GB 1886.112-2015National Food Safety Standard -- Food Additives -- Polyoxyethylene xylitol monostearate (English PDF)

3.1 Sensory requirements

Sensory requirements shall comply with the requirements of Table 1.

Table 1 Sensory requirements

Project requires test methods Amber color State semi-gelatinous, oily liquid Take the right amount of sample is placed within the white porcelain plate, under natural light, Observe its color and status

3.2 Physical and Chemical Indicators

Physical and chemical indicators should be consistent with the provisions of Table 2.

Table 2. Physical and chemical indicators

Item Index Test Method Acid value (in dollars KOH)/(mg/g) <= 2 Appendix A A.3 Saponification value (in dollars KOH)/(mg/g) 50 ~ 60 in Appendix A A.4 TABLE 2 (cont.) Item Index Test Method A hydroxyl value (KOH meter)/(mg/g) 80 ~ 100 Appendix A A.5 Heavy metals (Pb)/(mg/kg) <= 10.0 GB 5009.74 Total arsenic (As)/(mg/kg) <= 2.0 GB 5009.76 Nickel (Ni)/(mg/kg) <= 3.0 GB 5009.138 Appendix A Testing method A.1 General Provisions this standard reagents and water, did not indicate when the other requirements, refer to analytical reagent and third grade water GB/T 6682 regulations.

Used in the test standard titration solution, titration impurity standard solution, preparations and products, did not indicate when the other requirements, according to GB/T 601, GB/T 602, the provisions of GB/T 603 formulation. Solution was used in the tests did not indicate what is formulated with solvent, it refers to an aqueous solution.

A.2 Identification Test A.2.1 Reagents and materials A.2.1.1 sodium hydroxide solution. 5%.

A.2.1.2 hydrochloric acid solution. 2mol/L.

A.2.2 Analysis step

A.2.2.1 Method 1. Take a sample 5mL sodium hydroxide solution 5mL, after boiling a few minutes to cool slightly, add hydrochloric acid solution 2mL, get cream Colored liquid.

A.2.2.2 Method 2. Take a sample volume of 60, 40 volumes of water, mixed at 25 °C as a gum.

A.3 acid value (in dollars KOH) Determination A.3.1 Method summary the acid value is the number of milligrams of sample required for neutralizing 1g of potassium hydroxide.

A.3.2 Reagents and materials A.3.2.1 Potassium hydroxide standard titration solution. c (KOH) = 0.05mol/L.

A.3.2.2 phenolphthalein indicator solution. 1% ethanol solution.

A.3.2.3 ethanol.

A.3.3 Analysis step

Weigh the sample 0.5g (accurate to 0.01g), placed in 100mL conical flask, adding ethanol 25mL, heating dissolved, add phenolphthalein Indicator solution 2 drops of potassium hydroxide standard titration solution titration to pink stopper. Make a blank test simultaneously.

A.3.4 Calculation Results Acid value (in dollars KOH) w1, in milligrams per gram (mg/g), according to formula (A.1) Calculated.

(V0-V1) × c1 × M

Where.

Sample volume V0 --- consume potassium hydroxide standard titration solution, in milliliters (mL);

V1 --- blank test consumption volume of potassium hydroxide standard titration solution, in milliliters (mL);

C1 --- concentration of potassium hydroxide standard titration solution, expressed in moles per liter (mol/L);

--- The M molar mass of potassium hydroxide in grams per mole (g/mol), [M (KOH) = 56.10];

m1 --- sample mass, in grams (g).

The results parallel arithmetic mean of the measurement results shall prevail.

A.4 saponification value (KOH meter) measurement A.4.1 Method summary Saponification value is the number of milligrams of potassium hydroxide saponification 1g sample required.

A.4.2 Reagents and materials A.4.2.1 potassium hydroxide ethanol solution. 0.5mol/L.

A.4.2.2 hydrochloric acid standard titration solution. c (HCl) = 0.5mol/L.

A.4.2.3 phenolphthalein indicator solution. 1% ethanol solution.

A.4.3 Analysis step

Weigh the sample 1.5g, accurate to 0.001 g of, a reflux condenser, placed in 250mL Erlenmeyer flask, with a pipette added potassium acetate Alcohol solution 25mL, installed reflux condenser, placed in 80 °C ± 0.1 °C water bath reflux 30min, stop heating, from the condenser catchy Adding ethanol 20mL, remove the Erlenmeyer flask, add 2 drops of phenolphthalein indicator solution, titration with hydrochloric acid standard solution titration to pink just faded.

Number of milliliters of hydrochloric acid standard titration solution consumption records. At the same time a blank test.

A.4.4 Calculation Results Saponification value (in dollars KOH) w2, in milligrams per gram (mg/g), according to equation (A.2) Calculated.

(V2-V3) × c2 × M

Where.

Volume V2 --- blank consumption hydrochloric acid standard titration solution, in milliliters (mL);

V3 --- sample consumption hydrochloric acid standard titrant volume in milliliters (mL);

c2 --- hydrochloric acid standard titration solution concentration, in units of moles per liter (mol/L);

--- The M molar mass of potassium hydroxide in grams per mole (g/mol), [M (KOH) = 56.10];

m2 --- sample mass, in grams (g).

The results parallel arithmetic mean of the measurement results shall prevail.

A.5 hydroxyl value (KOH meter) measurement A.5.1 Method summary the hydroxyl value refers to the time required for the sample 1g acetylated acetic acid, the equivalent number of milligrams of potassium hydroxide.

A.5.2 Reagents and materials A.5.2.1 acetic anhydride - pyridine solution. 15. Using now.

A.5.2.2 Potassium hydroxide standard titration solution. c (KOH) = 0.5mol/L.

A.5.2.3 phenolphthalein indicator solution. 1% ethanol solution.

A.5.3 Analysis step

Accurate sampling 1g ~ 2g, set conical flask with a reflux condenser, with a pipette accurately added acetic anhydride - pyridine solution 5mL, set in a water bath of 90 °C ~ 100 °C refluxed 60min, 20mL of distilled water for the condenser catchy added, removed after cooling, add phenolphthalein indicator 3 drops of potassium hydroxide standard titration solution was titrated to pink up, while doing the blank test.

A.5.4 Calculation Results Hydroxyl value (KOH dollars) w3, in milligrams per gram (mg/g), according to equation (A.3) Calculated.

(V4-V5) × c3 × M

Where.

V4 --- blank consumption volume of potassium hydroxide standard titration solution, in milliliters (mL);

Volume V5 --- sample consumption of potassium hydroxide standard titration solution, in milliliters (mL);

C3 --- concentration of potassium hydroxide standard titration solution, expressed in moles per liter (mol/L);

--- The M molar mass of potassium hydroxide in grams per mole (g/mol), [M (KOH) = 56.10];

m3 --- sample mass, in grams (g).

The results parallel arithmetic mean of the measurement results shall prevail.