畜牧兽医学报 ›› 2023, Vol. 54 ›› Issue (3): 1281-1299.doi: 10.11843/j.issn.0366-6964.2023.03.039

• 临床兽医 • 上一篇    下一篇

连花清瘟药渣及发酵产物的生物活性研究

刘广1,2, 龚成燕1, 牛凯敏1, 张硕3, 陶灯3, 马军4, 吴信1, 印遇龙1, 唐宇龙1*   

  1. 1. 中国科学院亚热带农业生态研究所 中国科学院亚热带农业生态过程重点实验室 湖南省畜禽健康养殖工程技术中心 农业部中南动物营养与饲料科学观测实验站, 长沙 410125;
    2. 湖南农业大学动物科学与技术学院, 长沙 410125;
    3. 云南西南农牧集团股份有限公司, 昆明 650217;
    4. 石家庄以岭药业股份有限公司, 石家庄 050035
  • 收稿日期:2022-03-02 出版日期:2023-03-23 发布日期:2023-03-21
  • 通讯作者: 唐宇龙,主要从事生猪健康养殖研究,E-mail:tangyulong@isa.ac.cn
  • 作者简介:刘广(1998-),男,湖南益阳人,硕士生,主要从事动物营养与饲料科学研究,E-mail:lg19980905@163.com
  • 基金资助:
    湖南省重点研发项目(2022NK2054);云南省重大科技专项(202102AE090046);湖南省科技领军人才专项(2019RS3021;2019RS3020)

Study on Biological Activity of the Residue and Fermentation Products of Lianhua Qingwen

LIU Guang1,2, GONG Chengyan1, NIU Kaimin1, ZHANG Shuo3, TAO Deng3, MA Jun4, WU Xin1, YIN Yulong1, TANG Yulong1*   

  1. 1. Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central of Ministry of Agriculture, Hunan Provincial Engineering and Technology Center for Healthy Livestock and Poultry Production, Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;
    2. College of Animal Science and Technology, Hunan Agricultural University, Changsha 410125, China;
    3. Yunnan Southwest Agriculture and Animal Husbandry Group Co. LTD., Kunming 650217, China;
    4. Shijiazhuang Yiling Pharmaceutical Co. Ltd., Shijiazhuang 050035, China
  • Received:2022-03-02 Online:2023-03-23 Published:2023-03-21

摘要: 旨在研究连花清瘟药渣和发酵产物的生物学活性,探明自然发酵、优化发酵1(4MYL)和优化发酵2(Y4ML)三种发酵方式对药渣中营养成分的改变以及乙醇提取物和水提取物抑菌效果及抗病毒效果的差异。采用肉汤稀释法测定药渣发酵前后不同提取物对猪副嗜血杆菌(Haemophilus parasuis,HPS)、猪链球菌二型(Streptococcus suis type 2,SS2)、肠毒性大肠杆菌(Enterotoxigenic Escherichia coli,ETEC)3种致病菌菌株的最小抑菌浓度(MIC);以伪狂犬病病毒(Pseudorabies virus,PRV)、猪圆环病毒2型(porcine circovirus type 2,PCV2)、猪繁殖与呼吸综合征病毒(porcine reproductive and respiratory syndrome virus, PRRSV)分别感染非洲绿猴肾细胞(Vero)、非洲绿猴胚胎肾细胞(MARC-145)、猪肾细胞(PK-15),通过荧光显微镜观察细胞形态病变,同时结合实时荧光定量PCR技术进行病毒核酸检测和定量作为药物体外抗病毒效果的评价指标。结果表明,连花清瘟原药渣的乙醇和水提取物对HPS和SS2均表现出抑制作用,但对ETEC无抑制作用;对3种试验病毒均表现出抗病毒活性,但抗病毒活性存在一定区别。发酵后乙醇和水提取物增强了抗菌抗病毒活性,同时对ETEC表现出抑制作用。综上表明,连花清瘟药渣提取物具有不同程度的抗菌、抗病毒作用,能有效抑制猪养殖过程中HPS、SS2等常见的致病菌和病毒,发酵后能增强抗菌和抗病毒效果,具有开发成动物饲料或饲料添加剂的潜力。

关键词: 连花清瘟药渣, 发酵, 抗菌, 抗病毒

Abstract: The purpose of this experiment was to study the biological activities of Lianhua Qingwen residue and its fermentation products, and to investigate the differences among the methods of fermentation including natural, optimised fermentation 1 (4MYL) and optimised fermentation 2 (Y4ML) in terms of the alteration of the nutrient content of the residue and the antibacterial and antiviral effects of the ethanolic and aqueous extracts. Broth dilution method was used to determine the minimum inhibitory concentration (MIC) of different extracts of drug residue before and after fermentation against three pathogenic strains of Haemophilus parasuis (HPS), Streptococcus suis type 2 (SS2) and Enterotoxic Escherichia coli (ETEC); African green monkey kidney cells (Vero), African green monkey embryonic kidney cells (MARC-145) and porcine kidney cells (PK-15) were infected with pseudorabies virus (PRV), porcine circovirus type 2 infection (PCV2) and porcine reproductive and respiratory syndrome virus (PRRSV), respectively. The morphological changes of cells were observed by fluorescence microscope, and the virus nucleic acid was detected and quantified by real-time fluorescence quantitative PCR as an evaluation index of the antiviral effect of drugs in vitro. The results showed that the ethanolic and aqueous extracts of Lianhua Qingwen medicinal dregs showed inhibitory effects on HPS and SS2 strains, but had no inhibitory effect on ETEC; They all showed antiviral activity against the three test viruses, but there existed certain differences in antiviral activity. After fermentation, the ethanolic and aqueous extracts enhanced their antibacterial and antiviral activities and inhibited ETEC. It can be concluded that the extract of Lianhua Qingwen residue has different degrees of antibacterial and antiviral effects, can effectively inhibit HPS, SS2 and other common pathogenic bacteria and viruses in the process of pig breeding, and antibacterial and antiviral effect are enhanced after fermentation. The above results supported that Lianhua Qingwen residue extract has the potential to be developed into animal feed or feed additive.

Key words: Lianhua Qingwen residue, fermentation, antibacterial, antiviral

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