Arkray, Inc.

Other

Matsushita Electric Industrial Co., Ltd.

Phc Corporation

Kazuo Iketaki

Yoichi Inoue

Katsumi Hamamoto

Shoji Miyazaki

Hiroyuki Tokunaga

Hideyuki Baba

A quantitative analyzing method is provided for electrochemically measuring the concentration of a substance in a sample liquid using a sensor including a reagent layer () which contains a reagent for reacting with the substance and to which () the sample liquid is introduced, and a first electrode () and a second electrode () for applying a voltage to the reagent layer (). The method includes a current measuring step for applying a voltage across the first electrode () and the second electrode () for measuring current flowing between the first and the second electrodes (), a parameter calculating step for calculating a parameter based on the measured current, and a determining step for determining a state of the sample liquid introduced to the reagent layer () based on the parameter and at least one predetermined constant.

Quantitative analyzing method and quantitative analyzer using sensor

A glucose sensor system comprising the steps of using as a sample discriminating parameter a ratio (I/&#x394;I) of a measured current value I to the time-differential value of the current value &#x394;I, defining a discrimination function that discriminates whether a sample is blood or control fluid and uses the discriminating parameter as an independent variable, quantitating as a discriminating index a numeric value obtained by substituting a discriminating parameter value into this discrimination function, and automatically discriminating, based on this index, whether the sample is blood or a control fluid, whereby a kind of the sample can be automatically quantitated by measuring electric current when a sensor system is used for quantitating the concentration of an analysis object in the sample.

Sample discriminating method

A glucose sensor system comprising the steps of using as a sample discriminating parameter a ratio (I/&Dgr;I) of a measured current value I to the time-differential value of the current value &Dgr;I, defining a discrimination function that discriminates whether a sample is blood or control fluid and uses the discriminating parameter as an independent variable, quantitating as a discriminating index a numeric value obtained by substituting a discriminating parameter value into this discrimination function, and automatically discriminating, based on this index, whether the sample is blood or a control fluid, whereby a kind of the sample can be automatically quantitated by measuring electric current when a sensor system is used for quantitating the concentration of an analysis object in the sample.

A predetermined voltage is applied to a biosensor twice to promote an electrochemical reaction, and the following parameters (P and P ) are calculated from the values of detected current. A statistical technique is used with these parameters to compensate for errors so that the concentration of an object can be determined. P : the ratio (If/Ib) of the maximum current (If) or a current occurring the maximum in the first excitation to a current (Ib) read at any point in the second excitation. P : a current (Ib) read at any point in the second excitation.

Growing community of inventors

Otsu, Japan

Kazuo Iketaki