During the past five decades, various types of chemistries have been used for conjugation of molecules such as antibodies, peptides, proteins or other reactive ligands to the surface of liposomes. In general, the conjugation can be achieved through the N-terminus, the C-terminus or the available sulfur (e.g. Fab’ fraction or thiolated antibodies). Not all chemistries have the same yield and efficiency of conjugation and often reproducing biocompatible batches can be a challenge.
Copper-free click chemistry is a fairly new chemistry that has been commercialized during the past few years. More and more click chemistry-based reagents are becoming available commercially which makes the formulation development much easier for scientists. The great advantage of this chemistry is biocompatibility since no cytotoxic copper catalyst is required. By far, click chemistry is the most efficient and easiest conjugation chemistry available for coupling of antibodies and other reactive ligands to the surface of the liposomes. The conjugation chemistry is based on the reaction of the dibenzocyclooctyne (DBCO) reagent with an azide linker to form a stable triazole. DBCO moiety can be on the antibody and azide moiety can be on liposomes and vice versa.
This conjugation protocol is based on the reaction of the dibenzocyclooctyne (DBCO) group of the liposomes with an azide linker on the antibody, peptide or proteins. There are many commercialized reagents that can be used for azide modification of proteins, peptides and antibodies. To see the list of commercialized reagents for azide modification see here.
For other amine reactive (PEGylated and non-PEGyalated products) and also ImmunoFluor™ products suitable for other types conjugation methods see here.
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用Mabteck公司的ALP标记抗体吧，配合Millipore公司的Multiscreen-IP96孔板，所有的试剂都可以减半，照样可以出非常好的结果，4*96孔的试剂盒我一直做8*96孔，但BCIP/NBT显色液没试过减半，因为它很便宜。记得当年第一次做实验就出了很好的结果，经过不断摸索，做出的蓝紫色斑点确实非常漂亮，几乎没有非特异斑点，嗯，ELISPOT是我最拿手的实验之一。
关于PBMC:
拿到血液标本后，首先我要做的是尽快分离PBMC（一般2h内），国产的分离液里天津灏洋的比较好，然后用冻存液冻存PBMC。PBMC的冻存过程比一般的细胞株要更为严格，最好用冻存器。ELISPOT试验的第一天，在包被抗体的同时，将细胞复苏，完全培养液培养过夜，第二天收集细胞并计数即可。
尤其是获得SCI文献引用的产品，
绝对ok的
请问一般的实验室可以进行ELIspot吗？（我可以买到现成的试剂盒，资金这个应该没有问题。）ELIspot的难点在哪里？多谢大虾们的指点！这个对我很重要，多谢！！！
