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5231119 
Journal Article 
Components of the essential oils of Azadirachta indica A. Juss, Azadirachta siamensis Velton, and Azadirachta excelsa (Jack) Jacobs and their comparison 
Kurose, K; Yatagai, M 
2005 
1 
Journal of Wood Science
ISSN: 1435-0211
EISSN: 1611-4663 
51 
2 
185-188 
WOS:000229840900016 
The components of the essential oils from seeds of Azadirachta indica, Azadirachta siamensis, and Azadirachta excelsa were studied by gas chromatography and Gas chromatography-mass spectrometry. The main components of A. indica oil were hexadecanoic acid (34.0%), oleic acid (15.7%), 5,6-dihydro-2,4,6-triethyl-(4H)-1,3,5-dithiazine (11.7%), methyl oleate (3.8%), and eudesm-7(11)-en-4-ol (2.7%). The major components of A. siamensis oil were hexadecanoic acid (52.2%), tricosane (10.5%), tetradecanoic acid (6.8%), oleic acid (4.9%), and pentacosane (4.9%). Azadirachta excelsa oil contained oleic acid (31.3%). hexadecanoic acid (14.2%), octadecanoic acid (13.0%), 4-octylphenol (9.7%), and O-methyloximedecanal (6.8%) as the main constituents. The essential oils from A. indica. A. siamensis. and A. excelsa were found to contain fatty acids (52.6%-72.3%) as major components. The minor components of the oils were n-alkanes. aromatics. esters. Sulfur and nitrogen compounds, and terpenoids. Differences in oil composition were observed between the three species. 
Azadirachta indica; Azadirachta excelsa; Azadirachta siamensis; neem; essential oil