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L-Hydroxyproline

L-Hydroxyproline

Test itemAcceptance Criteria
DescriptionWhite crystals or crystalline powder, odorless or slight characteristic odor, slight sweet
Identification A yellow color develops
Purity
Clarity and color of solutionAlmost clear and colorless
Optical rotation (Dried basis)[α]20D = -74.0 to -77.0°
pHpH 5.0 to 6.5
ChlorideNot more than 0.1 %
Heavy metals (as Pd)Not more than 20 μg/g
Arsenic (as As2O3)Not more than 4.0 μg/g
Loss on dryingNot more than 0.30 %
Residue on IgnitionNot more than 0.20 %
Assay (Dried basis)98.0 to 102.0 %
Standard Plate Count (Total Plate Count)Not more than 1,000/g (Tentative)
Coliform bacteria (or E.COLI)Negative
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