L-THREONINE

Quality Standards: USP24.
 

Chemical Formula	C4H9O3N
Molecular Weight	119.12
[Compositional Specifications of L-Threonine]
Content	L-Threonine, when calculated on the dried basis, contains 98.0~102.0% of L-threonine (C4H9O3N)
Description	L-Threonine occurs as white crystals or crystalline powder. It is odorless and has a slightly sweet taste.
Identification	(1) L-Threonine has(1→25) levorotatory. (2) Proceed as directed under Identification and (2) and (3) in [DL-Threonine].
Purity	(1) Clarity of Solution : When 1 g of  L-Threonine dissolved in 20 ml of water, the solution is colorless and clear. (2) pH : When L-Threonine proceed as directed under glass electrode method, pH of an aqueous solution (1→20) should be 5.0∼6.5. (3) Specific rotation : After drying for 3 hours at 105°, approximately 3 g of  L-Threonine is precisely weighed, which is dissolved in water to make 50 ml. Optical rotation of this solution should be [α](20, D)  = -26∼-29°. (4) Arsenic : Proceed as directed under Purity (3) in [DL- Threonine]. (5) Heavy metals : Proceed as directed under Purity (4) in [DL-Threonine], the content should not be more than 20ppm. (6) Allothreonine and other Amino Acids : Proceed as directed under Purity (5) in [DL- Threonine]. (7) Chloride : Proceed as directed under Purity (6) in [DL- Threonine].
Loss on Drying	When DL- Threonine is dried for 3 hours at 105°, the weight loss should not be more than 0.2%.
Residue on Ignition	When thermogravimetric analysis is done with DL-Threomne, the amount of residues should not be more than 0.1%. Loss on ignition of this additive should not exceed 0.1%.
Assay	Proceed as directed under Assay in [DL- Threonine].        0.1 N Perchloric acid 1 ml = 11.91 mg of C4H9NO3

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Category: L-THREONINE