B.B. Biología

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Examinando B.B. Biología por Materia "Actividad antioxidante"

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  • Miniatura
    PublicaciónAcceso abierto
    Estudio quimiotaxonómico y evaluación de la actividad antioxidante de extractos etanólicos foliares de cuatro especies del género Ficus l. (moraceae), Planeta Rica (Córdoba- Colombia).
    (2020-11-13) Furnieles Núñez, Héctor Javier; Arias Ríos, Jorge Enrique; Montaño Castañeda, Mary Cecilia
    In the taxonomy of angiosperm plants, floral characters have generally been preferred over vegetative characters, as evidenced in many of the classification, systems; however, these can vary significantly, making it difficult in some cases to identify plant species. Chemotaxonomy or chemosystematics, evaluates the presence of chemical compounds in plant species; the chemical aspect of the classification of plants is based on their constituents, that is, on their molecular characteristics; These, like morphological characteristics, are genetically controlled, but have the advantage over morphological ones, of being able to be described exactly in terms of defined structures and configurational chemical formulas. In this study, it was proposed to determine the presence of phenolic compounds (Flavonoids) in the foliar ethanolic extracts of the Ficus benjamina L; Ficus insipid Willd; Ficus elastica Roxb ex Hornem and Ficus bullenei I.M. Johnst species, in order to apply the comparative method of chemical structures and the existing taxonomic relationship between the investigated species, from the chemotaxonomic point of view. On the other hand, the antioxidant activity of the foliar ethanolic extracts of the species F. benjamina, F. insipida, F. elastica and F. bullenei was evaluated, using the methods DPPH• (2,2- Diphenyl-1picrilhidrazil), ABTS+• (Acid 2,2'-azino-bis (3-ethylbenzothiazoline-6 sulphonic)) and FRAP (Iron Reduction Antioxidant Potential). For this, a range of working concentrations between 1 and 6 mg / L was established for all extracts. The IC50 values determined by the DPPH• method were 5.4 mg/L, 4.8 mg/L, 2.4 mg/L and 3.9 mg/L, respectively. For the ABTS+• method, the IC50 values calculated were 2.9 mg/L, 2.8mg/L, 3.7mg/L and 3.0 mg/L, for each species respectively. For these two methods 6-hydroxy-2, 5, 7, 8-tetramethylchroman-2-carboxylic acid (Tolox) was used as a reference. The FRAP method was used with a concentration range between 1 and 5 mg/L. All the foliar ethanolic extracts evaluated presented iron reduction potential, the most active being the extract of the Ficus elastica species and the one with the lowest potential against the TPTZ complex, was the foliar EtOH extract of the F. bullenei species, compared to the substance of reference (Gallic acid).
  • Miniatura
    PublicaciónAcceso abierto
    Evaluación de la actividad antioxidante de hermodice carunculata (polychaeta: amphinomidae) en ambientes protegido y expuesto al oleaje en Isla Fuerte, Caribe colombiano
    (2020-11-14) Guerra Salcedo, Ester Acsami; Santafe Patiño, Gilmar; Quirós Rodríguez, Jorge Alexander
    The fireworm Hermodice carunculata PALLAS, 1766 belongs to the family amphinomidae, is characterized by its hive bite and the presence of calcified quetas that cover its entire body, however, its aposematic coloration is the most striking of this species. These organisms have varied and bright colors and some can reach large size. With this work, antioxidant activity was evaluated by the methods of the radical DPPH• and ABTS+• of the primary methabolic extract of the species Hermodice carunculata of exposed environment and protected from the swell, collected in dry and rainy season, by means of free search and manually. Antioxidant activity was determined to have no significant results (IC50 > 1000 mg/ml), but IC5O values allowed the study to be brought to comparison of extracts by the possibility of active secondary metabolites. The mean inhibitory concentration (IC50) had variations between the two sectors, so that those in exposed environments were considered "better activity" as they had lower concentration than the rest. On the other hand, these values were influenced by the action of the swell, the values furthest from the activity, were associated with the low impact environments of the waves, therefore, the effect of temperature and precipitation was added to it, also the coloration and size was a fundamental factor to attribute it to the antioxidant activity of Hermodice carunculata. It was proven through an analysis of main components that yellow and large specimens had low activity compared to those of brown and smaller size.