The effect of pH and temperature on the stability and visual colour of aqueous anthocyanin (ACY) extracts from purpleand red-flesh potatoes was evaluated and compared to commercial ACY extracts from grape and purple carrot. Extracts from purple carrot and redflesh potatoes showed higher stability than grape and purple-flesh potato extracts. Stability to pH (63) and thermal degradation of extrac...

In the present work, the effect of initial pH of methylene blue solution on the kinetics of dye sorption from synthetic aqueous solution by a natural waste material namely: orange peels, was studied. Kinetic data were measured in batch conditions. Methylene blue uptake was time contact and solution initial pH dependent. Maximum dye sorption was found to occur at initial pH 9. Two simplified kin...

Kinetic study for different start up conditions of the anaerobic digestion of wastewater derived from the sago processing from tubers of tapioca (Mannihot utillisema) is discussed. The experiment is carried out with synthetic waste water using a tapered fluidized bed reactor. Mesoporous granulated activated carbon is used as a bacterial support. The kinetic model follows half order kinetics for...

Differential equations for the kinetics of complementary replicating macromolecules in a flow reactor are derived. It is shown that such a model has many features in common with the differential equation for direct replication, the replicator equation. Two special cases of replication, and the influence of mutation on them, have been studied in detail. In the case of first-order mass action kin...

We have revisited the problem of anomalously diffusing species, modeled at the mesoscopic level using continuous time random walks, to include linear reaction dynamics. If a constant proportion of walkers are added or removed instantaneously at the start of each step then the long time asymptotic limit yields a fractional reaction-diffusion equation with a fractional order temporal derivative o...

This paper presents the feasibility of removal of MB dye from aqueous solution using activated carbon prepared from Usoro fiber (Adenia lobata). FTIR analysis revealed that many functional groups were present on the surface of the adsorbent. The adsorption Kinetics was analyzed by pseudo first order, pseudo second order and intra particle diffusion kinetics models. Results showed that MB adsorp...

The kinetics of K exchange were investigated in Ca-saturated samples from the Ap horizon of an Evesboro soil from Delaware. Biphasic kinetics characterized the first-order plots for K adsorption and desorption at 283 and 298K with the two simultaneous reactions being attributed to exchange sites with varying reactivity for K and Ca ions. The rapid reaction was ascribed to exchange sites of the ...

The aim of the present research was to prepare and evaluate a gastroretentive drug delivery system for metformin HCl, using synthetic and semi-synthetic polymers. The floating approach was applied for preparing gastroretentive tablets (GRT) and these tablets were manufactured by the direct compression method. The drug delivery system comprises of synthetic and semi-synthetic polymers such as po...

Many oncogenic mutations inactivate the tumor suppressor p53 by destabilizing it, leading to its rapid aggregation. Small molecule drugs are being developed to stabilize such mutants. The kinetics of aggregation of p53 is deceptively simple. The initial steps in the micromolar concentration range follow apparent sigmoidal sequential first-order kinetics, with rate constants k1 and k2. However, ...