scholarly journals Quantitative determination of major oxidation products in edible oils by direct NP-HPLC-DAD analysis

2018 ◽  
Vol 1547 ◽  
pp. 62-70 ◽  
Author(s):  
Joaquín Velasco ◽  
Arturo Morales-Barroso ◽  
M. Victoria Ruiz-Méndez ◽  
Gloria Márquez-Ruiz
Keyword(s):  
Quantitative Determination ◽  
Edible Oils ◽  
Oxidation Products ◽  
Major Oxidation

Development and validation of a gas chromatography-mass spectrometry method for determination of sterol oxidation products in edible oils

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 41259-41268 ◽  
Author(s):  
Yinzhou Hu ◽  
Guoliang Yang ◽  
Weisu Huang ◽  
Shiyun Lai ◽  
Yiping Ren ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Oxidation Product ◽  
Edible Oils ◽  
Oxidation Products ◽  
Gas Chromatography Mass Spectrometry ◽  
Spectrometry Method ◽  
Mass Spectrometry Method ◽  
Development And Validation

An efficient GC-MS method for determination of sterol oxidation product profiles in edible oils was established by combination with optimized silylation, and validated using the standards of sitosterol oxidation products.

scholarly journals A New Approach for the Determination of Benzocaine and Procaine in Pharmaceuticals by Single-Sweep Polarography

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Serhij Plotycya ◽  
Oksana Strontsitska ◽  
Solomiya Pysarevska ◽  
Mykola Blazheyevskiy ◽  
Liliya Dubenska
Keyword(s):  
Quantitative Determination ◽  
Oxidation Products ◽  
Polarographic Reduction ◽  
Polarographic Method ◽  
Experimental Conditions ◽  
New Approach ◽  
Reduction Current ◽  
Product Specifications ◽  
Good Agreement

A new polarographic method for the determination of benzocaine and procaine based on the polarographic reduction of their chemically obtained oxidation products with potassium peroxymonosulfate is developed. Experimental conditions affecting quantitative yield of benzocaine and procaine oxidation products such as рH, oxidation time, reagents’ concentration, and temperature are explored. It is shown that the reduction current changes in a linear fashion (R=0.999) with increasing concentration of anesthetics over a concentration range of 1·10−6 - 5·10−5 mol L−1. The calculated limits of detection (LOD) for benzocaine and procaine are found to be 5.6·10−6 and 6·10−6 mol L−1, respectively. In the present study, quantitative polarographic determination of benzocaine in Farisil tablets and “Septolete Plus” lozenges and procaine in solution for injections is performed. The results of the analysis are in good agreement with the product specifications described in the quality certificates. The possibility of quantitative determination of benzocaine and procaine in pharmaceuticals is confirmed.

Quantitative Determination of Loadings and Oxidation Products of Polystyrene-Bound Phosphines Using31P MAS NMR

2003 ◽  
Vol 5 (5) ◽  
pp. 610-616 ◽  
Author(s):  
Daniel Rentsch ◽  
Roland Hany ◽  
Sophie Barthélémy ◽  
René Steinauer
Keyword(s):  
Quantitative Determination ◽  
Mas Nmr ◽  
Oxidation Products

Quantitative Determination of Antioxidants, after a Chromatographic Separation on Completely Acetylated Filter Paper. II. Determination of Some p-Phenylenediamine Derivatives

1957 ◽  
Vol 30 (4) ◽  
pp. 1172-1174
Author(s):  
J. W. H. Zijp
Keyword(s):  
Quantitative Determination ◽  
Filter Paper ◽  
Chromatographic Separation ◽  
Oxidation Products ◽  
Partition Chromatography ◽  
Rubber Compound

Abstract In this paper methods are given for the quantitative determination of three antioxidants, viz., N,N′-diphenyl-p-phenylenediamine, N,N′-di-2-naphthyl-p-phenylenediamine and N-phenyl-N′-cyclohexyl-p-phenylenediamine. According to these methods the antioxidants are extracted from the rubber compound, separated by partition chromatography on completely acetylated filter paper and oxidized to the corresponding p-quinonediimines, after which these oxidation products are determined colorimetrically.

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