[0035] Add 500g of purified water and 500g of absolute ethanol to a 2L three-necked flask, stir evenly, put 50g of the crude racemic hydroxymethionine calcium into the three-necked flask, heat up to 70-80°C and reflux for 1h±30min, after dissolving, add 0.4g of activated carbon, Decolorize for 30 minutes, heat filter, cool the filtrate to 0-10°C, grow crystals for 3 hours, filter, wash the filter cake with 25g of absolute ethanol to obtain the wet product of racemic hydroxymethionine calcium, dry the wet product at 50-60°C for 6- After 8 hours, 32.5 g of racemic hydroxymethionine calcium was obtained, with a yield of 65%. The obtained racemic hydroxymethionine calcium was determined by X-ray diffraction, and the characteristic peak positions were 2θ=5.6±0.2°, 11.0±0.2°, 11.5±0.2° , 14.3±0.2°, 19.7±0.2°, 22.1±0.2°, 24.7±0.2°, 29.0±0.2°, 31.0±0.2°, 33.3±0.2°.
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[0041] 1. Accelerated test investigation data
[0042] The content of racemic hydroxymethionine calcium was determined by potentiometric titration (Chinese Pharmacopoeia 2015 Edition, Four General Rules 0702), and related substances were determined by high performance liquid chromatography (Chinese Pharmacopoeia 2015 Edition, Four General Rules 0512).
[0043] The related substances are calculated according to the main component self-contrast method, and the stainless steel column (Welch Materials LP-C18, 4.6mm*250mm, 5um) with octadecylsilane bonded silica gel as the filler is mixed with 0.05mol / L disodium hydrogen phosphate (with Adjust the pH value to 2.5 with phosphoric acid)-acetonitrile (88:12) as the mobile phase, the detection wavelength is 205nm, the column temperature is 40°C, and the flow rate is 1.0ml / min.
[0044] The content is titrated by point titration with perchloric acid. METTLER TOLEDO Potentiometric Titrator.
Product Description
Calcium hydroxymethionine, abbreviated as MHA-Ca, is a calcium salt containing 84% HMTBA (2-hydroxy-4-methylthiobutyric acid) and is mainly used as a feed additive. MHA has been used in animal husbandry since the 1950s, and MHA has proven to be a superior source of methionine for feed, livestock and pet manufacturers.
Items
Standards
Results
Physical Analysis
Description
White Crystalline Powder
Complies
Assay
99%
99.5%
Mesh Size
100 % pass 80 mesh
Complies
Ash
≤ 5.0%
2.85%
Loss on Drying
≤ 5.0%
2.85%
Chemical Analysis
Heavy Metal
≤ 10.0 mg/kg
Complies
Pb
≤ 2.0 mg/kg
Complies
As
≤ 1.0 mg/kg
Complies
Hg
≤ 0.1 mg/kg
Complies
Microbiological Analysis If you want to learn more, please visit our website china 1,3-dimethylurea Manufacturers.
Residue of Pesticide
Negative
Negative
Total Plate Count
≤ 1000cfu/g
Complies
Yeast&Mold
≤ 100cfu/g
Complies
E.coil
Negative
Negative
Salmonella
Negative
Negative
This product is widely used in organic synthesis, dyes, pharmaceuticals, pesticides, etc.
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