Evaluation of Binding Properties of Selected Natural Mucilages

529-532Mucilages from Asparagus racemosus and Cassia sophera were isolated by maceration technique using water as solvent and precipitated by the addition of acetone, used as non-solvent. The percentage yields of mucilages front the selected sources were 11 and 20 per cent, respectively. Both the mucilages were evaluated for their granulating and binding properties in tablets, using paracetamol as model drug. The mucilages were used at three different concentrations, i.e., 8, 9 and 10 per cent, respectively. Wet granulation technique was used for preparation of granules. The prepared granules were evaluated for percentage of fines, particle size, and flow properties. The properties were compared with starch. The tablets were punched by using a Cadmach single punch machine and were evaluated for content uniformity, hardness, friability, disintegration time, and in vitro dissolution profiles. The tablets had good physical properties and the drug release was more than 90 per cent within 3 h. The tablets prepared using 10 per cent mucilage as binder exhibited more hardness than 8 and 9 per cent batches. Hence, 8 and 9 per cent concentrations can be considered as ideal concentrations for preparation of tablets

Electrochemical behaviour of 1-anilinomalonyl- 3-methyl-4-(substituted benzeneazo)-5-Pyrazolones

53-55Electrochemical reduction of 1-anilinomalonyl-3- methyl-4-(substituted benzeneazo )-5-pyrazolones (Ia-d) has been carried out in Britton-Robinson buffers in the pH range of 2-10. All the compounds give single, well-defined, diffusion-controlled, irreversible reduction wave at d.m.e. and well-defined cathodic peak at hanging drop mercury electrode. Based on the results obtained from polarography, cyclic voltammetry and microcoulornetry, a plausible mechanism has been suggested

Electrochemical behaviour of N'-(2pyridine carbonyl)-3-methyl-4-( 4'substituted benzeneazo )-2pyrazoline- 5-ones

895-896The electrochemical reduction of N'-(2-pyridine carbonyl)-3-methyl-4-(4’-substituted benzeneazo)-2-pyrazolin- 5-ones has been carried out in the pH range 2.10-10.10 at mercury cathode in 40% (v/v) dimethylformamide. A single four-electron diffusion-controlled irreversible wave is observed. Based on the results obtained from polarography, cyclic voltammetry and micro-coulometry, a mechanism has been suggested for the reduction of the title compounds

Electrochemical behavior of 3-amino-1-phenyl-4- substituted benzene-azo)pyrazolin-5ones

864-8663-Amino-1-phenyl-4-(substituted benzeneazo)pyrazolin-5-ones (I) exhibit a well-defined reduction wave at dme in d.c polarography and a well-defined cathodic peak at hanging mercury drop electrode in cyclic voltammetry in the pH range of 2.10-10.10. The products of electrolysis have been characterised by spectral and chemical methods and a plausible mechanism of electroreduction of  I has been suggested

ALTERED SPECTRAL PROPERTIES OF PHOTOSYNTHETIC APPARATUS IN THE CYANOBACTERIUM, SYNECHOCOCCUS 6301 UNDER INFLUENCE OF PHOTOINHIBITION

ABSTRACT: In this investigation an attempt has been made to develop spectral properties of cyanobacteria as an indicator to identify the high light stress ). High light caused alterations in the absorption as well as fluorescence emission properties of phycocyanin and stopped the energy transfer to photosystem II in cyanobacterium, Synechococcus 6301.Chlorophyll fluorescence measurements proved that the existence of inhibitor site near reducing of photosystem II

Tb3+ added sulfamic acid single crystals with optimal photoluminescence properties for opto-electric devices

Terbium doped Sulfamic Acid (Tb3+:SA) single crystals were grown successfully by the slow evaporation solution (SEST) technique and the unidirectional method. The lattice parameters and the functional group were identified for the grown crystal by using single crystal X-ray diffraction and Fourier transform infra-red spectroscopy (FTIR), respectively. High resolution X-ray diffraction analysis (HRXRD) shows the crystalline perfection of the grown crystal. The optical transparency and band gap of the grown crystals were determined from UV-VIS spectroscopy. TG/DTA studies reveal that the grown crystals are thermally stable up to 190 °C. The frequency dependent dielectric properties were studied at different temperatures. Vickers micro hardness studies show that Tb3+:SA belongs to the class of soft materials. Second harmonic generation efficiency of Tb3+:SA is 3.7 times that of pure KDP. The photoluminescence emission and excitation studies of Tb3+:SA single crystals indicated the green emission at 543 nm, which is due to a transition from the 5D4 excited state to the 7F5 ground state