title: Novel high-sensitive fluorescent detection of deoxyribonuclease I based on DNA-templated gold/silver nanoclusters.
abstract: Herein, fluorescent DNA-templated gold/silver nanoclusters (DNA-Au/Ag NCs) are presented as a novel probe for sensitive detection of deoxyribonuclease I (DNase I). The procedure is based on quenching fluorescence of DNA-Au/Ag NCs by DNase I digestion of the DNA (5'-CCCTTAATCCCC-3') template. This decrease in fluorescence intensity permitted sensitive detection of DNase I in a linear range of 0.013-60 μg mL(-1), with a detection limit of 3 ng mL(-1) at a signal-to-noise ratio of 3. Furthermore, the practicality of this probe for detection of DNase I in human serum and saliva samples was validated, demonstrating its advantages of simplicity, selectivity, sensitivity and low cost. Importantly, satisfactory agreement between results obtained by the fluorescent method described here and high performance liquid chromatography (HPLC) further confirmed the reliability and accuracy of this approach.
authors.affiliation: College of Pharmaceutical Sciences, Southwest University, Chongqing 400716, China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Dou
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Yang
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D002851:Chromatography, High Pressure Liquid; D004247:DNA / Q000737:chemistry*; D003850:Deoxyribonuclease I / Q000032:analysis* / Q000097:blood; D006046:Gold / Q000737:chemistry*; D006801:Humans; D046529:Microscopy, Electron, Transmission; D008958:Models, Molecular; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012463:Saliva / Q000737:chemistry; D012680:Sensitivity and Specificity; D012834:Silver / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000295:instrumentation / Q000379:methods*; D013499:Surface Properties
chemical_list: D012834:Silver; D006046:Gold; D004247:DNA; D003850:Deoxyribonuclease I