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Accueil du site → Doctorat → Arabie Saoudite → Diversity of medicinal plants traditionally used in Jeddah city in Saudi Arabia : Ethnobotanical and Phytochemical study

King Abdulaziz University (2021)

Diversity of medicinal plants traditionally used in Jeddah city in Saudi Arabia : Ethnobotanical and Phytochemical study

Alqethami, Afnan Mohammed

Titre : Diversity of medicinal plants traditionally used in Jeddah city in Saudi Arabia : Ethnobotanical and Phytochemical study

Auteur : Alqethami, Afnan Mohammed

Université de soutenance : King Abdulaziz University

Grade : Doctorate Thesis 2021

Résumé
Medicinal plants play an important role in healthcare. As a result of the growing emphasis on the use of traditional medicine, it has become important to document it before it is forgotten. Very few ethnobotanical and phytochemical studies conducted together in Saudi Arabia. Ethnobotanical knowledge in Jeddah was investigated and documented here for the first time. The present research aimed to investigate the ethnobotanical knowledge and the uses of medicinal plants in Jeddah city, Saudi Arabia. The objectives of this research were : 1- Documenting medicinal plants used. 2- Identifying the botanical species used. 3- Screening for the presence of phytochemical constituents in medicinal plants were achieved. 4- Estimating the flavonoids which have antioxidant activity of some plant extracts. Ethnobotanical fieldwork took place in Jeddah from August 2018 to September 2019. Individual free-listing, semi-structured interviews and an online survey questionnaire were carried out to document the local use of medicinal plant. In total, 50 men and 50 women were interviewed face-to-face and 344 participants responded online to the questionnaire, of which 154 were men and 190 were women. Screening of medicinal plants used was performed for the presence of alkaloids, glycosides, flavonoids, tannins, saponin and resin using standard methods. Thirty plant species were analyzed by High Performance Liquid Chromatography (HPLC) method. As a result of this work, a total of 85 different plant species (of which 38 species are present in the flora of KSA) belonging to 37 families were documented and identified. Plant uses were documented for 12 therapeutic categories. The most popular medicinal species used in Jeddah was Zingiber officinale Roscoe (130 citations), followed by Mentha spicata L. (123 citations) and Pimpinella anisum L. (88 citations). Seeds were the most abundantly utilized plant parts (29%), followed by leaves (27%) and roots (10%). Thirty-two medicinal plants (38%) have side effects. A total of 121 mixtures were documented. The most commonly distributed phytochemical compounds among medicinal plants used were glycosides (82% ; 70 species), tannins (68% ; 58 species), alkaloids (56% ; 48 species), saponins (52%, 44 species) and flavonoids (35% ; 30 species). All 30 plant species which were analyzed by HPLC method have flavonoids. Five different standards (quercetin, rutin, caffeic acid, cinnamic acid and gallic acid) were identified in 6 of them. It can be said that the ethnomedicinal importance of these plants conform to their secondary metabolite content. In addition, the results revealed that both Helianthus annuus L. and Anethum graveolens L. contained antioxidants, yet they were rarely used in folk medicine in Jeddah. Therefore, it is important to draw attention about the medicinal importance of them. In conclusion, medicinal plants occupy a significant part of healthcare in Jeddah city. Moreover, the historical, commercial and religious factors play a significant role in the diversity of medicinal plants. Therefore, documentation efforts are desperately required to avoid the extinction of this ethnobotanical heritage in Saudi Arabia. To preserve this ethnobotanical heritage of Saudi Arabia, looking forward that this kind of study has been covering all parts of Saudi Arabia by 2030 “Saudi Arabia’s Vision".

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Page publiée le 14 décembre 2022