Preparation of ferrocene-functionalized gold nanoparticles by primer extension reaction on the particle surface
摘要:
DNA molecules possessing multiple ferrocene (Fc) molecules as a redox active probe were prepared by the primer extension (PEX) reaction using a 2'-deoxyuridine-5'-triphosphate derivative in which Fc was connected to the C5-position of the uridine by a diethylene glycol linker. Gold nanoparticles (AuNP) covered with DNA possessing the Fc molecules were prepared by the PEX reaction on the surface. The AuNP-FcDNA conjugates exhibit a detectable electrochemical signal due to the Fc molecules. Possible application of the PEX reaction on AuNP is demonstrated for the detection of a single nucleotide mutation in the target DNA. (C) 2014 Elsevier Ltd. All rights reserved.
The invention provides a method of probing for a nucleic acid comprising: contacting a nucleic acid solution with an oligonucleotide probe labelled with an electrochemically active marker, providing conditions at which the probe is able to at least partially hybridise with any complementary target sequence which may be present in the nucleic acid solution, selectively degrading either hybridised, partially hybridised or unhybridised nucleic acid probe, and electrochemically determining information relating to the electrochemically active marker. The invention further provides novel molecules with use in methods of the invention.
Electrochemical primer extension for the detection of single nucleotide polymorphisms in the cardiomyopathy associated MYH7 gene
作者:A. M. Debela、S. Thorimbert、B. Hasenknopf、C. K. O'Sullivan、M. Ortiz
DOI:10.1039/c5cc07762a
日期:——
We report the labelling of dideoxy nucleotides (ddNTPs) for use in electrochemical array based primer extension for the detection of single nucleotide polymorphisms (SNPs).
pH- and Thiol-Responsive BODIPY-Based Photosensitizers for Targeted Photodynamic Therapy
作者:Xiong-Jie Jiang、Janet T. F. Lau、Qiong Wang、Dennis K. P. Ng、Pui-Chi Lo
DOI:10.1002/chem.201600452
日期:2016.6.6
dithiothreitol (DTT), these linkers were cleaved selectively. The separation of the BODIPY core and the ferrocenyl moieties restored the photoactivities of the former in phosphate buffered saline and inside the MCF‐7 breast cancer cells, rendering these compounds as potential activable photosensitizers for targetedphotodynamictherapy. The dual activable analogue exhibited the greatest enhancement in intracellular
通过酸不稳定的缩酮和/或硫醇可裂解的二硫键将二碘二苯乙烯基二甲基吡啶二硼化(BODIPY)核心与两个二茂铁猝灭剂共轭,通过荧光诱导的电子转移过程显着淬灭了它们的荧光和光敏特性。包含缩酮或二硫键的两个对称类似物只能通过单一刺激激活,而非对称类似物对双重刺激有反应。与酸和/或二硫苏糖醇(DTT)相互作用后,这些接头被选择性切割。BODIPY核心和二茂铁基部分的分离恢复了前者在磷酸盐缓冲盐水和MCF-7乳腺癌细胞内部的光活性,使这些化合物成为潜在的可活化光敏剂,用于靶向光动力疗法。在酸性环境(pH 5)和DTT(4 mm)。与4 m m的DTT预孵育后,其对MCF-7细胞的光细胞毒性也增加了约两倍。该化合物的活化在携带HT29人结肠直肠癌的裸鼠中也得到证实。瘤内注射后9小时内观察到肿瘤中荧光强度的显着增加。