Palladium/neocuproine catalyzed oxidation of glucosides shows an excellent selectivity for the C3-OH, but in mannosides and galactosides, unselective oxidation was initially observed. For further application in more-complex (oligo)saccharides, a better understanding of the reaction, in terms of selectivity and reactivity, is required. Therefore, a panel of different glycosides was synthesized, ...

Prior to preparation of CRM candidate of chloramphenicol in methanol with a concentration of 100 mg/L, two independent methods including mass balance (MB) and quantitative nuclear magnetic resonance (qNMR) were employed to precisely measure the mass fraction of pure chloramphenicol materials. The mass fraction was assigned to be 99.8% with uncertainty of 0.3%. Homogeneity testing and stability ...

The analysis of Celandine extracts (Chelidonium majus L.) by 1H NMR method makes it possible to identify the main alkaloids – derivatives phenanthridine, protoberberin and protopin, use qNMR provides information with satisfactory accuracy about content these alkaloids. determined in composition (0.35%) is 2 times lower than when using spectrophotometric determination procedure described GF Russ...