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从发酵液中提取生物防腐剂ε-聚赖氨酸的初步研究
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摘要
ε-聚赖氨酸(ε-Poly-L-Lysine)是由微生物发酵合成的一种由赖氨酸单体通过ε-酰胺键形成的多肽。ε-PL具有优良的抑菌作用,对革兰氏阳性菌和阴性菌、酵母和一些病毒都有抑制作用,而且兼有水溶性好、热稳定性高等特点。目前,ε-PL已广泛用于食品加工和贮藏的防腐保鲜、可降解生物材料、药物包被物、靶向药物载体以及医学研究中。
     本文采用D152弱酸性阳离子交换树脂(H型)对发酵法生产的ε-聚赖氨酸进行了分离提取的研究。参考外文文献设计了合理的工艺流程。离心分离发酵液(pH3.2),调节滤液的pH值到8.5,过滤除去沉淀。滤液通过D152离子交换柱(H型),用水和0.2N的醋酸洗涤,用0.1N的盐酸洗脱。用1N的NaON调节洗脱液的pH值到6.5,加入活性炭脱色后浓缩到小体积。加入乙醇和乙醚的混合物(体积比2.1)后,析出白色晶体。产品可进一步使用葡聚糖凝胶柱精制。
     通过静态交换实验,研究了.D152树脂对ε-聚赖氨酸的静态交换的一些参数,通过动态交换实验,研究了以盐酸为洗脱剂,以盐酸为再生剂的工艺流程,确定了主要工艺参数。
ε -Poly-L-Lysine is comprised of lysine linked by amide bond through microbial fermentation. It has excellent antibacterial activity against Gram-positive and Gram-negative bacteria, yeast and some kinds of viruses. In additional ε -Poly-L-Lysine is soluble and attractive heat stable. At present ε -Poly-L-Lysine have been used as natural food preservative mainly, degradable biological matreria, coat of drug, carrier of garget drug and medical research.
    The separation and extraction of ε -Poly-L-Lysine from fermentation liquid by using weak acid anion-exchange resin D152 was studied. The culture broth(pH3.2) was filtered and the filtrate was adjusted to Ph8.5. Then, the precipitate formed was removed by filtration. The filtrate was applied on a column of Amberlite IRC-50(H+-from) and washed with 0.2N acetic acid and water, successively. The substance was eluted with 0.1N hydrochloric acid. The eluate was neutralized with 1N sodium hydroxide and decolorized with active charcoal, and then evaporated to a small volume. The D.P. substance was precipitated as a white powder by addition of an ethanol and ether (2:1)mixture. The substance was further purified by column chromatography on SephadexG-25.
    Through static exchange experiments, static exchange parameters of ε -Poly-L-Lysine on D152 resin is discussed. Through dynamic exchange experiment, the technical process using Hcl as eluent and Hcl as regenerative agent is studied, and main technical parameters are determined.
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