共查询到20条相似文献,搜索用时 78 毫秒
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本工作研究了我国人工养殖的海带叶片中褐藻糖的分布,及海带综合利用工业的废料碱凝沉物中褐藻糖胶的存在量和分离条件。海带叶片中的褐藻糖含量分布边缘比中部多,并从基部向尖部增加,即由0.3%增至1%以上。试验了用十六烷氯化吡啶法(CPC法)和乙醇沉淀法从碱凝沉物中分离褐藻糖胶的条件。两种方法的褐藻糖胶获得率分别为5.6%和4.4%(对干碱凝沉物),其中的褐藻糖含量分别为24.7%和28.7%。碱凝沉物中的褐藻糖含量为1.4~3.5%。还研究了从褐藻糖胶以酸水解制取褐藻糖的诸条件,并分离出纸层析纯的褐藻糖结晶。 相似文献
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本文研究了从铜藻中分离提取褐藻糖胶、褐藻淀粉和褐藻胶的方法。用稀盐酸溶液加温搅拌提取藻粉后,在提取液中含有褐藻糖胶和褐藻淀粉,可加乙醇至50%和80%分别将其沉淀出来。藻渣含有褐藻酸钠,可加温加碱而制备出。并用正交实验设计求出提取条件中的温度、pH和时间的最适配比。对于褐藻糖胶的提取,以温度70℃、时间2小时和提取液pH为4时最适。对于褐藻淀粉的提取,以温度70℃、时间1小时和提取液的pH为2时较优。本文还对粗褐藻糖胶和褐藻淀粉的提纯进行了研究,证明二者均可用酒精分级沉淀法处理而得到纯品,不需要采用较复杂的季胺盐法和离子交换树脂法。本工作证实铜藻是我国褐藻中含有三种多糖的较好藻种,从中可提褐藻糖胶3.5%,褐藻淀粉3.1%和褐藻酸钠17.8%。 相似文献
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鱿鱼鱼精蛋白的提取_纯化及其生化特性 总被引:16,自引:0,他引:16
鱼精蛋白(Protamine)是一种常与DNA结合,存在于鱼类成熟精巢中的碱性蛋白。由于其生化组成的特点,鱼精蛋白不仅具有促使细胞发育繁殖的作用,而且一旦将其分离出来,能有效抑制多种食品腐败菌的生长和繁殖[Miler1942]。同时,这种鱼精蛋白还有... 相似文献
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糖胺聚糖在许多生物学、生理学起着重要的作用,同时由于糖胺聚糖在体内的代谢紊乱而导致了许多糖胺聚糖类疾病,已引起世界医学界的广泛关注。国内外已对糖胺聚糖进行了大量的研究,本文综述了糖胺聚糖的提取、分离方法,并展望了其发展趋势。 相似文献
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Caipang CM Lazado CC Berg I Brinchmann MF Kiron V 《Fish physiology and biochemistry》2011,37(3):603-612
The present study investigated the immunomodulatory activities of alginic acid and fucoidan, both derived from brown seaweeds,
on selected cellular immune responses and antibacterial activity of head kidney (HK) leukocytes of cod, Gadus morhua. Primary cultures of HK leukocytes were incubated with either 10 or 100 μg ml−1 of the substances and the effects on respiratory burst, cellular proliferation, acid and alkaline phosphatase activity and
cellular myeloperoxidase were measured at 3- and 24-h post-incubation. The antibacterial activity of the supernatants collected
from the cell cultures incubated with 100 μg ml−1 of the substances were tested against Vibrio anguillarum and Aeromonas salmonicida. Respiratory burst was significantly elevated in cells incubated with either alginic acid or fucoidan in a dose-dependent
manner. Incubation with a higher dose of alginic acid and fucoidan resulted in lower cellular proliferation at 3- and 24-h,
respectively. Both acid and alkaline phosphatase activities of HK leukocytes were not significantly modulated, except for
a slight elevation of acid phosphatase in cells incubated with 100 μg ml−1 of alginic acid for 24-h. Fucoidan, but not alginic acid significantly increased cellular myeloperoxidase activity at a concentration
of 100 μg ml−1. The growth of the bacteria in both the treated and control supernatants was significantly lower than what was observed in
the bacterial culture medium. However, the supernatants from the treated cells had significantly higher bacterial growth compared
with supernatants of the control cells. Taken together, these results showed that at the tested concentrations, both alginic
acid and fucoidan are able to differentially stimulate some cellular immune responses of cod HK leukocytes in vitro and the
respiratory burst activity was significantly stimulated by these brown algal derivatives. These substances could be tested
as potential immunostimulants in future in vivo studies. 相似文献
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猪囊尾蚴病是猪带绦虫的幼虫引起人、畜共患的寄生虫病。它严重影响养猪事业的发展,使畜牧业造成重大经济损失,给人民身体健康和生命带来严重威胁。为有效控制和消灭猪囊尾蚴病,维护人民的生命和财产安全,笔者通过对病原特性、传播方式和主要危害进行浅析,归纳出一套有效的防治措施,给猪囊尾蚴病的防治提供参考。 相似文献
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海洋微生物溶菌酶发酵液经低温离心、超滤浓缩、乙醇提取、Superdex 75 10/300凝胶层析和反相高效液相色谱层析纯化得到电泳纯海洋溶菌酶,分子量为17.1 kD,比活达到3 987.7 U/mg,纯度提高41.98倍,活力回收率为21.7%。对该酶冷冻干燥过程的研究结果表明,海藻糖、蔗糖和麦芽糖对该酶均有一定的冻干保护作用。其中,以海藻糖的保护效果最佳。0.5 mol/L海藻糖与20 mg/ml吐温80复合作为冻干保护剂,使冻干后的溶菌酶活性维持在95%以上,为该酶进一步研究和应用提供了稳定的酶制剂。 相似文献
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利用生物滤池模拟装置,以实际养殖废水为处理对象,探讨了4种常见有机碳源(葡萄糖、乙醇、红糖和淀粉)及不同碳氮比对有机物去除、硝化反应和异养反硝化作用等生物滤池主要净化过程的影响.碳源初选结果显示,同种碳源下,当C/N从0升高至6过程中,生物滤池对TAN(总氨氮)的去除率呈先升高后降低趋势;当C/N较小时,各组对NO2--N的去除率差异性不显著(P>0.05),随着C/N继续升高,NO2-N去除率则显著降低(P<0.05);乙醇组除外,其他3组随着C/N升高,CODMn去除率先迅速增大然后趋于稳定;各组NO3-N和TN去除率呈先升高后降低趋势,且变化显著(P<0.05),当C/N=4时,分别达到最高值.碳源复选结果显示,在C/N=4条件下,分别添加有机碳源(乙醇、淀粉、红糖和葡萄糖)的4组对TAN、NO3--N、TN和CODM的去除率显著高于对照组(P<0.05);而对照组NO2--N的去除率最高,达到93.59%;添加乙醇,生物滤池对水体中TAN、NO2-N、NO3-N和TN的去除效果优于其他3种碳源.研究表明,当C/N=4时,乙醇作为外加碳源能很好地提高生物滤池的净化效率. 相似文献