Simultaneous determination of water- and fat-soluble vitamins, lycopene and beta-carotene in tomato samples and pharmaceutical formulations: Double injection single run by reverse-phase liquid chromatography with UV detection

2018 ◽  
Vol 70 ◽  
pp. 9-17 ◽  
Author(s):  
Maria Teresa Melfi ◽  
Donatella Nardiello ◽  
Nunzia Cicco ◽  
Vincenzo Candido ◽  
Diego Centonze
Keyword(s):  
Liquid Chromatography ◽  
Simultaneous Determination ◽  
Beta Carotene ◽  
Pharmaceutical Formulations ◽  
Uv Detection ◽  
Reverse Phase ◽  
Reverse Phase Liquid Chromatography ◽  
Phase Liquid ◽  
Fat Soluble Vitamins

Simultaneous determination of metformin and glimepride in pharmaceutical dosage form by reverse-phase liquid chromatography

2005 ◽  
Vol 28 (16) ◽  
pp. 2076-2079 ◽  
Author(s):  
Bhaskar Laxmanrao Kolte ◽  
Bharat Baburao Raut ◽  
Adwait Anant Deo ◽  
Manoj Anil Bagool ◽  
Devanand Baburao Shinde
Keyword(s):  
Liquid Chromatography ◽  
Simultaneous Determination ◽  
Dosage Form ◽  
Reverse Phase ◽  
Pharmaceutical Dosage Form ◽  
Reverse Phase Liquid Chromatography ◽  
Phase Liquid

Determination of Diacetyl in Butter as 2,3-Diaminonaphthalene Derivative, Using a Fluorometric Procedure or Reverse Phase Liquid Chromatography with Fluorescence Detection

1988 ◽  
Vol 71 (3) ◽  
pp. 462-465
Author(s):  
Pietro Damiani ◽  
Giovanni Burini
Keyword(s):  
Liquid Chromatography ◽  
Fluorescence Detection ◽  
The Other ◽  
Reverse Phase ◽  
Reverse Phase Liquid Chromatography ◽  
Fluorescence Characteristics ◽  
Chromatographic Procedure ◽  
Phase Liquid ◽  
Liquid Chromatographic

Abstract Two procedures, one fluorometric and the other reverse phase liquid chromatographic, for determination of a derivative of diacetyl are described. Exploratory work on diacetyl standard solutions to establish the best conditions for the derivatization with 2,3-diaminonaphthalene (DAN) to yield 2,3-dimethylbenzo[g]-quinoxaline (DMBQ) is discussed, as well as the fluorescence characteristics of the DMBQ derivative. Diacetyl was determined in 10 commercial butter samples by the proposed procedures and by other known methods (determination of o-phenylenediamine and 3,3-diaminobenzidinederivatives). Recoveries from butter samples spiked with known amounts of diacetyl ranged from 96.9 to 101.8% (with CVs ranging from 0.3 to 2.1%) for the fluorometric procedure and from 96.9 to 102.7% (with CVs ranging from 0.5 to 2.4%) for the chromatographic procedure. These results agree well with those obtained with o-phenylenediamine and 3,3-diaminobenzidine methods on the same butter samples. The proposed methods have the advantages of improved detectability and specificity.

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