Development of 7-(N,N-dimethylaminosulfonyl)-5-N-(4-N- aminoethyl)piperazino-2,1,3-benzoxadiazole as a water-soluble fluorogenic reagent for the sensitive liquid chromatographic determination of saturated carboxylic acids

The Analyst ◽  
2002 ◽  
Vol 127 (6) ◽  
pp. 741-747 ◽  
Author(s):  
Cheng Zhi Huang ◽  
Tomofumi Santa ◽  
Kazuhiro Imai
Keyword(s):  
Carboxylic Acids ◽  
Chromatographic Determination ◽  
Water Soluble ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

1-Pyrenyldiazomethane as a fluorescent labeling reagent for liquid chromatographic determination of carboxylic acids

1988 ◽  
Vol 60 (19) ◽  
pp. 2067-2070 ◽  
Author(s):  
Noriyuki. Nimura ◽  
Toshio. Kinoshita ◽  
Tsuguchika. Yoshida ◽  
Atsuhiro. Uetake ◽  
Chie. Nakai
Keyword(s):  
Carboxylic Acids ◽  
Chromatographic Determination ◽  
Fluorescent Labeling ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Direct Gas-Liquid Chromatographic Determination of Water-Soluble Vitamin K3 in Feed Premixes

1972 ◽  
Vol 55 (6) ◽  
pp. 1219-1222
Author(s):  
Victor W Winkler ◽  
John M Yoder
Keyword(s):  
Gas Chromatography ◽  
Chromatographic Analysis ◽  
Chromatographic Determination ◽  
Water Soluble ◽  
Vitamin K3 ◽  
Water Soluble Vitamin ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic ◽  
Pyrolytic Product

Abstract A method for the quantitative determination of menadione bisulfite addition products in feed premixes is presented. The menadione bisulfite compound is extracted with methanol from the premix and is determined by gas chromatography directly without pretreatment with alkali. The principle of the method is on-column pyrolysis of menadione bisulfite and subsequent gas chromatographic analysis of the pyrolytic product, menadione.

Liquid Chromatographic Determination of Nitrogen Derived from Urea and Water-Soluble Methylene Ureas in Urea Formaldehyde Fertilizers: Collaborative Study II

1984 ◽  
Vol 67 (4) ◽  
pp. 768-770
Author(s):  
Allan D Davidson ◽  
◽  
C Barry ◽  
J Carmany ◽  
A F Grigor ◽  
...  
Keyword(s):  
Urea Formaldehyde ◽  
Collaborative Study ◽  
Chromatographic Determination ◽  
Water Soluble ◽  
Paired Samples ◽  
Coefficients Of Variation ◽  
Liquid Chromatographic Determination ◽  
Aoac Official ◽  
Liquid Chromatographic

Abstract A second collaborative study with 6 collaborators was conducted on the AOAC official first action method for measuring nitrogen derived from urea, methylenediurea (MDU), and dimethylenetriurea (DMTU). No variations were made. The collaborators made single determinations on 2 separate days on 5 sets of paired samples. The mean coefficients of variation for the completed study were 4.22% for urea, 5.08% for MDU, and 5.48% for DMTU, which are only slightly higher than the values reported in the first study: urea, 3.24%; MDU, 3.48%; and DMTU, 6.56%. The method has been adopted official final action.

Liquid Chromatographic Determination Of Polydextrose In Food Matrixes

1990 ◽  
Vol 73 (1) ◽  
pp. 51-53
Author(s):  
James B Noffsinger ◽  
Martha Emery ◽  
Daniel J Hoch ◽  
Jarmila Dokladalova
Keyword(s):  
Coefficient Of Variation ◽  
Accurate Determination ◽  
Colorimetric Method ◽  
Food Product ◽  
Chromatographic Determination ◽  
Water Soluble ◽  
Liquid Chromatographic Determination ◽  
Assay Precision ◽  
Liquid Chromatographic

Abstract A liquid chromatographic (LC) method has been developed to determine the content of polydextrose, a water-soluble 1 calorie/g bulking agent, in food matrixes such as cookies, cakes, fruit spreads, and chocolate toppings. This analysis, which requires use of a blank matrix, provides a feasible means to control the manufacture of foods containing this additive and provides a component for the accurate determination of the caloric value of a particular food product. The method involves aqueous extraction of the polydextrose from the food matrix followed by separation on a carbohydrate analysis column. The LC system uses a mobile phase of 0.005M CaS04*2H2o and a refractive index detector for quantitation. Polydextrose recoveries from the food matrixes varied from 91.5 to 100.9% with assay precision, expressed as coefficient of variation, ranging from 0.7 to 4.3%. Each error estimate was derived from 5 parallel determinations. The present methodology is precise and selective in contrast to the modified classical phenol-sulfuric acid colorimetric method for assaying carbohydrates, which had been used for polydextrose determination in food matrixes in the past. Because the coefficient of variation frequently exceeded 10%, replicate analyses were necessary to achieve quantitation.

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