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Once extracted, they can be deteriorated losing their organoleptic and therapeutic properties due to various environmental factors, being light exposure in aerobic conditions the main cause. In this work, the oregano essential oil extraction and characterization from <jats:italic>Origanum vulgare<\/jats:italic> plants grown in the experimental field of the FTU\u2010UNSL and its photodegradation in MeOH:H<jats:sub>2<\/jats:sub>O 60:40 v\/v solvent were studied. Characterization by EIMS and NIST Mass Spectrometry indicates the main compounds of oregano essential oil, quantified in the extracted oil by GC\u2010MS, are carvacrol (7.14%) and thymol (47.37%). Degradation of essential oil and its two major components can be caused by reactive oxygen species photogenerated from endogenous sensitizers as riboflavin. Our results suggest degradation occurs involving singlet molecular oxygen. Interaction of carvacrol and thymol with singlet oxygen is mainly a physical process, while essential oil has an important reactive component, which indicates there might be other constituents which could contribute to reactive photoprotection. The effect of simultaneous presence of oregano essential oil and tryptophan amino acid\u2014used as a photooxidizable model under riboflavin\u2010photosensitizing conditions\u2014was studied in order to evaluate the possible photoprotection exerted by the essential oil.<\/jats:p>","DOI":"10.1111\/php.13265","type":"journal-article","created":{"date-parts":[[2020,3,27]],"date-time":"2020-03-27T14:44:14Z","timestamp":1585320254000},"page":"1005-1013","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Oregano Essential Oil Interactions with Photogenerated Singlet Molecular Oxygen"],"prefix":"10.1111","volume":"96","author":[{"given":"Frida C. D.","family":"Dimarco Palencia","sequence":"first","affiliation":[{"name":"Facultad de Qu\u00edmica, Bioqu\u00edmica y Farmacia \u00c1rea de Qu\u00edmica F\u00edsica Instituto de Qu\u00edmica de San Luis INQUISAL (CONICET\u2010UNSL) Universidad Nacional de San Luis San Luis Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vanesa A.","family":"Mu\u00f1oz","sequence":"additional","affiliation":[{"name":"Facultad de Qu\u00edmica, Bioqu\u00edmica y Farmacia \u00c1rea de Qu\u00edmica F\u00edsica Instituto de Qu\u00edmica de San Luis INQUISAL (CONICET\u2010UNSL) Universidad Nacional de San Luis San Luis Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ariana C.","family":"Posadaz","sequence":"additional","affiliation":[{"name":"FTU\u2010UNSL \u00c1rea de Formaci\u00f3n B\u00e1sica Facultad de Turismo y Urbanismo Universidad Nacional de San Luis San Luis Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Diego A.","family":"Cifuente","sequence":"additional","affiliation":[{"name":"Facultad de Qu\u00edmica, Bioqu\u00edmica y Farmacia \u00c1rea de Qu\u00edmica Org\u00e1nica Instituto de Tecnolog\u00eda Qu\u00edmica INTEQUI (UNSL\u2010CONICET) Universidad Nacional de San Luis San Luis Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sandra","family":"Miskoski","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica Facultad de Ciencias Exactas F\u00edsico\u2010Qu\u00edmicas y Naturales Universidad Nacional de R\u00edo Cuarto R\u00edo Cuarto Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriela V.","family":"Ferrari","sequence":"additional","affiliation":[{"name":"Facultad de Qu\u00edmica, Bioqu\u00edmica y Farmacia \u00c1rea de Qu\u00edmica F\u00edsica Instituto de Qu\u00edmica de San Luis INQUISAL (CONICET\u2010UNSL) Universidad Nacional de San Luis San Luis Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Norman A.","family":"Garc\u00eda","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica Facultad de Ciencias Exactas F\u00edsico\u2010Qu\u00edmicas y Naturales Universidad Nacional de R\u00edo Cuarto R\u00edo Cuarto Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7843-9548","authenticated-orcid":false,"given":"Mar\u00eda P.","family":"Monta\u00f1a","sequence":"additional","affiliation":[{"name":"Facultad de Qu\u00edmica, Bioqu\u00edmica y Farmacia \u00c1rea de Qu\u00edmica F\u00edsica Instituto de Qu\u00edmica de San Luis INQUISAL (CONICET\u2010UNSL) Universidad Nacional de San Luis San Luis Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,5,25]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.14302\/issn.2576-6694.jbbs-18-2489"},{"key":"e_1_2_6_3_1","first-page":"225","article-title":"Chemical composition and antioxidant activity of lavender (Lavandula angustifolia Mill.) aboveground parts","volume":"15","author":"Nurzy\u0144ska\u2010Wierdak R.","year":"2016","journal-title":"Acta Sci. 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