Quantitation of low molecular weight sugars by chemical derivatization-liquid chromatography/multiple reaction monitoring/mass spectrometry.
A new method for the separation and quantitation of 13 mono- and disaccharides has been developed by chemical derivatization/ultra-HPLC/negative-ion ESI-multiple-reaction monitoring MS. 3-Nitrophenylhydrazine (at 50°C for 60 min) was shown to be able to quantitatively derivatize low-molecular weight (LMW) reducing sugars. The nonreducing sugar, sucrose, was not derivatized. A pentafluorophenyl-bonded phase column was used for the chromatographic separation of the derivatized sugars. This method exhibits femtomole-level sensitivity, high precision (CVs of ≤ 4.6%) and high accuracy for the quantitation of LMW sugars in wine. Excellent linearity (R(2) ≥ 0.9993) and linear ranges of ∼500-fold for disaccharides and ∼1000-4000-fold for monosaccharides were achieved. With internal calibration ((13) C-labeled internal standards), recoveries were between 93.6% ± 1.6% (xylose) and 104.8% ± 5.2% (glucose). With external calibration, recoveries ranged from 82.5% ± 0.8% (ribulose) to 105.2% ± 2.1% (xylulose). Quantitation of sugars in two red wines and two white wines was performed using this method; quantitation of the central carbon metabolism-related carboxylic acids and tartaric acid was carried out using a previously established derivatization procedure with 3-nitrophenylhydrazine as well. The results showed that these two classes of compounds-both of which have important organoleptic properties-had different compositions in red and white wines.
Genome BC Proteomics Centre, University of Victoria, Victoria, BC, Canada.
Jun
J
Han
Genome BC Proteomics Centre, University of Victoria, Victoria, BC, Canada.
Karen
K
Lin
Genome BC Proteomics Centre, University of Victoria, Victoria, BC, Canada.
Carita
C
Sequria
Genome BC Proteomics Centre, University of Victoria, Victoria, BC, Canada.
Juncong
J
Yang
Genome BC Proteomics Centre, University of Victoria, Victoria, BC, Canada.|Department of Biochemistry and Microbiology, University of Victoria, Victoria, BC, Canada.
Christoph H
CH
Borchers
D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D057230:Limit of Detection; D013058:Mass Spectrometry / Q000379:methods*; D008970:Molecular Weight; D009005:Monosaccharides / Q000032:analysis*; D015203:Reproducibility of Results; D014920:Wine / Q000032:analysis
D009005:Monosaccharides
3-Nitrophenylhydrazine; Chemical derivatization; Low molecular weight sugars; Ultra-HPLC-multiple reaction monitoring MS; Wine