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Evaluación preliminar de la actividad hipoglicemiante en ratones diabéticos por aloxano y capacidad antioxidante in vitro de extractos de Bauhinia kalbreyeri Harms
PRELIMINARY EVALUATION OF HYPOGLYCEMIC ACTIVITY IN DIABETIC MICE AND IN VITRO ANTIOXIDANT ACTIVITY OF Bauhinia kalbreyeri HARMS EXTRACTS
Keywords:
Bauhinia kalbreyeri, diabetes, actividad hipoglicemiante, actividad antioxidante, radical libre DPPH (es)Bauhinia kalbreyeri, diabetes, hypoglycemic activity, antioxidant activity, free radical DPPH. (en)
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Bauhinia kalbreyeri (casco de vaca) es una planta tropical de la familia Caesalpinaceae. Sus hojas sirvieron de base para obtener un extracto etanólico con el cual se realizaron dos bioensayos con el fin de determinar la actividad hipoglicemiante de la planta. El estudio se complementó evaluando la actividad antioxidante por el método del radical libre DPPH y realizando un análisis fitoquímico preliminar. La diabetes se indujo en ratones normoglicémicos mediante la administración de aloxano en dosis de 75 mg/Kg. Los animales que resultaron diabéticos fueron asignados a diferentes grupos para ser sometidos a tratamiento con el extracto (1.000 mg/Kg), el disolvente de los tratamientos (control), la tolbutamida (patrón, vía oral) y la insulina (vía subcutánea). En los bioensayos se realizaron comparaciones mediante un análisis de varianza (ANOVA). La dosis única de 1.000 mg/Kg no disminuyó los niveles de glucosa sanguínea en ratones con diabetes tipo I (insulino dependiente). No obstante, los extractos etanólicos y acuosos de hoja y corteza de la planta mostraron capacidad atrapadora de radicales libres comparable al ácido ascórbico, utilizado como patrón. La actividad antioxidante de los extractos podría estar relacionada con el uso de la planta como antidiabético dado en la etnobotánica y ser consecuencia de la abundante cantidad de metabolitos tipo fenólico encontrados.
Bauhinia kalbreyeri (“cow hofâ€), is a tropical plant included in the family Caesalpinaceae. In this work, an ethanolic was obtained. From this extract two bioassays were carried out in order to determine the hypoglycemic action of plant. The study was complemented evaluating the antioxidant activity by the DPPH free radical method and carrying out a preliminary phytochemical analysis. The diabetes was induced in normoglycemic mice by means of aloxane administration in dose of 75 mg/Kg. The diabetic animals were assigned to different groups to be subjected to treatment with the extract (1.000 mg/Kg), the vehicle (control), the tolbutamide (pattern, per os) and the insulin (via subcutaneous). In those bioassays was carried out comparisons by means of a variance analysis (ANOVA). The unique dose of 1.000 mg/Kg did not present antidiabetic activity in mice with diabetes type I (insulin dependent). Nevertheless, the ethanolic and aqueous extracts of leaf and bark showed free radical scavenging capacity comparable to ascorbic acid, which was used as pattern. The antioxidant activity of extracts could be related with the ethnopharmacology use of Bauhinia kalbreyeri as antidiabetic, and being consequence of the abundant presence of phenolic-like compounds detected.
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Copyright (c) 2006 Revista Colombiana de Ciencias Químico-Farmacéuticas

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