Method for measuring substance and testing piece

A method for measuring an analyte, comprising:

• a step of forming a detectable substance, which is formed by a chemical reaction of the analyte and a reagent and is formed with a quantitative correlation with the analyte, wherein a reaction system which forms the detectable substance contains a substance which decomposes the detectable substance, and the reaction system which forms the detectable substance contains a layered inorganic compound to suppress decomposition of the detectable substance;
• and
• a step of measuring the detectable substance,
• wherein the formation reaction of the detectable substance is an oxidation-reduction reaction and the reaction system including the formation reaction of the detectable substance includes a formation reaction of hydrogen peroxide or an oxidation reaction using hydrogen peroxide as an oxidizing agent.

A method for measuring an analyte, comprising:

• a step of forming a detectable substance, which is formed by a chemical reaction of the analyte and a reagent and is formed with a quantitative correlation with the analyte, wherein a reaction system which forms the detectable substance contains a substance which decomposes the detectable substance, and the reaction system which forms the detectable substance contains a layered inorganic compound to suppress decomposition of the detectable substance;
• and
• a step of measuring the detectable substance,
• wherein the formation reaction of the detectable substance is an oxidation-reduction reaction and the reaction system including the formation reaction of the detectable substance includes the formation reaction of nicotinamide adenine dinucleotide or nicotinamide adenine dinucleotide phosphate or a reaction in which nicotinamide adenine dinucleotide or nicotinamide adenine dinucleotide phosphate acts as a reducing agent.

A method for measuring an analyte, comprising:

• a step of forming a detectable substance, which is formed by a chemical reaction of the analyte and a reagent and is formed with a quantitative correlation with the analyte, wherein a reaction system which forms the detectable substance contains a substance which decomposes the detectable substance, and the reaction system which forms the detectable substance contains a layered inorganic compound to suppress decomposition of the detectable substance;
• and
• a step of measuring the detectable substance,
• wherein the detectable substance is an azo compound detected by an optical method, and the method measures the analyte by determining a quantity of an azo compound having a quantitative correlation with the analyte and formed by a coupling reaction between a diazonium salt formed from the analyte through a chemical reaction and a coupling reagent, wherein decomposition of the azo compound is suppressed by causing the layered inorganic compound to exist in a system of the coupling reaction.