Abstract
Celosia trigyna recognized as a known ancient vegetable unfortunately unpopular in this modern age. In this study, antioxidant activities of Celosia trigyna leaves were evaluated in crude extract (methanol) and different fractions; chloroform, hexane, methanol and ethylacetate. Antioxidant evaluation were established using total antioxidant activity (phosphomolybdeum) and antiradical scavenging activity (2,2-Diphenyl-1-Picrylhydrazyl (DPPH)) and Hydrogen Peroxide (H2O2) methods. C. trigyna leaves showed the highest values of Total phenolics content (TP) (0.162mg, Rutin equivalent per g methanol fraction) while the lowest value of TP (0.092mg ± 0.001 GAEg-1) was recorded in the chloroform fraction. Ethylacetate fraction of C. trigyna leave extract was highest (0.192 ± 0.003mg GAEg-1) in Total Antioxidant Activity. Interestingly the C. trigyna methanol fraction exhibited the highest percentage inhibition for both DPPH and H2O2 scavenging activities of 89.22% and 88.24% respectively at concentration 0.6mg/ml. All the fractions including the C. trigyna crude methanol extract showed strong scavenging activity on DPPH as the concentration increases while the scavenging activity of the C. trigyna leaves methanol extract and fractions were high at 0.6mg/ml concentration. C. trigyna is presented as an alternative natural antioxidant to synthetic antioxidants used in foods and pharmaceutical industries.
Highlights
Research focus on plants has incredibly risen all over the world and quite a several plants are discovered to have medicinal advantages especially for humans [1]
The total phenolic contents of the leaves of C. trigyna methanolic extract is 0.144mg ± 0.005 GAEg-1, hexane fraction (0.094±0.003 GAEg-1), chloroform fraction (0.092±0.001 GAEg-1), ethyl acetate fraction (0.107±0.002 GAEg-1) and methanol fraction of C. trigyna is 0.162±0.003 GAEg-1 as shown in table 1. This shows that naturally occurring antioxidants are primarily phenolics that are from all parts of plants especially from fruits and vegetables [14,15,16]
The DPPH scavenging activities of C. trigyna L leaves methanol crude extract and its fractions were presented in table 2
Summary
Research focus on plants has incredibly risen all over the world and quite a several plants are discovered to have medicinal advantages especially for humans [1]. Developing countries around the world invest immensely on traditional herbs in the treatment of diseases. Several methods are invoked to get rid of diseases and ailments which include the use of plants as herbs for prevention and cure [2]. Several medicinal plants are found around the world, this is the plant with the potency of healing; which has therapeutic effects or foundational compounds that can be synthesized for useful drugs [3]. Human has depended largely on medicinal drugs in past centuries. Though a great number of research works have been done on numerous medicinal plants especially from the Amaranthus. This study is aimed at evaluating the antioxidant activities of the crude extract of Celosia trigyna L leaf (extinction vegetable) and its fractionated extracts
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