The use of novel mass spectrometric techniques, off-line coupled to chromatographic techniques is described in order to obtain molecular mass information of compounds present in complex mixtures of oligosaccharides. Such information could be quite useful in studies where pure and well-defined enzymes are used to study the chemical fine structure of polysaccharides. Post source decay fragmentati...

The process of drug delivery and disposition in the modern scientific aspect is very complex. Advances in many fields are converging to make the commercialisation of advanced drug delivery concepts possible. It integrates many disciplines, including biotechnology, medicine and pharmacology. Innovative devices should protect labile active ingredients, precisely control drug release kinetics and ...

A rapid and simple method for the determination of sulfate involving a complex formation between inorganic sulfate and the dye, toluidine blue 0, after chromatography, is presented. The method can be used for the determination of sulfate in the presence of interfering ions such as phosphate and citrate. Most of the ions have a different chromatographic migration in the solvent system employed. ...

Open-shell phosphanyl complexes (OC)5W{(Me3Si)2HCP(X)} (X = F, H), obtained by one-electron oxidation of lithium phosphanido complexes, were trapped by TEMPO to yield novel thermally labile P-nitroxyl phosphane complexes. First experimental evidence for an open-shell P-F phosphanoxyl complex (OC)5W{(Me3Si)2HCP(O)F}, formed upon thermolysis of corresponding P-nitroxyl derivative, is reported; re...

Small molecule S-nitrosothiols are a class of endogenous chemicals in the body, which have been implicated in a variety of biological functions. However, the labile nature of NO and the limits of current detection assays have made studying these molecules difficult. Here we present a method for detecting trace concentrations of S-nitrosothiols in biological fluids. Capacitive sensors when coupl...

The genes for a new enterotoxin were cloned from Escherichia coli SA53. The new toxin was heat labile and activated adenylate cyclase but was not neutralized by antisera against cholera toxin or E. coli heat-labile enterotoxin. Subcloning and minicell experiments indicated that the toxin is composed of two polypeptide subunits that are encoded by two genes. The two toxin subunits exhibited mobi...