ABSTRACT
Commercial grade 2-butyne-1,4-diol has been used in electroplating for several years. In laboratory experiments, its presence in the electrolyte increases the current efficiency of zinc electro-winning. Its chemical behaviour in solution is not well known. The present paper indicates that the brownish technical grade 2-butyne-1,4-diol contains the monomer, the dimer and some trimer. Pure monomeric 2-butyne-1,4-diol is a white solid obtained by evaporation of the technical grade product. The monomer is slowly transformed into dimer and possibly into a trimer when dissolved in water. Various analytical techniques were used in the study of this system. Factor analysis with column cross-validation was applied to chromatographic data to help in the resolution of the system.
ABSTRACT
We describe "high-performance" liquid chromatography of urinary monosaccharides on a macroporous anion-exchange resin (Hitachi 3013N), with acetonitrile/water as eluent. The separated xylose, arabinose, D-fructose, mannose, galactose, and D-glucose were detected by means of a post-column reduction reaction of tetrazolium blue. Absolute limits of detection were about 10 ng of monosaccharide. Lactose can also be measured.
