-01-01 出版日期:2007-06-30 发布日期:2007-06-30
  • 通讯作者: 方桂珍,教授,博士生导师,主要从事木材化学方面的研究和教学工作;E-mail:fanggz@public.hr.hl.cn

Studies on Synthesis and Antibacterial Performance of Carboxymethylated Larch Tannin

HUANG Zhan-hua, FANG Gui-zhen, ZHANG Bin   

  1. Key Laboratory of Bio-based Material Science and Technology, Northeast Forestry University, Ministry of Education, Harbin 150040, China
  • Received:2006-03-24 Revised:1900-01-01 Online:2007-06-30 Published:2007-06-30

摘要: 探讨了落叶松单宁羧甲基化的合成条件,对其主要影响因素如反应温度、分散时间、碱化剂质量浓度等进行了深入的分析,确定了最佳合成反应条件为:氯乙酸与单宁中羟基的物质的量之比值为1.8,分散时间2h,碱化温度60℃,碱化剂与单宁中羟基的物质的量之比值为1.4,碱化剂质量浓度0.2g/mL,碱化时间30min,醚化反应温度78℃,醚化反应时间4h.元素分析结果表明,羧甲基化后单宁中碳、氢含量降低,氧含量明显升高;红外谱图中的特征官能团进一步证实单宁发生了羧甲基化反应.抑菌实验结果表明,羧甲基落叶松单宁(CLT)对蜡状芽孢杆菌、大肠杆菌和金黄色葡萄球菌均有明显的抑制作用,其对蜡状芽孢杆菌的最低抑菌浓度(MIC)值为62.5mg/L,最低杀菌浓度(MBC)值为125mg/L,是大肠杆菌和金黄色葡萄球菌MIC和MBC的1/4~1/2,均比同样条件下的落叶松单宁对以上3种细菌的抑菌率高.

关键词: 落叶松单宁, 羧甲基化, 抑菌

Abstract: Conditions for synthesis of carboxymethyl larch tannin (CLT) such as reaction temperature, dispersion time and concentration of alkaline reagent were investigated. The optimum synthesis conditions were as follows: molar ratio of chloroacetic acid to hydroxyls of tannin 1.8, dispersion time 2 h, alkalization temperature 60℃, ratio of alkaline reagent to hydroxyls in tannin 1.4, concentration of alkaline reagent 0.2 g/mL, alkalization time 30 min, temperature 78℃, etherification time 4 h. FT-IR and elemental analysis (EA) were applied to analyse structural changes of larch tannin. EA showed that after carboxymethylation contents of C and H decreased, while an obvious increase of O content was observed. Characteristic functional groups observed in FT-IR spectra approved the carboxymethylation of tannin. Antibacterial experiment indicated that carboxy-methylated larch tannin showed obvious inhibition effects against Bacillus cereus, Escherichia coli and Staphylococcus aureus, with MIC of 62.5 mg/L and MBC of 125 mg/L against B. cereus respectively, which are 1/4-1/2 of those against E. coli and S. aureus respectively, showing higher antibacterial rates than those of larch tannin.

Key words: larch tannin, carboxymethylation, bacteriostasis

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