Biotinylated liposomes can be conjugated non-covalently with (strept)avidin through either direct interaction with the protein/antibody conjugated to (strept)avidin or by coupling with other biotinylated proteins using (strept)avidin as a bridging molecule. Both avidin and (strept)avidin form strong non-covalent bond with biotin. The high resistance to breakdown makes them very useful in bioconjugate chemistry. However, (strept)avidin has replaced avidin in most bioconjugation applications due to its enhanced properties. NeutrAvidin (ThermoFisher) is a modified avidin without negative properties. It performs much better than original avidin and sometimes (strept)avidin.
In order to exploit the high-affinity interaction of biotin with (strept)avidin, a two-step “sandwich” protocol (Method A) has been developed for the preparation of targeted immunoliposomes. In this methodology, (strept)avidin is first attached to biotinylated liposomes, then a biotin-modified protein/antibody is introduced into the biotinylated (strept)avidin-labeled liposomes. This non-covalent approach is rapid, extremely versatile and applicable to numerous targeting ligands of interest with respect to in vitro and in vivo applications. Alternatively, instead of forming a (strept)avidin bridge, (strept)avidin molecule can also be covalently conjugated to antibody or ligand (Method B) and non-covalently bound to liposomes containing biotin on surface in order to form immunoliposomes.
ImmunoFluor™-Biotinyl Cap is a Non-PEGylated product. For other reactive (PEGylated and non-PEGyalated products) biotinylated liposomes and also ImmunoFluor™ products suitable for other types conjugation methods see here.
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将来可能会出现基于免疫方法的试剂盒，不过因为H7N9是个新病毒，爆发至今不足一月，这么快时间还来不及生产抗体，所以目前的检测试剂盒只能是PCR检测试剂盒。
查到了：
4月7日，上海之江生物科技有限公司官方微博称，该公司成功研制禽流感H7N9(2013)核酸测定试剂盒(荧光PCR法)，是针对国内此次H7N9病毒最早研制成功的产品，也是国内目前唯一供应的成品化试剂盒。
