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C2H5NO2 75.07

Glycine [56-40-6].
» Glycine contains not less than 98.5 percent and not more than 101.5 percent of C2H5NO2, calculated on the dried basis.
Packaging and storage— Preserve in well-closed containers.
Identification, Infrared Absorption197M.
Loss on drying 731 Dry it at 105 for 2 hours: it loses not more than 0.2% of its weight.
Residue on ignition 281: not more than 0.1%.
Chloride 221 A solution of 1.0 g in water shows no more chloride than corresponds to 0.10 mL of 0.020 N hydrochloric acid (0.007%).
Sulfate 221 A solution of 3.0 g in water shows no more sulfate than corresponds to 0.20 mL of 0.020 N sulfuric acid (0.0065%).
Heavy metals 231: 0.002%.
Hydrolyzable substances— Boil 10 mL of a 1 in 10 solution of it for 1 minute, and set aside for 2 hours: the solution appears as clear and as mobile as 10 mL of the same solution that has not been boiled.
Assay— Transfer about 150 mg of Glycine, accurately weighed, to a 250-mL flask, dissolve in 100 mL of glacial acetic acid, add 1 drop of crystal violet TS, and titrate with 0.1 N perchloric acid VS to a green endpoint. Perform a blank determination, and make any necessary correction. Each mL of 0.1 N perchloric acid is equivalent to 7.507 mg of C2H5NO2.
Auxiliary Information— Please check for your question in the FAQs before contacting USP.
Topic/Question Contact Expert Committee
Monograph Curtis Phinney

(DSN05) Dietary Supplements - Non-Botanicals
Reference Standards Lili Wang, Technical Services Scientist
USP32–NF27 Page 2515
Chromatographic Column—
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.