title: A microbial biosensor based on Lactobacillus delbruecki sp. bacterial cells for simultaneous determination of lactic and pyruvic acid.
abstract: The aim of this study was mainly to develop a microbial biosensor for the simultaneous determination of lactic acid and pyruvic acid. In developing biosensor, lyophilised Lactobacillus delbruecki sp. bacterial cells were immobilised with polypyrrole on a platin electrode surface using electropolymerization method. Lactate concentration was determined based on the differences in amperometric responses at cathodic peak (+0.2V) of potassium ferricyanide, whereas pyruvate concentration was determined using the differences at anodic peak (+0.1V). The response of biosensor showed linearity between 0.1 and 1.0mM for both of two substrates. Optimisation studies were carried out for amount of microorganism, pyrrole concentration, pH and temperature. In the characterisation studies, substrate specificity, interference effect of some substances on the biosensor response, and storage stability were established.
authors.affiliation: Department of Biochemistry, Faculty of Science, Ege University, 35100 Bornova-İzmir, Turkey. Electronic address: erhancanbay87@gmail.com.
authors.forename: Erhan
authors.initials: E
authors.lastname: Canbay
authors.affiliation: Department of Biochemistry, Faculty of Science, Ege University, 35100 Bornova-İzmir, Turkey.
authors.forename: Alper
authors.initials: A
authors.lastname: Habip
authors.affiliation: Department of Biochemistry, Faculty of Science, Ege University, 35100 Bornova-İzmir, Turkey.
authors.forename: Goknur
authors.initials: G
authors.lastname: Kara
authors.affiliation: Department of Biochemistry, Faculty of Science, Ege University, 35100 Bornova-İzmir, Turkey.
authors.forename: Zeynep
authors.initials: Z
authors.lastname: Eren
authors.affiliation: Department of Biochemistry, Faculty of Science, Ege University, 35100 Bornova-İzmir, Turkey.
authors.forename: Erol
authors.initials: E
authors.lastname: Akyilmaz
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D018914:Cells, Immobilized / Q000378:metabolism; D019344:Lactic Acid / Q000032:analysis* / Q000378:metabolism; D048668:Lactobacillus delbrueckii / Q000378:metabolism*; D019289:Pyruvic Acid / Q000032:analysis* / Q000378:metabolism; D013696:Temperature
chemical_list: D019344:Lactic Acid; D019289:Pyruvic Acid
keywords: Lactate; Lactobacillus delbruecki sp.; Microbial biosensor; Polypyrrole; Pyruvate