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英文名：ICG maleimide

             ICG-MAL

CAS：2143933-81-5

分子式:   C51H56N4O6S

分子量:   853.09

外 觀：綠色粉末

溶解度：二氯甲烷
純 度：95%+
結構式：

ICG is a tricarbocyanine-type dye with NIR-absorbing properties (peak absorption around 800 nm) and emission maximum at 807 nm (10% v/vDMSO/PBS). Little absorption in the visible range accounts for the low autofluorescence, tissue absorbance, and scattering at NIR wavelengths (700-900 nm).

The maleimide of the ICG dye offers the opportunity to develop optimal conjugates. Maleimide active group provides an efficient and convenient way to selectively link ICG dye to sulfhydryl groups (free thiol, R-SH) on various substrates (antibodies[1], peptides, proteins, oligonucleotides, small molecule drugs etc.) at neutral (physiological) pH without any activation. Maleimides have very low reactivity with amines, alcohols, and phenols (incl. tyrosine and histidine) and do not react with histidine and methionine thus providing very high labeling selectivity.

It has been reported that conjugation to some antibodies may cause decrease in fluorescence intensity of ICG bound to antibody due to the formation of H-dimers4. However, fluorescence is restored after cell binding and internalization, which can be used to design an activatable NIR fluorescent probe. Fluorescence intensity of the unbound ICG-antibody conjugate can be dramatically increased (up to 50-fold) by addition of SDS and β-mercaptoethanol, which diminishes π- π stacking5.

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近紅外熒光染料Near IRDyes激發(fā)和發(fā)射波長和顏色圖：

ICG NHS ester的NHS可以和蛋白、多肽或抗體上面的NH2發(fā)生反應鏈接到一起。

ICG-maleimide的馬來酰亞胺可以和蛋白、多肽、小分子或抗體上的SH巰基反應連接。

ICG-Amine的NH2可以和蛋白、多肽小分子上面的NHS反應連接起來。

ICG和PEG鏈接可在體內(nèi)長循環(huán)。

  
ICG衍生物產(chǎn)品：
ICG修飾蛋白類產(chǎn)品
ICG-Avidin
ICG-Streptavidin
ICG-BSA      
ICG-Dextran
ICG-Alginate
ICG-Chitosan
ICG-Hyaluronic acid
ICG-Heparin
ICG-Ficoll
ICG-Cellulose
ICG-Concanavalin A
ICG-Transferrin
ICG-Polylysine
ICG NHS ester
ICG Vinylsulfone
ICG isothiocyanate
ICG Carboxlaic acid
ICG Maleimide
ICG amine
ICG thiol
ICG dichlorotriazine
ICG Hydrazide
ICG alkyne
ICG Avidin
ICG Biotin