2.3. Preparation of the biosensor
First of all, a DO probe was covered with a standard teflon membrane using an O-ring and then the membrane which is sensitive for oxygen was pretreated with 0.5% SDS (sodiumdodecylsulphate) in phosphate buffer (50 mM, pH 7.0) to reduce the tension on the membrane surface of the DO probe. After this step, 250 μl of catalase enzyme solution and gelatin were mixed and dissolved at 38 °C for a few minutes. Two-hundred microlitre of the solution was spread over the DO probe membrane surface and allowed to dry at 4 °C for 30 min. At the end of the time, the bioactive layer was treated with glutaraldehyde (2.5%, in phosphate buffer; 50 mM, pH 7.0) for 3 min to form chemical covalent bonds (Schiff bases) between gelatin, enzyme and glutaraldehyde molecules for the immobilisation of the enzyme on the surface of the DO probe.
2.3. Preparation of the biosensor
First of all, a DO probe was covered with a standard teflon membrane using an O-ring and then the membrane which is sensitive for oxygen was pretreated with 0.5% SDS (sodiumdodecylsulphate) in phosphate buffer (50 mM, pH 7.0) to reduce the tension on the membrane surface of the DO probe. After this step, 250 μl of catalase enzyme solution and gelatin were mixed and dissolved at 38 °C for a few minutes. Two-hundred microlitre of the solution was spread over the DO probe membrane surface and allowed to dry at 4 °C for 30 min. At the end of the time, the bioactive layer was treated with glutaraldehyde (2.5%, in phosphate buffer; 50 mM, pH 7.0) for 3 min to form chemical covalent bonds (Schiff bases) between gelatin, enzyme and glutaraldehyde molecules for the immobilisation of the enzyme on the surface of the DO probe.
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