RU1837224C - Method for assessment of content of extract in wine or wine base - Google Patents

Abstract

The invention relates to the food industry and can be used to control the content of the reduced extract and alcohol in wine and wine materials. In the selected sample of the test material, the density and refractive index are measured in native form, and the contents of the reduced extract and alcohol are determined in accordance with the established calculation formulas. 3 tab.

Description

; The invention relates to the food industry and can be used to control the content of the reduced extract and alcohol in wine and wine materials. The aim of the invention is to shorten the determination time, as well as to increase functionality by determining the alcohol content.

To implement this method in

collected sample of the studied material

the native form measures the density and refractive index, and the content

the extract and alcohol found

formulas.

To derive the calculation formulas by which the content of the grafted extract and alcohol are determined, the following dependencies were used:

 Ad «C3 + UbSp. (1)

Sn at Ce + g) Csp, (2) where CSP is the alcohol content, vol.%:

Се - content of the reduced extract, g / 100 cm3

Ad dzo ° -1.0000 - the difference between the density values of the test sample in native form and water at 20 °;

any - changes in the density and readings of the refractometer, respectively, with a change in the concentration of the aqueous solution of the extract by 1 g / 100 cm3;

fiwrj — changes in the density, respectively, and the refractometer reading with a change in the alcohol concentration in the distillate by 1 vol%;

Cp is the refractive index of the test sample in natian form (on a sugar scale).

By a joint solution of equations (1) and (2) with respect to Csp and Ce, we obtain the desired calculation formulas (3) and (4):

O) x Yu KE

SSP and SESP -

and Wed - at Ds1 aP-RU

ABOUT)

Se

 n Ad -ft Cp a-ri-p-y

(4)

The coefficients a, ft, are calculated from tabular data taken from literary sources. The numerical values of these coefficients are equal to the change in the density value and the refractometer reading when the concentration of the aqueous solution of the extract is changed by 1 g / 100 cm and when the aqueous solution of alcohol (distillate) is changed by 1 vol.%:

. V ACCP3. U-TGSG

fl D denА Срсп

where Ad3, Aden is the change in the density of aqueous solutions of the extract and alcohol;

LSE, ASSP - change in the content of the reduced extract and alcohol in their aqueous solutions per unit concentration (for alcohol - by 1% vol. And for the reduced extract - by 1 g / 100 cm3);

АСрес, АСрсп0 - change in refractometer reading for aqueous solutions of the given extract and alcohol.

Example 1. A sample (one to three drops) of the Imereti type of wine Tsolikauri is placed in a refractometer, and the refractive index is measured 3 times (on a sugar scale). An average value of 6.35 is obtained. A 100 cm pycnometer takes a sample of the same wine. The density of the sample is measured (dao2 equal to 0.9968 g / 100 cm3. Ad is calculated:

Ad d2020 - 1,000 -0.0032 g / 10 cm3 To calculate the alcohol content according to Table 1 in line 3, we select from columns 5 and 6 the values / AND /, i.e. / -0.001318; 0.372.

The choice of line is justified by the fact that, in dry wines, the alcohol content is in the range of 8-12%. In principle, it is possible to take the values of / 3 and g from any line, however, the calculation process is delayed, since it is necessary to re-calculate to accurately determine the necessary parameters, since the first calculation with randomly selected values (from any line) as a result will indicate the limits alcoholism, i.e. the line by which you should choose the exact value of / 3 and c. Such a case is possible if the type of object under study is unknown.

Similarly (based on the fact that the extractivity of dry wines does not exceed 6%), in line 2 from columns 4 and 5 of Table 2 we choose: and 0.00383 and 0.983.

According to the calculation formulas (3) and (4), the desired values of Csp 10.11% and Ce 2.56% are calculated.

PRI me R 2. The alcohol content and the extract in different wine materials, determined using known methods, as well as in accordance with the proposed method, carried out as described in example 1, are summarized in table.Z.

This method allows to speed up the process of determining the alcohol and the extract by 20-30 times, to reduce the consumption of wine material for analysis, since it eliminates the need for distillation of alcohol from a relatively large sample volume.

Claims (1)

The claims A method for determining the content of the given extract in wine and wine materials, including sampling and measuring its density in native form, and only so that, in order to reduce time, as well as expand the functionality - by determining the alcohol content, the refractive index is measured in the native sample, and the content of the reduced extract and alcohol is determined by the formulas Mr. Cn a-ij-p-y g - fi Ср + Ad С, -а-ч-р-у  where Csp is the alcohol content, vol.%; Ce — content of the reduced extract, g / 100 cm3; Ad is the difference between the densities of the sample in native form and water at 20 °; a and y are changes in the density and refractometer reading, respectively, with a change in the concentration of the aqueous solution of the extract by 1 g / 100 cm3; P vet — changes in the density and refractometer reading, respectively, with a change in the alcohol concentration in the distillate by 1 vol.%; Cp is the refractive index of the test sample in native form. Table 1 table 2 The content of alcohol and extract in different wine materials, certain known and proposed methods Table 3