Packaging and storage
Preserve in well-closed containers.
Specific rotation 781S:
10 mg per mL, in water (heat gently to dissolve, if necessary).
between 5.5 and 7.0, in a solution (1 in 100).
A 0.73-g portion shows no more chloride than corresponds to 0.50 mL of 0.020 N hydrochloric acid (0.05%).
A 0.33-g portion shows no more sulfate than corresponds to 0.10 mL of 0.020 N sulfuric acid (0.03%).
Heavy metals, Method II 231:
Organic volatile impurities, Method IV 467:
meets the requirements.
Transfer about 200 mg of Tryptophan, accurately weighed, to a 125-mL flask, dissolve in a mixture of 3 mL of formic acid and 50 mL of glacial acetic acid, and titrate with 0.1 N perchloric acid VS, determining the endpoint potentiometrically. Perform a blank determination, and make any necessary correction. Each mL of 0.1 N perchloric acid is equivalent to 20.42 mg of C11H12N2O2.
: Lawrence Evans, III, Ph.D., Scientist
Expert Committee : (DSN05) Dietary Supplements - Non-Botanicals
USP29NF24 Page 2224
: Volume No. 31(5) Page 1410
Phone Number : 1-301-816-8389