Three samples of cultivated oregano, belonging to the most typical Sicilian species Origanum vulgare ssp.hirtum (Link) Beguinot (syn. Origanum heracleoticum L.), have been processed by g-irradiation using twodose levels: 5 and 10 kGy. The irradiated and not-irradiated samples have been analyzed to quantify theessential oil content, microbial load, as well as for sensory properties. Fifty-three compounds, representingmore than 98% of the total oil content have been fully characterized. All the cultivated samplesshowed a similar chemical profile composed of thymol and g-terpinene as main compounds followed byp-cymene, a-terpinene, carvacrol and thymol methyl ethers, myrcene and carvacrol. The correspondingirradiated samples had different essential oil profiles with a reduction in monoterpene hydrocarbons andan increase of oxygenated monoterpenes. The microbiological results showed that the total bacterial andfungal counts decrease to less than 10 cfu/g when samples were exposed to the lowest irradiation dose.Among the irradiated and not-irradiated oregano samples, there were significant differences for all the descriptors except for bitter, pungent, astringent and hay flavour.
The effect of γ-irradiation on chemical composition, microbial load and sensory properties of Sicilian oregano
RESTUCCIA, Cristina
;
2016-01-01
Abstract
Three samples of cultivated oregano, belonging to the most typical Sicilian species Origanum vulgare ssp.hirtum (Link) Beguinot (syn. Origanum heracleoticum L.), have been processed by g-irradiation using twodose levels: 5 and 10 kGy. The irradiated and not-irradiated samples have been analyzed to quantify theessential oil content, microbial load, as well as for sensory properties. Fifty-three compounds, representingmore than 98% of the total oil content have been fully characterized. All the cultivated samplesshowed a similar chemical profile composed of thymol and g-terpinene as main compounds followed byp-cymene, a-terpinene, carvacrol and thymol methyl ethers, myrcene and carvacrol. The correspondingirradiated samples had different essential oil profiles with a reduction in monoterpene hydrocarbons andan increase of oxygenated monoterpenes. The microbiological results showed that the total bacterial andfungal counts decrease to less than 10 cfu/g when samples were exposed to the lowest irradiation dose.Among the irradiated and not-irradiated oregano samples, there were significant differences for all the descriptors except for bitter, pungent, astringent and hay flavour.File | Dimensione | Formato | |
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