Synthesis and fluorescent characteristics of imidazole–indocyanine green conjugates
摘要:
We have successfully synthesized imidazole-dye conjugates by linking imidazole and nitroimidazoleacetic acids to an indocyanine green (ICG) carboxylic acid derivative using an ethanolamine linker These dye-conjugates show absorbance peaks at 754-756 nm and fluorescence peaks at 780 rim The dye-conjugates show a blue shift of 25 nm and 30 nm in the absorption and fluorescence spectra respectively when compared to that of standard cardiogreen There is no change in absorption and fluorescence spectral profiles between the ICG derivative and imidazole conjugates The extinction coefficients of new ICG derivative and imidazole conjugates are 1 8 times higher than that of standard ICG The relative quantum yields of the new compounds are 4 5-5 5 times higher than that of the Sigma-Aldrich s ICG The dyes are tested for hypoxia in-vitro with 4T1 luc cell lines and it is found that the cells treated with 2-nitroimidazole ICG show a contrast of fluorescence signal of 2 5-30 for the cells under hypoxic to that of cells under normoxic However pure ICG shows no significant difference between hypoxic and normoxic cells (C) 2010 Elsevier Ltd All rights reserved
Synthesis and fluorescent characteristics of imidazole–indocyanine green conjugates
摘要:
We have successfully synthesized imidazole-dye conjugates by linking imidazole and nitroimidazoleacetic acids to an indocyanine green (ICG) carboxylic acid derivative using an ethanolamine linker These dye-conjugates show absorbance peaks at 754-756 nm and fluorescence peaks at 780 rim The dye-conjugates show a blue shift of 25 nm and 30 nm in the absorption and fluorescence spectra respectively when compared to that of standard cardiogreen There is no change in absorption and fluorescence spectral profiles between the ICG derivative and imidazole conjugates The extinction coefficients of new ICG derivative and imidazole conjugates are 1 8 times higher than that of standard ICG The relative quantum yields of the new compounds are 4 5-5 5 times higher than that of the Sigma-Aldrich s ICG The dyes are tested for hypoxia in-vitro with 4T1 luc cell lines and it is found that the cells treated with 2-nitroimidazole ICG show a contrast of fluorescence signal of 2 5-30 for the cells under hypoxic to that of cells under normoxic However pure ICG shows no significant difference between hypoxic and normoxic cells (C) 2010 Elsevier Ltd All rights reserved
Synthesis of β-hydroxyacetamides from unactivated ethyl acetates under base-free conditions and microwave irradiation
作者:Eugenio Hernández-Fernández、Pedro Pablo Sánchez-Lara、Mario Ordóñez、Oscar Abelardo Ramírez-Marroquín、Francisco G. Avalos-Alanís、Susana López-Cortina、Víctor M. Jiménez-Pérez、Tannya Rocio Ibarra-Rivera
DOI:10.1016/j.tetasy.2014.11.015
日期:2015.1
unactivated ethyl esters with achiral and chiral 1,2-amino alcohols under microwave irradiation and base-free conditions is described. This procedure provides a convenient method for the synthesis of β-hydroxyacetamides bearing pyrazole, imidazole, and benzimidazole groups in high yields and without racemization. The protocol described herein is environmentally friendly and allows for the preparation of a
Methods for detecting a target polynucleotide sequences are provided that utilize a probe having a target-complementary segment and a detectable tag. By cleaving the detectable tab and associating the tag with a tag complement coupled to an electrode, an electrochemical signal can be detected that is related to the presence of the tag:tag complement complex.
Synthesis and fluorescent characteristics of imidazole–indocyanine green conjugates
作者:Christopher Pavlik、Nrusingh C. Biswal、Faith Corbo Gaenzler、Martha D. Morton、Liisa T. Kuhn、Kevin P. Claffey、Quing Zhu、Michael B. Smith
DOI:10.1016/j.dyepig.2010.08.008
日期:2011.4
We have successfully synthesized imidazole-dye conjugates by linking imidazole and nitroimidazoleacetic acids to an indocyanine green (ICG) carboxylic acid derivative using an ethanolamine linker These dye-conjugates show absorbance peaks at 754-756 nm and fluorescence peaks at 780 rim The dye-conjugates show a blue shift of 25 nm and 30 nm in the absorption and fluorescence spectra respectively when compared to that of standard cardiogreen There is no change in absorption and fluorescence spectral profiles between the ICG derivative and imidazole conjugates The extinction coefficients of new ICG derivative and imidazole conjugates are 1 8 times higher than that of standard ICG The relative quantum yields of the new compounds are 4 5-5 5 times higher than that of the Sigma-Aldrich s ICG The dyes are tested for hypoxia in-vitro with 4T1 luc cell lines and it is found that the cells treated with 2-nitroimidazole ICG show a contrast of fluorescence signal of 2 5-30 for the cells under hypoxic to that of cells under normoxic However pure ICG shows no significant difference between hypoxic and normoxic cells (C) 2010 Elsevier Ltd All rights reserved