湖北农业科学 ›› 2025, Vol. 64 ›› Issue (1): 59-64.doi: 10.14088/j.cnki.issn0439-8114.2025.01.011

• 植物保护 • 上一篇    下一篇

诺丽果内生菌的分离及其代谢物的抗氧化活性

张三燕, 陈雪茹, 金卫华   

  1. 武汉东湖学院护理与健康管理学院,武汉 430212
  • 收稿日期:2024-04-02 发布日期:2025-02-20
  • 通讯作者: 金卫华(1976-),男,湖北潜江人,讲师,硕士,主要从事微生物学研究,(电话)13971392284(电子信箱)jwh2007wdu@126.com
  • 作者简介:张三燕(1987-),女,湖北黄冈人,助理实验师,硕士,主要从事微生物学研究,(电话)13886029305;并列第一作者,陈雪茹(1999-),女,湖北荆州人,在读硕士研究生。
  • 基金资助:
    武汉东湖学院校级青年基金项目(2023dhzk013); 湖北省高校优秀中青年科技创新团队项目(T2022048)

Isolation of endophytic bacteria from Morinda citrifolia and antioxidant activity of its metabolites

ZHANG San-yan, CHEN Xue-ru, JIN Wei-hua   

  1. College of Nursing and Health Management, Wuhan Donghu University, Wuhan 430212, China
  • Received:2024-04-02 Online:2025-02-20

摘要: 从新鲜诺丽果(Morinda citrifolia)中分离出9株内生菌,分别用液体培养基培养,培养液经离心后获得的上清液为胞外代谢物,离心后的菌体经超声波破碎细胞获得胞内代谢物(内溶物),测试胞外代谢物和内溶物对DPPH自由基、羟自由基、超氧阴离子、过氧化氢的清除效果和总还原力。结果表明,9株诺丽果内生菌菌株的胞外代谢物及菌体内溶物的抗氧化活性各有差异,其中,3#内生菌胞外代谢物对DPPH自由基的清除率达95.49%,4#内生菌菌体内溶物对DPPH自由基的清除率达92.47%,均超过同等体积90 μmol/L的抗坏血酸;2#内生菌胞外代谢物对羟自由基的清除效果远超抗坏血酸,达98.13%,3#内生菌菌体内溶物对羟自由基的清除率为78.00%,是抗坏血酸的2倍;3#内生菌胞外代谢产物对超氧阴离子的清除率达100%;4#内生菌菌体内溶物的总还原力最高。

关键词: 诺丽果(Morinda citrifolia), 内生菌, 代谢物, 抗氧化活性

Abstract: Nine endophytic bacteria were isolated from fresh Morinda citrifolia, which were cultured in the liquid medium respectively. The supernatant obtained after centrifuging the culture broth was the extracellular metabolite, and the intracellular metabolite (intracellular content) was obtained by ultrasonic cell disruption of the centrifuged bacteria. The scavenging effects on DPPH free radicals, hydroxyl free radicals, superoxide anions, hydrogen peroxide and the total reducing power of the extracellular metabolites and intracellular contents were tested. The results showed that the antioxidant activities of the extracellular metabolites and intracellular contents of the nine endophytic bacteria strains from Morinda citrifolia were different. Among them, the scavenging rate of the extracellular metabolites of 3# endophyte on DPPH free radicals reached 95.49%, and that of the intracellular content of 4# endophyte on DPPH free radicals reached 92.47%, both exceeding that of 90 μmol/L ascorbic acid of the same volume. The scavenging effect of the extracellular metabolites of 2# endophyte on hydroxyl free radicals was far beyond that of ascorbic acid, reaching 98.13%. The scavenging rate of hydroxyl free radicals of the intracellular content of 3# endophyte was 78.00%, which was twice that of ascorbic acid. The scavenging rate of the extracellular metabolite of 3# endophyte on superoxide anions reached 100%. The total reducing power of the intracellular content of 4# endophyte was the highest.

Key words: Morinda citrifolia, endogenous bacteria, metabolite, antioxidant activity

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