Anti-oxidant and Antimicrobial Flavonoid Glycosides from Alstonia boonei De Wild Leaves

Journal Title: Journal of Pharmaceutical Research International - Year 2016, Vol 10, Issue 6

Abstract

Aims: Alstonia boonei De Wild (Apocynaceae) leaves are used traditionally in several parts of West Africa (including Nigeria) and Asia for the treatment of various ailments such as rheumatic and muscular pains as well as hypertension and malaria. The aim of this study is to isolate the phytoconstituents responsible for its anti-oxidant and anti-inflammatory activities. Methodology: The leaves of Alstonia boonei were extracted in methanol and the methanol extracted subjected to series of chromatographic separation for the isolation of 8 flavonoid glycosides. The chemical structures of these compounds were elucidated by a combination of UV, HPLC-MS, 1 D and 2 D NMR spectroscopy. The antioxidant activity of the isolated flavonoid glycosides was determined by DPPH free radical scavenging model while the antimicrobial activity was determined by Agar well diffusion technique. Results: The flavonoid glycosides were elucidated as Rutin (1), Quercetin robinobioside (2), Kaempferol-3-O-rutinoside (3), Kaempferol-3-O-robinobioside (4) and compounds 5, 7 and 8 which are glycosides of quercetin and compound 8 which is a flavonoid of kaempferol. Compounds 1, 2, 5, 7 and 8 which are all glycosides of quercetin showed good antioxidant activities (IC50 ˂66 μg/mL) on DPPH free radical scavenging model. Compounds 3, 4 and 6 which are derivatives of kaempferol, however, showed poor activity (IC50 >200 μg/mL). Of all the compounds, only 7 and 8 were active against Escherichia coli with IZD (inhibition zone diameter) values of 17 and 13 mm at 62.5 μg/mL respectively. Conclusion: The profound antioxidant activity of the isolated quercetin derivatives may explain the ethnomedicinal use of the plant extracts in the management of inflammatory diseases and other disorders associated with oxidative stress.

Authors and Affiliations

Nkeoma N. Okoye, Chukwuma O. B. Okoye

Keywords

Related Articles

Activity Guided Fractionation of Ethanol Extract of Meriandra bengalensis against Anopheles Mosquito Larvae

Aim: To prevent proliferation of mosquito borne diseases, to improve quality of life, mosquito control is essential. Research was aimed to find alternative eco-friendly and bio-degradable strategies in mosquito control a...

Trend of HIV Seropositivity among Children at Teaching Tertiary Care Hospital in North India

Aim: The aim of this study is to ascertain the burden and trend of HIV sero-positivity among children attending ICTC in a teaching tertiary care hospital. Study Design: Retrospective study. Methodology: HIV seropositivit...

Evaluation of Ampicillin and Ceftriaxone on Ethanol Consumption as Compared to Naltrexone in Alcohol Dependant Rats

Context: Extracellular glutamate level in reward centre of brain increases during ethanol drinking sessions. Hence, it can be hypothesized that drugs which decrease extracellular glutamate might have deaddictive properti...

Adverse Drug Reactions of Anti-hypertensives in Medicine Department of A Tertiary Care Hospital: A Twelve Month Observation

Background: Cardiovascular diseases are one of the leading causes of mortality and morbidity around the globe. Hypertension is directly responsible for 57% of all stroke deaths and 24% of all coronary heart disease death...

Primary Unresponsiveness to Pioglitazone is not Related to PPAR-ϒ and Its Co-activator Gene Exon SNP Markers

The objective of this prospective observational study was to assess inter-individual variations in lipid and glycemic response to pioglitazone (30 mg OD) and their predictors in newly diagnosed T2DM patients. Out of 104...

Download PDF file
  • EP ID EP342459
  • DOI 10.9734/BJPR/2016/24809
  • Views 93
  • Downloads 0

How To Cite

Nkeoma N. Okoye, Chukwuma O. B. Okoye (2016). Anti-oxidant and Antimicrobial Flavonoid Glycosides from Alstonia boonei De Wild Leaves. Journal of Pharmaceutical Research International, 10(6), 1-9. https://europub.co.uk/articles/-A-342459