A biosensor enzyme intended for the direct measurement of at least one entry biochemical of the skin, of the membrane of the enzyme associated and method of measurement corresponding

摘要

This biosensor comprises a membrane (8) in which is immobilised an enzyme catalysing the transformation of a substrate involved in cutaneous metabolism, means for detecting and measuring a phenomenon caused by this transformation, representing the concentration of the substrate to be determined brought into contact with the membrane (8) and a measuring cell (13) in which a wall region consists of the membrane (8) and which is capable of being shut off, during the measurement, by a region of cutaneous coating (15), the cell (13) being used in combination with means for circulating therein a liquid for dissolving the substrate to be determined. For the measurement, the biosensor is applied onto the skin, buffer is injected into the cell and once the latter is filled the detection and the measurement are performed and then buffer is again circulated to remove the solubilised substrate. This measurement cycle may be repeated without withdrawing the electrode (1). Application to the determination of cutaneous L-lactate using a Clark electrode in combination with an L- lactate oxydase membrane. IMAGE