The leaf oil of Polyalthia longifolia var. pendula Hort. collected from Nghe An province, in October 2008 was isolated by steam distillation to give oil yield of 0.1% and was analyzed by Capillary GC and GC/MS. Thirty six components have been identified accounting to more than 85.4% of the oil. The major constituents of this oil appeared to be b-cadinene (24.5%), zingiberene (19.6%), aromadendrene (19.1%). Predominant minor compounds included a-pinene (5.2%), caryophyllenole (3.3%), b-eudesmol (2.5), camphene (1.7%), caryophyllene (1.5%), phellandrene (1.4%), and b-bisabolene (1.2%).
AbstractA hexane extract of the stem bark of Polyalthia longifolia furnished nine new clerodane and ent-halimane diterpenes, i.e. 16-hydroxycleroda-4(18),13-dien-16,15-olide, 16-oxocleroda-4(18),13E-dien-15-oic acid, cleroda-4(18),-13-dien-16,15-olide, 16-hydroxy-ent-halima-5(10),13-dien-16,15-olide, 16-oxo-ent-halima-5(10),13E-dien-15-oic acid, ent-halima-1(10),13E-dien-16,15-olide, 16-oxo-ent-halima-5(10),13E-dien-15-oic acid, ent-halima-5(10),13-dien-16,15-olide and ent-halima-5(10),13E-dien-16,15-olide, along with five known clerodane diterpenes. The structures of these compounds were elucidated by spectroscopic methods. The 13E configuration of two of the new ent-halimanes and one of the known clerodanes was firmly established by NOE experiments.
Nguyen Thi Chung, Le Thi THuy, Nguyen Hoa Du, Tran Dinh Thang, Do Ngoc Dai
Vinh University
(Proceedings of 3rd National Scientific Conference on Ecology and Biological Resources, Hanoi 22th October 2009 - IEBR)
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