title: Brominated Graphene as Mimetic Peroxidase for Sulfide Ion Recognition.
abstract: Brominated graphene (GBR) with ∼3% bromine content has shown novel peroxidase mimetic activity toward 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of H2O2.Optimum activity has been observed at pH 4.48 and after a minimum ∼30 min of equilibration time. Among the different analytes studied using the sensor combining TMB, H2O2, and GBR in phosphate buffer of pH 4.48, the S2-ion has effectively shown a short duration of sensing (∼2 min) within the detection range of 0.04-1 mM. A calibration curve for S2-ion estimation has been constructed with the experimental linearity in 0.04-0.4 mM range and having the limit of detection (LOD) value of 25.3 μM. A standard addition experiment has validated the method. A paper strip sensor has been fabricated for successful detection of S2-ion.
authors.affiliation: Department of Chemistry, Institute of Science, Banaras Hindu University , Varanasi 221005, India.
authors.forename: Shikha
authors.initials: S
authors.lastname: Singh
authors.affiliation: Department of Chemistry, Institute of Science, Banaras Hindu University , Varanasi 221005, India.
authors.forename: Kheyanath
authors.initials: K
authors.lastname: Mitra
authors.affiliation: School of Material Science and Technology, Indian Institute of Technology (Banaras Hindu University) , Varanasi 221005, India.
authors.forename: Aparna
authors.initials: A
authors.lastname: Shukla
authors.affiliation: Department of Chemistry, Institute of Science, Banaras Hindu University , Varanasi 221005, India.
authors.forename: Rajshree
authors.initials: R
authors.lastname: Singh
authors.affiliation: Molecular Biology Unit, Institute of Medical Science, Banaras Hindu University , Varanasi 221005, India.
authors.forename: Ravi Kumar
authors.initials: RK
authors.lastname: Gundampati
authors.affiliation: School of Biomedical Engineering, Indian Institute of Technology (Banaras Hindu University) , Varanasi 221005, India.
authors.forename: Nira
authors.initials: N
authors.lastname: Misra
authors.affiliation: School of Material Science and Technology, Indian Institute of Technology (Banaras Hindu University) , Varanasi 221005, India.
authors.forename: Pralay
authors.initials: P
authors.lastname: Maiti
authors.affiliation: Department of Chemistry, Institute of Science, Banaras Hindu University , Varanasi 221005, India.
authors.forename: Biswajit
authors.identifier: 0000-0001-5858-9004
authors.initials: B
authors.lastname: Ray