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Systematic significance of GC-MS analysis of Monodora Dunal. (Annonaceae) from Nigeria and the Cameroons
  • Sunday Adeniran,
  • Akeem Kadiri,
  • James Olowokudejo
Sunday Adeniran
University of Ilorin

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Akeem Kadiri
University of Lagos
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James Olowokudejo
University of Lagos
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Abstract

The comparative assessment of six (6) Monodora species occurring in Nigeria and the Cameroons was undertaken using GC-MS analysis. The analysis was carried out with methanol extract and one hundred and sixty (160) phytoconstituents were identified and scored at different retention times ranging from 3.14min to 34.69min in M. undulata (P. Beauvois) Couvreur. The results of the phytochemical constituents using methanol extract of the genus Monodora were 16.85%, 10.67%, 32.58%, 9.55%, 16.85% and 13.48% of M. angolensis Welw., M. brevipes Benth., M. crispata Engl. & Diels., M. myristica (Gaertn.) Dunal., M. zenkeri (Engl.) Dyer., and M. undulata respectively. The prominent compounds were scored in carboxylic and its derivates while the least compound was identified in alcohol and organo-compounds. Highest M.wt. was 611.62 scored M. angolensis at a retention time of 29.86 min and the lowest M.wt. was 83.13 in M. zenkeri at a retention time of 13.14 min. In UPGMA distant tree was constructed with an RMSD index to illustrate the relationships among the Monodora species based on the different chemical constituents. The scoring of two compounds named Heptasiloxane, 1,1,3,3,5,5,7,7,9,9,11,11,13,13-tetradecamethyl- and Octasiloxane, 1,1,3,3,5,5,7,7,9,9,11,11,13, 13,15,15-hexadecamethyl supported the cluster of M. myristica, M. undulata, M. angolensis and M. crispata. The highest distance value was between M. angolensis and M. myristica while the highest similarity level was scored in M. brevipes and M. zenkeri, which form a sub-cluster tree between M. zenkeri and M. brevipes. The overlapping phyto-constituents characters revealed the closeness of the taxa studied