GB/T 19541-2017Feed materials—Soybean meal (English PDF)

3.1 Protein solubility in potassium-hydroxide solution

The mass fraction of the crude protein content of the soybean meal sample which, under the conditions as shown in Appendix A, can be soluble in 0.2% potassium hydroxide solution to the total crude protein content in the sample.

4.1 Sensory traits

This product is light yellow or light brown or reddish brown, in irregular fragments or coarse particles or coarse powder, without fermentation, mildew, insect damage or odors.

4.2 Quality grade indicators

The quality grade indicators are as shown in Table 1.

4.4 Net content

The net content shall comply with the indications on the label, the deviation shall comply with the provisions of the Administrative measures for the supervision of quantitative packaging commodity measurement.

5.1 Sensory traits

It shall be performed in accordance with the provisions of clause 7 of GB/T 14698-2002.

5.2 Crude protein

It shall be performed in accordance with the provisions of GB/T 6432.

5.6 Lysine

It shall be performed in accordance with the provisions of GB/T 18246.

5.7 Urease activity

It shall be performed in accordance with the provisions of GB/T 8622.

5.8 Potassium hydroxide protein's solubility

It shall be performed in accordance with the provisions of Appendix A.

5.9 Hygiene indicators

It shall be performed in accordance with the provisions of GB 13078.

5.10 Net content

It shall be performed in accordance with the provisions of JJF 1070.

6.1 Group-batch

The products which are continuously manufactured using the same batch of raw materials and the same process at the same production day with the same specifications form one batch.

6.2 Sampling

It is performed in accordance with the provisions of GB/T 14699.1.

6.4 Type inspection

In one of the following cases, a type inspection shall be carried out, the inspection items shall include all items specified in this standard.

6.5 Judgment rules

6.5.1 The allowable error of the judgment of the test results shall be in accordance with the provisions of GB/T 18823.

7.1 Labeling

It is performed in accordance with the provisions of GB 10648. The soybean meal which is produced by the use of genetically modified soybeans shall follow the provisions of the "Administrative measures for the identification of agricultural genetically modified organisms"

7.2 Packaging

Quantitative packaging, or packaging in accordance with user requirements.

7.4 Storage

It is stored in a ventilated, dry place. It shall not store it with toxic or hazardous materials or other contaminative items.

A.1 Principle of the method

The solubility of crude protein of soybean meal in potassium hydroxide solution is affected by the degree of thermal processing. Under the specified conditions, the crude protein content of the soybean meal sample which is dissolved in the potassium hydroxide solution as well as the crude protein content of the sample are respectively determined, the ratio of the contents of the two is calculated to obtain the solubility of the potassium hydroxide protein.

A.2 Reagent

Unless otherwise specified, it only uses the analytically pure reagents.

A.3 Instruments

A.3.1 Laboratory sample crusher. No strong heat shall be generated during pulverization.

A.3.2 Sample sieve. The pore size is 0.25 mm.

A.3.3 Analytical balance. The sensitivity is 0.0001 g.

A.4 Preparation of specimen

It is performed in accordance with the provisions of GB/T 20195, make the crushed sample pass through the 0.25 mm aperture sample sieve, mix it thoroughly, contain it into the stoppered grinding-mouth jar to prepare for use.

A.5 Steps for determination

A.5.1 WEIGH 1.0 g of sample material, accurate to 0.0001 g, PLACE it in a 250 mL high beaker (A.3.6).

A.6 Calculation of results

The solubility of potassium hydroxide protein is expressed as mass fraction X, the value is expressed in %, calculated in accordance with formula (A.1). […]