英文名：ICG maleimide

            ICG-MAL

CAS：2143933-81-5

分子式:   C51H56N4O6S

分子量:   853.09

外 观：绿色粉末

溶解度：二氯甲烷

纯 度：95%+

结构式：

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.

近红外荧光染料Near IRDyes激发和发射波长和颜色图：

凯新生物ICG NHS ester的NHS可以和蛋白、多肽或抗体上面的NH2发生反应链接到一起。

ICG-maleimide的马来酰亚胺可以和蛋白、多肽、小分子或抗体上的SH巯基反应连接。

ICG-Amine的NH2可以和蛋白、多肽小分子上面的NHS反应连接起来。

ICG和PEG链接可在体内长循环。

 凯新生物ICG衍生物产品：

ICG修饰蛋白类产品

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