What is the national quality standard for cottonseed meal and soybean meal?

1 Subject content and scope of application

This standard specifies the terms, classification, technical requirements, inspection rules, inspection methods, packaging, transportation and storage requirements of edible soybean meal.

This standard is applicable to commercial edible soybean meal.

2 reference standard

GB 5009. 12 determination method of lead in food

Analysis method of GB 5009.36 food hygiene standard

GB 5490~5539 Inspection of grain, oilseeds and vegetable oils

GB 8 1 15 grain packaging bag

GB 86 1 1 soybean for oil industry

3 terminology

3. 1 edible soybean meal

Loose protein-rich materials suitable for food processing are made from soybeans by leaching (preloading leaching or direct leaching).

3. 1. 1 high denatured soybean meal (also called high temperature soybean meal)

After high temperature treatment, the protein denaturation of soybean meal is large, and the water-soluble protein content is low. Mainly used as raw materials for food processing such as wine making and protein products.

3. 1.2 Low denatured soybean meal (also called low temperature soybean meal)

After low-temperature desolventization or flash evaporation, the protein denaturation of soybean meal is small, and the water-soluble protein content is high. Mainly used as raw materials for processing tissue protein, concentrated protein, isolated protein and protein products.

3.2 shape

Refers to the particle size and uniformity of a batch of soybean meal.

3.3 color

Refers to the comprehensive color of a batch of soybean meal.

3.4 smell

Refers to the comprehensive smell of a batch of soybean meal.

3.5 impurities

It refers to the substances in soybean meal that can be recognized by naked eyes except soybean meal.

3.6 Percentage of water-soluble protein (%)

Refers to the percentage of protein dissolved in water to the sample weight under the specified determination conditions.

3.7 Nitrogen Dissolution Index (NSI,%)

Refers to the percentage of water-soluble nitrogen in total nitrogen or the percentage of water-soluble protein in crude protein.

3.8 Sand content (%)

Refers to the percentage of fine sand contained in soybean meal in the sample weight.

4 product classification

4. 1 highly denatured soybean meal

4. 1. 1 first-class highly denatured soybean meal;

4. 1.2 Secondary highly denatured soybean meal.

4.2 Low denatured soybean meal

4.2. 1 primary low denatured soybean meal;

4.2.2 Secondary low denatured soybean meal.

5 technical requirements

5. 1 raw materials

5. 1. 1 shall comply with the provisions of GB 86 1 1.

5. 1.2 shall not contain castor seeds, wild lily seeds and other harmful weed seeds.

5. 1.3 There should be no smoke, corruption, mildew and bad smell.

5. 1.4 There shall be no irredeemable defective products during processing.

5.2 Appearance quality

See table 1:

Table 1

project

fingerprint

shape

Loose flakes, powders or particles.

colour and lustre

High denatured soybean meal: It has the inherent color of soybean meal.

Low denatured soybean meal: it has the inherent yellow-white to yellow color of soybean meal.

smell

It has the inherent smell of soybean meal and has no musty smell.

5.3 Quality indicators

See Table 2:

5.4 impurities

Do not mix non-soybean meal materials such as grain flour.

5.5 Health indicators

According to the relevant national health regulations.

6 inspection method

6. 1 Sampling of edible soybean meal shall be carried out according to GB 549 1.

6.2 The identification of color and smell shall be carried out according to GB 5492.

6.3 The determination of moisture shall be carried out according to GB 5497.

6.4 The crude protein was determined according to GB 55 1 1.

6.5 The water-soluble protein shall be determined according to GB 55 1 1 Appendix A..

6.6 Calculation of nitrogen solubility index (NSI,%):

N 1

NSI(%)=—× 100

ordinary

or

water

NSI(%)=──× 100

Rough

Where: N 1── water-soluble nitrogen, g;

N── total nitrogen in the sample, g;

N water ── water soluble protein, g;

Coarse protein, g;

6.7 The crude fat shall be determined according to GB 55 12.

6.8 The determination of crude cellulose shall be carried out according to GB 55 15.

6.9 The determination of ash shall be carried out according to GB 5505.

6. The determination of sand content in10 shall be carried out according to GB 5508.

6. 1 1 Impurities shall be determined according to Appendix A of this standard.

Table 2

minute

kind

point to

mark

project

eye

High denatured soybean meal

Low denatured soybean meal

Level a

assistant

Level a

assistant

Moisture,% ≤

Impurity,% ≤

Crude protein,% (dry basis) ≥

Nitrogen solubility index (NSI),% ≥

Crude fat,% (dry basis) ≤

Crude cellulose,% (dry basis) ≤

Ash,% (dry basis) ≤

Sand content,% ≤

South 12.0

North 13.0

0. 10

49.0

-

2.0

5.0

6.5

0.50

South 12.0

North 13.0

0. 10

46.0

-

2.0

7.0

6.5

0.50

12.0

0. 10

50.0

80

2.0

3.5

6.5

0. 10

12.0

0. 10

50.0

70

2.0

3.5

6.5

0. 10

Note: ① Northern provinces include three northeastern provinces, Inner Mongolia, Shanxi, Hebei, Beijing, Tianjin, Shandong, Ningxia, Shaanxi, Gansu and Qinghai.

The rest are southern provinces.

② The sand content of highly denatured soybean meal used for processing tissue protein is ≤ 0. 10%.

6. 12 The dopant inspection shall be conducted according to Appendix B of this standard.

6. 13 The determination of health indicators should be carried out in accordance with the relevant national health inspection methods.

7 inspection rules

7. 1 The product must be delivered for ex-factory inspection. The inspection samples shall be properly kept for one month for re-inspection.

7.2 Moisture, impurities, nitrogen solubility index (NSI) and crude fat shall be sampled and tested together with production; Crude cellulose, ash and sand content can be sampled and tested regularly according to raw material batches.

7.3 The sampling of product samples shall be carried out according to GB 5490 and GB 549 1.

7.4 The moisture content of highly denatured soybean meal products shall be subject to the user's index or agreed by both parties.

7.5 If there is any objection to the product inspection results, the samples shall be sent to the Grain, Oil and Food Supervision and Inspection Station of the Ministry of Commerce (Beijing, Shanghai and Wuhan) or an inspection unit agreed by both parties for re-inspection and arbitration.

8 packaging, transportation and storage

8. 1 Packaging shall be carried out according to GB 8 1 15.

8.2 Transportation shall be carried out in accordance with the relevant regulations of the Ministry of Commerce of People's Republic of China (PRC) and China on grain and oil transportation.

8.3 Storage shall be conducted in accordance with Technical Specifications for Grain and Oil Storage in People's Republic of China (PRC) and relevant regulations of Ministry of Commerce in China.

After the National Day in 2002, oil plants in Jingzhou, Xiangfan, Jingmen, Tianmen, Xiaogan and Yichang, the main cotton producing areas in Hubei Province, began to purchase and process new cottonseed this year. Due to the long-term favorable weather in autumn in Hubei this year, good conditions have been created for the harvest of autumn cotton. Therefore, in 2002, the moisture of new cotton was better, and the cottonseed processed by the flower factory was dry. The oil content of the whole cottonseed is generally above 16%, which is 3 percentage points higher than that of the previous year, which is conducive to the acquisition and processing of cottonseed this year. The oleic acid price of cotton wool produced by oil factory is generally 3-4, which is also beneficial to the refining of cotton oil. The refining rate of cotton oil in most oil plants increased by 3% compared with the previous year, and the protein content of cottonseed meal passed the test.