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The incidence of <jats:italic>C. albicans<\/jats:italic> infections is increasing and there are a limited number of antifungal drugs used in treatment. Therefore, there is an urgent need for new and alternative antifungal drugs. Pomegranate rind extract (PRE) is known for its broad-spectrum antimicrobial activities, including against <jats:italic>C. albicans<\/jats:italic> and recently, PRE and Zn (II) have been shown to induce synergistic antimicrobial activity against various microbes. In this study, the inhibitory activities of PRE, Zn (II) and PRE in combination with Zn (II) were evaluated against <jats:italic>C. albicans.<\/jats:italic> Antifungal activities of PRE and Zn (II) were evaluated using conventional microdilution methods and the interaction between these compounds was assessed by in vitro checkerboard and time kill assays in planktonic cultures. The anti-biofilm activities of PRE, Zn (II) and PRE in combination with Zn (II) were assessed using confocal laser scanning microscopy, with quantitative analysis of biofilm biomass and mean thickness analysed using COMSTAT2 analysis. In addition, antimicrobial interactions between PRE and Zn (II) were assayed in terms reactive oxygen species (ROS) production by <jats:italic>C. albicans<\/jats:italic>. PRE and Zn (II) showed a potent antifungal activity against <jats:italic>C. albicans<\/jats:italic>, with MIC values of 4\u00a0mg\/mL and 1.8\u00a0mg\/mL, respectively. PRE and Zn (II) in combination exerted a synergistic antifungal effect, as confirmed by the checkerboard and time kill assays. PRE, Zn (II) and PRE and Zn (II) in combination gave rise to significant reductions in biofilm biomass, although only PRE caused a significant reduction in mean biofilm thickness. The PRE and Zn (II) in combination caused the highest levels of ROS production by <jats:italic>C. albicans,<\/jats:italic> in both planktonic and biofilm forms. The induction of excess ROS accumulation in <jats:italic>C. albicans<\/jats:italic> may help explain the synergistic activity of PRE and Zn (II) in combination against <jats:italic>C. albicans<\/jats:italic> in both planktonic and biofilm forms. Moreover, the data support the potential of the PRE and Zn (II) combination as a novel potential anti-<jats:italic>Candida<\/jats:italic> therapeutic system.<\/jats:p>","DOI":"10.1038\/s41598-022-21995-7","type":"journal-article","created":{"date-parts":[[2022,11,15]],"date-time":"2022-11-15T11:07:00Z","timestamp":1668510420000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Synergistic activity of pomegranate rind extract and Zn (II) against Candida albicans under planktonic and biofilm conditions, and a mechanistic insight based upon intracellular ROS induction"],"prefix":"10.1038","volume":"12","author":[{"given":"Vildan","family":"Celiksoy","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rachael L.","family":"Moses","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alastair J.","family":"Sloan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryan","family":"Moseley","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Charles M.","family":"Heard","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,11,15]]},"reference":[{"key":"21995_CR1","doi-asserted-by":"publisher","first-page":"533","DOI":"10.1016\/j.oooo.2020.08.011","volume":"130","author":"A Lombardi","year":"2020","unstructured":"Lombardi, A. & Ouanounou, A. 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