A headspace (HS)/solid phase microextraction (SPME)/gas chromatography-mass spectrometry (GC-MS) method was developed to determine the profiles of volatile compounds from three Cuban unifloral honeys: Turbina corymbosa (L.) Raf., Ipomoea triloba L. and Gouania polygama (Jacq.) Urb. The optimization of the extraction conditions was carried out by response surface methodology. The analytical conditions of the optimized HS-SPME method were: 65 mm PDMS/DVB fiber, 6 g honey, 3 mL water and 20% w/w sodium chloride, 20 min for pre-extraction, 30 min for extraction at 60C and 4 min for GC desorption. The GC-MS analysis allowed the identification of 181 volatile compounds in these honeys. Possible markers for the floral classification of honeys were for the T. corymbosa type: 4-methyl methoxysalicylate, trans-pinocarveol, chavicol, methyl anisate, trans-abergamotene and a-bisabolol. In I. triloba honey, 2,5,5-trimethyl-3-tetrahydrofuranone and 1,2-diphenylethanol were found, while 5 Corresponding

The chemical composition of the volatile compounds from the leaves of Galinsoga parviflora Cav. (Asteraceae) from Colombia was studied by GC and GC/MS. Eighty-eight volatile compounds were identified, of which the major ones were (Z)-3-hexen-1-ol (21.7%), β-caryophyllene (12.4%), and 6-demethoxy-ageratochrome (14%). The leaf oil presented antimicrobial activities against the Gram-positive bacteria Staphylococcus aureus and Bacillus cereus.

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The chemical composition of the volatile compounds from the leaves of Lippia dulcis Trev. (Verbenaceae) from Colombia was studied by GC and GC/MS. Forty volatile compounds were identified, of which the major ones were α-copaene (18.0%), β-caryophyllene (17.8%), and δ-cadinene (14.7%). The sweet bisabolane sesquiterpenoid, hernandulcin, formed only 1.1% of the leaf oil.

The chemical composition of cold-pressed mandarin peel oil from Cuba was studied by GC and GC/MS. Eigthy-five compounds of the oil were identified of which limonene (78.3 %) and γ-terpinene (7.2 %) were the major constituents. The composition of the peel oil is characterized by higher percentages of monoterpene and sesquiterpene hydrocarbons and the presence of many aliphatic saturated and unsaturated aldehydes at lower concentrations.