product name: l-threonine     
cas no.:72-19-5    
 
L-threonine is classified as an essential amino acid. Humans do not synthesize L-threonine, so it must be obtained through the diet. The male adult's daily requirement is 7 mg per kg of body weight. Most people will get sufficient L-threonine through the diet, but as threonine content in  Grains   is low, vegetarians are more likely than others to have deficiencies and should consider supplementation.
L-threonine is a key component of collagen, elastin and enamel proteins. It aids in proper fat metabolism in the liver; nutrients are more readily absorbed when threonine is present. L-threonine also helps the digestive and intestinal tracts function more smoothly. Experts believe that L-threonine enhances the immune system by aiding in the production of antibodies.
 
Applications:
L-threonine is an essential amino acid, mainly used in pharmaceutical, chemical reagents, food fortifiers, and feed additives. In particular, the amount used in feed additives grows rapidly. L-threonine with the feed has the following characteristics:    can adjust the amino acid balance in the feed to promote  livestock  growth; (2) to improve the meat; (3) improve the nutritional value of amino acid with low digestion rate    can reduce feed raw material costs; in the EU (mainly Germany, Belgium, Denmark, etc.) and the American States, it has been widely used in feed industry.

test item	limit
specific rotation	-27.6 to -29.0  ?/font>
state of solution (transmittance)	clear and colorless not less than 98.0%
chloride	not more than 0.020%
ammonium	not more than 0.02%
sulfate	not more than 0.020%
iron	not more than 10ppm
heavy metals(pb)	not more than 10ppm
arsenic	not more than 1ppm
other amino acids	chromatographically not detectable
loss on drying	not more than 0.20%
residue on ignition (sulfated)	not more than 0.10%
assay	99.0 to 100.5%
ph	5.2 to 6.2