title: Fabrication of lactate biosensor based on lactate dehydrogenase immobilized on cerium oxide nanoparticles.
abstract: An electrochemical biosensor was developed to determine lactate that plays an important role in clinical diagnosis, fermentation and food quality analysis. Abnormal concentration of lactate has been related to diseases such as hypoxia, acute heart disorders, lactic acidosis, muscle fatigue and meningitis. Also, lactate concentration in blood helps to evaluate the athletic performance in sports. The main aim of the work is to fabricate NADH/LDH/Nano-CeO2/GCE bio-electrode for sensing lactate in human blood samples. Toward this, CeO2 nanoparticles were synthesized by a hydroxide mediated approach using cerium nitrate hexahydrate (Ce(NO3)3·6H2O) and NaOH as precursors. X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FE-SEM) studies were carried out to determine the structural and morphological characteristics of CeO2 nanoparticles. XRD pattern indicated the formation of highly crystalline CeO2 nanoparticles with face centered cubic structure. The FE-SEM studies revealed the formation of nanospherical particles of size 29.73±2.59 nm. The working electrode was fabricated by immobilizing nicotinamide adenine dinucleotide (NADH) and lactate dehydrogenase (LDH) on GCE surface with CeO2 nanoparticles as an interface. Electrochemical studies were carried out through cyclic voltammetry using a three electrode system with NADH/LDH/NanoCeO2/GCE as a working electrode, Ag/AgCl saturated with 0.1M KCl as a reference electrode and Pt wire as a counter electrode. From the amperometric study, the linearity was found to be in the range of 0.2-2 mM with the response time of less than 4s.
authors.affiliation: Centre for Nanotechnology & Advanced Biomaterials (CeNTAB), SASTRA University, Thanjavur 613 401, Tamil Nadu, India; School of Electrical & Electronics Engineering, SASTRA University, Thanjavur 613 401, Tamil Nadu, India.
authors.forename: Noel
authors.initials: N
authors.lastname: Nesakumar
authors.forename: Swaminathan
authors.initials: S
authors.lastname: Sethuraman
authors.forename: Uma Maheswari
authors.initials: UM
authors.lastname: Krishnan
authors.forename: John Bosco Balaguru
authors.initials: JB
authors.lastname: Rayappan
mesh_terms: D000818:Animals; D015374:Biosensing Techniques; D002563:Cerium / Q000737:chemistry* / Q000378:metabolism; D055664:Electrochemical Techniques; D004800:Enzymes, Immobilized / Q000737:chemistry* / Q000378:metabolism; D007770:L-Lactate Dehydrogenase / Q000737:chemistry* / Q000378:metabolism; D019344:Lactic Acid / Q000032:analysis* / Q000378:metabolism; D053758:Nanoparticles / Q000737:chemistry* / Q000378:metabolism; D010316:Particle Size; D011817:Rabbits; D013499:Surface Properties
chemical_list: D004800:Enzymes, Immobilized; D002563:Cerium; D019344:Lactic Acid; C030583:ceric oxide; D007770:L-Lactate Dehydrogenase
keywords: Biosensor; Ceria nanoparticles; Cyclic voltammetry; Electrochemistry; Lactate