USE OF SURFACTANT-MODIFIED CELLULOSE-ACETATE FOR A HIGH-LINEARITY ANDPH-RESISTANT GLUCOSE ELECTRODE

Cellulose acetate modified by incorporation of the surfactant Tween-80 is used as an outer membrane in a glucose oxidase based enzyme electr ode, The membrane acts as a glucose diffusion restricting barrier, all owing extension of response linearity to 0.4 mol l(-1), with sensitivi ty of 2.5 nA 1 mmol(-1). Response times of < 100 s can be achieved by use of initial slope (I/t) measurements, The membrane also provides pr otection for the enzyme from low pH deactivation for at least 10 min, allowing for re-use in low-pH samples such as citrus fruit.