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Optimisation of the Composition of a Screen-Printed Acrylate Polymer Enzyme Layer With Respect to an Improved Selectivity and Stability of Enzyme Electrodes

Optimisation of the Composition of a Screen-Printed Acrylate Polymer Enzyme Layer With Respect to an Improved Selectivity and Stability of Enzyme Electrodes

G A M Mersal, M Khodari, U Bilitewski

Biosens Bioelectron. 2004 Sep 15;20(2):305-14.

PMID: 15308235

Abstract:

Glucose oxidase (GOD) was immobilized on screen-printed platinum electrodes by entrapment in a screen printable paste polymerized by irradiation with UV-light. The influences of different additives, in particular polymers and graphite, on the sensitivity and stability of the sensor and the permeability of the enzyme layer for a possible electrochemical interferent were investigated. The chosen additives were Gafquat 755N, poly-L-lysine, bovine serum albumin (BSA), sodium dodecylsulfate (SDS), polyethylene glycol (PEG), Nafion and graphite. All additives led to increases of glucose signals, i.e. improved the sensitivity of glucose detection with Gafquat 755N, poly-L-lysine, SDS and graphite showing the strongest influences with increases by a factor 4, 6.5, 5 and 10, respectively. Ascorbic acid was used as a model interferent showing the influence of the enzyme layer composition on the selectivity of the sensor. The addition of Gafquat 755N or poly-L-lysine led to higher signals not only for glucose, but also for ascorbic acid. SDS addition already reduced the influence of ascorbic acid, which was almost completely eliminated when Nafion (5%) and PEG (10%) were added. A comparable beneficial effect on the selectivity of the sensors was also observed for the addition of 0.5% graphite. Thus, the enzyme electrodes with PEG, Nafion or graphite as additives in the enzyme layer were applied to glucose determinations in food samples and samples obtained from E. coli cultivations.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS71409	Platinum paste, screen printable			Price

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