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rev. udca actual. divulg. cient ; 21(2): 449-456, jul.-dic. 2018. tab, graf
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1094747

ABSTRACT

RESUMEN Los tubérculos andinos formaron parte de la dieta de poblaciones originarias y son considerados como alimentos de alta calidad nutricional; sin embargo, en la actualidad, su uso ha disminuido. En este estudio, se plantea, como objetivo, evaluar características funcionales (capacidad antioxidante y antimicrobiana) de dos tubérculos consumidos tradicionalmente en Colombia, cubio (Tropaeolum tuberosum) y ulluco (Ullucus tuberosus). Para esto, se recolectaron tallos, hojas y tubérculo de cubio y de ulluco, se secaron a 38°C, por 90 horas y se realizaron extractos con etanol al 50% v/v. En los extractos obtenidos, se midió la capacidad antioxidante, por las técnicas DPPH y ABTS y el efecto inhibitorio en Escherichia coli, Lactobacillus fermentum y Cándida utilis, mediante la técnica de discos. Se encontró alto porcentaje de capacidad antioxidante en todas las partes de la planta en ambos tubérculos; las que presentaron mayor actividad son hojas y tallos. En la capacidad antimicrobiana, el cubio tuvo un efecto bacteriostático sobre C. utilis, mientras que el ulluco tuvo un efecto sobre E. coli. Debido a lo anterior, estos dos tubérculos poseen potencial para la extracción de compuestos antioxidantes y antimicrobianos permitiendo, de esta manera, establecer alternativas de uso para los tubérculos y subproductos (hojas y tallos).


ABSTRACT Andean tubers formed part of the diet of native populations and are considered as foods of high nutritional quality, however today its use has waned. This study proposes to evaluate functional characteristics (antioxidant and antimicrobial capacity) of two tubers traditionally consumed in Colombia, cubio (Tropaeolum tuberosum) and ulluco (Ullucus tuberosus). For this were collected stems, leaves and tuber of cubio and ulluco, were dried up to 38°C for 90 hours, and extracts were made with ethanol 50% v/v. In the extracts was measured the antioxidant capacity by DPPH and ABTS techniques and the inhibitory effect on Escherichia coli, Lactobacillus fermentum, and Candida utilis, using the technique of discs. Found higher antioxidant capacity in all parts of the plant in both tubers, however, which showed greater activity are leaves and stems. The antimicrobial capacity, the cubio had a bacteriostatic effect on C. utilis, while the ulluco had an effect on E. coli. Due to the above, these two tubers have potential for the extraction of antioxidant compounds, antibiotics, thus allowing establish alternatives of use for tubers and by products (leaves and stems).

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