{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T00:22:20Z","timestamp":1792542140003,"version":"4.5.0"},"reference-count":100,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2026,5,16]],"date-time":"2026-05-16T00:00:00Z","timestamp":1778889600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001321","name":"National Research Foundation","doi-asserted-by":"publisher","award":["PMDS230502101171"],"award-info":[{"award-number":["PMDS230502101171"]}],"id":[{"id":"10.13039\/501100001321","id-type":"DOI","asserted-by":"publisher"}]},{"award":["PMDS230502101171"],"award-info":[{"award-number":["PMDS230502101171"]}],"id":[{"id":"https:\/\/ror.org\/01xpa3123","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Microorganisms"],"abstract":"<jats:p>The persistence of Mycobacterium tuberculosis within biofilm-like structures underscores the need for alternative drug discovery strategies aimed at resistance mechanisms. Medicinal plants provide a rich source of chemically diverse compounds with broad biological activities, including potential antimycobacterial properties. This study investigated acetone stem extracts from Buddleja saligna, Combretum hereroense, and Olea europaea subsp. africana for their phytochemical composition, antioxidant capacity, and antimycobacterial activity against planktonic and biofilm forms of Mycobacterium smegmatis. Phytochemical profiles were analyzed using liquid chromatography\u2013mass spectrometry and quantified through colorimetric assays. Antioxidant activity was assessed using DPPH radical scavenging and ferric reducing power assays, while antimycobacterial effects at MIC and sub-MIC levels were determined through microdilution and growth kinetic assays. Phytochemical composition and concentrations varied among extracts, with B. saligna exhibiting the highest levels of tannins (287.18 \u00b1 0.19 mgGAE\/g extract) and flavonoids (16.48 \u00b1 0.05 mgQE\/g extract) and showing the strongest antioxidant activity (17.66 \u00b1 5.396 and 399.1 \u00b1 3.717 \u00b5g\/mL). C. hereroense had a notable antimycobacterial activity with an MIC of 0.16 mg\/mL followed by B. saligna and O. europaea subsp. afriana with MIC values of 0.31 and 0.63 mg\/mL, respectively. All extracts significantly inhibited early biofilm formation by over 80% at sub-MICs. However, the mature biofilms and sliding motility were less susceptible to the extracts. Overall, the results confirm the antioxidant and antimycobacterial potential of the selected plant extracts, while highlighting challenges in targeting mycobacterial biofilms.<\/jats:p>","DOI":"10.3390\/microorganisms14051133","type":"journal-article","created":{"date-parts":[[2026,5,18]],"date-time":"2026-05-18T08:56:27Z","timestamp":1779094587000},"page":"1133","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Investigating the Antimycobacterial, Antibiofilm, and Antioxidant Activities of Plant Extracts Against Mycobacterium smegmatis"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2115-0852","authenticated-orcid":false,"given":"Ramokone","family":"Mothupi","sequence":"first","affiliation":[{"name":"Department of Biochemistry, Microbiology and Biotechnology, Faculty of Science and Agriculture, University of Limpopo, Private Bag X1106, Sovenga 0727, South Africa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mashilo","family":"Matotoka","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, Microbiology and Biotechnology, Faculty of Science and Agriculture, University of Limpopo, Private Bag X1106, Sovenga 0727, South Africa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7455-4493","authenticated-orcid":false,"given":"Gabriel","family":"Mashabela","sequence":"additional","affiliation":[{"name":"Division of Molecular Biology and Human Genetics, SAMRC Centre for Tuberculosis Research, Stellenbosch University, Tygerberg Campus, Francie Van Zijl Drive, Parow, Cape Town 7505, South Africa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8076-083X","authenticated-orcid":false,"given":"Peter","family":"Masoko","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, Microbiology and Biotechnology, Faculty of Science and Agriculture, University of Limpopo, Private Bag X1106, Sovenga 0727, South Africa"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,5,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"101574","DOI":"10.1016\/j.cimid.2020.101574","article-title":"Drug resistant Tuberculosis: A review","volume":"74","author":"Khawbung","year":"2021","journal-title":"Comp. 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