Abstract

URZUA, ALEJANDRO. MONOTERPENES AND SESQUITERPENES IN THE HEADSPACE VOLATILES FROM INTACT PLANTS OF PSEUDOGNAPHALIUM VIRA VIRA, P. HETEROTRICHIUM, P. CHEIRANTHIFOLIUM AND P. ROBUSTUM: THEIR INSECT REPELLENT FUNCTION. Bol. Soc. Chil. Quím. [online]. 2002, vol.47, n.2, pp.99-104. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442002000200005.

Thirty-seven monoterpenes and sesquiterpenes have been identified in the headspace of four Pseudognaphalium spp. The major compound identified was a-(z)-ocimene [1]: 87.0% in P. vira vira, 45.0% in P. heterotrichium, 41.0% in P. cheiranthifolium and 76.0% in P. robustum. Other major components were germacrene D [2] (6.4%) in P. vira vira, b-phellandrene [3] (45.4% and 27.4%) in P. heterotrichium and P. cheiranthifolium, germacrene B [4](17.9%) in P. cheiranthifolium and (E)-3,7,11-trimethyl-1,6,10-dodecatriene-3-ol [5] (9.5%) in P. robustum. The insect repellent function of the mixture of volatile compounds is discussed

Keywords : Pseudognaphalium spp.; Asteraceae; Headspace; Monoterpenes; Sesquiterpenes; Insect repellents.