Food additive Arabic gum testing

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A. 1 General regulations

Unless otherwise specified in this standard, the purity of the reagents used should be above analytical purity. The standard titration solution used, the standard solution for impurity determination, the formulation, and the product should be prepared in accordance with the provisions of GB/T601, GB/T602, and GB/T603. The experimental water should comply with the provisions of Grade III water in GB/T6682-2008. 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

1g of sample can be dissolved in 2mL of water; Insoluble in ethanol

A.2.2 Polarity

Weigh 1g of the sample (calculated on a dry basis), dissolve it in 100mL of water, let it stand and defoaming, this is the sample solution. Using a 200mm optical rotation tube, measure the specific rotation of the sample solution according to the method in GB/T613. The sample solution from the acacia tree should be left-handed, and the sample solution from the acacia tree should be right-handed

A.3 Determination of acid insoluble ash

A.3.1 Reagents and materials

Hydrochloric acid solution: 10%

A.3.2 Analysis Steps

Measure 25mL of hydrochloric acid solution, add it to the ash obtained during ash determination, and boil for 5 minutes.

. Filter with a filter crucible or ash free filter paper, wash the filter residue several times with hot water, and burn it to constant weight at 800 ℃± 25 ℃

A.3.3 Result Calculation

The mass fraction w1 of acid insoluble ash is calculated according to formula (A.1):

Where:

m1- the mass of residue after ignition, in grams (g)

m0- Mass of the sample, in grams (g)

A.4 Determination of acid insoluble matter

A.4.1 Reagents and materials

Hydrochloric acid solution: 10%

A.4.2 Instruments and Equipment

A.4.2.1 Filter crucible (dried at 105 ℃± 2 ℃ for 3 hours)

A.4.2.2 Drier

A.4.3 Analysis Steps

Weigh 5g of the sample to the nearest 0.001g, place it in a 250mL conical flask containing approximately 100mL of water, dissolve it, add 10mL of hydrochloric acid solution, and slowly boil for 15min. Filter the hot solution with a filter crucible and wash the filter residue several times with hot water. Dry the crucible and filter residue at 105 ℃± 2 ℃ for 3 hours, then cool them in a dryer and weigh them

A.4.4 Result Calculation

Calculate the mass fraction w2 of acid insoluble matter according to formula (A.2):

Where:

m2- the total mass of the crucible and residue after drying, in grams (g)

m1- mass of the crucible, in grams (g)

m - The mass of the sample, in grams (g)

A.5 Determination of starch or dextrin

A.5.1 Reagents and materials

Iodine solution: Weigh 14.0g of iodine, dissolve it in 100mL of aqueous solution containing 36.0g of potassium iodide, add 3 drops of hydrochloric acid, and dilute with water to 1000mL

A.5.2 Analysis Steps

Prepare a 20mg/mL sample solution.

. Take an appropriate amount of sample solution, boil it, cool it, and add a few drops of iodine solution. If there is no blue or red color, it is considered to have passed the test

A.6 Determination of tannic gum

A.6.1 Reagents and materials

Iron chloride solution: Weigh 9g of iron chloride (FeCl3 · 6H2O), dissolve in water, dilute to 100mL, and mix well

A.6.2 Analysis Steps

Prepare a 20mg/mL sample solution.

. Take 10mL of the sample solution and add about 0.1mL of ferric chloride solution. The sample solution remains black or has no black precipitate formation, indicating that the test has passed

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