Lipoxygenase (LOX) and hydroperoxytrienoic acid lyase (HPL) activities were determined in tomato juice from four cultivars of processing tomatoes. Large differences in total activity levels were found between different cultivars. Thermal inactivation kinetics of these two enzymes were determined for two cultivars used in cold break processing. LOX inactivation did not follow simple first order ...

Reduction kinetics of the methylene green (MG) with ascorbic acid (AA) in acidic medium at max 660 nm was monitored through visible spectrophotomtry in absence and presence of sodium carbonate. CO2 release through reaction of sodium carbonate and oxalic acid, created deoxygenated atmosphere for reduction of dye which greatly boosted the reaction rate. Initially slow reaction in presence of atm...

This contribution presents results on the parameter estimation of rate constants and optical response factors in a reduced order surface kinetics ~ROSK! model, which has been developed to describe the decomposition kinetics of the organometallic precursors involved and their incorporation into the film deposition. As a real-time characterization technique, we applied p-polarized reflectance spe...

The kinetics of the oxidation of Ru (III) catalyzed oxidation of tartaric acid by potassium bromate in aqueous perchloric acid medium at constant ionic strength was investigated in the temperature range 303318 K. The reactions exhibit first order kinetics at low concentration of bromate, tending to zero order at high concentration. Zero order kinetics with respect to [tartaric acid] and first o...

The recreational drug gamma-hydroxybutyrate (GHB) has a short plasma elimination half-life (t(1/2)) reported to be about 30-50 min. However, this represents a terminal half-life and therefore might not necessarily apply after large (abuse) doses are taken. Clinical studies with sodium oxybate (sodium salt of GHB) suggest that zero-order rather than first-order kinetics are more appropriate to d...