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has been cited by the following article:

• TITLE: Analytical and Stability Studies on Medical Cosmetics

  AUTHORS: Manal I. Eid, Mary E. K. Wahba

  KEYWORDS: Panthenol; Spectrophotometry; Spectrofluorimetry; Stability Studies

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.3 No.3, March 29, 2012

  ABSTRACT: Two simple and sensitive spectrofluorimetric (method Ι) and spectrophotometric (method ΙΙ) methods have been developed for the determination of some chloride containing toothpastes and panthenol-containing cosmetic preparations respectively. Method Ι is based on quantitative fluorescence quenching of (terbium-salicylate-hexamine ternary complex) by fluoride which could be measured at λem/λex of 547 nm/322 nm. The ΔF-concentration plot was rectilinear over the concentration range of 0.5 - 20 μg/ml. Method ΙΙ depends reaction of panthenol with nitrobenzoxadiazole chloride (NBD-Cl) and measuring the absorbance of the resultant product at 480 nm. The absorbance-concentration plot was rectilinear over the concentration range of 2 - 20 μg/ml.