METHOD OF MEASURING HUMIDITY OF STOCK CUBES, DRY BOUILLONS AND SOUP BASES

摘要

FIELD: analytical chemistry.;SUBSTANCE: method includes using static "electronic nose", whose matrix is formed from 2 weight-sensitive piezo-sensors, whose electrodes are modified by even application of film of acetone solutions of polyethylene glycol PEG-2000 and polyvinylpyrrolidone, and subjected to drying. Modified weight-sensitive piezo-sensors are fixed in holders on cover and put in bode of static "electronic nose". Completeness of removal of free solvents from films is controlled by constancy of fluctuations of weight-sensitive piezo-sensors, then sample of stock cube, dry bouillon or soup base is taken, heated, crushed thoroughly and mixed, placed into weighing bottle with polyurethane membrane on cover. Sample is kept in weighing bottle during 10-15 minutes. After saturation of gas phase with water vapours through polyurethane membrane sample of equilibrium gas phase is taken with 3-5 cm³ syringe, which is quickly injected into body of static "electronic nose". Frequency of fluctuations of weight-sensitive piezo-sensors is fixed, total analytic signal is formed in form of kinetic "visual print" and is compared with standards. Area of figure S_"в.а" is calculated and humidity of sample ω % is determined using calibrating diagram drawn in coordinates S_"в.а"=f (ω, wt %).;EFFECT: high expressiveness, reliability, accuracy, objectivity and simplicity of determining.;3 dwg