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In vitro antioxidant properties and inhibitory effect of Plectranthus glandulosus leaves on human low-density lipoprotein oxidation
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  • Djamila Zouheira,
  • Gabriel Agbor Agbor,
  • Randhir SinghOrcid,
  • Sylviane Laure Kamani,
  • Anu Kajal,
  • Shah Farooq,
  • Sylvie Lea Ngnokam
Djamila Zouheira
University of Dschang
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Gabriel Agbor Agbor
Centre for Research on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies
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Randhir Singh
Orcid
Maharishi Markandeshwar University
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Sylviane Laure Kamani
University of Dschang
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Anu Kajal
Maharishi Markandeshwar University
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Shah Farooq
Maharishi Markandeshwar University
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Sylvie Lea Ngnokam
University of Dschang
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Abstract

Background and Purpose : Oxidation of LDL has been suggested to be an initial step in the development of atherosclerosis. This research work deals with the evaluation of antioxidant potential of Plectranthus glandulosus leaves extracts and fractions as well as its protective effects against human LDL oxidation. Experimental Approach : A preliminary quantitative phytochemical screening was carried out. Antioxidant potential was evaluated employing in vitro hydrogen peroxide, nitric oxide scavenging assays and TAOC test. The human LDL oxidation induced by CuSO4 inhibition test was also performed. Key Results : Plectranthus glandulosus leaves exhibited the presence of 18.3% of saponines, 25.6% of terpenoids and 36.2% of flavonoids. EAF exhibited highest hydrogen peroxide and nitric oxide scavenger activity (IC50 13.63µg/ml and 24.59 µg/ml respectively). Ascorbic acid exhibited an IC50 value of 15.39µg/ml in hydrogen peroxide assay and 22.96 µg/ml in nitric oxide scavenging activity. EAF exhibited a higher TAOC (optical density 0.186±0.00) than that of ascorbic acid (0.162±0.001) at the concentration of 25µg/ml while at 200µg/ml N-BUTF exhibited a higher optical density (1.261±0.001) than that of ascorbic acid (1.065±0.001). EAF lengthened the lag time of the CD formation up to 150mins at the concentration 1mg/ml. TBARS formation inhibition at the concentration 0.5mg/ml, were no significant different between n-butanol (68.55%) ethyl acetate fraction (68.21%) and quercetin 67.69%). Conclusion and Implications : Plectranthus glandulosus is a promising prospect as an anti-atherosclerotic agent and needs a detailed study to establish the same.