Composition of the essential oils from three Laggera Spp. from Cameroon

Abstract

The essential oils from the leaves of Laggera alata var. montana C. D. Adams, and Laggera gracilis (O. Hoffm. & Muschl.) C. D. Adams, and those from leaves, roots and stems of Laggera oloptera (DC.) C. D. Adams from the western highlands of Cameroon were analysed by GC and GC-MS. The essential oils of L. alata var. montana and L. gracilis were found to be rich in dimethoxy-p-cymene (34% and 33%, respectively). The other most abundant components in these oils were 7-epi--eudesmol (21%), juniper camphor (7%) for L. alata var. montana and -eudesmol (10%),ˇ-caryophyllene (7%) for L. gracilis. The essential oils from leaves of L. oloptera were found to be poor in dimethoxy-p-cymene (0.1-0.3%) but affordedˇ-caryophyllene (15-20%), germacrene-D (10-17%) and sabinene (2-28%) while the volatile extract from roots and stems were rich in dimethoxy-p-cymene (67% and 36%, respectively) andˇ-caryophyllene (6% and 16%, respectively). The essential oil from the stems also contained a high proportion of -eudesmol (20%).

Chemical investigation of the essential oil of Laggera crispata (Vahl) Hepper & Wood from India

“…The essential oil of L. alata grown in Nigeria 12 and Cameroon; 14 L. aurita grown in India; 18 L. gracilis grown in Cameroon; 14 …”

“…5,6 Many phytochemical investigations have been performed on the non-volatile and volatile constituents of different species of Laggera from various countries. [7][8][9][10][11][12][13][14][15][16][17] In India, L. aurita has also been studied on a few occasions. [18][19][20] However, a literature survey revealed that there are no reports available on the phytochemical aspects of L. crispata from India.…”

Antidermatophytic activities of nine (9) essential oils

“…difference in activity observed between the essential oil could be due to their chemical dissimilarities both quantitatively and qualitatively. Indeed, the essential oil of L. alata var montana is mainly constituted of dimethoxy-p-cyrnene (34%) and epi-y-endesmol (2 1.4%) [7]. Those of leaves and flowers of E. floribundus are rich in limonene (9.5 % for leaves and 3.7 % for the flowers) and i n polyacetylated compounds 1 ike (E)-2-lachnophyllum ester (23.7 % for leaves and 3.4 % for the flowers) [8].…”

“…Indeed, the essential oil of L. alata var montana is mainly constituted of dimethoxy-p-cyrnene (34%) and epi-y-endesmol (2 1.4%) [7]. Those of leaves and flowers of E. floribundus are rich in limonene (9.5 % for leaves and 3.7 % for the flowers) and i n polyacetylated compounds 1 ike (E)-2-lachnophyllum ester (23.7 % for leaves and 3.4 % for the flowers) [8]. The observed activities could be attributed to these major components while recognizing that this activity is often the result of the combined action (antagonism, synergy and potentiation) of all the constituents of an essential oil talung into consideration even.…”

“…All voucher specimens have been deposited at the Laboratory of plant Biology, Faculty of Science, University of Dschang. Fresh plant material (lkg) was subjected to hydrodistillation for 8 hours. The oil was dried over anhydrous sodium sulfate and stored in refrigerator till usage.…”