Open AccessIn-vitro and In-vivo Antioxidant Activity of Ethanol Leaf Extract of Justicia carnea
Author(s) -
Udedi Stanley Chidi,
Onuabuchi Nnenna Ani,
Asogwa Kingsley Kelechi,
Maduji Fitzcharles Chijindu,
Okafor Clinton Nebolisa
Publication year - 2020
Publication title -
international journal of biochemistry research and review
Language(s) - English
Resource type - Journals
ISSN - 2231-086X
DOI - 10.9734/ijbcrr/2020/v29i430185
Subject(s) - antioxidant , chemistry , ascorbic acid , dpph , lycopene , ec50 , lipid peroxidation , superoxide dismutase , catalase , food science , in vivo , biochemistry , pharmacology , in vitro , biology , microbiology and biotechnology
This study investigated the in-vitro antioxidant activity of ethanol leaf extract of Justicia carnea and its effect on antioxidant status of alloxan-induced diabetic albino rats. The in-vitro antioxidant activity was assayed by determining the total phenol, flavonoids, ascorbic acid, β-carotene and lycopene contents and by using 2,2 diphenyl-1-picrylhydrazyl (DPPH) radical, reducing antioxidant power and inhibition of lipid peroxidation antioxidant systems. Oxidative stress was produced in rats by single intraperitoneal injection of 150 mg/kg alloxan and serum concentration of malonaldehyde (MDA), superoxide dismutase (SOD) and catalase (CAT) were determined. Five experimental groups of rats (n=6) were used for the study. Two groups of diabetic rats received oral daily doses of 100 and 200 mg/kg Justicia carnea leaf extract respectively while gilbenclamide (5 mg/ml); a standard diabetic drug was also given to a specific group for 14 days. From the result, the leaf extract contained a higher concentration of flavonoids followed byphenols, ascorbic acid, lycopene and β-carotene. The extract displayed more potent reducing power ability with EC50 of 40 µg/ml compared to BHA (EC50 of 400µg/ml). The percentage DPPH radical scavenging activity of the extract was also higher with EC50 of 200µg/ml and increased with increase in concentration while BHA had EC50of 320µg/ml. The inhibition of lipid peroxidation also increased with increase in concentration with EC50 of 58µg/ml and comparable with BHA (EC50=60µg/ml). The effect of the plant extract on antioxidant enzyme activities was concentration-dependent. Administration of 100mg/kg of the plant extract resulted in a significant decrease (p 0.05) in the serum level of MDA when compared with the diabetic untreated group. These findings suggest that ethanol leaf extract of Justicia carnea have antioxidant properties and could handle diabetes-induced oxidative stress.