MAL-dPEG®24-amido-dPEG®24-TFP ester, product number QBD-11303, is a monodisperse, crosslinking PEGylation reagent that joins sulfhydryl groups to amines through a long (158 atoms, 183.5 Å), single molecular weight, discrete PEG (dPEG®) chain. One end of the crosslinker is functionalized with a maleimidopropyl (maleimide) group for reaction with free thiols, and the other end has the 2,3,5,6-tetrafluorophenyl (TFP) ester of propionic acid for reaction with free amines. The dPEG® linker consists of two dPEG®24 chains joined by an amide bond, making it functionally a dPEG®48 crosslinker with a molecular weight that is slightly more than 2000 Daltons. At pH 6.5 – 7.5, the maleimide group reacts specifically with sulfhydryl (thiol) groups to form a thioether bond. The TFP ester reacts with free amines to form amide bonds at an optimum reaction pH range of 7.5 - 8.0.nCrosslinking free thiols to free amines is one of the most popular and most useful reactions in bioconjugate chemistry. These reactions require heterobifunctional reagents that bridge the two groups. Typical, traditional crosslinkers are short and hydrophobic and frequently trigger aggregation and precipitation of conjugates made from them. In addition, traditional PEG crosslinkers use non-uniform (dispersed) polymer PEGs that consist of an intractable mixture of PEG chain lengths and molecular weights. The complexity arising from non-uniform PEG crosslinkers makes analyzing conjugates a challenging exercise.nIn contrast, Vector Laboratories' dPEG® crosslinking products are water-soluble, amphiphilic, single molecular weight PEG compounds with discrete chain lengths. Our dPEG® products are uniform in chain length and molecular weight (Ð = 1). This uniformity of our dPEG® products eliminates one of the most vexing analytical difficulties faced by users of traditional polymer PEG products.
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Click Chemistry Tools(CCT)公司位于美国亚利桑那州斯科茨代尔(Scottsdale,AZ)。自公司成立以来,一致致力于不断开发和扩展一系列连接产品。他们利用特别新的研究成果研发生产出新颖的交联和标记试剂。产品被广泛用于药物研发、癌症治疗以及各类诊断技术等。此外,CCT还可以提供个性化的定制产品,已满足不同用户的需求。目前CCT的产品线主要包括:Azides(Biotin-Azides)试剂、Bis-sulfone交联试剂、DBCO试剂、TCO试剂、Terminal Alkyne试剂、Tetrazine试剂、标记试剂盒以及分选用底物等。nFluoroprobes公司位于美国亚利桑那州斯科茨代尔(Scottsdale, AZ),自成立以来,一直致力于不断开发一系列的连接(linker)产品。利用特别新的研究成果研发生产出各类新颖的交联和标记试剂。其产品被广泛用于药物研发与筛选、疾病治疗方法和诊断技术等领域。此外,Fluoroprobes还可以根据客户的个性化需求提供各类定制连接产品。代表产品有Classic Fluorescent Dyes, AZDye, Cyanine Dyes, IR Dyes, MB dyes以及一些标记试剂盒等。nQuanta Biodesign公司位于美国中部的俄亥俄州,成立于1997年。也是专注于生产研发各类标记产品的品牌之一。其研发的产品与dPEG技术相结合,生产出他们独有的专利产品dPEG Building Blocks and Linkers,被广泛用于细胞治疗和分子诊断等研究领域。另外,还可为广大科研工作者提供多种化学修饰试剂以及传统Liner等。n目前上述三个品牌都已被被Vectorlabs收购并整合到Vectorlabs产品中