This standard specifies the definition, requirements, testing methods, packaging, transportation, and storage of sweet buckwheat. This standard applies to the production, acquisition, storage, transportation, processing, and sales of sweet buckwheat. NY/T 1503-2007 Sweet Buckwheat NY/T1503-2007 Standard download decompression password: www.bzxz.net
This standard specifies the definition, requirements, testing methods, packaging, transportation, and storage of sweet buckwheat. This standard applies to the production, acquisition, storage, transportation, processing, and sales of sweet buckwheat.

ICS65.020
Agricultural Industry Standard of the People's Republic of China
NY/T1503—2007
Buckwheat
Published on December 18, 2007
Implemented on March 1, 2008
Ministry of Agriculture of the People's Republic of China
Appendix A of this standard is a normative appendix.
This standard is proposed and managed by the Ministry of Agriculture of the People's Republic of China.
The responsible drafting unit of this standard is: Crop Research Institute of Inner Mongolia Academy of Agricultural Sciences. The main drafters of this standard are: Zhang Fengying, Guo Miguo, Yao Ping, Liu Zhiping, Luo Wang, Liu Haoming, Huang Jie. This standard is published for the first time.
NY/T 1503--2007
1 Scope
This standard specifies the definition, requirements, test methods, packaging, transportation and storage of sweet potato. This standard applies to the production, purchase, storage, transportation, processing and sale of sweet buckwheat. 2 Normative references
NY/T 1503—2007
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document: its latest version applies to this standard. GB 10458 Buckwheat
CB 5490 General Standard for Inspection of Cereals, Oils and Vegetable Fats
GB5191 Inspection of Cereals and Oils--Sampling and Subsampling MethodsGB/1,5497 Inspection of Cereals and Oils--Determination of Moisture ContentGB/T551 Inspection of Cereals and Oils--Determination of Crude Protein
GB 8815-87
Sack Standard
GB 8665—88
3 Terms and Definitions
Flour Bag Standard
The following terms and definitions apply to this standard. 3.1
Sweet buckwheat
Common buckwheat of the genus Agropyron in the family Agropyron.
Uff-type color rate
The proportion of buckwheat of different colors in the same batch of sweet buckwheat products. 3.3
Inperfert seed
Imperfect but edible grains, including worm-eaten grains, damaged grains, moldy grains, diseased grains, and sprouted grains; 3.4
Impurity
Matter that passes through the specified sieve layer and has no use value, including undersize, minerals, and other impurities. 3.5
Tartarian huckwhcat
Smaller than normal sweet grains, blunt corners, dark grain color, particularly shiny, rough grain surface, and the cortex is not easy to fall off. 3.6
Odour
The inherent smell of a batch of sweet wheat.
NY/T1503—2007Www.bzxZ.net
4 Requirements
4.1 The quality index of the wheat grain shall comply with the requirements of Table 1. Grade index
Grain
Coarse and strong protein (ten basis), R/kR
Biological content (T basis): g/kg
Moisture content, No.
Color ratio,
Bitter buckwheat, other
Imperfect grains, %
Impurities, %
Mineral content
Table 1 Quality index
Sanitary inspection and plant quarantine indexes shall be implemented in accordance with relevant national standards and regulations. 5 Inspection methods
General rules for inspection
According to GB 5490. 5.2 Sample support and sub-sampling
According to GB5191.
5.3 Incomplete grains, bitter buckwheat, impurities and odors shall comply with 6.3, 6.4, 6.5.6.7 of GB10458.5.4 Water content inspection
According to GB/T5497.
5.5 Crude protein
According to CB/T5511.
5.6 Bioflavonoids
According to Appendix A.
6 Packaging, transportation and storage
Packaging, transportation and storage shall comply with GB 8815--87 and GB8665--88. Etc.
120--100
: 5--10
A.1 Scope of application
Appendix A
Normative appendix
Determination of bioflavonoids
This method is applicable to the determination of bioflavonoids in buckwheat seeds, flowers and other organs. A.2 Principle
NY/T 1503—2007
Use methanol to extract the yellow-related substances (including rutin) in the sample sweet buckwheat powder: flavonoids react with aluminum salts to form a yellow complex, which turns red under alkaline conditions. The content of bioflavonoids is determined at an appropriate wavelength by spectrophotometry. The concentration of bioflavonoids is in a linear relationship with the absorbance in the range of 10 to 200 μg/ml. A.3 Instruments and equipment
A.3.1 Laboratory plant sample crusher
A.3.2 Analytical balance
Sensitivity 0.0001g.
A.3.3 Spectrophotometer
Use colorimetric blood, absorbance at 500m. A.3.4 150mL Soxhlet extractor
A.3.5 Porous water bath
A.3.6 Glassware
100mL25mL volumetric flasks, pipettes of various specifications. A.4 Reagent preparation
Use analytical pure reagents and distilled water that meet national standards. A.4.1 Rutin standard (made by Beijing Institute for the Control of Pharmaceutical and Biological Products) A.4.2 Anhydrous ether, methanol
A.4.35% Sodium nitrite
Weigh 5g analytical pure sodium nitrate and add distilled water to make up to 100ml. A.4.410% Aluminum Nitrate
Weigh 10g analytical pure calcium nitrate and add distilled water to make up to 100ml... A.4.54% Sodium Hydroxide
Weigh 4g analytical pure sodium hydroxide and add distilled water to make up to 100ml A.5 Selection and preparation of samples
Take representative sweet potato seed samples, peel them with a peeling machine, crush them with a high-energy plant product crusher, pass a 40-day sieve, place them in a 60℃~65℃ oven to dry for 8h, then pack them in a sealed sample bottle for later use, 3
NY/T 1503—2007
A.6 Determination steps
A.6.1 Preparation of test sample solution
Accurately weigh 0.5g~-1.0g (accurate to 0.0001g) of the prepared sample and place it in a filter paper bag. Wrap the paper bag and place it in the extractor. Add 60mL~100mL of anhydrous ether. Soak overnight, heat and reflux in a water bath at 70℃80℃ until the extract is colorless (about 4h-~5h), cool, discard the ether solution, add 60mL~1001nL of neutral alcohol solution + heat in a water bath at 90℃~95℃ until the extract is colorless (about 4h-~5h) h), cool, transfer the extract to a 100mL volumetric flask, make up to volume with water, shake well, and set aside for testing. A.6.2 Drawing of standard curve
Accurately weigh 50g (accurate to 0.0001g) of the standard sample that has been dried at 120℃ and placed in a small beaker. Add a small amount of methanol, dissolve in a hot water bath, cool, and then transfer to a 25ml volumetric flask, make up to volume with distilled alcohol. Shake well (concentration is 2mg/ml): Then use a pipette to draw 5.00ml of the standard solution. Place it in a 25mL volumetric flask, add distilled water to the scale, shake well: you can get a standard solution with a concentration of 0.2mg/ml.
Accurately pipette 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, and 6.0 mL of the above standard solutions and place them in 25 mL volumetric flasks respectively. Add 1.0 mL of 5% sodium nitrite solution to each flask and shake. After leaving for 6 minutes, add 1.0 mL of 10% lead nitrate solution, shake well, and leave for 6 minutes. Then add 10.0 mL of 4% sodium hydroxide to mark the absorption scale with water and shake well. After leaving for 15 minutes, use 1.0 cm colorimetric blood to determine the absorbance value at a wavelength of 500 nm. Then draw a standard curve.
A.6.3 Determination of bioflavonoid content in samples Accurately pipette 2.0 mL of the prepared sample solution (A.6.1) into a 25 mL volumetric flask, add 5% sodium nitrite solution, 10% aluminum nitrate solution, and 1% sodium hydroxide solution in sequence according to the standard curve determination method, and dilute to the scale with water, shake the spoon, and then use a 1.0 cm colorimetric blood to determine the absorbance value at a wavelength of 500 nm. Determine and calculate the bioflavonoid content in the test sample based on the standard curve. A.7 Calculation of determination results
A.7.1 Calculation formula (Formula A.7.1)
C (bioflavonoids%)
Wherein:
C: bioflavonoids content (g/kg);
P--value found on the curve (ug/ml);
color solution volume (25 ml);
D---division multiple, constant volume/division volume (100/2);M--weighed sample mass (g);
10--convert micrograms into grams (g).
: The result should be expressed to two decimal places. A.7.2 Allowable error
At least two parallel samples shall be taken for each sample for determination, and the arithmetic mean shall be the determination result. The relative deviation is allowed to be 5%. (A. 7.1)
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