title: PVP-coated graphene oxide for selective determination of ochratoxin A via quenching fluorescence of free aptamer.
abstract: In this paper, we developed a simple method to detect fungi toxin (ochratoxin A) produced by Aspergillus Ochraceus and Penicillium verrucosumm, utilizing graphene oxide as quencher which can quench the fluorescence of FAM (carboxyfluorescein) attached to toxin-specific aptamer. By optimizing the experimental conditions, we obtained the detection limit of our sensing platform based on bare graphene oxide to be 1.9 μM with a linear detection range from 2 μM to 35 μM. Selectivity of this sensing platform has been carefully investigated; the results showed that this sensor specifically responded to ochratoxin A without interference from other structure analogues (N-acetyl-l-phenylalanine and warfarin) and with only limited interference from ochratoxin B. Experimental data showed that ochratoxin A as well as other structure analogues could adsorb onto the graphene oxide. As compared to the non-protected graphene oxide based biosensor, PVP-protected graphene oxide reveals much lower detection limit (21.8 nM) by two orders of magnitude under the optimized ratio of graphene oxide to PVP concentration. This sensor has also been challenged by testing 1% red wine containing buffer solution spiked with a series of concentration of ochratoxin A.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China.
authors.forename: Linfeng
authors.initials: L
authors.lastname: Sheng
authors.forename: Jiangtao
authors.initials: J
authors.lastname: Ren
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Miao
authors.forename: Jiahai
authors.initials: J
authors.lastname: Wang
authors.forename: Erkang
authors.initials: E
authors.lastname: Wang
mesh_terms: D052157:Aptamers, Nucleotide / Q000737:chemistry*; D015374:Biosensing Techniques / Q000379:methods*; D005453:Fluorescence; D006108:Graphite / Q000737:chemistry*; D009793:Ochratoxins / Q000032:analysis*; D011145:Polyvinyls / Q000737:chemistry*; D011759:Pyrrolidines / Q000737:chemistry*
chemical_list: D052157:Aptamers, Nucleotide; D009793:Ochratoxins; D011145:Polyvinyls; D011759:Pyrrolidines; C505150:poly(N-vinylpyrrolidine); C025589:ochratoxin A; D006108:Graphite