Improved method for the simultaneous determination of whey proteins, caseins and para-κ-casein in milk and dairy products by capillary electrophoresis

2001 ◽  
Vol 915 (1-2) ◽  
pp. 225-230 ◽  
Author(s):  
Beatriz Miralles ◽  
Volker Rothbauer ◽  
Marı́a A Manso ◽  
Lourdes Amigo ◽  
Ingolf Krause ◽  
...  
Keyword(s):  
Capillary Electrophoresis ◽  
Simultaneous Determination ◽  
Dairy Products ◽  
Whey Proteins ◽  
Improved Method ◽  
Milk And Dairy Products

scholarly journals Simultaneous determination of some steroid hormones in milk and dairy products by liquid chromatography tandem mass spectrometry (LC-MS/MS)

2019 ◽  
Vol 2 (2) ◽  
pp. 8-15
Author(s):  
Tu Vu Ngoc ◽  
Thu Hang Do Thi ◽  
Chi Le Dinh ◽  
Mai Dau Chi ◽  
Hien Dang Thi ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Simultaneous Determination ◽  
Steroid Hormones ◽  
Dairy Products ◽  
Ion Source ◽  
Tandem Mass ◽  
Tandem Mass Spectrometric ◽  
Milk And Dairy Products

A sensitive method has been developed and validated for simultaneous determination of some steroid hormones (trenbolone, 17β-estradiol, progesterone, testosterone, estrone, melengestrol acetate and zeranol). Samples were hydrolyzed to release analytes, and analytes were then extracted from sample matrix using QuEChERS technique, detected and quantified by using reversed phase liquid chromatography coupled with tandem mass spectrometry. The tandem mass spectrometric detection was done by using ESI ion source working in positive mode and multiple reaction monitoring (MRM) quantitation. Validation results show that the method is sensitive and selective for analyzing seven steroid hormones on milk and dairy products. The quantitation limit of the method for these analytes ranged from 0.1 to 2.0 µg/kg. Method recovery was from 70.4 to 110.0 %. Relative coefficient of variation varied from 2.7 to 12%. The method was applied to determine steroid hormones in 40 milk and dairy product samples collected from different markets and commercial centers in Hanoi.  

scholarly journals Study of Simultaneous Determination of Residual Veterinary Drugs Including Tetracyclines Antibiotics in Milk and Dairy Products

2009 ◽  
Vol 50 (5) ◽  
pp. 216-222 ◽  
Author(s):  
Emiko YOSHIDA ◽  
Takahiro SHIBUYA ◽  
Chieko KUROKAWA ◽  
Yutaka INOUE ◽  
Yoshihiko YAMAMOTO ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Dairy Products ◽  
Veterinary Drugs ◽  
Milk And Dairy Products

Capillary electrophoresis with dual C4D/UV detection for simultaneously determining major metal cations and whey proteins in milk

2021 ◽  
Author(s):  
Jing Zhao ◽  
Zhongqi Xu
Keyword(s):  
Capillary Electrophoresis ◽  
Simultaneous Determination ◽  
Whey Proteins ◽  
Sample Pretreatment ◽  
Metal Cations ◽  
Uv Detection ◽  
Milk Samples

A reliable and simple CE method with dual C4D and UV detection modes for simultaneous determination of major metal cations and whey proteins in milk samples was developed. Sample pretreatment...

Simultaneous Determination of Several Elements by Spectrochemical Addition Method … (II) (Tabulation of Analytical Value)

1968 ◽  
Vol 22 (6) ◽  
pp. 749-752 ◽  
Author(s):  
Isoo Masuda ◽  
Tamon Inouye
Keyword(s):  
Simultaneous Determination ◽  
Order Approximation ◽  
Analytical Data ◽  
Zero Order ◽  
Dilution Factor ◽  
Improved Method ◽  
Addition Method ◽  
Zero Order Approximation ◽  
First Approximation

An improved method for the tabulation of analytical data, obtained by addition and successive dilution procedures for spectrochemical analysis, is presented. The author's previous work shows that the solution of the first approximation diverges at some dilution factor smaller than unity when the slope of the working curve of added series is greater than that of unadded series. By obtaining the distance between this position and the origin, and taking it as a correction factor for zero-order approximation, tabulation of the analytical value, in the case of β>α, is carried out. One parameter of the calculation is deleted by normalizing the spectral intensity; therefore, the tabulation can be simplified.

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