GB/T 17810-2009 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 17810-2009 | English | 85 |
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Feed grade DL-methionine
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| GB/T 17810-1999 | English | 319 |
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Feed Grade DL--Methionine
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GB/T 17810-2009: Feed grade DL-methionine---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT17810-2009
ICS 65.120
B 46
GB
National Standard
of the People’s Republic of China
Replacing GB/T 17810-1999
Feed grade DL-methionine
Issued on. MAY 26, 2009
Implemented on. OCTOBER 1, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
1 Scope... 4
2 Normative references... 4
3 Requirements... 5
4 Test methods... 5
5 Inspection rules... 12
6 Labeling, packaging, transportation, and storage... 13
Foreword
This Standard replaces GB/T 17810-1999 "Feed grade DL-methionine".
The main technical differences between this Standard and GB/T 17810-1999
are as follows.
- REVISE GB/T 6678 in normative references to GB/T 14699.1;
- REVISE 3.1 in previous standard to "Appearance and characters - White
or light gray powder or flaky crystals. It is slightly-soluble in water. It is
extreme-slightly-soluble in ethanol. It is slightly-soluble in diluted acid and
sodium hydroxide (potassium) solutions";
- Tolerance in 4.1.5 of previous standard is adjusted from “absolute
differences of two parallel determination results shall not be greater than
0.1%” to “absolute differences of two parallel determination results shall
not be greater than 0.3%”;
- ADD the product identification methods (ion exchange chromatography);
- MODIFY the determination methods of heavy metals;
- MODIFY the arsenic determination methods;
- ADD "factory-exit inspection" and "type inspection" in inspection rules.
This Standard was proposed by and shall be centralized by National
Standardization Technical Committee of Feed Industry.
This Standard was drafted by Feed Research Institute, Chinese Academy of
Agricultural Sciences.
Main drafters of this Standard. Fan Zhiying, Liu Qingsheng, Ma Shuyu, Tian
Yuan, Shi Dongdong.
The previous version replaced by this Standard is.
- GB/T 17810-1999.
Feed grade DL-methionine
1 Scope
This Standard specifies the requirements, test methods, inspection rules,
labeling, packaging, storage, and transportation of feed grade DL-methionine
products.
This Standard applies to the feed grade DL-methionine that uses
methylthiopropanal, cyanide, sulfuric acid, and sodium hydroxide as main raw
materials.
Chemical name. 2-amino-4-methylthio butyric acid
Chemical formula. CH3S-CH2-CH2-CH (NH2) -COOH
Relative molecular mass. 149.2 (according to Year-2007 international relative
atomic mass)
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard.
However, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 601 Chemical reagent - Preparations of standard volumetric solutions
GB/T 1250 Rules for expression and judgment of limiting values
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
GB 10648 Feed label
GB/T 14699.1 Animal Feeding Stuffs - Sampling
"Pharmacopoeia of People's Republic of China" Volume 2, Edition 2005
3 Requirements
3.1 Appearance and characters
White or light gray powder or flaky crystals. It is slightly-soluble in water. It is
extreme-slightly-soluble in ethanol. It is slightly-soluble in diluted acid and
sodium hydroxide (potassium) solutions.
4 Test methods
The reagents and the water used in this Standard, except those particularly
indicated, refer to the analytical reagents and grade 3 water that is complied
with the specifications in GB/T 6682.Instruments and equipment are general
laboratory instruments and equipment.
4.1 Appearance and characters
Appearance and character assessment shall meet the requirements of 3.1.
4.2 Identification
4.2.1 Reagents and solutions
4.2.1.1 Saturated anhydrous copper sulfate sulfuric acid solution. TAKE
anhydrous copper sulfate. Add to concentrated sulfuric acid. STIR until
precipitation occurs.
4.2.1.7 Ninhydrin solution. PREPARE according to the instructions of amino
acid automatic analyzer.
4.2.1.8 Methionine standard stock solution c(methionine) = 2.50 μmol / mL.
WEIGH 93.3 mg of methionine in a 100-mL beaker. ADD about 50 mL of water
and several drops of concentrated hydrochloric acid to dissolve. TRANSFER
quantitatively to a 250-mL volumetric flask. USE water to dissolve and FIX the
volume.
4.2.2 Instruments
Amino acid automatic analyzer. Ninhydrin post-column derivatization
ion-exchange chromatography. It requires that the resolution of each amino
acid shall be greater than 90%.
4.2.3 Identification steps
4.2.3.1 WEIGH 25 mg of samples. ADD 1 mL of saturated anhydrous copper
sulfate sulfuric acid solution (4.2.1.1). The liquid is yellow.
4.3 Determination of DL-methionine content
4.3.1 Principle
ADD excessive iodine solution accurately into neutral medium. ADD 2 iodine
atoms to the sulfur atoms of methionine. USE sodium thiosulfate standard
titration solution to re-titrated the excessive iodine solution.
4.3.2 Reagents and solutions
4.3.2.1 Potassium phosphate dibasic solution. 500 g / L.
4.3.2.6 Starch solution. 10 g / L.
4.3.3 Instruments
4.3.3.1 Analytical balance. The sensitivity is 0.1 mg.
4.3.3.2 Magnetic stirrer.
4.3.4 Analysis steps
WEIGH 0.23 g ~ 0.25 g of sample (accurate to 0.000 1 g). PUT into a 500-mL
iodine flask. ADD 70 mL of deionized water. Then ADD the following reagents
respectively. 10 mL of potassium phosphate dibasic solution (4.3.2.1), 10 mL
of potassium dihydrogen phosphate solution (4.3.2.2), 10 mL of potassium
iodide solution (4.3.2.3). After they are all dissolved, ADD 50.00 mL of iodine
solution (4.3.2.4) accurately.
4.3.5 Calculation of the results
Methionine content X1 is calculated according to the formula (1).
In the formula.
4.4 Determination of loss on drying
4.4.1 Principle
DRY the samples in a (105 ± 2) °C oven under atmospheric pressure to
constant WEIGH.
4.4.2 Analysis steps
WEIGH about 10 g of samples (accurate to 0.000 2g) by a weighing dish which
has been constant-weight. PLACE in a 105 °C oven to dry for 3 h. Then TAKE
them out. And PUT in a dryer to cool for 30 min. Then WEIGH it. DRY for 1 h in
the same way, then WEIGH it, until the difference of mass between 2
weighings is less than 0.002 g.
4.5 Determination of chloride content
4.5.1 Principle
After samples are dissolved, ADD nitric acid and silver nitrate to react with
chloride to form silver chloride turbid solution. COMPARE with standard hue.
4.5.2 Reagents and solutions
4.5.3 Analysis steps
4.6 Determination of heavy metals
4.6.1 Principle
After the samples are dissolved, heavy metals react with sodium sulfide to
form brown sulfide under the test conditions. COMPARE with comparison
solution under the same conditions.
4.6.2 Reagents and solutions
4.6.2.1 Sodium hydroxide solution. 43 g / L.
4.6.2.2 Sodium sulfide solution. 100 g / L.
5 Inspection rules
5.1 Products shall be inspected by quality inspection department of the
manufacturer. The manufacturer shall ensure that all products exiting factory
shall meet the requirements of Chapter 3 of this Standard. And accompany
with quality certificates in certain format.
5.2 The products produced and packaged by the same batch of raw materials,
by the same shift, with the same process condition, same batch number, same
specification, and same quality certificates are deemed as a batch.
5.4 Factory-exit inspection. Each batch of products shall be conducted for
factory-exit inspection when exiting the factory. The inspection items are
sensory index, loss on drying, and DL-methionine content.
5.5 Type inspection. Type inspection shall be conducted once every 6 months.
Type inspection items include all the requirements specified in Chapter 3 of
this Standard. When there is 1 of the following situations, it shall conduct type
inspection for the product quality.
5.6 Judgment rules. The products of which all inspection results meet the
requirements of Chapter 3 of this Standard are judged as qualified. When there
is 1 indicator not meeting the requirements of this Standard, it shall be
re-sampled for re-inspection. It is judged as unqualified when there is 1 item in
re-inspection result not complying with this Standard.
6 Labeling, packaging, transportation, and storage
6.1 The content of labels shall comply with the specification of GB 10648.
6.2 The products are packaged in bags. The packaging bags are divided into 3
layers
6.3 The products shall be prevented from rain, moisture, and sunlight during
transportation. It is strictly prohibited that transporting with toxic substances.
6.4 The products shall be stored in a dry, clean indoor warehouse. Avoid the
rain and moisture.
6.5 Shelf life of original packaging under specified storage conditions is 36
months.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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