In the present research work absorption characteristics of rifaximin was studied and validated in different solvents visible region for its quantitative estimation bulk dosage forms by UV spectrophotometric method. The solution Rifaximin were prepared 0.1N HCL (pH 1.2), Phosphate buffer 6.8) & 7.4) showed maximum at wavelength 439 nm, 440 nm 433 respective solvents. drug obeyed Beer–Lambert...

When Rhodobacter sphaeroides was resuspended in sodium phosphate buffer directly after growth on complete medium there was an almost complete loss of motility. The addition of 1 mM sodium phosphate to R. sphaeroides suspended in Hepes buffer also caused an immediate reduction in the mean swimming speed of 35%; an effect that was maintained for more than 60 rain. This loss of motility was preven...

and discriminative in vitro release in pH 6.8 [B] physiological bicarbonate buffer compared to [A] compendial phosphate buffer for enteric coated formulations

A method, using capillary electrophoresis (CE) with laser-induced fluorescence (LIF) detection for analyzing chitin oligosaccharides is described. Chitin oligosaccharides were derivatized with 9-aminopyrene-1,4,6-trisulfonate (APTS) via reductive amination at 37 degrees C for 16 h (optimized conditions). The APTS-chitin oligosaccharides were analyzed using either an acidic citric acid-phosphate...

It is a well-known fact that sirolimus (SRL) undergoes degradation process via hydrolysis in aqueous media, leading to incorrect assessment of drug amount and thus release characteristics of formulations. The main objective of the present study was to evaluate the effect of nonionic surfactants in media on in-vitro release profiles for sirolimus eluting stents (SES) coated with biodegradable po...

Dunaliella tertiolecta required carbon dioxide in substrate concentrations (1.75 %, v/v) to assimilate either nitrate or nitrite at maximum rates in light. The addition of glucose, glycerol, acetate, pyruvate or a-ketoglutarate did not remove the requirement for carbon dioxide. The rates of nitrate and nitrite assimilation in light depended upon the buffer system used. The lowest rates of nitra...

NADH could not be freeze-stored at -25°C in 50 mMsodium phosphate buffer (pH range 6-8 20°C) without serious loss of the nucleotide; however, no losses were seen upon freeze storage in 50 mM-Hepes buffer (pH range 7-8, 20°C). The rate of NADH degradation was greater (approx. 2-fold) in 50 mMthan in 5 mM-sodium phosphate buffer, although NADH values at both buffer concentrations were similar (5%...