METHOD OF SIMULTANEOUSLY DETECTING SIZE AND CONCENTRATION OF IONIC MATERIAL

摘要

A method and a device for detecting size and concentration of ionic materials are provided to measure the concentration and the size of the ionic materials at the same time using an FET based bio-sensor. A method for simultaneously detecting size and concentration of ionic materials comprises the steps of: (a) measuring voltage drop values of more than three kinds of ionic materials, each of which size and concentration are known, using FET-based sensors for detecting the ionic materials having more than two different electric characteristics; (b) deciding more than three points in a three-dimensional space consisting of the size, concentration and voltage drop from the known size values and concentration values of the ionic materials and the measured voltage drop values regarding each of the FET based sensors; (c) approximating the more than three points to one plane regarding the each of the FET-based sensors; (d) measuring a voltage drop value of an ionic material, of which size and concentration are unknown, using each of the FET based sensors; (e) determining an isoelectric line existing on the plane using the voltage drop value obtained from the step(d) regarding the each of the FET based sensors; and (f) determining cross-points among more than two isoelectric lines. A device for detecting size and concentration of ionic materials comprises a voltage drop measuring unit(31) which includes FET-based sensors for detecting ionic material having more than two different electrical characteristics; a point determining unit(32) which determines a point in a three-dimensional space consisting of size, concentration and voltage drop from the known size value and concentration value of the ionic materials, and the voltage drop value measured from the voltage drop measuring unit; a plane approximation unit(33) which approximates the determined more than 3 points to one plane; an electric line determining unit(34) which determines an electric line existing on the plane generated by the plane approximation unit; and a cross-point determining unit(35) which determines a cross-point among the determined more than two electric lines.