期刊
ANALYTICA CHIMICA ACTA
卷 444, 期 1, 页码 51-60出版社
ELSEVIER
DOI: 10.1016/S0003-2670(01)01150-3
关键词
fiber optic biosensor; DNA; hybridization; chemical DNA damage; oxidative DNA damage
This paper describes a fiber optic biosensor for the rapid and sensitive detection of radiation-induced or chemically-induced oxidative DNA damage. The assay is based on the hybridization and temperature-induced dissociation (melting curves) of synthetic oligonucleotides. The hybridization pair consists of a biotin labeled 38 mer oligonucleotide immobilized to a streptavidin-coated optical fiber and a fluorescently-labeled near-complementary (two base mismatch) oligonucleotide reporter sequence. The hybridization-based assay detected 50 nM labeled probe and could be run up to 10 times on the same fiber. Melting profiles were sensitive to high energy radiation and to 3-morpholinosydnonimine (SIN-1)-generated reactive decomposition products. The dynamic range of the assay for ionizing radiation extends from 20 to 1000 cGy. Oxidative damage induced by SIN-1 was measured over a concentration range of 250 muM to 3 mM. Published by Elsevier Science B.V.
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