| Summary: | This study intended to evaluate the potential industrial applications of various <i>Acacia</i> species (<i>Acacia melanoxylon</i>, <i>Acacia longifolia</i>, <i>Acacia cyclops</i>, <i>Acacia retinodes</i>, <i>Acacia pycnantha</i>, <i>Acacia mearnsii</i>, and <i>Acacia dealbata</i>) by examining their chemical composition, antioxidant, and antimicrobial properties. Using high-resolution mass spectrometry, a comprehensive analysis successfully identified targeted compounds, including flavonoids (flavonols/flavones) and phenolic acids, such as 4-hydroxybenzoic acid, <i>p</i>-coumaric acid, and ellagic acid. Additionally, <i>p</i>-coumaric acid was specifically identified and quantified within the hydroxycinnamic aldehydes. This comprehensive characterization provides valuable insights into the chemical profiles of the studied species. Among the studied species, <i>A. pycnantha</i> exhibited a higher concentration of total phenolic compounds, including catechin, myricetin, quercetin, and coniferaldehyde. Furthermore, <i>A. pycnantha</i> displayed notable antibacterial activity against <i>K. pneumoniae</i>, <i>E. coli</i>, <i>S. Typhimurium</i>, and <i>B. cereus</i>. The identified compounds in Acacia pods and their shown antibacterial activities exhibit promising potential for future applications. Moreover, vibrational spectroscopy was a reliable method for distinguishing between species. These significant findings enhance our understanding of <i>Acacia</i> species and their potential for various industrial applications.
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