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Essential oils and volatile emission of eight South African species of Helichrysum grown in uniform environmental conditions.
- Source :
-
South African Journal of Botany . Aug2019, Vol. 124, p178-187. 10p. - Publication Year :
- 2019
-
Abstract
- This paper reported for the first time the aroma profile and essential oil composition of eight species of Helichrysum endemic in South Africa but grown in Italy (CREA-Sanremo collection). The volatiles of all the studied Helichrysum were dominated by monoterpene hydrocarbons, except for H. basalticum , where sesquiterpene hydrocarbons was the main class of compounds with β-caryophyllene (13.7%) and α-guaiene (11.9%) as major components. Despite the great diversity of compounds obtained in the volatile emission (more than 130), only four compounds were responsible for at least 34% of the identified fraction. These compounds were: sabinene (16.0%), β-caryophyllene and α-guaiene in H. basalticum ; sabinene (57.7%) in H. foetidum ; (Z)-β-ocimene (34.6%), tricyclene (16.2%) and myrcene (10.0%) in H. incanatum ; myrcene (29.3%), tricyclene (21.5%) and limonene in H. indicum ; tricyclene (32.1%) and (E)-3-hexanol acetate (20.1%) in H. montanum ; limonene (10.3%), sabinene (8.9%), 1-decene (7.6%) and 1-hexanol (7.0%) in H. mutabile ; α- and β-pinene in H. patulum (27.6% and 44.9%, respectively) and α-pinene (36.3%) and α-fanchene(15.6%) in H. setosum. The EOs composition of these species was also different from each other with sesquiterpene compounds as the prevalent class. Valerianol (16.3%, os, in H. basalticum), ledol (16.3%, os, in H. foetidum), β-caryophyllene (11.0% and 13.4%, sh, in H. indicum and H. patulum , respectively), viridiflorol (18.3%, os, in H. montanum) and valerianol (30.1%, os in H. setosum) were found to be the main constituents. It is worthy to highlighting that the H. incarnatum EO showed a similar behaviour to that of the spontaneous emission with a predominance of monoterpene hydrocarbons (60.7% in EO vs 81.4% in VOC), both represented by (Z)-β-ocimene as main constituent. • First chemotaxonomic characterisation of eight South African Helichrysum spp. • These South African were grown in the same edaphic and climatic conditions. • Monoterpene hydrocarbons dominated VOC samples except for H. basalticum. • Sesquiterpenes had the highest percentage in seven EO samples. • Helichrysum incarnatum EO was characterised by high amount of monoterpenes. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02546299
- Volume :
- 124
- Database :
- Academic Search Index
- Journal :
- South African Journal of Botany
- Publication Type :
- Academic Journal
- Accession number :
- 137872418
- Full Text :
- https://doi.org/10.1016/j.sajb.2019.05.015