期刊
BIORESOURCES
卷 17, 期 4, 页码 6578-6587出版社
NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI
DOI: 10.15376/biores.17.4.6578-6587
关键词
Pathogenic microorganisms; Natural products; Condensed tannins; Lignocellulosic material
资金
- Minas Gerais Research Foundation (FAPEMIG)
- National Council for Scientific and Technological Development (CNPq)
- Coordination for the Improvement of Higher Education Personnel (CAPES) [001]
- Foundation for Support to Research and Innovation of Espirito Santo (FAPES)
This study quantified condensed tannins in the barks of different tree species and evaluated their antibacterial activity against mastitis pathogens. The results showed that Mimosa tenuiflora and Anacardium occidentale had the highest condensed tannin content, and all tree species exhibited good antimicrobial effect, indicating their potential application in the development of natural medicines for treating mastitis.
Condensed tannins were quantified in the barks of selected tree species, and the antibacterial activity of these substances against clinical and subclinical isolates of bovine mastitis were evaluated. Tree barks from Mimosa tenuiflora, Mimosa caesalpiniifolia, Anacardium occidentale, and Stryphnodendron adstringens were used, as well as commercial tannin from Acacia mearnsii. The tannins were extracted using a mixture of ethyl alcohol and acetone. The moisture content (MC), Stiasny index (SI), total solids content (TSC), and condensed tannins (CT) were measured. The evaluation of antimicrobial activity was determined by applying the disk diffusion test. The species that showed the highest CT were M. tenuiflora and A. occidentale, with 37.3% and 37.3%, respectively. The highest SI were obtained by the species A. occidentale and M. caesalpiniifolia, with values above 90%. The bacterium with the lowest resistance to the use of tannins was Streptococcus uberis. A. mearnsii was the only one capable of inhibiting the growth of Escherichia coli, with a mean inhibition halo of 9 mm. All species under study showed high values of condensed tannins in their barks. In addition to showing good performance as antimicrobial agents, these tannins indicated potential applications in the development of natural medicines for the treatment of bovine mastitis.
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