Volatile compounds from sour guava (Psidium guineense Swartz) fruit were isolated by headspace solid-phase microextraction (HS-SPME) and simultaneous distillation-solvent extraction (SDE), and identified by GC-FID and GC/MS. A total of 181 compounds were reported for the first time in this fruit, 119 and 163 compounds were identified as headspace volatiles and fruit volatiles, respectively. Ethyl butyrate, ethyl hexanoate, b-caryophyllene and selin-11 -en-4a-ol were the major compounds. Esters (69.5%) and terpenes (60.8%) were the major classes of compounds found in the headspace volatiles and fruit volatiles.
Key Word IndexPsidium guineense, Myrtaceae, headspace volatiles, fruit volatiles, ethyl butyrate, ethyl hexanoate, b-caryophyllene, selin-11-en-4a-ol.
The headspace volatile compounds of the flowers of Lantana canescens were analysed by solid-phase microextraction coupled with GC-MS. A total of 96 volatile constituents were confirmed in the headspace accounted for about 97 % of the total composition. The headspace composition was characterized by a high number of monoterpenes and sesquiterpenes. The characteristic odour of the flowers can be attributed to the major components β-caryophyllene (16.3 %) and 1-octen-3-ol (9.6 %).
The chemical composition of the volatile compounds from the leaves of Lantana canescens Kunth (Verbenaceae) and L. lopez-palacii Moldenke grown in Colombia were analyzed by GC and GC/MS. One hundred and thirty-nine volatile compounds were identified in L. canescens, of which the major ones were β-caryophyllene (13.5%), germacrene D (10.3%) and 1-octen-3-ol (8.4%). In the oil obtained from L. lopez-palacii, eighty-three compounds were identified, of which the most prominent were 1-octen-3-ol (24.4%) and β-caryophyllene (15.2%). The in vitro antibacterial activity of the L. lopez-palacii essential oil was studied against three bacterial strains using the disc diffusion method. No antimicrobial activity was found against Escherichia coli, Enterobacter sakazakii and Listeria monocytogenes.
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