Film responsive to bicarbonate ion
AssigneeTokuyama Corporation
InventorsHiroaki Taira, Kazuya Ibaragi, Hiromasa Yamamoto, Hiroyuki Yanagi
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Abstract
A memberane sensitive to anions is obtained by forming into a membrane either a composition comprising an onium salt compound such as trioctylmethylammonium chloride or tetraoctylammonium bromide, and an aromatic boric diester compound such as (p-alkyloxy)phenyl borate, or a composition which comprises these two ingredients and a membrane-forming polymer such as polyvinyl chloride or polystyrene, and may further contain a fat-soluble anion salt such as tetraphenyl borate. This membrane can yield an ion-selective electrode which permits hydrogencarbonate ions contained in body fluids to be rapidly determined with high sensitivity and high selectivity and which has a long life.
Claims22
A membrane sensitive to bicarbonate ion comprising a polymer membrane which contains an onium salt structural unit (A) and an aromatic boric diester structural unit (B) of the formula
- wherein Ar is an aromatic carbocyclic group which may optionally have one or more substituents, either in the form of low-molecular-weight compounds dispersed in the polymer or in a form introduced into a polymer molecule.
The composition sensitive to bicarbonate ion comprising an onium salt compound and an aromatic boric diester compound.
An aromatic boric diester compound represented by the following formula (23), (24) or (25):
- which at least one of L1 to L5 is a branched or straight-chain alkyl group of 1 to 72 carbon atoms that may have —O—, —CO—, —COO—, —CONH—, —CON< or —N═CH—, and the others are hydrogen atoms;
- L6 is a group containing a quarternary ammonium salt group;
- L7 is a divalent organic group of 1 to 8 carbon atoms;
- L8 is a hydrogen atom or an alkyl group of 1 to 3 carbon atoms;
- m is 0 or 1;
- and 0<x<1.
Dependencies are inferred from the claim text.