A label-free fluorescence DNA probe based on ligation reaction with quadruplex formation for highly sensitive and selective detection of nicotinamide adenine dinucleotide. Zhao, J., Zhang, L., Jiang, J., Shen, G., & Yu, R. Chemical communications (Cambridge, England), 48(37):4468–70, May, 2012.
A label-free fluorescence DNA probe based on ligation reaction with quadruplex formation for highly sensitive and selective detection of nicotinamide adenine dinucleotide. [link]Paper  doi  abstract   bibtex   
A simple label-free fluorescent sensing scheme for sensitive and selective detection of nicotinamide adenine dinucleotide (NAD(+)) has been developed based on DNA ligation reaction with ligand-responsive quadruplex formation. This approach can detect 0.5 nM NAD(+) with high selectivity against other NAD(+) analogs.
@article{Zhao2012,
	title = {A label-free fluorescence {DNA} probe based on ligation reaction with quadruplex formation for highly sensitive and selective detection of nicotinamide adenine dinucleotide.},
	volume = {48},
	issn = {1364-548X},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/22456321},
	doi = {10.1039/c2cc30540b},
	abstract = {A simple label-free fluorescent sensing scheme for sensitive and selective detection of nicotinamide adenine dinucleotide (NAD(+)) has been developed based on DNA ligation reaction with ligand-responsive quadruplex formation. This approach can detect 0.5 nM NAD(+) with high selectivity against other NAD(+) analogs.},
	number = {37},
	journal = {Chemical communications (Cambridge, England)},
	author = {Zhao, Jingjin and Zhang, Liangliang and Jiang, Jianhui and Shen, Guoli and Yu, Ruqin},
	month = may,
	year = {2012},
	pmid = {22456321},
	keywords = {\#nosource, Base Sequence, Biosensing Techniques, Biosensing Techniques: methods, DNA, DNA: chemistry, DNA: genetics, Fluorescent Dyes, Fluorescent Dyes: chemistry, G-Quadruplexes, NAD, NAD: analysis, NAD: chemistry},
	pages = {4468--70},
}

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