Laktatoksidaz enzimi (LOx), Fe3O4 nanopartiküller ve Prusya mavisi (PB) ile modifiye edilmiş karbon pasta elektrot laktik asit tayini için amperometrik biyosensör olarak araştırıldı. LOx karbon pasta matrikse glutaraldehit (GA) ve sığır serum albümin (BSA) kullanılarak çapraz bağlama immobilize edildi. Yalın ve modifiye edilmiş karbon pasta elektrotların elektron transfer özellikleri elektrokimyasal empedans spektroskopisi (EIS) ve dönüşümlü voltametri (DV) kullanılarak incelendi. Enzim elektrodun analitik performansını etkileyen parametreler detaylı olarak incelendi ve optimize edildi. Laktik aside optimum cevap 0.05 M pH 5.5 fosfat tamponu içinde Ag/AgCl elektroda karşı +0.10 V’da elde edildi. Biyosensör laktik aside 7.5×10-6 −1.3×10-4 M aralığında, 5.9×10-7 M gözlenebilme sınırı ve 0.998 korelasyon katsayısı ile doğrusal cevap gösterdi. Bozucu türlerin etkisi, biyosensörün çalışma ve depolama kararlılıkları da değerlendirildi. Biyosensör +4°C de saklandığında 1 hafta sonra başlangıç aktivitesinin %5.4’ünü kaybetti.
Carbon paste electrode modified with lactate oxidase (LOx) enzyme, Fe3O4 nanoparticles and Prussian blue (PB) was investigated as amperometric biosensor for lactic acid. LOx was immobilized by cross-linking with glutaraldehyde (GA) and bovine serum albumin (BSA) into carbon paste matrix. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) were used to investigate the electron transfer properties of bare and modified carbon paste electrodes. The parameters affecting the analytical performance of the enzyme electrode have been investigated in detail and optimized. The optimum response to lactic acid was obtained in 0.05 M phosphate buffer at pH 5.5 when polarized at +0.10 V vs. Ag/AgCl. The biosensor provides a linear response for lactic acid in the concentration range of 7.5×10-6-1.3×10-4 M with a detection limit of 5.9×10-7 M and correlation coefficient of 0.998. The effects of interferents, the operational and storage stabilities of the biosensor were also evaluated. The biosensor showed 5.4% loss in its initial activity after one week when stored at +4°C.
Other ID | JA57VT24GK |
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Journal Section | Research Articles |
Authors | |
Publication Date | June 1, 2016 |
Submission Date | June 1, 2016 |
Published in Issue | Year 2016 Volume: 42 Issue: 1 |
Journal Owner: On behalf of Selçuk University Faculty of Science, Rector Prof. Dr. Hüseyin YILMAZ
Selcuk University Journal of Science Faculty accepts articles in Turkish and English with original results in basic sciences and other applied sciences. The journal may also include compilations containing current innovations.
It was first published in 1981 as "S.Ü. Fen-Edebiyat Fakültesi Dergisi" and was published under this name until 1984 (Number 1-4).
In 1984, its name was changed to "S.Ü. Fen-Edeb. Fak. Fen Dergisi" and it was published under this name as of the 5th issue.
When the Faculty of Letters and Sciences was separated into the Faculty of Science and the Faculty of Letters with the decision of the Council of Ministers numbered 2008/4344 published in the Official Gazette dated 3 December 2008 and numbered 27073, it has been published as "Selcuk University Journal of Science Faculty" since 2009.
It has been scanned in DergiPark since 2016.
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