h16 at a concentration of 0 5 u03bcmol dm u2212 3 the structure of h16 is shown below the results for hmde are represented by the dark lines in fig2 a and 23b and the electrode of the invention are represented by the dark lines in fig2 c and d respectively for the purposes of comparison these figures also incorporate the results obtained in example 9 in this case the electrode of the invention shows a far greater response than that seen with the hmde thus indicating greater sensitivity of the former than the latter example 12 was repeated but using 5 u03bcmol dm u2212 3 of h16 the results for hmde are represented by the dark lines in fig2 a and b and the electrode of the invention are represented by the dark lines in fig2 c and d respectively for the purposes of comparison these figures also incorporate the results obtained in example 9 fig2 a and b demonstrate a large response to the test compound that is easily visible on both electrodes with the electrode of the invention still showing the slightly larger response following the procedure of example 9 pt hg composite electrodes produced in accordance with the procedure of example 3 and provided individually with monolayers of dopc dope and dops were evaluated the results are shown in fig2 a c which show the results for dopc dope and dops respectively note the difference in vertical scale for dops compared to the other two lipids shown the results show that monolayers of all three types of phospholipid can be formed on the electrodes and that each produces a different characteristic trace in the ac voltammetry experiments the procedure of.