SU1449902A1 - Method of determining the acidic number of oil in seeds of oil-bearing plants - Google Patents

Abstract

The invention relates to methods for determining the acid number of seed oil, in particular sunflower seeds. The goal is to accelerate the determination and increase its accuracy. The oil is extracted from whole tems and oilseeds by compression, the acid number is determined directly by potentiometric titration of the free fatty acids contained in the oil dissolved in an ethyl ethyl mixture. alcohol and acetone in the ratio from 50-20 to 80-50% vol. The method provides a reduction in time of 3.3 times, while the norpeojHocTb determination is less than 3%. 1 z.p „f-ly, 1 tab. (L with

Description

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This invention relates to methods for: determining the acid number of an oil. ; seed crops, mainly sunflower seeds, and is intended for use in laboratory practice in the food industry and agriculture for testing and quality control of oilseeds

The purpose of the invention is to reduce the time to determine the acid number of oil of oil-bearing crops and to increase the accuracy of the analysis.

The method is carried out as follows.

Analyzed sunflower seeds (90-100 g) are trashed into the device

K, h, oils 2.65 mg KOH n times repeated, with a standard deviation of 0.03 and a relative relative error of 1.5%. Examples 1-6. The process is carried out as described above, using mixtures of ethyl alcohol and acetone in ratios from 50-0% by volume to 100 for pressing the oil. The squeezing device is inserted into the laboratory hydraulic-2050% by volume. The results obtained are a hair press and oil is introduced in the table below.

receiving tank (3-5 g), the use of the proposed Mass Analytical cell allows for a one-time reduction in the use of oil by 3.3 times

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1 g and 10 MP of a mixture consisting of 80% by volume of acetone and 20% by volume of ethyl alcohol. The mixture of organic solvents is preliminarily neutralized; at a pH meter to a pH value of 8.6- | 8.7 with 0.1 N, an aqueous solution of caustic Ikali. The prepared sample is titrated to 10.1 with an aqueous solution of caustic potassium in an automatic titration unit at constant stirring with a reversing magnetic stirrer The amount of the titrant is recorded by a volume meter that has an output (- digital readout meter. When the equivalence point is reached, the titrant supply mechanism automatically | Turns off, read the digital device 99tB) and gives the calculation of the acid value of the (k, h,) oil by the formula

to h - TI V 2l.22SH 45

LoCho 11 X - ----- -.

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the time of determination of k, h, oil of oilseeds by comparison with the known method, while the error of determination is less than 3

With mass analyzes by the proposed method, it is possible to perform up to 20 analyzes per hour, since the extraction of oil from seeds is carried out in parallel with automatic titration and does not require additional time (in a known manner - up to 6 analyzes)

Claims (1)

Formula 1 o A method for determining the acid number of oil in oilseeds, which involves taking a sample, pressing an oil sample from an oil sample and determining the acid number by titration, characterized in that, in order to reduce the time for determining and increasing accuracy, a mixture of alcohol and acetone in the ratio from 50–20% to 80–50% in the oil extracted from the sample and titrated with continuous mixing, P - digital instrument reading: at the end of the titration, which characterizes the amount of alkali, followed by titration; 99 tV; K - 0,00483 - the amount of alkali equivalent to a unit of the scale of the instrument showing (for example, 1 mV), g / mV; constant value, with a calculated mass of KOH in one ml of O, 1 N, solution of caustic potash; 0 mass of oil taken on analysis, g (1.0), K, h, oils 2.65 mg KOH n times repeated, with a standard deviation of 0.03 and a relative error of 1.5%, Examples 1-6. The process is carried out as described above, using mixtures of ethyl alcohol and acetone in ratios from 50-0% by volume to 100,050% by volume. The results are given in the table. soba allows 3.3 times reduction the time of determination of k, h, oil of oilseeds by comparison with the known method, while the determination error is less than 3%, With mass analyzes by the proposed method, it is possible to perform up to 20 analyzes per hour, since the extraction of oil from seeds is carried out in parallel with automatic titration and does not require additional time (in a known manner - up to 6 analyzes). Formula 1 o A method for determining the acid number of an oil in oilseeds, which involves taking a sample, extracting oil from a sample by pressing and determining the acid number by titration, characterized in that, in order to reduce the time to determine and improve accuracy, a mixture of alcohol and acetone is added before titration in the ratio from 50–20% to 80–50% in the oil purified from the sample and titrated with continuous mixing, 2, Method PS n, 1, o tl and h a - i y with the fact that separation of the oil is carried out from the whole grain.