Bis-dPEG?25-NHS ester, product number QBD-10968, is a homobifunctional, amine-reactive, single molecular weight PEG crosslinker with a long (79 atoms, 93.0 ?) discrete PEG (dPEG?) chain length. Each end of the chain terminates as the N-hydroxysuccinimidyl (NHS) ester of propionic acid. Unlike traditional hydrophobic crosslinkers, Bis-dPEG?25-NHS ester will not cause problems such as aggregation, precipitation, and inactivation when conjugated to biomolecules. As a homobifunctional, amine-reactive crosslinker, the primary uses for QBD-10968 are intermolecular conjugation of biomolecules with free, surface-accessible amines and intramolecular modification of biomolecules using free, surface-accessible amines. Because QBD-10968 is one in a line of similar products, Bis-dPEG?25-NHS ester can be used with other products in the same line to probe the effect of different linker lengths on the performance of crosslinked or intramolecularly modified biomolecules.nNHS esters react with free amines such as the e-amines of lysine. The optimal pH range for NHS esters to react with free amines is 7.0 – 7.5. However, NHS esters can react with free amines with pH as low as 6.5. NHS esters are susceptible to hydrolysis in aqueous media. As the pH increases, the hydrolysis rate of the ester increases. Thus, we strongly discourage storing Bis-dPEG?25-NHS ester in water or aqueous buffer. Instead, we recommend that customers make new solutions of the product as needed, use them immediately, and discard unused solutions after use. If customers desire to store the product in solution, we recommend the use of a pure, anhydrous, water-miscible solvent such as dimethyl sulfoxide (DMSO), N,N-dimethylacetamide (DMAC), or N,N-dimethylformamide (DMF). DMSO, DMAC, or DMF can be dried chemically or by storing for a minimum of 24 hours over 3 ? molecular sieves. With DMF, use only fresh solvent as the compound decomposes over time to form free amines that will react with the NHS esters.
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Click Chemistry Tools(CCT)公司位于美國(guó)亞利桑那州斯科茨代爾(Scottsdale,AZ)。自公司成立以來(lái),一致致力于不斷開(kāi)發(fā)和擴(kuò)展一系列連接產(chǎn)品。他們利用特別新的研究成果研發(fā)生產(chǎn)出新穎的交聯(lián)和標(biāo)記試劑。產(chǎn)品被廣泛用于藥物研發(fā)、癌癥治療以及各類(lèi)診斷技術(shù)等。此外,CCT還可以提供個(gè)性化的定制產(chǎn)品,已滿足不同用戶的需求。目前CCT的產(chǎn)品線主要包括:Azides(Biotin-Azides)試劑、Bis-sulfone交聯(lián)試劑、DBCO試劑、TCO試劑、Terminal Alkyne試劑、Tetrazine試劑、標(biāo)記試劑盒以及分選用底物等。nFluoroprobes公司位于美國(guó)亞利桑那州斯科茨代爾(Scottsdale, AZ),自成立以來(lái),一直致力于不斷開(kāi)發(fā)一系列的連接(linker)產(chǎn)品。利用特別新的研究成果研發(fā)生產(chǎn)出各類(lèi)新穎的交聯(lián)和標(biāo)記試劑。其產(chǎn)品被廣泛用于藥物研發(fā)與篩選、疾病治療方法和診斷技術(shù)等領(lǐng)域。此外,F(xiàn)luoroprobes還可以根據(jù)客戶的個(gè)性化需求提供各類(lèi)定制連接產(chǎn)品。代表產(chǎn)品有Classic Fluorescent Dyes, AZDye, Cyanine Dyes, IR Dyes, MB dyes以及一些標(biāo)記試劑盒等。nQuanta Biodesign公司位于美國(guó)中部的俄亥俄州,成立于1997年。也是專(zhuān)注于生產(chǎn)研發(fā)各類(lèi)標(biāo)記產(chǎn)品的品牌之一。其研發(fā)的產(chǎn)品與dPEG技術(shù)相結(jié)合,生產(chǎn)出他們獨(dú)有的專(zhuān)利產(chǎn)品dPEG Building Blocks and Linkers,被廣泛用于細(xì)胞治療和分子診斷等研究領(lǐng)域。另外,還可為廣大科研工作者提供多種化學(xué)修飾試劑以及傳統(tǒng)Liner等。n目前上述三個(gè)品牌都已被被Vectorlabs收購(gòu)并整合到Vectorlabs產(chǎn)品中