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Effect of harvesting time on the production and chemical composition of tulsi leaves essential oil [electronic resource].

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Abdel-Hamid, M. F

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Language: English Summary language: Arabic Description: p.3-13Other title:

تأثير وقت الحصاد علي كمية و التركيب الكيميائي للزيت الطيار لاوراق التولزي.‪ [Added title page title]

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Annals of agricultural science, 2005 v. 50 (1) [electronic resource].

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In: Annals of Agricultural Science 2005.v.50(1)Summary: Tulsi plant (Holy basil) is a promising medicinal and aromatic plant. Tulsi seeds (Ocimum sanctum L., Lamiaceae) imported from USA have been successfully adapted, propagated and cultivated under Egyptian climatic conditions. The present study was carried out to follow up the changes in the content and chemical composition of hydro-distilled tulsi leaf essential oil throughout the different physiological stages of plant life (vegetative, flowering and seed formation stages). Oil samples were analyzed using GC and GC-MS chromatographic technique. Data clearly reveal that physiological stages have influenced markedly the concentrations of the resultant oil together with its chemical composition (qualitatively and quantitatively). However one can conclude that flowering stage is the most profitable time of harvesting tulsi leaves for the following reasons. First of all, it exhibited the highest oil concentration (0.5%) and the highest numbers of terpenes (52 terpenic compounds) compared with vegetative stage (0.19010 and 25 terpenes), and seed formation stage (0.2% and 20 terpenes). Secondly, the highest relative concentrations of eugenol, estragol and 1,8-cineol were attained during flowering stage and in turn increasing its biological activity.

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Tulsi plant (Holy basil) is a promising medicinal and aromatic plant. Tulsi seeds (Ocimum sanctum L., Lamiaceae) imported from USA have been successfully adapted, propagated and cultivated under Egyptian climatic conditions. The present study was carried out to follow up the changes in the content and chemical composition of hydro-distilled tulsi leaf essential oil throughout the different physiological stages of plant life (vegetative, flowering and seed formation stages). Oil samples were analyzed using GC and GC-MS chromatographic technique. Data clearly reveal that physiological stages have influenced markedly the concentrations of the resultant oil together with its chemical composition (qualitatively and quantitatively). However one can conclude that flowering stage is the most profitable time of harvesting tulsi leaves for the following reasons. First of all, it exhibited the highest oil concentration (0.5%) and the highest numbers of terpenes (52 terpenic compounds) compared with vegetative stage (0.19010 and 25 terpenes), and seed formation stage (0.2% and 20 terpenes). Secondly, the highest relative concentrations of eugenol, estragol and 1,8-cineol were attained during flowering stage and in turn increasing its biological activity.

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