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Calcitrol

Analytical Profiles of Drug Substances, ISSN: 0099-5428, Vol: 8, Issue: C, Page: 83-100
1979
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This chapter provides an overview of calcitrol. Calcitrol is an odorless white crystalline powder. The infrared spectrum of calcitrol is shown in the chapter. The spectrum has been recorded on a Perkin–Elmer Model 283 Grating Infrared Spectrophotometer and has been measured in a KBr pellet that contains 1 mg of calcitrol in 300 mg of KBr. The low-resolution mass spectrum of calcitrol is also shown in the chapter. The spectrum has been obtained using a Varian MAT CH5 spectrometer that is interfaced with a Varian data system 620 I. The data system accepts the output of the spectrometer, calculates the masses, compares the intensities to the base peak, and plots this information as a series of lines whose heights are proportional to the intensities. The molecular ion has been measured at m / e = 416. Other characteristic masses have been observed at m / e = 398, 380 and 362, corresponding to the loss of one, two and three molecules of water, respectively, from the molecular ion; m / e = 383, corresponding to the loss of water and CH 3 from the parent peak; and m / e = 365, corresponding to the loss of two water molecules and one CH 3 from the molecular ion. The base peak is observed at m / e 3= 134.

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