A new spectrophotometric method for the determination of fluvoxamine maleate in pure form and in pharmaceutical formulation.

A simple, accurate and highly sensitive spectrophotometric methods are proposed for the rapid and accurate determination of fluvoxamine maleate (FXA) using bromocressol green (BCG), methyl orange (MO) and bromothymol blue (BTB). The developed methods involve formation of stable yellow colored chloroform extractable ion-associate complexes of the amino derivative (basic nitrogen) of the FXA with three sulphonphthalein acid dyes, namely; BCG, MO and BTB, in potassium hydrogen phthalate buffer pH 3.3, 3.6 and 3.4 respectively. The ion-associates exhibit absorption maxima at 420, 420 and 410 nm for BCG, MO and BTB, respectively. FXA can be determined up to 2.0–16, 2.0–15 and 2.0–20 μgmL−1 for BCG, MO and BTB, respectively. The effect of optimum conditions via pH on the ion pair formation, reagent concentration, time and temperature, and solvent was studied. The composition of the ion pairs was found 1:1 by Job’s method. The low relative standard deviation values indicate good precision and high recovery values. These methods have been successfully applied for the assay of FXA in pure form and in pharmaceutical formulations and the results are in good agreement with those obtained by the official method.

Extractive spectrophotometric methods for nebivolol hydrochloride.

Two simple and sensitive spectrophotometric methods have been developed for the estimation of Nebivolol hydrochloride in pure and pharmaceutical dosage forms. Method 1 is based on Ion-association complex formation of the drug with (SBT λmax 515 nm). Method 2 is based on Ion-association complex formation of the drug reacts with (BTB λmax 410nm). These methods have been statistically evaluated and found to be precise and accurate.

Identificación de Cryptococcus neoformans var. neoformans en aislamientos clínicos cubanos

Mediante la utilización del medio de canavanina-glicina-azul de bromotimol (CGB), se estudiaron 50 cepas de Cryptococcus neoformans de origen clínico. El 56 % de las cepas se aisló de pacientes con sida y el 16 % pertenecía a pacientes sometidos a transplante renal. El 90 % de las cepas se obtuvo a partir de muestras de líquido cefalorraquídeo, lo que se corresponde con la forma clásica de presentación de la criptococosis. Todas las cepas se identificaron como C. neoformans var. neoformans, lo que coincide con reportes anteriores realizados en Cuba. Con el conocimiento de las variedades de C. neoformans se pueden hacer inferencias sobre la epidemiología, la clínica y la respuesta al tratamiento de la criptococosis.

50 strains of Cryptococcus neoformans of clinical origin were studied by using the canavanine-glycine-bromothymol blue (CGB) medium. 56 % of the strains were isolated from AIDS patients, and 16 % belonmged to patients with kidney transplantation. 90 % of the samples were obtained from the samples of cerebrospinal fluid, which corresponded to the classical form of presentation of cryptococcosis. All the strains were identified as C. neoformans var. neoformans, coincidings with previous reports made in Cuba. Knowing the varieties of C. neoformans, inferences can be drawn on the epidemiology, clinics and response to the treatment of criptococcosis.

Content De termination of Ephedrine Hydrochloride in Xiaoqingiong Oral Liquid / 中成药

Isolate the ephedrine from other compositions in Xiaoqinglong Oral Liquid with the steam distillation utilizing its volatility* then determine the ephedrine hydro-chloride content in this preparation with bromothymol blue colorimetry.The methods are accurate and their results are satisfactory. It is suggested that they could be used in quality control for the preparation.