Spegtrophotometrig Determination of α -Tocopherol Acetate in Soft Capsules
作者:
MagdaH. Barary,
MohamedE. Abdel Hamid,
EkramM. Haaaan,
MahmoudA. Elsayed,
期刊:
Analytical Letters
(Taylor Available online 1985)
卷期:
Volume 18,
issue 15
页码: 1835-1846
ISSN:0003-2719
年代: 1985
DOI:10.1080/00032718508062911
出版商: Taylor & Francis Group
关键词: α -tocopherol acetate;ethyl oleate;orthogonal function method;least squares method;second derivative spectrometry
数据来源: Taylor
摘要:
Two spectrophotometric methods have been described for the determination of α -tocopherol acetate (vitamin E) in soft capsules. The first method applies the orthogonal function method under least squares. The quadratic coefficients calculated over the wavelength range 277 - 304 nm at 4-nm intervals in chloroform were reproducible and independent of ethyl oleate concentration. The second method applies the second derivative (D2) to correct for irrelevant absorbance due to ethyl oleate The peak trough amplitude at 271 - 287 nm was in linear correlation to the concentration of vitamin E. The recoveries obtained using the proposed methods agreed with those obtained using the official proceduce.
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