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dc.contributor.authorCan, Kader
dc.contributor.authorApak, Resat
dc.contributor.authorUzer, Aysem
dc.date.accessioned2021-03-06T09:38:35Z
dc.date.available2021-03-06T09:38:35Z
dc.date.issued2020
dc.identifier.citationCan K., Uzer A., Apak R., "A manganese oxide (MnOx)-Based colorimetric nanosensor for indirect measurement of lipophilic and hydrophilic antioxidant capacity", ANALYTICAL METHODS, cilt.12, ss.448-455, 2020
dc.identifier.issn1759-9660
dc.identifier.otherav_e672ec25-c545-4e57-aa5c-ea5a040be679
dc.identifier.othervv_1032021
dc.identifier.urihttp://hdl.handle.net/20.500.12627/151598
dc.identifier.urihttps://doi.org/10.1039/c9ay02027f
dc.description.abstractNanomaterials and composites containing metal oxides are increasingly being used in human health, cosmetics and food packaging applications, which may give rise to the evolution of reactive species on nanosurfaces by autoxidation with air O-2. In recent years, novel analytical approaches have been developed for total antioxidant capacity (TAC) determination, with special emphasis on nanoparticle-based sensors due to their low cost, easy use, rapid response and high precision. A nano-manganese oxide (nano-MnOx)-based spectrophotometric method was developed for the indirect capacity measurement of antioxidant compounds, based on the measurement of the decrease in the color intensity (at lambda(max) = 650 nm) of 3,3 ',5,5 '-tetramethylbenzidine cations (TMB+) in the presence of hydrophilic and lipophilic antioxidants. TMB+ cations were obtained via a redox reaction between MnOx NPs and the TMB chromophore in open air, and antioxidants caused a decrease of TMB+ color intensity. MnOx NPs could be easily and rapidly prepared at low cost. The linearity, repeatability and recovery parameters defining reliability and precision were tested to validate the sensing method. Depending on the type of tested antioxidant, the limit of detection (LOD) values were in the range of 1.23 x 10(-9) to 1.71 x 10(-7) mol L-1. The developed nanoprobe was applied to ternary synthetic mixtures of antioxidants to yield expected and found TAC values (as trolox-equivalents) in agreement. The potential interferents such as benzoic acid, citric acid, glucose and mannitol did not adversely affect the TAC determination. To test real samples, the method of standard addition of pure antioxidant compounds was applied to real samples such as green tea and orange juice.
dc.language.isoeng
dc.subjectZiraat
dc.subjectGıda Mühendisliği
dc.subjectAnalitik Kimya
dc.subjectFizikokimya
dc.subjectSpektroskopi
dc.subjectTemel Bilimler
dc.subjectMühendislik ve Teknoloji
dc.subjectSPEKTROSKOPİ
dc.subjectTarımsal Bilimler
dc.subjectTarım ve Çevre Bilimleri (AGE)
dc.subjectTarım Bilimleri
dc.subjectGIDA BİLİMİ VE TEKNOLOJİSİ
dc.subjectTemel Bilimler (SCI)
dc.subjectKimya
dc.subjectKİMYA, ANALİTİK
dc.titleA manganese oxide (MnOx)-Based colorimetric nanosensor for indirect measurement of lipophilic and hydrophilic antioxidant capacity
dc.typeMakale
dc.relation.journalANALYTICAL METHODS
dc.contributor.departmentİstanbul Üniversitesi-Cerrahpaşa , ,
dc.identifier.volume12
dc.identifier.issue4
dc.identifier.startpage448
dc.identifier.endpage455
dc.contributor.firstauthorID2276014


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