The Experts below are selected from a list of 759 Experts worldwide ranked by ideXlab platform
Ikhlas A Khan - One of the best experts on this subject based on the ideXlab platform.
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Two undescribed paradol-related specialized metabolites from Aframomum melegueta.
Natural product research, 2020Co-Authors: Zhihao Zhang, Fazila Zulfiqar, Zulfiqar Ali, Ikhlas A KhanAbstract:Aframomum melegueta seeds are widely used as a spice in Africa. Two undescribed paradol-related compounds, (S)-9-hydroxy-[6]-paradol (1) and (9S)-3,9-dihydroxydihydro-[6]-paradol (2) together with eight reported constituents (3-10) were isolated and characterised from the methanol extract of A. melegueta seeds. Structure elucidation of these metabolites was achieved by means of NMR and mass spectroscopic data analyses. The absolute configuration of undescribed compounds (1 and 2) was determined using the modified Mosher's method.
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Two undescribed paradol-related specialized metabolites from Aframomum melegueta.
Natural product research, 2020Co-Authors: Zhihao Zhang, Fazila Zulfiqar, Zulfiqar Ali, Ikhlas A KhanAbstract:Aframomum melegueta seeds are widely used as a spice in Africa. Two undescribed paradol-related compounds, (S)−9-hydroxy-[6]-paradol (1) and (9S)−3,9-dihydroxydihydro-[6]-paradol (2) together with ...
Donald A Ukeh - One of the best experts on this subject based on the ideXlab platform.
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alligator pepper Aframomum melegueta and ginger zingiber officinale reduce stored maize infestation by the maize weevil sitophilus zeamais in traditional african granaries
Crop Protection, 2012Co-Authors: Donald A Ukeh, Alan S Bowman, Jennifer A Mordue, Sylvia B.a. Umoetok, J. A. Pickett, Michael Alexander BirkettAbstract:Abstract Alligator pepper, Aframomum melegueta (Roscoe) K. Schum, and ginger, Zingiber officinale Roscoe were tested for their efficacy in protecting stored maize cobs ( Zea mays L.) against the maize weevil, Sitophilus zeamais Motschulsky, in traditional maize storage barn conditions, from November 2006 to February 2007, and November 2009 to February 2010 in Obudu, Southeast Nigeria. A randomised complete block design was used in each storage barn with four treatments (maize, maize plus A. melegueta , maize plus Z. officinale , maize plus A. melegueta and Z. officinale ) replicated 4 times. When used in combination with stored maize cobs at a level of 10% (w/w), A. melegueta and Z. officinale significantly reduced S. zeamais populations from cobs ( P A. melegueta and Z. officinal e (5% w/w each, P P
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Behavioural and olfactory responses of Sitophilus zeamais (Coleoptera: Curculionidae) to Aframomum melegueta and Zingiber officinale oleoresins.
Global Journal of Pure and Applied Sciences, 2010Co-Authors: Donald A Ukeh, Sylvia B.a. Umoetok, Khalid AbdullahAbstract:The oleoresins extracted from the seeds of alligator pepper, Aframomum melegueta and ginger, Zingiber officinale rhizome using methanol, was evaluated for bioactivity against the maize weevil, Sitophilus zeamais in the laboratory. Using a 4-arm olfactometer, solutions of the oleoresins at a concentration of 1 mg/ml exhibited significant olfactory repellent activity against male and female S. zeamais when tested alone, and in combination with maize seeds. These findings provide a scientific basis for the observed repellent properties of the oleoresins and demonstrate the need for their development in stored product pest protection in Africa where these plants are readily available. KEYWORDS: Oleoresin, Aframomum melegueta, Zingiber officinale, Sitophilus zeamais , Olfactometer.
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repellent activity of alligator pepper Aframomum melegueta and ginger zingiber officinale against the maize weevil sitophilus zeamais
Phytochemistry, 2009Co-Authors: Donald A Ukeh, Alan S Bowman, J. A. Pickett, Michael Alexander Birkett, Jennifer A MordueAbstract:Abstract The repellent activity of alligator pepper, Aframomum melegueta , and ginger, Zingiber officinale (Zingiberaceae), against the maize weevil, Sitophilus zeamais (Coleoptera: Curculionidae), was investigated in four-way olfactometer bioassays. Results showed that vacuum distilled A. melegueta and Z. officinale extracts were repellent towards adult S. zeamais both in the absence and the presence of maize, Zea mays , grains. Bioassay-guided liquid chromatographic fractionation of the distillates showed that fractions containing oxygenated compounds accounted for the repellent activity. Coupled gas chromatography–mass spectrometry (GC–MS), followed by GC peak enhancement and enantioselective GC using authentic compounds, identified 3 major compounds in the behaviourally active fractions of A. melegueta and Z. officinale to be ( S )-2-heptanol, ( S )-2-heptyl acetate and ( R )-linalool in a ratio of 1:6:3, and 1,8-cineole, neral and geranial in a ratio of 5.48:1:2.13, respectively. The identification of these behaviourally active compounds provides the scientific basis for the observed repellent properties of A. melegueta and Z. officinale , and demonstrates the potential for their use in stored-product protection at the small-scale farmer level in Africa.
Zhihao Zhang - One of the best experts on this subject based on the ideXlab platform.
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Two undescribed paradol-related specialized metabolites from Aframomum melegueta.
Natural product research, 2020Co-Authors: Zhihao Zhang, Fazila Zulfiqar, Zulfiqar Ali, Ikhlas A KhanAbstract:Aframomum melegueta seeds are widely used as a spice in Africa. Two undescribed paradol-related compounds, (S)-9-hydroxy-[6]-paradol (1) and (9S)-3,9-dihydroxydihydro-[6]-paradol (2) together with eight reported constituents (3-10) were isolated and characterised from the methanol extract of A. melegueta seeds. Structure elucidation of these metabolites was achieved by means of NMR and mass spectroscopic data analyses. The absolute configuration of undescribed compounds (1 and 2) was determined using the modified Mosher's method.
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Two undescribed paradol-related specialized metabolites from Aframomum melegueta.
Natural product research, 2020Co-Authors: Zhihao Zhang, Fazila Zulfiqar, Zulfiqar Ali, Ikhlas A KhanAbstract:Aframomum melegueta seeds are widely used as a spice in Africa. Two undescribed paradol-related compounds, (S)−9-hydroxy-[6]-paradol (1) and (9S)−3,9-dihydroxydihydro-[6]-paradol (2) together with ...
Fazila Zulfiqar - One of the best experts on this subject based on the ideXlab platform.
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Two undescribed paradol-related specialized metabolites from Aframomum melegueta.
Natural product research, 2020Co-Authors: Zhihao Zhang, Fazila Zulfiqar, Zulfiqar Ali, Ikhlas A KhanAbstract:Aframomum melegueta seeds are widely used as a spice in Africa. Two undescribed paradol-related compounds, (S)-9-hydroxy-[6]-paradol (1) and (9S)-3,9-dihydroxydihydro-[6]-paradol (2) together with eight reported constituents (3-10) were isolated and characterised from the methanol extract of A. melegueta seeds. Structure elucidation of these metabolites was achieved by means of NMR and mass spectroscopic data analyses. The absolute configuration of undescribed compounds (1 and 2) was determined using the modified Mosher's method.
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Two undescribed paradol-related specialized metabolites from Aframomum melegueta.
Natural product research, 2020Co-Authors: Zhihao Zhang, Fazila Zulfiqar, Zulfiqar Ali, Ikhlas A KhanAbstract:Aframomum melegueta seeds are widely used as a spice in Africa. Two undescribed paradol-related compounds, (S)−9-hydroxy-[6]-paradol (1) and (9S)−3,9-dihydroxydihydro-[6]-paradol (2) together with ...
Zulfiqar Ali - One of the best experts on this subject based on the ideXlab platform.
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Two undescribed paradol-related specialized metabolites from Aframomum melegueta.
Natural product research, 2020Co-Authors: Zhihao Zhang, Fazila Zulfiqar, Zulfiqar Ali, Ikhlas A KhanAbstract:Aframomum melegueta seeds are widely used as a spice in Africa. Two undescribed paradol-related compounds, (S)-9-hydroxy-[6]-paradol (1) and (9S)-3,9-dihydroxydihydro-[6]-paradol (2) together with eight reported constituents (3-10) were isolated and characterised from the methanol extract of A. melegueta seeds. Structure elucidation of these metabolites was achieved by means of NMR and mass spectroscopic data analyses. The absolute configuration of undescribed compounds (1 and 2) was determined using the modified Mosher's method.
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Two undescribed paradol-related specialized metabolites from Aframomum melegueta.
Natural product research, 2020Co-Authors: Zhihao Zhang, Fazila Zulfiqar, Zulfiqar Ali, Ikhlas A KhanAbstract:Aframomum melegueta seeds are widely used as a spice in Africa. Two undescribed paradol-related compounds, (S)−9-hydroxy-[6]-paradol (1) and (9S)−3,9-dihydroxydihydro-[6]-paradol (2) together with ...
