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@prefix dct: <http://purl.org/dc/terms/> .
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    dct:description """
              The photo-degradation of metal complexes of caffeic acid was compared to the photo-degradation of free caffeic acid by using UV-vis spectroscopy and HPLC-ESI-mass spectrometry. This article reports first the determination of the products that are formed from the photo-degradation of <i>trans</i>-caffeic acid in aqueous solution and the investigation of the mechanism by a kinetic approach. The good fit between the model and the experimental concentration profiles confirms the photo-isomerization route of the molecule to <i>cis</i>-caffeic acid which then undergoes a cyclization to form the esculetin photo-product. In addition, it reveals, for the first time, another route of major importance leading to the product vinylcatechol. The presence of oxygen leads to an increase of the photo-isomerization rate. Then we report that metallic cations such as Al(III), Pb(II) and Cu(II) can influence the rate and mechanism of caffeic acid photo-degradation. Al(III) ions slow down the photo-degradation whereas Pb(II) and Cu(II) ions have a promoter effect on the production of esculetin. In all cases, the photo-isomerization is reduced by the presence of metal ions and the formation of vinylcatechol does not occur.
            """ ;
    dct:identifier "hal-00835301" ;
    dct:issued "2026-05-10T16:32:49.995221"^^xsd:dateTime ;
    dct:language "en" ;
    dct:modified "2026-05-10T16:32:49.995224"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Photo-degradation of <i>trans</i>-caffeic acid in aqueous solution and influence of complexation by metal ions" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "CCSD" ] ;
    dcat:distribution <https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-hal-00835301v1/resource/93657f2a-73fc-4469-ae24-975270598450> ;
    dcat:keyword "caffeic-acid",
        "chimtheochemical-sciencestheoretical-andor-physical-chemistry",
        "humic-substances",
        "infoeu-reposemanticsarticle",
        "journal-articles",
        "kinetics",
        "mechanism",
        "metal-complex",
        "photo-degradation" ;
    dcat:landingPage <ISSN:%201010-6030> .

<ISSN:%201010-6030> a foaf:Document .

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    dct:format "HTML" ;
    dct:issued "2026-05-10T16:32:50.008709"^^xsd:dateTime ;
    dct:modified "2026-05-10T16:32:49.984231"^^xsd:dateTime ;
    dct:title "Photo-degradation of <i>trans</i>-caffeic acid in aqueous solution and influence of complexation by metal ions" ;
    dcat:accessURL <https://hal.science/hal-00835301> .

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    foaf:name "test_moissonnage_selune" .