Food additive retinol palmitate (palmitic acid vitamin A) detection

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A. General regulations

The reagents and water used in this standard, unless otherwise specified, refer to analytical pure reagents and Grade III water specified in GB/T6682-2008. The standard titration solution, impurity determination standard solution, formulation, and product used in the experiment shall be prepared in accordance with the provisions of GB/T601, GB/T602, and GB/T603 unless other requirements are specified. The solution used in the experiment refers to aqueous solution when no specific solvent is specified for preparation

A.2 Identification Test

A.2.1 Solubility Test

Weigh approximately 0.1g of the sample, add 100mL of water, shake evenly, and let stand for 10 minutes. The solution should be colorless

Weigh approximately 0.1g of the sample, add 100mL of cyclohexane, shake evenly, and let stand for 10min. The solution should be colorless

A.2.2 Combustion test

Slowly heat the sample to red, and no open flame is found.

A.3 Determination of drying loss

A.3.1 Instruments and equipment

A.3.1.1 Weighing bottle: Φ 30mm~40mm

A.3.1.2 Constant temperature oven

A.3.2 Analysis Steps

Weigh approximately 2g of the sample, accurate to 0.0001g, and place it in a constant weighing bottle that has been oven dried at 120 ℃± 2 ℃ for 4 hours. Remove the sample and cool it to room temperature in a dryer

A.3.3 Result Calculation

The drying loss is calculated as the mass fraction w1, and the value is expressed in%. Calculate according to formula (A.1):

Where:

m - the value of the mass of the sample before drying, in grams (g)

m1- The numerical value of the mass of the sample after drying, in grams (g)

The experimental results shall be based on the arithmetic mean of the parallel measurement results (to the nearest decimal place). The ratio of the absolute difference between two independent measurement results obtained under repeatability conditions and the arithmetic mean shall not exceed 5%

A.4 Determination of carbon content (on a dry basis)

A.4.1 Instruments and equipment

A.4.1.1 Porcelain crucible: 30mL

A.4.1.2 High temperature electric furnace

A.4.2 Analysis Steps

Weigh approximately 1g of the sample that has been dried at 120 ℃± 2 ℃ for 4 hours, accurate to 0.0001g, and place it in a crucible that has been burned to a constant amount at 625 ℃± 20 ℃.

. Send the crucible into an electric furnace with a temperature not exceeding 300 ℃, open the crucible cover, gradually increase the temperature, and ash to a constant amount at 625 ℃± 20 ℃

A.4.3 Result calculation

The carbon content is calculated in mass fraction w2, and the value is expressed in%. Calculate according to formula (A.2):

Where:

m2- the value of the sample mass (calculated on a dry basis), in grams (g):

m3- the value of the measured sample ash mass, in grams (g)

The experimental results shall be based on the arithmetic mean of the parallel measurement results. The ratio of the absolute difference between two independent measurement results obtained under repeatability conditions and the arithmetic mean shall not exceed 5%

 

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