Ginkgetin or Isoginkgetin: The Dimethylamentoflavone of Dioon edule Lindl. Leaves

Journal Title: European Journal of Medicinal Plants - Year 2016, Vol 16, Issue 3

Abstract

Aims: Phytochemical study of the biflavonoid content of Dioon edule Lindl. leaves in addition to quantification of the phenolic content and evaluation of their antioxidant potential. Methodology: Chromatographic isolation of the total alcohol extract of the leaves followed by the spectroscopic identification of the isolated compounds was performed adopting 1D, 2D NMR techniques. The total phenolic content (TPC) was determined using the Folin-Ciocalteu method and the total flavonoids content (TFC) was measured by complexation with aluminum chloride and the antioxidant activity was evaluated with DPPH (2.2-diphenyl-1-picrylhydrazyl) assay. Results: Phytochemical investigation of Dioon edule Lindl. leaves afforded the isolation of 7,4′,7″,4″′-tetramethylamentoflavone (1), 4′,4″′-dimethylamentoflavone (isoginkgetin) (2) biolbetin (3) and amentoflavone (4) in addition to β-sitosterol (5). A more accurate assignment of 13C-NMR data of the methylated amentoflavone derivatives is performed using 2D NMR (HMQC and HMBC). Compounds 2 and 5 are reported for the first time in Dioon edule Lindl. leaves. Previous report on D. edule Lindl. leaves afforded the isolation of ginkgetin (6) as a dimethylamentoflavone but our investigation proved that it is isoginkgetin. The TPC was 0.27±0.01 gallic acid equivalents in mg/g plant material. The TFC was 1.8473±0.077 rutin equivalents in mg/g plant material. The plant exhibited a good antioxidant property as DPPH scavenging activity was 3.29±0.251 mg ascorbic acid equivalent antioxidant capacity in 1 g plant material. Conclusion: The phytochemical study of D. edule Lindl. leaves afforded isoginkgetin instead of the previously reported ginkgetin. The use of NMR provides the most powerful tool for a more accurate assignment of biflavonoids.

Authors and Affiliations

Abeer Moawad, Dalia El Amir

Keywords

Related Articles

Optimization of Medium pH, Growth Media Compositions and Analysis of Nutritional Components of Ganoderma lucidum in Submerged Culture Fermentation

Aims: This study was undertaken to identify the optimal submerged culture conditions for four strains of Ganoderma lucidum: Ganoderma lucidum-8 (Ga-8), Ganoderma sinense (Ga-Sin), Ganoderma lucidum-0201 (Ga-0201) and Gan...

In vitro Antimicrobial Effect of Essential oil from Leaf and Rhizome of Various Accessions of Acorus calamus Linn., and Its Phytochemical Screening

The study was carried out to analysis phytochemical constituents and antimicrobial effect of the essential oil of the leaf and rhizome obtained from the various accessions of Acorus calamus L., collected from India. Stud...

Phytochemical and Antioxidant Properties of Stem Bark Extracts of Anthocleista nobilis

Aim: This study was carried out to determine the phytochemical and antioxidant properties of extracts of Anthocleista nobilis. Methodology: Acetone and methanol stem bark extracts of A. nobilis were investigated for thei...

Evaluation of Root Extract of Acacia nilotica on Haematological and Lipid Profile in Rats

Aim: Acacia nilotica root has been used for different medicinal purposes wherever the plant is found in Nigeria. This study was designed to evaluate the effects of Acacia nilotica aqueous root extract on hematological pa...

Pharmacological Activities of Agave seemanniana and Isolation of Three Steroidal Saponins

Aim: To investigate the analgesic, anti-inflammatory and ulceroprotective properties of Agave seemanniana methanolic leaf extract (MEAS) and its saponin containing fraction (SFAS), in animal models compared to standard d...

Download PDF file
  • EP ID EP349644
  • DOI 10.9734/EJMP/2016/28560
  • Views 108
  • Downloads 0

How To Cite

Abeer Moawad, Dalia El Amir (2016). Ginkgetin or Isoginkgetin: The Dimethylamentoflavone of Dioon edule Lindl. Leaves. European Journal of Medicinal Plants, 16(3), 1-7. https://europub.co.uk/articles/-A-349644