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无溶剂体系中脂肪酶催化合成癸酸甘油酯 总被引:2,自引:0,他引:2
王征远 《扬州职业大学学报》2001,5(3):36-40
研究了无溶剂体系中固定化脂肪酶催化癸酸和甘油合成癸酸甘油酯,并与油酸进行对比。癸酸和油酸分别在50℃和60℃下获得最高平衡转化率。在开口反应器中,加酶量100u/g,50℃下癸酸最高平衡转化率为90%,移去水的方不同对最终转化率影响很大。 相似文献
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细胞固定化技术在城市污水的处理中的应用 总被引:4,自引:0,他引:4
本文介绍了固定化的概念、分类、固定化细胞的制备方法、固定细胞的载体及影响因素。同时.介绍了固定化细胞在城市污水处理中的特点及应用。认为细胞固定化技术具有活性高、可反复利用和对高浓度氨氯污水有较强的处理能力,适于处理城市污水。 相似文献
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选择盐泽螺旋藻进行培养,比较其在正常培养液与含亚甲基兰培养液中的生长曲线、叶绿素a含量以及对染料脱色率的不同.将悬浮藻和固定化藻加入到染料废水中,测定处理前后染料废水的吸光度,并计算脱色率.结果表明:固定化盐泽螺旋藻对染料废水的脱色率明显高于悬浮藻,实验数据显示了藻类的固定化提高了它的合成代谢活性. 相似文献
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啤酒传统间歇工艺与固定化酵母连续工艺之比较 总被引:1,自引:0,他引:1
与传统间歇式啤酒发酵工艺相比,固定化酵母连续啤酒发酵工艺的设备投资要低得多,且发酵周期也大为缩短,但发酵的啤酒质量及风味却并不逊色,因此正受到全世界啤酒科研院所及生产厂家的广泛重视。 相似文献
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以苯酚作为唯一碳源和能源的无机盐培养液对从绝缘材料厂排放的活性污泥进行驯化,从中分离筛选到1株苯酚降解菌,编号为JY04.采用正交实验设计方法优化了该菌株固定化条件,并且考察了该固定化细胞降解苯酚的最适条件.结果表明:在固定化条件为海藻酸钠(SA)浓度为5%,湿菌重/包埋剂为6/30,CaCl2浓度为3%时,固定化时间为8 h,降解率可达82.6%,并具有较好的机械强度.确定其对苯酚降解最适条件为pH 7.0,苯酚浓度为400 mg/L,温度32℃,接种量为25 g,培养时间42 h,其苯酚的降解率可达97.3%.该菌株固定化细胞的降解苯酚能力和耐受苯酚能力均大于游离细胞.固定化菌株对苯酚有较强的降解和耐受能力,是处理苯酚废水的良好菌种资源. 相似文献
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Gao JP Huang M Li N Wang PF Chen HL Xu QP 《Journal of Zhejiang University. Science. B》2011,12(4):264-272
A novel adsorber, polyvinylidene fluoride matrix immobilized with L-serine ligand (PVDF-Ser), was developed in the present
study to evaluate its safety and therapeutic efficacy in septic pigs by extracorporeal hemoperfusion. Endotoxin adsorption
efficiency (EAE) of the adsorber was firstly measured in vitro. The biocompatibility and hemodynamic changes during extracorporeal
circulation were then evaluated. One half of 16 pigs receiving lipopolysaccharide (Escherichia coli O111:B4, 5 μg/kg) intravenously in 1 h were consecutively treated by hemoperfusion with the new adsorber for 2 h. The changes
of circulating endotoxin and certain cytokines and respiratory function were analyzed. The 72 h-survival rate was assessed
eventually. EAE reached 46.3% (100 EU/ml in 80 ml calf serum) after 2 h- circulation. No deleterious effect was observed within
the process. The plasma endotoxin, interleukin-6 (IL-6), and tumor necrosis factor-α (TNF-α) levels were decreased during
the hemoperfusion. Arterial oxygenation was also improved during and after the process. Furthermore, the survival time was
significantly extended (>72 h vs. 47.5 h for median survival time). The novel product PVDF-Ser could adsorb endotoxin with
high safety and efficacy. Early use of extracorporeal hemoperfusion with the new adsorber could reduce the levels of circulating
endotoxin, IL-6, and TNF-α, besides improve respiratory function and consequent 72 h-survival rate of the septic pigs. Endotoxin
removal strategy with blood purification using the new adsorber renders a potential promising future in sepsis therapy. 相似文献