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GB 1903.30-2022: National food safety standard - Food nutrition enhancer - Polyfructose
GB 1903.30-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard - Food nutrition enhancer -
Polyfructose
ISSUED ON: JUNE 30, 2022
IMPLEMENTED ON: DECEMBER 30, 2022
Issued by: National Health Commission of the People's Republic of China;
State Administration for Market Regulation.
Table of Contents
1 Scope ... 3 
2 Molecular and structural formulas ... 3 
3 Technical requirements ... 3 
Annex A Inspection method Determination of polyfructose (≥DPS), average degree
of polymerization (DP), glucose + fructose + sucrose content... 5 
Annex B Inspection method Determination of fructooligosaccharides (DP3-DP4)
content ... 12 
National food safety standard - Food nutrition enhancer -
Polyfructose
1 Scope
This document specifies food nutrition fortifier polyfructose prepared by using
chrysanthemum or chrysanthemum root as raw material, using acid/alkali treatment or
other methods to remove impurities, and using drying process.
2 Molecular and structural formulas
2.1 Molecular formula
2.2 Structural formula
Polyfructose is a carbohydrate with fructose units linked by β-2,1-bonds and terminated
by glucose units with a total of 5~60 units.
3 Technical requirements
3.1 Sensory requirements
Annex A
Inspection method
Determination of polyfructose (≥DPS), average degree of polymerization (DP),
glucose + fructose + sucrose content
A.1 General provisions
Unless otherwise specified, only the reagents confirmed as analytically pure, and the
grade one water specified in GB/T 6682 are used in the analysis. All solutions used are
aqueous solutions unless otherwise specified.
A.2 Reagents and materials
A.2.1 Acetic acid: 0.2mol/L.
A.2.2 Sodium acetate: 0.2mol/L.
A.2.3 pH 4.5 acetate buffer solution: Mix 28.0mL of 0.2mol/L acetic acid and 22.0mL
of 0.2mol/L sodium acetate. Use water to dilute to 100mL.
A.2.4 Hydrochloric acid solution: 0.05mol/L.
A.2.5 Potassium hydroxide solution: 0.05mol/L.
A.2.6 Amyloglucosidase: For enzymatic hydrolysis of amylase to glucose. The content
of glucose, fructose and sucrose shall be less than 0.02%. Store in a 4°C refrigerator
when not in use.
A.2.7 Fructase: For enzymatic hydrolysis of polyfructose to glucose and fructose. The
content of glucose, fructose and sucrose shall be less than 0.005%. Store in a 4°C
refrigerator when not in use.
A.2.8 Acetonitrile.
A.2.9 Glucose: d (+) anhydrous dextrose.
A.2.10 Fructose: Dextrose.
A.2.11 Sucrose.
A.2.12 Sugar standard stock solution: Weigh 6.00g of the sugar standard product (2.00g
each of glucose, fructose, and sucrose) that has been dried at 96°C ± 2°C for 4 h. Put
into a 50mL beaker. Add water to stir till it is completely dissolved. Transfer it into a
50mL volumetric flask. Set volume constant to the scale. Obtain the sugar standard
stock solution (the glucose content is 40.0mg/mL, the fructose content is 40.0mg/mL,
and the sucrose content is 40.0mg/mL).
A.2.13 Standard working solution: Use water to respectively dilute the sugar standard
stock solution to 10.0mg/mL, 7.00mg/mL, 4.00mg/mL, 2.00mg/mL and 1.00mg/mL
solutions.
A.3 Instruments and equipment
A.3.1 Analytical balance: The resolution is 1mg and 0.01g.
A.3.2 pH meter: The accuracy is ±0.05.
A.3.3 Constant temperature water bath.
A.3.4 High performance liquid chromatograph (with differential refractive index or
equivalent detector).
A.3.5 0.22μm microporous membrane.
A.3.6 Oven.
A.3.7 25mL, 50mL volumetric flasks.
A.3.8 Pipettes (1mL, 5mL, 10mL).
A.4 Analysis steps
A.4.1 Sample weighing
Weigh about 1g of sample (to the nearest of 1mg, as mass m1) that has been dried at
96°C±2°C for 4h. Put it into a 100mL beaker. Add 50mL of boiling water. Moderately
stir. Use potassium hydroxide solution (A.2.5) or hydrochloric acid solution (A.2.4) to
adjust pH to 6.5~8.0. After the sample is completely dissolved, transfer it to a 100mL
volumetric flask. Incubate at 85°C ± 2°C for 10min. Then cool it to room temperature.
Use water to set volume to constant. Shake well. After that, take care to keep the sample
temperature above room temperature. Take a small amount of solution. Filter it through
a 0.22μm filter membrane. Then analyze it (test A0).
A.4.2 Enzymatic hydrolysis 1
Take 60.0mL of sample solution (A.4.1). Add 30.0mL of acetate buffer solution (A.2.3).
Mix well. Use 0.05mol/L hydrochloric acid solution (A.2.4) to adjust pH = 4.5±0.05.
Add a sufficient amount of amyloglucosidase (A.2.6) [if the approximate content of
starch and maltodextrin in the sample cannot be determined, it can be considered that
100% of the unknown part of the sample is starch, so as to calculate the amount of
enzyme]. The sample liquid water bath is heated to 60°C ± 2°C. Maintain at constant
temperature for 30min. Stir moderately but it shall not foam. There shall be no air
bubbles in the solution. After it is cooled to room temperature, transfer it to a 100mL
volumetric flask. Use water to set volume to constant. Take a small amount of solution.
Filter it through a 0.22μm filter membrane. Then analyze it (test A1).
A.4.3 Enzymatic hydrolysis 2
Take 60.0mL of sample solution (A.4.2). Add enough fructase (A.2.7) (if the
polyfructose content cannot be determined, the unknown part of the sample can be
considered to be 100% polyfructose; if using megazyme 2000U/mL mixed fructase, add
100μL). The sample liquid water bath is heated to 60°C ± 2°C. Maintain at constant
temperature for 30min. Stir moderately. Prevent foaming. Prevent air from entering.
After it is cooled to room temperature, transfer it to a 100mL volumetric flask. Use
water to set volume to constant. Filter it through a 0.22μm filter membrane. Then
analyze it (test A2).
A.5 Chromatographic detection
Reference chromatographic conditions: Amino column or equivalent column. The
mobile phase is acetonitrile: water = 75%:25%. The flow rate is 1.0mL/min. The
injection volume is 20μL. The column temperature is 30°C.
Drawing of standard curve: Respectively pipette 20μL of standard working solution
(A.2.13). Inject it into the high-performance liquid chromatography. Determine the
peak height or peak area of the standard solution under the above chromatographic
conditions. Draw a standard curve with the concentration as the abscissa and the peak
height or peak area as the ordinate.
Determination of sugar in sample: Pipette 20μL of sample solution (test A0, A1 and A2).
Inject it into the high-performance liquid chromatography. Determine the peak height
or peak area of the sample under the above chromatographic conditions. Check the
contents of fructose, glucose, and sucrose in the sample solution from the standard
curve. The response values of fructose, glucose and sucrose in the sample solution shall
be within the linear range of the standard curve. If it exceeds the linear range, the
sampling amount shall be changed and re-tested.
A.6 Result calculation
A.6.1 Calculation of the contents of fructose, glucose, and sucrose
The sugar contents corresponding to different tests are shown in Table A.1.
Table A.1 -- Sugar contents corresponding to different tests
Sugar Test A0 Test A1 Test A2
Glucose Gf G1 Gt
Fructose Ff Ft
Sucrose S
A.6.3 Calculation of average degree of polymerization (DP)
The content of glucose and fructose released from polyfructose is calculated according
to formula (A.8) and formula (A.9), respectively.
Where,
Gi - G...