title: Oxidative cleavage-based upconversional nanosensor for visual evaluation of antioxidant activity of drugs.
abstract: In this work, we reported a simple and effective upconversional nanoprobe for selective detection of hydroxyl radical (OH) and visual evaluation of OH-scavenging activities of drugs for the first time. The upconversion luminescence from NaYF4:Yb,Er nanoparticles was first quenched by carminic acid (CA) through luminescence resonance energy transfer (LRET) mechanism, and then hydroxyl radical-initiated oxidative cleavage of CA can recover the luminescence by inhibition of LRET. The nanosensors exhibited high selectivity towards other reactive oxygen species and many common metal ions with the detection limit down to 0.21 μM, and displayed a relative standard deviation ranging from 1.17% to 3.13%. More attractively, the nanosensors have efficiently avoided the interference of autofluorescence upon near-infrared excitation, and provided a robust platform to study hydroxyl radical scavenging abilities of several common antioxidants such as tannic acid, ascorbic acid and ferulic acid, and visually evaluate antioxidant activities of five traditional Chinese medicines by luminescent images. This newly developed nanosensor could be further exploited for many applications in pharmaceutical, biomedical and environmental engineering areas.
authors.affiliation: Department of Biomedical Engineering, School of Medical Engineering, Hefei University of Technology, P.O. Box 112, Tunxi road 193, Hefei, Anhui 230009, China.
authors.forename: Qingsong
authors.initials: Q
authors.lastname: Mei
authors.affiliation: Department of Biomedical Engineering, School of Medical Engineering, Hefei University of Technology, P.O. Box 112, Tunxi road 193, Hefei, Anhui 230009, China.
authors.forename: You
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Biomedical Engineering, School of Medical Engineering, Hefei University of Technology, P.O. Box 112, Tunxi road 193, Hefei, Anhui 230009, China. Electronic address: bingoon@ieee.org.
authors.forename: Bing Nan
authors.initials: BN
authors.lastname: Li
authors.affiliation: Department of Biomedical Engineering, Faculty of Engineering, National University of Singapore, Block EA #03-12, 9 Engineering Drive 1, Singapore 117575, Singapore. Electronic address: biezy@nus.edu.sg.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D002329:Carmine / Q000737:chemistry; D004871:Erbium / Q000737:chemistry; D005459:Fluorides / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000032:analysis*; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D015018:Ytterbium / Q000737:chemistry; D015019:Yttrium / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D049408:Luminescent Agents; C525362:sodium yttriumtetrafluoride; D017665:Hydroxyl Radical; D015019:Yttrium; D004871:Erbium; D002329:Carmine; D015018:Ytterbium; D005459:Fluorides
keywords: Antioxidant activity; Carminic acid; Hydroxyl radical; Nanosensor; Upconversion