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26 results on '"Ogunbinu, A. O."'

18. Essential Oil-Bearing Plants from Nigeria: Studies on Vernonia perrottettii (Leaf and Stem Bark), Young Leaves from Eucalyptus decaisneana and Immature Leaves of Hyptis suaveolens.

Author

Ogunbinu, Akinola O., Okeniyi, Sunday O., Flamini, Guido, Cioni, Pier K., Ogunwande, Isiaka A., and Olayinka, E. T.

Subjects
*ESSENTIAL oils, *VERNONIA, *EUCALYPTUS, *HYDROCARBONS
Abstract

The essential oils from four medicinal plants from Nigeria were obtained by hydrodistillation and analyzed by means of GC and GC/MS. The main constituents of the leaf and stem oils of Vernonia perrottettii Sch. Bip. (Asteraceae) were sesquiterpene hydrocarbons (92.1%) with abundance of β-caryophyllene (28.1% & 39.8%) and germacrene D (34.5% & 16.0%) in the leaf and stem oils, respectively. On the other hand, the leaf oil of Eucalyptus decaisneana Sm. (Myrtaceae) was dominated by the monoterpeue hydrocarbons (90.6%) with α-phellandrene (31.1%), p-cymeue (20.8%) and γ-terpinene (11.7%) being present in large quantities. The oil composition of immature leaf of Hyptis suaveolens L. (Lamiaceae) revealed the abundance of β-caryophyllene (22.3%), α-phellaudrene (10.6%) and caryophyllene oxide (10.3%). The compositional pattern may probably lead to the delineation of a new chemotype of this species. [ABSTRACT FROM AUTHOR]

Published
2009
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19. Analysis of the Essential Oil of Dialium guineense Willd.

Author

Essien, Emmanuel, Ogunwande, Isiaka A., Ogunbinu, AKinola O., Flamini, Guido, and Cioni, Pier L.

Subjects
ESSENTIAL oils, TREES, PLANTS, MOLLUSCICIDES
Abstract

The essential oil of Dialium guineense Willd., grown in Nigeria has been studied by GC and GC/MS. Precocene I (78.8%) was the most singly abundant constituent, with a significant proportion of β-caryophyllene (5.3%). With the exception of valencene and cadalene, all other constituents were present in amount less than 1%. The large content of precocene I in the oil is of taxonomic interest. [ABSTRACT FROM AUTHOR]

Published
2007
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20. Sesquiterpenes-Rich Essential Oils of Polyalthia longifolia Thw. (Annonaceae) from Nigeria.

Author

Ogunbinu, Akinola O., Ogunwande, Isiaka A., Essien, Emmanuel, Cioni, Pier L., and Flamini, Guido

Subjects
*ANNONACEAE, *COMPOSITION of leaves, *PLANT stems, *VEGETABLE oils, *ESSENTIAL oils
Abstract

The essential oils of the leaf and stem bark of Polyalthia longifolia Thw. (Annonaceae) have been studied for their constituents by means of GC and GC/MS. The leaf oil was almost exclusively composed of sesquiterpene derivatives, being represented by allo-aromadendrene (19.7%), caryophyllene oxide (14.4%), β-caryophyllene (13.0%), β-selinene (7.9%), α-humulene (7.0%) and ar-curcumene (6.8%). However, α-copaene and α-muurolol (ca. 8.7%), β-selinene (8.6%), viridiflorene (8.1%), α-guaiene (7.8%), allo-aromadendrene (7.4%) and δ-cadinene (7.0%) were the major constituents occurring in the oil of the bark sample. All the other sesquiterpenoid compounds were observed in amount greater than 1%. α-Pinene (0.5%) and camphene (tr), which are the two monoterpenoids present in the leaf oil, could not be detected from the bark essential oil. [ABSTRACT FROM AUTHOR]

Published
2007
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24. Eclipta indica L. (Asteraceae): A source of 2-Tridecanone.

Author

Ogunbinu, Akinola O., Ogunwande, Isiaka A., Cioni, Pier L., and Flamini, G.

Subjects
*ESSENTIAL oils, *LEAVES, *ASTERACEAE, *KETONES, *OXIDES
Abstract

The volatile oil obtained by hydrodistillation from the leaf of Eclipta indica L. was analyzed for its constituents by means of GC and GC/MS. 2-Tridecanone (89.7%), a straight chain ketone, was the singly most abundant constituent. Caryophyllene oxide (3.9%) and β-caryophyllene (2.6%) were the other compounds occurring in sizeable proportions. [ABSTRACT FROM AUTHOR]

Published
2007
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25. Constituents of Cajanus Cajan(L.) Millsp., Moringa OleiferaLam., Heliotropium IndicumL. and Bidens PilosaL. from Nigeria

Author

Ogunbinu, Akinola O., Flamini, Guido, Cioni, Pier L., Adebayo, Muritala A., and Ogunwande, Isiaka A.

Abstract

The essential oils of four plant species from Nigeria have been extracted by hydrodistillation and analyzed by GC and GC-MS. The oils of Cajanus cajanwere comprised of sesquiterpenes (92.5%, 81.2% and 94.3% respectively in the leaves, stem and seeds). The major compounds identified were α-himachalene (9.0-11.5%), β-himachalene (8.0-11.0%), γ-himachalene (6.9-8.1%), α-humulene (7.1-8.7%) and α-copaene (4.5-5.6%). However, monoterpenoid compounds (81.8%) dominated the oil of Moringa oleiferawith an abundance of α-phellandrene (25.2%) and p-cymene (24.9%). On the other hand, aldehydes (52.8%) occurred in the highest amount in Heliotropium indicum, represented by phenylacetaldehyde (22.2%), (E)-2-nonenal (8.3%) and (E, Z)-2-nonadienal (6.1%), with a significant quantity of hexahydrofarnesylacetone (8.4%). The leaf and stem oils of Bidens pilosawere dominated by sesquiterpenes (82.3% and 59.3%, respectively). The main compounds in the leaf oil were caryophyllene oxide (37.0%), β-caryophyllene (10.5%) and humulene oxide (6.0%), while the stem oils had an abundance of hexahydrofarnesyl acetone (13.4%), δ-cadinene (12.0%) and caryophyllene oxide (11.0%). The observed chemical patterns differ considerably from previous investigations.

Published
2009
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26. Essential Oil Constituents of Eclipta Prostrata(L.) L. and Vernonia amygdalinaDelile#

Author

Ogunbinu, Akinola O., Flamini, Guido, Cioni, Pier L., Ogunwande, Isiaka A., and Okeniyi, Sunday O.

Abstract

The chemical composition of the essential oils from the leaves and stem bark of Eclipta prostrata(L.) L. and the aerial parts of Vernonia amygdalinaDelile (Asteraceae) have been analyzed by capillary gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS). The investigation led to the identification of 33 and 30 compounds in the oils of the leaves and stem of E. prostrate, respectively, and 40 compounds in the oil of V. amygdalina. While the oil of the leaves of E. prostratawas highly dominated by sesquiterpenoids (89.3%), the stem bark was comprised of sesquiteprenoids (47.7%), straight chain hydrocarbons (25.6%) and monoterpenoids (11.1%). The main constituents of both oils were β-caryophyllene (47.7% and 15.9%) and α-humulene (31.8 and 12.9%) in the leaves and stem, respectively. In addition, (E)-β-farnesene (10.0%) was also identified in significant amount in the stem bark. On the other hand, the major component of V. amygdalinaoil was α-muurolol (45.7%).

Published
2009
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