Selenomethionine
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
C5H11NO2Se 196.11 CAS RN: 1464-42-2.- [CAUTION-Handle with care, as this reagent is highly toxic.]
Assay: Weigh accurately about 750 mg, dissolve in 100 mL of methanol, add crystal violet TS, and titrate with 0.1 N perchloric acid to a blue-green endpoint. Each mL of 0.1 N perchloric acid is equivalent to 19.61 mg of C5H11NO2Se: between 97.0% and 103.0%, calculated on the as-is basis, is found.
MELTING RANGE (741): about 260°, with decomposition.
NITROGEN DETERMINATION (461): Determine by the Kjeldahl method: between 6.8% and 7.4%, calculated on the as-is basis, is found.
