In order to develop a rapid and straightforward coupling procedure at the PEG terminus, a method of direct coupling antibodies to the PEG terminus of liposomes was introduced by Bendas et al. [1]. In this methodology, antibodies are simply attached to the PEG terminus of liposomes, which had been end-group functionalized with cyanuric chloride, in mild basic conditions (pH 8.8) without prior antibody derivatizations. It has been shown that in order to obtain a stable attachment of proteins on liposome, the DSPE-PEG-cyanur was added into the liposomes to chemically conjugate with proteins to form a stable complex and minimize the denaturation of proteins.
Proteins can be covalently coupled to the liposomes via amine-reactive cyanur-groups, either directly to the vesicle surface using cyanuric chloride-activated DSPE (cyanur-DSPE) or to the distal ends of PEG-spacers using activated cyanur-PEG-PE (ammonium salt). Cyanuric chloride at the PEG terminus functions to link peptides, antibodies and other amine-containing biomolecules or nanoparticles via a nucleophilic substitution reaction under basic conditions. Antibodies or other proteins can be conjugated without any previous derivatization.
Immunosome®-Cyanur is a PEGylated product. For other amine reactive (PEGylated and non-PEGyalated products) and also Immunosome® products suitable for other types conjugation methods see here.
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一、免疫组化试剂盒一般包括：
1、特异性的一抗
2、免疫组化检测系统。
3、有的同时还具备显色系统。
二、不同的公司内容有差别，所以购买时一定了解清楚：
1、一抗是做人的还是兔、鼠的组织；
2、检测系统是ABC/SP/非生物素/其他；
3、试剂盒的内容都有什么？有没有显色系统？
4、如果没有，自己根据前面的检测系统需配哪个显色系统。（其他的辅助试剂如PBS缓冲液、抗原修复液等一般另卖或自配）
三、免疫组化抗体即指特异性一抗，是用来标记的指标，免疫组化过程的其他试剂一律另外配备。
另外：做实验时，如遇出结果困难，记得做阳性片对照，敢于怀疑检测系统或显色系统的问题。
蛋白的类型为PDGF。其有一种二聚体为PDGF-BB。
请教第一点：我看了Elisa的说明书，现在检测PDGF有两种试剂盒，一种是检测PDGF的，要求的试剂样本为组织匀浆；一种是检测PDGF-BB的，要求的待测样本为血液或血浆。
我现在的实验目的是想更精确，检验组织中的PDGF-BB，但是手中的是人体韧带组织样本，非PDGF-BB试剂盒所要求的组织样本为血浆或血清，我不知道是否可以用PDGF-BB的ELISA试剂盒的来做，所以特地请教：）
请教第二点：市面上有RB公司的96T，2500元；另外有Uscnlife的Elisa试剂盒，96T的3680元，都说是原装进口的，我该如何选择呢？为何差价这么多？谢谢指点！
