{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T03:42:45Z","timestamp":1791171765357,"version":"4.1.0"},"reference-count":73,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2015,5,18]],"date-time":"2015-05-18T00:00:00Z","timestamp":1431907200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>The application of fluorescent II-VI semiconductor quantum dots (QDs) as active photosensitizers in photodymanic inactivation (PDI) is still being evaluated. In the present study, we prepared 3 nm size CdTe QDs coated with mercaptosuccinic acid and conjugated them electrostatically with Zn(II) meso-tetrakis (N-ethyl-2-pyridinium-2-yl) porphyrin (ZnTE-2-PyP or ZnP), thus producing QDs-ZnP conjugates. We evaluated the capability of the systems, bare QDs and conjugates, to produce reactive oxygen species (ROS) and applied them in photodynamic inactivation in cultures of Candida albicans by irradiating the QDs and testing the hypothesis of a possible combined contribution of the PDI action. Tests of in vitro cytotoxicity and phototoxicity in fibroblasts were also performed in the presence and absence of light irradiation. The overall results showed an efficient ROS production for all tested systems and a low cytotoxicity (cell viability &gt;90%) in the absence of radiation. Fibroblasts incubated with the QDs-ZnP and subjected to irradiation showed a higher cytotoxicity (cell viability &lt;90%) depending on QD concentration compared to the bare groups. The PDI effects of bare CdTe QD on Candida albicans demonstrated a lower reduction of the cell viability (~1 log10) compared to bare ZnP which showed a high microbicidal activity (~3 log10) when photoactivated. The QD-ZnP conjugates also showed reduced photodynamic activity against C. albicans compared to bare ZnP and we suggest that the conjugation with QDs prevents the transmembrane cellular uptake of the ZnP molecules, reducing their photoactivity.<\/jats:p>","DOI":"10.3390\/molecules20058893","type":"journal-article","created":{"date-parts":[[2015,5,18]],"date-time":"2015-05-18T10:56:37Z","timestamp":1431946597000},"page":"8893-8912","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":40,"title":["Comparative Study on the Efficiency of the Photodynamic Inactivation of Candida albicans Using CdTe Quantum Dots, Zn(II) Porphyrin and Their Conjugates as Photosensitizers"],"prefix":"10.3390","volume":"20","author":[{"given":"Osnir","family":"Viana","sequence":"first","affiliation":[{"name":"Pharmaceutical Sciences Department, Pernambuco Federal University, Recife 50670-901, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4203-1134","authenticated-orcid":false,"given":"Martha","family":"Ribeiro","sequence":"additional","affiliation":[{"name":"Center for Lasers and Applications, IPEN-CNEN-SP, S\u00e3o Paulo 05508-000, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andr\u00e9a","family":"Rodas","sequence":"additional","affiliation":[{"name":"Center for Lasers and Applications, IPEN-CNEN-SP, S\u00e3o Paulo 05508-000, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u00falio","family":"Rebou\u00e7as","sequence":"additional","affiliation":[{"name":"Chemistry Department, CCEN Universidade Federal da Paraiba, Jo\u00e3o Pessoa 58051-900, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adriana","family":"Fontes","sequence":"additional","affiliation":[{"name":"Biophysics and Radiobiology Department, Pernambuco Federal University, Recife 50670-901, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beate","family":"Santos","sequence":"additional","affiliation":[{"name":"Pharmaceutical Sciences Department, Pernambuco Federal University, Recife 50670-901, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2015,5,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"227","DOI":"10.1111\/j.1751-1097.2011.01005.x","article-title":"Optimal photosensitizers for photodynamic therapy of infections should kill bacteria but spare neutrophils","volume":"88","author":"Tanaka","year":"2012","journal-title":"Photochem. 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