Quantitative Determination of Selenium in Tissues and Feces: A Photometric Method

1939 ◽  
Vol 11 (4) ◽  
pp. 198-200 ◽  
Author(s):  
Ross A. Gortner ◽  
Howard B. Lewis
Keyword(s):  
Quantitative Determination ◽  
Photometric Method

Extraction photometric method for the quantitative determination of metamizil in 0.25% solution for injection

1980 ◽  
Vol 14 (5) ◽  
pp. 350-353
Author(s):  
A. A. Bagdasaryan ◽  
L. S. Efimova ◽  
S. A. Minina ◽  
A. S. Bril'
Keyword(s):  
Quantitative Determination ◽  
Photometric Method

Quantitative Determination of Vanillin and Ethyl Vanillin in Flavors by Paper Chromatography

1964 ◽  
Vol 47 (6) ◽  
pp. 1161-1165
Author(s):  
J Fitelson
Keyword(s):  
Quantitative Determination ◽  
Paper Chromatography ◽  
Alkaline Solution ◽  
Chromatographic Separation ◽  
Chromatographic Method ◽  
Ultraviolet Absorption ◽  
Photometric Method ◽  
Absorption Method ◽  
Ethyl Vanillin

Abstract Previous methods for estimating vanillin and ethyl vanillin in mixtures were long and complicated. However, this paper presents a simple chromatographic separation and quantitative determination of these aromatics, using Mitchell equipment for paper chromatography and 8 × 8” papers. Development for 2 hours separates the compounds adequately; they are then extracted and measured by absorbances at 348 mμ in alkaline solution. Recoveries of added vanillin and ethyl vanillin to vanilla extract are excellent. Aside from normal manipulative errors, the only significant inaccuracy is caused by the small amount of natural p-hy-droxybenzaldehyde in vanilla (usually equivalent to about 5% of the vanillin content). The method does not separate p-hydroxybenzaldehyde and vanillin. Total errors in the method do not exceed 0.01%. Comparison of the method with the two AOAC methods for vanillin shows that the paper chromatographic method gives results close to those by the ultraviolet absorption method, in most cases, and significantly lower results than the photometric method, which is known to give erroneously high results.

Quantitative determination of longitudinal and transverse cross-relaxation rates

1999 ◽  
Vol 96 (9/10) ◽  
pp. 1608-1615
Author(s):  
T. E. Malliavin ◽  
H. Desvaux ◽  
M. A. Delsuc
Keyword(s):  
Quantitative Determination ◽  
Cross Relaxation ◽  
Relaxation Rates

Quantitative Determination of Gallic acid and Cyanidin-3-O-Glucoside within Sumac Extracts by HPLC-MS/MS

Planta Medica ◽  
2011 ◽  
Vol 77 (12) ◽  
Author(s):  
M Koşar ◽  
F Göger ◽  
N Kırımer ◽  
KHC Başer
Keyword(s):  
Quantitative Determination ◽  
Gallic Acid
Sign in / Sign up

Export Citation Format

Share Document