A note on the losses of monosaccharides, amino sugars, and amino acids from extracts during concentration procedures

The reproducibility of recovery of components in organic extracts may be improved by the addition of a small quantity of glycerin prior to concentration techniques such as freeze-drying or rotary evaporation to dryness. Various biological and geological samples have been analyzed for three different groups of natural hydrophilic organics using modern liquid chromatographic systems in order to examine this effect in detail.