A:
Evaporate under a stream of nitrogen to dryness 1 mL of the filtrate obtained in
Identification test
B, and dissolve the residue in 50 mL of alcohol: the UV absorption spectrum of the solution exhibits maxima and minima at the same wavelengths as that of a similar preparation of
USP Ergocalciferol RS, concomitantly measured.
B:
Triturate a quantity of powdered Tablets, equivalent to about 5 mg of ergocalciferol, with 10 mL of chloroform, and filter into a small flask: the filtrate so obtained responds to
Identification test
C under
Ergocalciferol.
701
:
30 minutes.