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Improved determination of milk oligosaccharides using a single derivatization with anthranilic acid and separation by reversed-phase high-performance liquid chromatography

J Chromatogr A. 2009 Feb 27;1216(9):1520-3. doi: 10.1016/j.chroma.2009.01.015. Epub 2009 Jan 15.

Abstract

An improved analytical scheme for human milk neutral oligosaccharides determination was developed, in which, the oligosaccharides were pooled in two fractions (pools 1 and 2) after gel filtration, and then were quantitatively derivatized with a single fluorescent reagent, 2-anthranilic acid. Separation was by reversed-phase HPLC on an ODS-100Z column with a mobile phase of 50 mM ammonium acetate pH 4.0 and 150 mM citrate buffer pH 4.5 and monitored by a fluorescence detector at 360nm excitation and 425 nm emission wavelengths. The method improved on the separation of neutral tetra- and hexa-saccharide isomers, namely, lacto-N-tetraose (LNT) and lacto-N-neotetraose (LNnT) as well as of lacto-N-difucohexaose I (LNDFH I) and lacto-N-difucohexaose II (LNDFH II). The separation of trisacccharide isomers, 3-fucosyllactose (3-FL) and 2'-fucosyllactose (2'-FL) was also successful. Limits of detection and quantification were in the range of 1-10 ng/l and 2-30 ng/l, respectively. The methods' accuracy was good with its precision at <20% RSD and <1% RSD, respectively, for oligosaccharide concentration and retention time. The recoveries were in the range of 80-100%. This method was successfully applied to the separation and determination of representative neutral oligosaccharide contents in Samoa women milk.

MeSH terms

  • Chromatography, High Pressure Liquid / methods*
  • Humans
  • Milk, Human / chemistry*
  • Oligosaccharides / analysis*
  • Reproducibility of Results
  • Sensitivity and Specificity
  • ortho-Aminobenzoates / chemistry

Substances

  • Oligosaccharides
  • ortho-Aminobenzoates
  • anthranilic acid