Chemical Composition of the Essential Oil Isolated from Flower, Leaf, Stem and Root of Nepeta Sintenisii Bornm. from Iran

Abstract

The essential oils isolated from different parts (flower, leaf, stem and root) of Nepeta Sintenisii Bornm. (family: Lamiaceae) growing in Khalkhal, North-west Iran, were analyzed by GC and GC-MS. The oil yields were: flower 1.2 %, leaf 0.25 %, stem 0.06 %, and root 0.05 % (v/w). Fourteen compounds representing 98.7 % of the flower oil of Nepeta Sintenisii, were identified; among them 4aß, 7 a, 7aß-nepetalactone (60.3 %), germacrene D (12.7 %) and 1, 8-cineol (8.2 %) were the major ones. Twenty constituents (95.7 % of the leaf oil) were identified of which 4aß, 7a, 7aß-nepetalactone (34.6 %), germacrene D (14.1 %), 1, 8-cineol (7.9 %), a-cadinol (6.8 %) and ô-cadinene (5.8 %) were the main components. The stem oil of the plant was characterized by higher amount of 4aß, 7a, 7aß-nepetalactone (64.2 % ), a-cadinol (8.9%), a-pinene(6.7%), 4aa, 7áa, 7aß-nepetalactone (5.2 %) and 1,8-cineol (3.6 %), among the eight components comprising 96.3 % of the total oil detected. Twelve compounds in root of plant were characterized representing 98.6 % of the components detected with 4aß,7a,7aß-nepetalactone (61.2 %), germacrene D (12.0 %),4aa,7a,7aß-nepetalactone (8.5 %), 1,8-cineol (5.7 %) and ß-caryophyllene(4.5 %) as the main constituents. The oil of flower, stem and root consisted mainly of monoterpenes, but monoterpenes and sesquiterpenes of leaf oil was approximately equal amount in the percentage (48.2 % and 47.5 % respectively).