Reference

Influence of light on the quality of commercial nifedipine preparations

Influence of light on the quality of commercial nifedipine preparations. Terui, Kiyohiko; Shimoyama, Ritsuko; Sone, Ken; Fujita, Ko (Sch. Med., Hirosaki Univ., Hirosaki 036, Japan). Byoin Yakugaku, 10(3), 224-8 (Japanese) 1984. CODEN: BYYADW. DOCUMENT TYPE: Journal CA Section: 63 (Pharmaceuticals) The effect of light on com. prepns. of nifedipine (I) [21829-25-4] was detd. by using a fluorescent lamp at 860 lx, 3 cm from the beam source on 3 tablets and 3 capsules. I content was detd. every week for 4 wk by HPLC with IR detection. In prepns. packaged with PTP [92-94-4], tablet (C) and capsule (E) decreased after 4 wk. In prepns. without PTP packaging, a decrease in I content was obsd. in C and E after 1 wk and in all prepns. after 3 wk. On irradn. of pure and fine crystals, I content decreased gradually with time and was degraded completely into II [50428-14-3] on exposure to light for 7 days.

Measurement of the absolute radioluminescence output of a plastic scintillator excited by cobalt-60 g-rays

Measurement of the absolute radioluminescence output of a plastic scintillator excited by cobalt-60 g-rays. Andreeshchev, E. A.; Kilin, S. F. (USSR). Zh. Prikl. Spektrosk., 29(1), 56-61 (Russian) 1978. CODEN: ZPSBAX. ISSN: 0514-7506. DOCUMENT TYPE: Journal CA Section: 71 (Nuclear Technology) Section cross-reference(s): 73 The abs. output of plastic scintillator radioluminescence was measured by comparing its luminosity to that of Cherenkov radiators consisting of H2O and PhBr by exciting them with the same source of g-rays under identical conditions. The measurement method and the device are described and the error is estd. The output is 2.4 ± 0.2% for a std. compn. of plastic scintillator (polystyrene [9003-53-6], p-terphenyl [92-94-4], and POPOP [1806-34-4]).