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The goals of this study were to characterize the phytochemical composition and investigate the antioxidant activity, the antibiotic effect, and the mode of action against<jats:italic>Salmonella<\/jats:italic>of the hydroethanolic extracts from<jats:italic>K. brasiliensis<\/jats:italic>leaves collected in the summer and spring Brazilian seasons. These extracts had their chemical composition established by high-performance liquid chromatography with diode-array detection. Total phenolic and flavonoid contents were spectrophotometrically determined. 2,2-Diphenyl-1-picryl-hydrazyl radical scavenging, phosphomolybdenum reducing power and<jats:italic>\u03b2<\/jats:italic>-carotene bleaching assays were carried out to evaluate the antioxidant capacity. Antibiotic potential was assessed by minimal inhibitory concentration against 8 bacterial ATCC\u00ae and 5 methicillin-resistant<jats:italic>Staphylococcus aureus<\/jats:italic>and 5<jats:italic>Salmonella<\/jats:italic>clinical strains. The mode of action was investigated by time-kill, bacterial cell viability, and leakage of compounds absorbing at 280\u2009nm assays against<jats:italic>Salmonella<\/jats:italic>. Chromatographic profile and UV spectrum analyses suggested the significant presence of flavonoid type patuletin and eupafolin derivatives, and no difference between both periods of collection was noted. Significant amounts of total phenolic and flavonoid contents and a promising antioxidant capacity were observed. Hydroethanolic extracts (70%, summer and spring) were the most active against the tested Gram-positive and Gram-negative bacterial strains, showing the bacteriostatic action of 5000<jats:italic>\u03bc<\/jats:italic>g\/mL. Time-kill data demonstrated that these extracts were able to reduce the<jats:italic>Salmonella<\/jats:italic>growth rate. Cell number was reduced with release of the bacterial content. Together, these results suggest that<jats:italic>K. brasiliensis<\/jats:italic>is a natural source of antioxidant and antibacterial agents that can be applied in the research and development of new antibiotics for the treatment of<jats:italic>Salmonella<\/jats:italic>gastroenteritis because they are able to interfere in the<jats:italic>Salmonella<\/jats:italic>growth, probably due to cell membrane damage.<\/jats:p>","DOI":"10.1155\/2019\/9245951","type":"journal-article","created":{"date-parts":[[2019,11,11]],"date-time":"2019-11-11T23:34:45Z","timestamp":1573515285000},"page":"1-15","source":"Crossref","is-referenced-by-count":15,"title":["<i>Kalanchoe brasiliensis<\/i>Cambess., a Promising Natural Source of Antioxidant and Antibiotic Agents against Multidrug-Resistant Pathogens for the Treatment of<i>Salmonella<\/i>Gastroenteritis"],"prefix":"10.1155","volume":"2019","author":[{"given":"Oscar Alejandro Santos","family":"Mayorga","sequence":"first","affiliation":[{"name":"Programa de 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