Control of schistosomiasis mansoni in ravena (Sabará, State of Minas Gerais, Brazil) through Water supply and quadrennial treatments

In this study, the results obtained in a control programme of schistosomiasis in Ravena (Sabará, Minas Gerais) between 1980 and 1992 are evaluated. Control measures used in this programme were: specific treatment of the people infected with Schistosoma mansoni at four year-intervals (1980/84/88) and the supply of tap water to 90% of the residences in 1980. A significant reduction of the prevalence (36.7% to 11.5%, p < 0.05) and of the intensity of the infection (228.9 eggs per gram of feces (epg), s = 3.7 to 60.3 epg, s = 3.5, p < 0.05) was observed. No cases of the severe form of the disease were diagnosed in the area. Factors independently associated with the infection were in 1980 daily sand extraction and the lack of tap water in residences and in 1992 daily sand extraction and fishing and weekly swimming. Concluding, the supply of tap water together with quadrennial treatments significantly diminished both the prevalence and intensity of the S. mansoni infection, with the additional gain of persistent low indices even after four-year intervals between the treatments.

Desenvolvimento de método analítico por CLAE em comprimidos de Benznidazol para a Doença de Chagas

The analytical method of high performance liquid chromatography (HPLC) for the assay of benznidazole in tablets was developed and validated following the requirements of regulatory agencies. The method used as mobile phase acetonitrile:wather 1:1, a C18 column of 12.5 cm length x 4 mm id, 5 mm particles and lambda=316 nm. The statistical analysis of the results demonstrated that the method satisfies all parameters so as to be considered a safe and efficient analytical alternative of low cost for laboratory routine.

Development of dissolution method for benznidazole tablets

The aim of this work was the development of a dissolution method for benznidazole (BNZ) tablets. Three different types of dissolution media, two stirring speeds and apparatus 2 (paddle) were used. The accomplishment of the drug dissolution profiles was compared through the dissolution efficiency. The assay was performed by spectrophotometry at 324 nm. The better conditions were: sodium chloride\hydrochloride acid buffer pH 1.2 with stirring speed of 75 rpm, volume of 900 mL and paddle as apparatus. Ahead of the results it can be concluded that the method developed consists in an efficient alternative for assays of dissolution for benznidazole tablets.

Development of new dissolution test and HPLC-RP method for anti-parasitic ornidazole coated tablets

This work aimed the development and validation of a new dissolution test for ornidazole coated tablets. The dissolution conditions were determined after testing Sink conditions, dissolution medium, apparatus, stirring speed, 24 h stability and medium filtration influence. The best conditions were paddle at a stirring speed of 75 rpm and 900 mL of 0.1 M HCl. A new HPLC quantification method was developed and validated. The dissolution test and quantification method showed to be adequate for their purposes and could be applied for quality control of ornidazole coated tablets, since there is no official monograph.

Desenvolvimento de método analítico para quantificação do efavirenz por espectrofotometria no UV-Vis

An UV-Vis spectrophotometry analytical method for quantifying Efavirenz was developed and validated as an alternative to replace the HPLC current method. The report method presents sample concentration of 10 μg mL-1, dissolved in a solution ethanol:water (60:40, v/v), economic and technically adequate for the purpose adopted. The results and the statistical treated proved that the method being considered an precise and accurate analytical low cost alternative for laboratory routine. The adaptability of this method in product and other analytical methods development has been challenged by mathematical calculation of drug extinction coefficient in water and methanol and practical experiments, showing interesting results.

Improving the solubility of the antichagasic drug benznidazole through formation of inclusion complexes with cyclodextrins

This study describes unpublished research on improving the solubility of benznidazole by the formation of an inclusion complex. The cyclodextrins selected were αCD, βCD, γCD, HPβCD, RMβCD and SBβCD. All complexes were obtained in solution, presenting 1:1 stoichiometry according to the phase solubility diagram. The highest association constants were obtained with RMβCD and SBβCD, being selected for attainment of solid state complexes. These were characterized using XRD, SEM and dissolution test. The data obtained suggest the formation of complexes and indicate that these may provide a promising alternative way of developing solid doses of drug with suitable biopharmaceutical properties.

Esquistossomose hepatoesplênica cirúrgica: histopatologia hepatica e endoscopia digestiva alta em crianças comparadas a adultos

Objetivando melhor compreender a fisiopatologia da esquistossomose grave em adultos e crianças, avaliaram-se diferenças histopatológicas do fígado e do padrão de endoscopia digestiva entre esses pacientes. Vinte e um adultos e igual número de crianças foram incluídos no estudo. Todos foram submetidos a esplenectomia e ligadura da veia gástrica esquerda. Os achados histopatológicos foram avaliados em secções de biópsia hepática. Utilizou-se videoendoscópio para endoscopia digestiva. Nos adultos foram encontradas: 1 - fibrose de Symmers, grau I, em um paciente; grau II, em sete; e grau III, em treze; 2 - atividade inflamatória mínima em cinco; leve, em sete; moderada, em seis; e intensa, em um; ausência de atividade inflamatória, em dois; 3 - mínima granulomatose, em quatro pacientes; moderada, em dois; ausência de granulomas, em quinze; 4 - pigmento esquistossomótico mínimo, em quatro pacientes; moderada, em um; ausência, em dezesseis. Nas crianças, foram encontradas: 1 - fibrose de Symmers, grau I, em um paciente; grau II, em quatro e grau III, em dezesseis; 2 - atividade inflamatória mínima, em sete pacientes; leve, em quatorze; 3 - mínima granulomatose, em seis pacientes; leve, em cinco; moderada, em dois; ausência, em oito; 4 - pigmento esquistossomótico mínimo, em seis pacientes; leve, em três; moderada, em seis; ausência, em seis. Na endoscopia digestiva alta encontrou-se nos adultos: oito (38%) com varizes de médio calibre e treze (62%), de grosso calibre. Oito pacientes (38%) tiveram varizes de fórnix gástrico e cinco (24%), da cárdia. Gastropatia da hipertensão porta foi diagnosticada em dezesseis pacientes (76%). Com relação às crianças, quatro (19%) apresentaram varizes de fino calibre, oito (38%) de médio; e nove (43%) de grosso calibre. Três (14%) tiveram varizes gástricas, sendo duas no fórnix e uma no cárdia. Nove (43%) das crianças apresentavam gastropatia de hipertensão porta. Os achados evidenciaram uma histopatologia hepática similar nos dois grupos; entretanto, as repercussões hemodinâmicas da hipertensão porta foram mais importantes nos adultos, sem, no entanto, alcançar significação estatística.