สำนักราชบัณฑิตยสภา

«“√ “√ √“™∫— ≥±‘ µ¬ ∂“π ªï ∑’Ë Û ©∫— ∫∑’Ë Ú ‡¡.¬.-¡‘ .¬. ÚıÙ¯ 405 W. Wongkaew, K. Chiangthong It is suggested here that Kra- dang-nga Songkhla yields essential oil in flower since the green stage and gradually emits the volatile oils towards the mature stage because of more accumulation of noticeable component. However, from the human perception the odour become more floral as the flowers mature. Further study is needed to rectify this difference. Reference Ding, J., Y. Yi, Y. Wu, Z. Lin and S. Dao. 1988. Studies on the constituents of the essential oils from Cananga odorata in the different varieties and the flowered periods. Acta Botanica Yunnanica. 10 : 331-334. Hudaib, M., Speroni, A.M.D. Pietra and V. Cavrini. 2002. GC/MS evaluation of thyme (Thymus vulgaris L. ) oil com- position and variations during the veg- etative cycle. J. Pharm. Biomed. Anal. 29 : 691-700. Overton, S.V. and J.J. Manura. 2003. Sea- sonal variation in flower volatiles. Available Source : http : //www. Sisweb.com/reference/applnote/ app-5.5htm, April 3, 2003. Weiss, E.A. 1997. Essential Oil Crops. Cab international, New York. Figure 1 GC Chromatogram of 26 components in essential oils from flowers of C. odorata var. fruticosa collected in summer at green stage.