数字农科院2.0

Metabolomic Profile and Antibacterial Bioactivity of Akebia trifoliata (Thunb.) Koidz Pericarp Extract

文献类型： 外文期刊

作者： Chen, Jing;Sun, Zhimin;Chen, Jianhua;Luan, Mingbao

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关键词： Akebia trifoliata;antimicrobial activity;bactericidal mechanism;metabolomic analysis;natural antibacterial

期刊名称： PROCESSES

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年卷期： 2022 年 10 卷 7 期

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摘要： Akebia trifoliata (A. trifoliata) is a significant medicinal and edible fruit crop and has some important bioactivities. However, there are few studies on the bacteriostatic activity of A. trifoliata, and the underlying mechanism of A. trifoliata for antibacterial activity is still unknown. Therefore, the bacteriostatic activity and antibacterial mechanism of A. trifoliata were investigated by a combination of chemical assays, using the UHPLC-TOF-MS/MS technique. The results indicated that alkaloids, triterpenoids, and flavonoids are the major secondary bioactive compounds in A. trifoliata that play a crucial role in antibacterial activity. We found that EEPA exhibited both bacteriostatic and bactericidal effects against all Gram-positive and Gram-negative bacteria tested, with IZDs ranging from 13.80 +/- 0.79 to 17.00 +/- 0.58 mm. Significant differences in terms of sensitivity between Gram-positive and Gram-negative bacteria were not observed. In contrast, both antibiotics (kanamycin sulfate and ampicillin sodium salt) exhibited much better antimicrobial activity against Gram-positive bacteria than Gram-negative bacteria. In addition, the primary antimicrobial mechanism was that EEPA increased cellular content leakage, altered the cell morphology, and destroyed the internal cell structure. Meanwhile, MA, UA, and OA, as the common triterpenoid components existing in plants, were used to analyze the relationships between the structures and the antimicrobial activities among homologous compounds, to determine the key functional group that plays an antibacterial role in MA, UA, and OA. As result, it was found that both the hydroxide and methyl groups present are important for their antibacterial activity. These findings suggested that EEPA exerted significant antimicrobial activity against S. aureus, E. coli, B. subtilis, and P. aeruginosa and might be a potential natural antibacterial.

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