title: Development of electrochemical folic acid sensor based on hydroxyapatite nanoparticles.
abstract: We report the synthesis of hydroxyapatite (HA) nanoparticles (NPs) by a simple microwave irradiation method and its application as sensing element for the precise determination of folic acid (FA) by electrochemical method. The structure and composition of the HA NPs characterized using XRD, FTIR, Raman and XPS. SEM and EDX studies confirmed the formation of elongated spherical shaped HA NPs with an average particle size of about 34 nm. The HA NPs thin film on glassy carbon electrode (GCE) were deposited by drop casting method. Electrocatalytic behavior of FA in the physiological pH 7.0 was investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry. The fabricated HA/GCE exhibited a linear calibration plot over a wide FA concentration ranging from 1.0×10(-7) to 3.5×10(-4) M with the detection limit of 75 nM. In addition, the HA NPs modified GCE showed good selectivity toward the determination of FA even in the presence of a 100-fold excess of ascorbic acid (AA) and 1000-fold excess of other common interferents. The fabricated biosensor exhibits good sensitivity and stability, and was successfully applied for the determination of FA in pharmaceutical samples.
authors.affiliation: Department of Bioelectronics and Biosensors, Alagappa University, Karaikudi 630003, Tamil Nadu, India.
authors.forename: P
authors.initials: P
authors.lastname: Kanchana
authors.affiliation: Department of Bioelectronics and Biosensors, Alagappa University, Karaikudi 630003, Tamil Nadu, India. Electronic address: Sekar2025@gmail.com.
authors.forename: C
authors.initials: C
authors.lastname: Sekar
mesh_terms: D017886:Durapatite / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000379:methods*; D005492:Folic Acid / Q000032:analysis*; D057230:Limit of Detection; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D004364:Pharmaceutical Preparations / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D004364:Pharmaceutical Preparations; D017886:Durapatite; D005492:Folic Acid
keywords: Biosensor; Folic acid; Hydroxyapatite; Nanoparticles; Raman spectroscopy