New metformin hydrochloride detection method

Abstract

The present invention provides a new method for determining metformin hydrochloride content by using an ion selective electrode method. According to the present invention, a pCL-1Q9 type chloride ion selective electrode is adopted as a work electrode, a 217 type saturated calomel electrode is adopted as a reference electrode, a stirring rate is 120 rpm / min, a stirring time is 3 min, the pH value is 4-6, a temperature is 18 DEG C, a buffer solvent is a total ionic strength adjustment buffer solution comprising potassium nitrate and sodium citrate, and a standard curve method is adopted as the method for quantitative analysis of the drug metformin hydrochloride effective component content; and compared with the traditional method, the method of the present invention has characteristics of simple experiment equipment, low test cost, simpleness, rapidness, accurate determination result, wide linear range and high sensitivity, and is the easiest and feasible analysis method for determining the metformin hydrochloride content.

Description

technical field [0001] The invention belongs to the technical field of drug analysis, in particular to a potentiometric analysis method for the quantitative analysis of metformin hydrochloride, in particular to a method for determining the content of active ingredients in metformin hydrochloride medicines. Background technique [0002] An ion-selective electrode is an electrode that uses a selective membrane to selectively respond to specific ions to measure or indicate the activity of ions in a solution. The working principle of the ion selective electrode method is as follows: the potential of the indicator electrode (also known as the working electrode, the present invention uses a chloride ion selective electrode) can indicate the change of the measured ion activity (or concentration), and the reference electrode (the present invention uses a saturated The potential of the calomel electrode) is not affected by the change of the test solution composition, and has a relati...

AI Technical Summary

Problems solved by technology

[0004] At present, the methods for determining the amount of metformin hydrochloride are mainly based on high-performance liquid chromatography and ultraviolet spectrophotometry, but these methods require complex processing of samples before determination, and the linear range is not wide, and the requirements for sample processing are also very high. high

In addition, these instruments are expensive, complicated to operate, and the drug analysis process has secondary environmental pollution and high analysis costs.

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