Development and validation of an ultrasound-assisted surfactant-enhanced emulsification microextraction method for liquid chromatographic determination of carbamate residues in fruit juices

2015 ◽  
Vol 27 (1) ◽  
pp. 127-145 ◽  
Author(s):  
J. Vichapong ◽  
R. Burakham
Keyword(s):  
Chromatographic Determination ◽  
Fruit Juices ◽  
Liquid Chromatographic Determination ◽  
Ultrasound Assisted ◽  
Emulsification Microextraction ◽  
Development And Validation ◽  
Liquid Chromatographic

Liquid Chromatographic Determination of Hydroxymethylfurfural in Fruit Juices and Concentrates After Separation on Two Columns

1984 ◽  
Vol 67 (6) ◽  
pp. 1037-1039
Author(s):  
Johannes J L Cilliers ◽  
Pieter J Van Niekerk
Keyword(s):  
Mobile Phase ◽  
Barbituric Acid ◽  
Chromatographic Determination ◽  
Fruit Juices ◽  
Aqueous Methanol ◽  
Reverse Phase ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic ◽  
No Sample Preparation

Abstract A liquid chromatographic (LC) method is described for the detection and quantitation of 5-hydroxymethyl-2-furaIdehyde (HMF) in fruit juices and juice concentrates. HMF is separated by chromatography in 2 dimensions with different reverse phase columns. The first column is eluted with aqueous solvents, 5% methanol-2.5% acetonitrile-1.5% tetrahydrofuran (1 + 1 + 1). By using an electrically driven, 6-port valve, the collected impure HMF fraction is rechromatographed on the second column with 5% aqueous methanol as mobile phase. The compound was detected at 284 nm under conditions selected to separate HMF in 26 min with very little or no sample preparation. On a series of samples, this method gave lower values than did the colorimetric toluidine-barbituric acid method.

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