» Ethyl Vanillin, dried over phosphorus pentoxide for 4 hours, contains not less than 98.0 percent and not more than 101.0 percent of C9H10O3.
Packaging and storage Preserve in tight, light-resistant containers.
Solution: 8 µg per mL.
Melting range 741: between 76 and 78.
Loss on drying 731 Dry it over phosphorus pentoxide for 4 hours: it loses not more than 1.0% of its weight.
Residue on ignition 281: not more than 0.1%.
Assay Dissolve about 300 mg of Ethyl Vanillin, previously dried and accurately weighed, in 50 mL of dimethylformamide contained in a 125-mL conical flask. Add thymol blue TS, and titrate with 0.1 N sodium methoxide VS, using a magnetic stirrer and taking precautions against the absorption of atmospheric carbon dioxide. Perform a blank determination, and make any necessary correction. Each mL of 0.1 N sodium methoxide is equivalent to 16.62 mg of C9H10O3.
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USP32NF27 Page 1234
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.