Kamlesh Kumari

Effect of storage conditions of egg on rheological properties of liquid whole egg.

In the present work the effect of storage conditions of egg on rheological properties of Liquid Whole Egg (LWE) prepared from stored eggs were evaluated using a Brookfield. Newtonian model and Ostwald-of-Waele (Power Law) model were fitted to the rheological data obtained by experiments, both represented a good adjustment to the rheological data. The Newtonian model has shown an R2value between 0.984 and 0.993 (P < 0.05) and 0.991 and 0.995 (P < 0.05) for LWE samples prepared from eggs stored at room temperatures and refrigerated temperatures. The Ostwald-of-Waele (Power Law) resulted in the best adjustment, presenting an average R2 values higher than 0.99 in all the cases and further statistical analysis showed that power law model was appropriate to explain the correct rheological behaviour of LWE prepared from stored eggs. All the LWE samples showed pseudoplastic and thixiotropic behaviour in the experimental conditions.

Characterization and application of methylcellulose and potato starch blended films in controlled release of urea

Abstract Biodegradable blended films from methylcellulose (MC) and potato starch (PST) have been developed by the casting process. In the present work the influences of concentrations of MC and PST on rheological properties, swelling, mechanical properties such as tensile strength, percentage elongation at break and water vapor transmission rate (WVTR) of the prepared blended films have been studied. Fourier transform infrared (FTIR) analysis of pure MC, PST, their mixture and the mixture with glutaraldehyde and urea was performed to investigate the interactions in blended films. The blended films of MC and PST showed an increase in tensile strength due to the cross linking reactions of the amylopectin molecule of PST in the physical gel state. The change of percentage elongation at break increased with MC concentration and the opposite trend was found in the case of the WVTR due to the network structure of the blended films. The blended films showed a large improvement in the abovementioned properties compared with each single component, due to the interaction formed between hydroxyl groups of PST and the methoxy groups of MC. Experiments were also conducted to investigate the controlled urea release through blended films and the kinetics of the process. Interesting results were found with the prepared MC and PST blended films.

Effect of drying processes and curing time of chitosan-lysine semi-IPN beads on chlorpheniramine maleate delivery.

Abstract Beads of semi-interpenetrating polymer network (semi-IPN) have been synthesized from chitosan and lysine with varying amounts of glutaraldehyde solution used as a cross-linker. The cross-linked beads are dried by different drying processes such as air-drying, oven-drying and freeze-drying. These semi-IPNs are characterized under a scanning electron microscope (SEM). Swelling studies of these beads are carried out in different pH (2.0 and 7.4) solutions. The effect of concentration of cross-linking agent and curing period on the swelling as well as on the drug release is analysed. The results indicate that the size of matrix depend on the curing time of beads, concentration of glutaraldehyde and technique of drying. The freeze-dried beads exhibit a relatively higher percentage of swelling in the range of 66–89% as compared to oven-dried beads (53–74%) and air-dried beads (39–61%). The drug loaded beads which are cured for different time intervals followed by drying are tested for in-vitro release of chlorpheniramine maleate (CPM) drug. The rate of drug release from freeze-dried beads is much faster than that from the oven-dried and air-dried beads.

Controlled Release of Urea Through Mesoporous Methylcellulose Films Derived From N, N Dimethyl Formamide

The controlled release of urea through mesoporous methylcellulose (MPMC) films with varying concentration of urea (10, 20, 40, and 50 wt%) was studied. It was found that the release of urea from methyl cellulose (MC) films take place through pores as well as through bulk of the MC matrix. The release of urea through MPMC film is independent of the initial concentration of urea. The mass of diffused urea is well fitted to the transport equations. The transport of urea is pseudo-Fickian. The optical study exhibits the compactness of the MC film at the high percentage of urea.