METHOD OF DETERMINATION OF THE VAPORS OF THE ACETIC ALDEHYDE IN THE AROMA OF THE CURD WHEY Russian patent published in 2008 - IPC G01N27/12 

FIELD: dairy industry; other industries; methods and devices of determination of the acetic aldehyde vapors in the aroma of the curd whey.

SUBSTANCE: the invention presents the method of determination of the acetic aldehyde vapors in the aroma of the curd whey, which includes the sampling, preparation of the detecting device for operation, the sampling introduction in the cell of detection, registration of the analytical signal and determination of the concentration of the acetic aldehyde in compliance with the calibration chart. The analyzable sampling is introduced into the cell of determination, which has the piezoelectric quartz resonator, which electrodes are preliminary modified by deposition on them of the solution of the sorbent of polyvinylpirrolidone(PVP)in the acetone so, that the mass of the film after removal of the solvent in the drying cabinet during 30 minutes at the temperature of 40°С has made 17-25 mkg. Registration of the analytical signal is exercised after introduction of the sample in the cell of determination in the form of the response of the modified electrodes of the piezoelectric quartz resonator calculated on the difference of the frequencies of its oscillations before the sample introduction and after achievement of the balance in the sorption system with the introduced sample. The concentration of the acetic aldehyde is calculated in compliance with the calibration chart of dependence of the response of the modified electrodes of the piezoelectric quartz resonator on the concentration of the acetic aldehyde by the equation ΔF=5.1·c, where ΔF is the response of the modified electrodes of the piezoelectric quartz resonator, Hz; "c" is the concentration of the acetic aldehyde, mg/m³. The invention allows: to detect the vapors of the acetic aldehyde in the aroma of the curd whey without usage of the expensive and complex equipment, which should be operated by the highly qualified personnel, to reduce duration of the analysis from 90 to 30 minutes.

EFFECT: the invention allows to detect the vapors of the acetic aldehyde in the aroma of the curd whey without usage of the expensive and complex equipment requiring the highly qualified personnel, to decrease the duration of the analysis from 90 to 30 minutes.

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