Abstract

Several liquid membrane microelectrodes sensitive to bile acids (two barrel, tip diameter about 0.5 micron) are described. The results of different liquid ion exchangers such as Aliquat 336/decanol, trioctylmethylammonium/decanol, hexadecyltrimethylammonium/decanol, benzyldimethylhexadecylammonium/decanol, hexadecyltributylammonium/5% hexachlorobenzene + 0.5% bromoacetanilide in o-dichlorobenzene are compared with each other, and the better one among them is the mixture of benzyldimethylhexadecylammonium cholate/decanol with hexadecyltributylammonium taurocholate/5% hexachlorobenzene + 0.5% bromoacetanilide in o-dichlorobenzene because of its quicker response time and low drift. The calibration curves, slopes, test limits, selective coefficients, drifts, and response times of the various bile-acids-sensitive microelectrodes in different calibration solutions were demonstrated and compared with each other.

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