GB/T 15108-2017 English PDF (GBT15108-2017)

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GB/T 15108-2017: Raw sugar
GB/T 15108-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 67.180
X 31
Replacing GB/T 15108-2006
Raw sugar
(Codex Stan 212-1999, Codex standard for sugars, NEQ)
ISSUED ON: NOVEMBER 01, 2017
IMPLEMENTED ON: MAY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Requirements ... 5 
4 Test methods ... 6 
5 Inspection rules ... 18 
6 Marks, packaging, transportation, storage ... 22 
Raw sugar
1 Scope
This Standard specifies requirements, test methods, inspection rules and marks,
packaging, transportation, storage for raw sugar.
This Standard is applicable to cane sugar crystals with molasses made from
sugarcane juice after purification, smelting, and honey separation.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 191, Packaging and storage marks
GB/T 6682, Water for analytical laboratory use - Specification and test
methods
GB 7718, National Food Safety Standard - Standard for nutrition labelling of
prepackaged foods
GB/T 10498, Sugarcane
GB 13104, National Food Safety Standard - Sugars
JJF 1070, Rules of Metrological Testing for Net Quantity of Products in
Prepackages with Fixed Content
Measures for the Supervision and Administration of Quantitative Packaging
Commodities Measurement (Order No. 75 of General Administration of
Quality Supervision, Inspection and Quarantine)
3 Requirements
For the purposes of this document, the following terms and definitions apply.
3.1 Raw material requirements
4.2.1.1 Balance: Resolution is 0.1mg.
4.2.1.2 Volumetric flask: (100.00±0.02) mL.
4.2.1.3 Filtration equipment: Glass rod-less funnel, beaker, medium-speed
quantitative filter paper.
4.2.1.4 Sugar tester: It shall have an international sugar content scale.
According to the sugar content °Z scale, the accuracy of the automatic sugar
tester is 0.05°Z. The accuracy of the visual inspection of the sugar meter is
0.1°Z.
NOTE: If using a sugar tester with the old sugar content °S scale, the reading °S needs to
be multiplied by a factor of 0.99971 to convert to °Z.
4.2.1.5 Observation tube: Length is (200.00±0.02) mm.
4.2.2 Reagents
4.2.2.1 Basic lead acetate solution: Weigh 340g of basic lead acetate powder.
Dissolve in about 1000mL of distilled water that has just been boiled. Adjust the
brix to 54.3°Bx. The prepared solution shall prevent contact with carbon dioxide
in the air.
4.2.2.2 Distilled water: Without optically active substances.
4.2.3 Determination steps
4.2.3.1 Calibration of sugar tester
The reading of the sugar tester shall be calibrated with a standard quartz tube.
For sugar tester without quartz wedge compensator, the temperature shall be
measured when reading the optical rotation of the quartz tube, to the nearest of
0.2°C. If this temperature differs from 20°C by more than ±0.2°C, then use
formula (1) to perform temperature correction of the optical rotation of the quartz
tube. Then use the correction value to calibrate the reading of the sugar tester.
Where,
αt - Optical rotation value of the quartz tube at t°C, in international sugar content
(°Z);
α20 - Optical rotation value of the quartz tube at 20°C, in international sugar
content (°Z);
P - Sugar content, %;
Pt - Observed sugar content of raw sugar sample, in international sugar content
(°Z);
t2 - Temperature of the sugar solution when measuring Pt, in Celsius (°C).
4.2.3.4 Allowable error
The difference between the two measured values shall not exceed 0.05% of
the average value.
4.3 Determination of safety factor (SF)
4.3.1 Instruments, equipment
4.3.1.1 Electric heating thermostat: During the measurement, the temperature
at (2.5±0.5) cm above the drying dish shall be maintained at (105±1)°C.
4.3.1.2 Desiccator with thermometer.
4.3.1.3 Weighing bottle: 6cm in diameter and 3cm in height.
4.3.1.4 Balance: Resolution is 0.1mg.
4.3.2 Determination steps
4.3.2.1 Drying
Preheat the drying oven to 105°C. Put the empty weighing bottle together with
the open lid into the drying oven. Dry for at least 30min. Then put the lid on the
weighing bottle and take it out of the drying oven. Put it in a desiccator to cool
to room temperature. Weigh as soon as possible, to the nearest of 0.1mg.
Put (10.0±0.5)g of sample in the weighing bottle as soon as possible (the
thickness of the sugar layer in the weighing bottle shall not exceed 1cm). Cover
with the lid. Weigh, to the nearest of 0.1mg.
Remove the lid and put with the weighing bottle into the drying oven. Dry
accurately at 105°C for 3h. Cover with the lid. Move to the desiccator to cool to
room temperature. Weigh as soon as possible, to the nearest of 0.1mg.
4.3.2.2 Calculation and result presentation
Loss on drying D is calculated according to formula (4). The value is expressed
in%. The calculation result retains two significant digits.
1.300~1.700. The minimum index value of refractive index: 0.0005. The
sucrose mass fraction brix (°Bx) is 0~95. The minimum graduation value: 0.2.
4.5.1.4 pH meter: The graduation value or minimum display value is 0.02.
4.5.1.5 Membrane filter: Use a microporous membrane with a pore size of
0.45μm.
4.5.2 Reagents
4.5.2.1 0.05mol/L sodium hydroxide solution.
4.5.2.2 0.05mol/L hydrochloric acid solution.
4.5.3 Determination steps
Weigh a certain amount of sugar sample. Use distilled water to dissolve (so that
the sugar solution concentration is about 10°Bx). Adjust the pH of the sugar
solution to 7.00±0.02 with sodium hydroxide or hydrochloric acid solution. Pour
into the pre-laid microporous membrane filter. Filter under vacuum. Discard the
first part of the filtrate. Collect not less than 50mL of remaining filtrate. Use Abbe
refractometer to determine the refractive brix of the filtrate. Then use a cuvette
to hold the filtrate. Use filtered distilled water as a reference standard for zero
color value. On a spectrophotometer, use 420nm wavelength to determine its
absorbance.
4.5.4 Calculation and result presentation
The color value Cv is calculated according to formula (7). The calculation result
is kept as an integer.
Where,
Cv - Color value, in international sugar color unit (IU);
A - Absorbance of the sample solution measured at 420nm wavelength;
b - Cuvette thickness, in centimeters (cm);
c - Concentration of sample solution (obtained from table 2 of refractive hammer
corrected to 20°C), in grams per milliliter (g/mL).
4.6.1.1 Crucible glass filter: Pore size is 40μm~80μm.
4.6.1.2 Electric heating thermostat: 125°C~130°C.
4.6.1.3 Desiccator: With thermometer.
4.6.1.4 Balance: Resolution is 1mg.
4.6.2 Reagents
4.6.2.1 1% α-Naphthol in ethanol.
4.6.2.2 Concentrated sulfuric acid: Density is 1.84g/mL.
4.6.3 Determination steps
On the glass filter plate, spread a layer of about 5mm thick glass fiber that has
been washed by dilute hydrochloric acid solution and rinsed by distilled water.
The glass filter is filtered and cleaned with distilled water under reduced
pressure. Then dr...