title: Comparative study of the response of membrane electrodes based on calix[6]arene and calix[8]arene derivatives to organic ammonium ions.
abstract: p-tert-Butylcalix[8]arene-octaacetic acid octaethyl ester and calix[8]arene-octaacetic acid octaethyl ester well recognized 2-phenylethylamine and phenylalanine methyl ester compared with the corresponding calix[6]arene derivatives. Moreover, the calix[8]arene derivatives, especially one having tert-butyl groups, gave better selectivity against biologically active amines having a complicated structure, such as norephedrine. We considered the interaction between calixarenes and organic ammonium ions from the viewpoint of molecular symmetries.
authors.affiliation: Faculty of Pharmaceutical Sciences, Okayama University, Okayama 700-8530, Japan. katsu@pharm.okayama-u.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Katsu
authors.forename: Nozomi
authors.initials: N
authors.lastname: Okaki
authors.forename: Kiyoyuki
authors.initials: K
authors.lastname: Watanabe
authors.forename: Kiyoka
authors.initials: K
authors.lastname: Takaishi
authors.forename: Hirochika
authors.initials: H
authors.lastname: Yokosu