Abstract The extraction, and stability of polyphenols from the grape residue were studied. extractions performed following Box-Behnken design, surface response methodology was used to model extraction total anthocyanins (TA), flavonols (TF), phenolics (TP). optimized simultaneously by desirability function. degradation kinetics monomeric anthocyanins, increase in polymeric color modeled under r...

Polysaccharides are of great interest to scientists due their special properties such as non-toxicity, specific physical and chemical properties, therapeutic effects, biodegradability, biocompatibility. In recent years, research has been intensively conducted on the isolation polysaccharides from natural raw materials by conventional non-conventional methods, determine structure biological acti...

phosphoryl containing ligand tri-n-octylphosphine oxide (topo) in dichloromethane has been used as an extracting agent for tetravalent thorium and trivalent europium ions from their 1 m sodium nitrates. the equilibrium data reveal that both ions are extracted as the complexes at 1:3 metal/ligand ratio. the values of conditional extraction equilibrium constant (kex) show the superior extractive ...