GNPs–PEG@FITC 的制备及其在荧光成像中的应用
文献资料:Tumor angiogenesis targeting and imaging using gold nanoparticle probe with directly conjugated cyclic NGR†笔者:Minghao Wu‡ ORCID logoa, Yanyan Zhang‡a, Ying Zhanga, Mingjie Wub, Menglin Wua, Hongyi Wua, Lin Caoa, Liang Lia, Xue Li*a and Xuening Zhang*a论文参考文献微信链接://pubs.rsc.org/en/content/articlehtml/2018/ra/c7ra10155d前言:Preparation of FITC coupled GNPs–PEG@cNGR and GNPs–PEG.To prepare FITC coupled GNPs–PEG@cNGR and GNPs–PEG, 1 mg of the GNPs–PEG@cNGR probe, previously synthesized, was dispersed into 1 mL crosslinking reaction solution containing 7.56 mg Na2CO3, 1.06 mg NaHCO3, and 7.36 mg NaCl, sonicated for 2 min, and stored at 4 °C for 10 min. Subsequently, 0.3 mg FITC in 300 μL of DMSO was poured into the above solution under gentle and continuous stirring and incubated in the dark for 8 h at 4 °C. Next, 20 μL NH4Cl solution (5 M) was poured into the above solution under gentle and continuous stirring to terminate the above reaction and then incubated in the dark for 2 h at 4 °C. The final GNPs–PEG@cNGR@FITC was retrieved by ultrafiltration with a Millipore centrifugal filter unit (Amicon Ultra-0.5; MWCO 100[thin space (1/6-em)]000), washed three times, and resuspended in 0.5 mL of PBS (pH 7.4).In addition, FITC-conjugated GNPs–PEG (GNPs–PEG@FITC) was also prepared as a control. Briefly, the preparation was similar to the fabrication of GNPs–PEG@cNGR, but 220 μL SH–cNGR (1 mg mL−1) was replaced by 15 μL 2-aminoethanethiol (20 mM).