ABSTRACT
Objective: To investigate the oil yield, components and antimicrobial activity of the essential oil of Cinnamomi Cortex from different growth environments and growth years. Methods: Cinnamon oil was extracted by steam distillation, the chemical components were separated and identified by GC-MS, and the relative content of each component was determined by area normalization. The diameter of the inhibition zone and the minimum inhibitory concentration (MIC) were measured using filter paper method and micro dilution method. The antimicrobial effect of seven copies of cinnamon oil on three common pathogens of respiratory tract were evaluated. Results: The highest oil yield was 10-year-old cinnamon (6.41%), the lowest was 20-year-old (1.75%), and sparse planting (4.48%) was the best among 15-year-old cinnamon. A total of 44 compounds were identified in the seven samples. The major common components with a relative content of more than 1% were trans-cinnamaldehyde (16.23%-73.08%), α-copaene (7.39%-41.70%), β-cadinene (2.22%-12.30%), and α-muurolene (1.00%-9.16%). The antibacterial experiments showed that essential oil of cinnamon from different growth environments and growth years had obvious inhibitory effect on the tested strains of Staphylococcus aureus and Escherichia coli, but weaker inhibitory effect on Pseudomonas aeruginosa. Among them, volatile oil of 15-year-old sparse planting and close planting cinnamon had better antimicrobial activity. Conclusion: Oil yield, essential oils components and antimicrobial activity of cinnamon were affected by growth environments and growth years. Cinnamon oil contains other effective antimicrobial components besides cinnamaldehyde and α-copaene.
ABSTRACT
Pterodon emarginatus Vogel, Fabaceae, is a tree species commonly known as "sucupira-branca". It is a popular medicinal plant in the Brazilian cerrado (Savanna). This study investigates the chemical variability of the essential oils from fruits of P. emarginatus. The fruits were collected from five sites in the Brazilian Cerrado and their essential oils were analyzed by GC/MS. The results obtained by Principal Component and Cluster Analysis identified two groups: cluster I containing β-caryophyllene and δ-elemene and cluster II containing α-copaene, β-cubebene, allo-aromadendrene, α-cubebene and γ-muurulene. The Canonical Discriminant Analysis was used to differentiate between clusters on the basis of essential oil composition. The results showed high variability in the composition of the essential oils from fruits of P. emarginatus, contributing to studies of domestication of this species.
ABSTRACT
The essential oils of the leaves and branches of Sextonia rubra were obtained by hydrodistillation and analyzed by GC-FID and GC-MS. In the leaves were identified as the major constituents α-pinene (21.7%), β-pinene (15.4%), α-copaene (12.5%) and germacrene D (12.1%). In the branches essential oil, α-copaene (22.9%), β-selinene (7.9%) and β-elemene (7.2%) were identified as the most abundant constituents. This paper describes for the first time the composition of these essential oils.
Os óleos essenciais das folhas e galhos de Sextonia rubra foram obtidos por hidrodestilação e analisados por cromatografia em fase gasosa com detectores de ionização de chama e espectrometria de massas. O α-pineno (21,7%), β-pineno (15,4%), α-copaeno (12,5%) e o germacreno D (12,1%) foram identificados como constituintes majoritários no óleo essencial das folhas. No óleo essencial dos galhos foram identificados como constituintes majoritários o α-copaeno (22,9%), β-selineno (7,9%) e o β-elemeno (7,2%). A composição química destes óleos essenciais está sendo relatada pela primeira vez neste trabalho.