Browsing by Author "Kisiriko, Musa"

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    The first comprehensive chemical profiling of Vachellia gummifera (Willd.) Kyal. & Boatwr., a plant with medicinal value
    (Wiley, 2024-03-19) Kisiriko, Musa; Noleto-Dias, Clarice; Bitchagno, Gabin T. M.; Naboulsi, Imane; Anastasiadi, Maria; Terry, Leon A.; Sobeh, Mansour; Beale, Michael H.; Ward, Jane L.
    Vachellia gummifera (Willd.) Kyal. & Boatwr. is a medicinal plant endemic to Morocco that has no documented studies on its chemical composition. In this study, the chemical composition of the water/methanol (4 : 1) extracts of air-dried leaf and stem samples of Moroccan V. gummifera was determined using UHPLC-MS and NMR. In total, over 100 metabolites were identified in our study. Pinitol was the major compound in both the leaf and stem extracts, being significantly more abundant in the former. Asparagine and 3-hydroxyheteroendrin were the second most abundant compounds in the stem and leaf extracts, respectively, though both compounds were present in each tissue. The other compounds included flavonoids based on quercetin, and phenolic derivatives. Eucomic acid, only identified in the stems and was the major aromatic compound distinguishing the leaf and stem profiles. Quercetin 3-O-(6′′-O-malonyl)-β-D-glucopyranoside was identified as the major flavonoid in the leaves but was also present in the stems. Other malonylated derivatives that were all flavonol glycosides based on myricetin, kaempferol, and isorhamnetin in addition to quercetin were also identified. This is the first report of eucomic acid and malonylated compounds in Vachellia species. This report provides valuable insights into the chemotaxonomic significance of the Vachellia genus.
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    Phenolics from medicinal and aromatic plants: characterisation and potential as biostimulants and bioprotectants
    (MDPI, 2021-10-20) Kisiriko, Musa; Anastasiadi, Maria; Terry, Leon A; Yasri, Abdelaziz; Beale, Michael Henry; Ward, Jane Louise
    Biostimulants and bioprotectants are derived from natural sources and can enhance crop growth and protect crops from pests and pathogens, respectively. They have attracted much attention in the past few decades and contribute to a more sustainable and eco-friendly agricultural system. Despite not having been explored extensively, plant extracts and their component secondary metabolites, including phenolic compounds have been shown to have biostimulant effects on plants, including enhancement of growth attributes and yield, as well as bioprotectant effects, including antimicrobial, insecticidal, herbicidal and nematicidal effects. Medicinal and aromatic plants are widely distributed all over the world and are abundant sources of phenolic compounds. This paper reviews the characterisation of phenolic compounds and extracts from medicinal and aromatic plants, including a brief overview of their extraction, phytochemical screening and methods of analysis. The second part of the review highlights the potential for use of phenolic compounds and extracts as biostimulants and bioprotectants in agriculture as well as some of the challenges related to their use.
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    The untargeted metabolomic analysis of Ammodaucus leucotrichus Coss. & Dur. seeds reveals previously undescribed polar lignans and terpenoids
    (Elsevier, 2025-02-01) Kisiriko, Musa; Bitchagno, Gabin T. M.; Noleto-Dias, Clarice; Naboulsi, Imane; Anastasiadi, Maria; Terry, Leon A.; Sobeh, Mansour; Beale, Michael H.; Ward, Jane L.
    The polar metabolome of the medicinal plant Ammodaucus leucotrichus Coss. & Dur. has not been comprehensively characterised. In this study, the chemical composition of a water/methanol (4:1) extract of seeds was determined through a combination of UHPLC-MS and NMR techniques. Sixty compounds were identified from the extract with 36 of these confirmed using UHPLC-MS and/or NMR data while the remaining 24 were given putative identifications based on UHPLC-MS data. The compounds included lignans, terpenes, phenolics, flavonoids, and alkaloid derivatives together with some amino- and organic acids. Of these 2 terpenoids and 3 lignans were found to be novel and were isolated and structures determined by comprehensive NMR studies. A further novel lignan glycoside was tentatively identified. Together these data represent the most comprehensive profile of this traditional medicinal plant, providing an annotated profile that can form the basis of future correlative metabolomic investigations to determine active principles behind its reported bioactivities.