title: Modulation of the Singlet Oxygen Generation from the Double Strand DNA-SYBR Green I Complex Mediated by T-Melamine-T Mismatch for Visual Detection of Melamine.
abstract: Singlet oxygen (1O2), generated via photosensitization, has been proved to oxidize chromogenic substrates with neither H2O2oxidation nor enzyme (horseradish peroxidase, HRP) catalysis. Of the various methods for modulation of the1O2generation, DNA-controlled photosensitization received great attention. Therefore, integration of the formation/deformation DNA structures with DNA-controlled photosensitization will be extremely appealing in visual biosensor developments. Here, the stable melamine-thymine complex was explored in combination with DNA-controlled photosensitization for visual detection of melamine. A T-rich single stand DNA was utilized as the recognition unit. Upon the formation of the T-M-T complex, double stand DNA was formed, which was ready for the binding of SYBR Green I and activated the photosensitization. Subsequent oxidation of TMB allowed visual detection of melamine in dairy products, with spike-recoveries ranging from 94% to 106%.
authors.forename: Hao
authors.initials: H
authors.lastname: Hu
authors.forename: Jinyi
authors.initials: J
authors.lastname: Zhang
authors.forename: Yu
authors.initials: Y
authors.lastname: Ding
authors.affiliation: College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology , Chengdu 610059, China.
authors.forename: Xinfeng
authors.initials: X
authors.lastname: Zhang
authors.forename: Kailai
authors.initials: K
authors.lastname: Xu
authors.forename: Xiandeng
authors.initials: X
authors.lastname: Hou
authors.forename: Peng
authors.identifier: 0000-0002-9128-9027
authors.initials: P
authors.lastname: Wu
mesh_terms: D000818:Animals; D020137:Base Pair Mismatch; D001560:Benzidines / Q000737:chemistry; D052160:Benzothiazoles; D015374:Biosensing Techniques / Q000379:methods*; D002863:Chromogenic Compounds / Q000737:chemistry; D003124:Colorimetry / Q000379:methods; D004277:DNA, Single-Stranded / Q000737:chemistry* / Q000235:genetics; D003959:Diamines; D005506:Food Contamination / Q000032:analysis; D006860:Hydrogen Bonding; D008027:Light; D008892:Milk / Q000737:chemistry; D009930:Organic Chemicals / Q000737:chemistry* / Q000528:radiation effects; D011804:Quinolines; D026082:Singlet Oxygen / Q000737:chemistry*; D013941:Thymine / Q000737:chemistry*; D014227:Triazines / Q000032:analysis*
chemical_list: D001560:Benzidines; D052160:Benzothiazoles; D002863:Chromogenic Compounds; D004277:DNA, Single-Stranded; D003959:Diamines; D009930:Organic Chemicals; D011804:Quinolines; D014227:Triazines; C098022:SYBR Green I; D026082:Singlet Oxygen; C021758:3,3',5,5'-tetramethylbenzidine; C011907:melamine; D013941:Thymine