University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Ice cream

Classification: Food -> dessert -> ice cream

Citations 2

"Continuous-flow And Liquid Chromatographic Determination Of P-toluenesulfonamide In Ice-cream: Inter-laboratory Study"
J. AOAC Int. 1993 Volume 76, Issue 3 Pages 570-574
Beljaars, P.R.;Van Dijk, R.;Brands, A.

Abstract: In the cited collaborative study samples were extracted with water and the extracts were cleaned-up by dialysis in the continuous-flow system. The dialysates were analyzed on a column (10 cm x 3 mm) of C18 (5 µm) equipped with a pre-column (1 cm x 3 mm) of similar material with aqueous 25% methanol as mobile phase (0.5 mL min-1) and fluorimetric detection at 295 nm (excitation at 230 nm). Seven samples containing 6.35 mg kg-1 of p-toluenesulfonamide were analyzed by eleven laboratories. Repeatability coefficient of variation were 2.1 to 3.7% and reproducibility coefficient of variation were 7.8 to 11.7%. No false-positive results were reported for a blank sample and no interference was encountered by the presence of vanilla in samples.
p-toluenesulfonamide HPLC Fluorescence Interferences Dialysis

"Determination Of P-toluenesulfonamide In Ice Cream By Combination Of Continuous-flow And Liquid Chromatography: Summary Of Collaborative Study"
J. AOAC Int. 1994 Volume 77, Issue 3 Pages 672-674
Beljaars, P.R.;Van Dijk, R.;Brands, A.

Abstract: The collaborative study undertaken has been described previously (Ibid., 1993, 76, 570). Melted ice cream was homogenized and dialysed in the continuous-flow system (diagram given). p-Toluenesulfonamide was then separated by online LC on a stainless-steel column (10 cm x 3 mm i.d.) of C18 (5 µm) equipped with a guard column (10 cm x 3 mm i.d.) of the same material, with aqueous 75% methanol as mobile phase (flow rate not given) and fluorimetric detection at 295 nm (excitation at 230 nm). No interference was caused by the presence of vanillin in the samples. Seven ice cream samples were analyzed by 11 laboratories. Repeatability and reproducibility RSD ranged from 2.08-3.67% and 7.79-11.68%, respectively. Average recoveries were 63-101% and no false positive results were reported for the sample. The method was adopted first action by AOAC International.
p-Toluenesulfonamide LC Interferences