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含笑半步颠

木虫 (正式写手)

[求助] 脂肽纯化 已有1人参与

我现在做脂肽的分离纯化,就是从发酵液中分离提纯脂肽,用的是超滤纯化。碰到一个奇怪的现象,最后得到的浓缩液很粘稠,静止一会后就成了果冻状的!这到底是怎么回事?
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calorimetry

铜虫 (正式写手)

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Lipopeptide :
From Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Lipopeptide

"A lipopeptide is a molecule consisting of a lipid connected to a peptide. Bacteria express these molecules. They are bound by TLR 1, and other Toll-like receptors.
Certain lipopeptides are used as antibiotics.Certain lipopeptides could have strong anifungtal and hemolytic activities. It has been demonstrated that their activity is generally linked to interactions with the plasma membrane  and sterol components of plasma membrane could play a major role and can be their privileged partner of interaction."
7楼2015-06-12 14:55:11
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calorimetry

铜虫 (正式写手)

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感谢参与,应助指数 +1
溶解性不好可以加入一些表面活性剂,如果要超滤,可以多加一些,因为超滤会滤去小分子。
2楼2015-06-12 09:55:45
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含笑半步颠

木虫 (正式写手)

引用回帖:
2楼: Originally posted by calorimetry at 2015-06-12 09:55:45
溶解性不好可以加入一些表面活性剂,如果要超滤,可以多加一些,因为超滤会滤去小分子。

脂肽本身就是一种表面活性剂,它就在我得到的浓缩液里面,浓缩液很粘稠,静止后就成了果冻状的东西!想问下为什么会形成果冻?
3楼2015-06-12 12:32:25
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calorimetry

铜虫 (正式写手)

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表面活性剂并不一定会溶解,果冻状肯定是形成了非公价的多聚体,适当稀释一下,温和搅拌会好一些。更详细的东西,我需要查阅表面活性剂化学的内容,你也可以自己查一下。
4楼2015-06-12 14:28:14
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