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A carboxyl-selective fluorescence label, 9H-fluoren-2-yl-diazomethane (FDAM, 6) for the detection of carboxyl groups specifically in polysaccharides and low-molecular weight carbohydrates has been developed. Attached in a pre-column derivatization step, the label allows detection of minute amounts of oxidized functionalities in oligosaccharides and cellulosics under the relatively harsh conditions of GPC separation in the DMAc/LiCl eluant and without any fluorescence interference with light scattering (MALLS) detection, so that carboxyl profiles of polysaccharides were obtained for the first time. Synthetic carbohydrate model compounds (1-3) were used to optimize the labeling reaction.
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Kosma et al. (2005) studied this question.
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