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. In this methodology, antibodies are simply attached to the PEG terminus of liposomes, which had been endgroup-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.

ImmunoFluor™-Cyanur is a PEGylated product. For other reactive (PEGylated and non-PEGyalated products) ImmunoFluor™ products suitable for other types conjugation methods see here.
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百奥森18分钟霉菌毒素检测试剂盒,有需要的可以了解下!多种规格型号可供选择
产品名称
黄曲霉毒素B1(AFB1)酶免检测试剂盒
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牛胰岛素,是一种多肽
在1965年9月17日我国完成了结晶牛胰岛素的全合成。经过严格鉴定,它的结构、生物活力、物理化学性质、结晶形状都和天然的牛胰岛素完全一样。这是世界上第一个人工合成的蛋白质,为人类认识生命、揭开生命奥秘迈出了可喜的一大步。这项成果获1982年中国自然科学一等奖。
1953年,英国人F. SangerSanger由于测定了牛胰岛素的一级结构而获得1958年诺贝尔化学奖。
我用Promega公司的双荧光素酶检测试剂盒(E2920)检测到的firefly萤光素酶活性很低,只有4*10的3次方;海肾萤光素酶活性有10的6次方。
我用Ad293细胞做了转染,fireflyluciferase质粒:RanillaLuciferase质粒=0.1ug:0.025ug/一个孔(96孔板),共转染了二天,再进行双萤光素酶检测。
我想了解fireflyluciferase活性用promega的这个E2920-双萤光素酶试剂盒检测得到10的3次方,这种数值正常吗?
我做了3次重复实验,每次firefly萤光素酶活性很低,只有4*10的3次方;而海肾萤光素酶活性有10的6次方。
求指教?fireflyluciferase活性低?会是什么原因呢?
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