China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (6): 2406-2413.doi: 10.16431/j.cnki.1671-7236.2022.06.040

• Basic Veterinary Medicine • Previous Articles     Next Articles

Study on Optimization of Extraction Process and Antibacterial Activity to Clostridium Perfringens of Total Flavonoids from Vitex negundo L.var. cannabifolia (Sieb.et Zucc.) Hand.-Mazz.

LI Yahui1,2, LUO Shengjun2, TANG Xinggang2, YUAN Minggui2, WEI Qilin2, LOU Hua1, XIANG Rong2,3   

  1. 1. School of Life Science and Engineering, Foshan University, Foshan 528225, China;
    2. Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Chinese Traditional Medicine Engineering Technology Research Center of Guangdong Province, Guangzhou 510640, China;
    3. Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Maoming 525000, China
  • Received:2021-12-06 Online:2022-06-05 Published:2022-05-27

Abstract: 【Objective】 This study was aimed to explore the extraction technology of total flavonoids from Vitex negundo L. var. cannabifolia (Sieb. et Zucc.) Hand.-Mazz. (V. negundo) and its antibacterial activity against Clostridium perfringens.【Method】 Rutin was used as reference substance and the content of total flavonoids in V. negundo was determined by spectrophotometry.Taking the content of total flavonoids as the investigation index, the effects of ethanol concentration, extraction time, extraction temperature and solid-liquid ratio on the extraction amount of total flavonoids from V. negundo were studied through single factor test, and the level range of the best process under the condition of single factor was determined.On the basis of single factor test, through the design of L9 (34) orthogonal test, the content of total flavonoids in V. negundo was determined by NaNO2-AL(NO3)3-NaOH color development method, the standard curve was drawn, the regression equation was calculated, and the standard curve was verified through the methodological investigation of precision, stability, repeatability and sample recovery.By substituting the data obtained by the experiment into the standard curve, the best preparation process of total flavonoids of V. negundo was obtained, and on this basis, the antibacterial activity of its extract against Clostridium perfringens was investigated by micro double dilution method.【Result】 The optimum extraction conditions of total flavonoids from V. negundo were ethanol concentration of 60%, extraction temperature of 50 ℃, extraction time of 2.5 h and solid-liquid ratio of 1:35.Under the optimum extraction conditions, the content of total flavonoids in V. negundo was the highest (43.17 mg/g).The order of influencing factors was solid-liquid ratio > extraction time > ethanol concentration > extraction temperature.The solid-liquid ratio had the greatest influence on the content of total flavonoids in V. negundo.The minimum inhibitory concentration (MIC) of V. negundo extract against Clostridium perfringens was 7.81 μg/mL.【Conclusion】 Under the conditions of ethanol concentration of 60%, extraction temperature of 50 ℃, extraction time of 2.5 h and solid-liquid ratio of 1:35, the content of total flavonoids extracted from V. negundo was the highest.The prepared extract had strong antibacterial effect on Clostridium perfringens, which provided a theoretical basis for the production of high-quality V. negundo extract.

Key words: Vitex negundo L. var. cannabifolia (Sieb. et Zucc.) Hand.-Mazz. (V. negundo); total flavonoids; extraction process; MIC

CLC Number: