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发酵罐酸洗钝化对百日咳杆菌生长和产毒的影响

International Journal of Biologicals(2020)

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Abstract
目的:探讨发酵罐酸洗钝化对百日咳杆菌生长和产毒的影响。方法:定期对百日咳发酵罐进行酸洗钝化处理,去除其表面附着的代谢螯合物。通过检测后续培养收获物菌浓度(550 nm吸光度值)、一次盐析沉淀量、发酵产物中百日咳毒素(pertussis toxin,PT)和丝状血凝素(filamentous haemagglutinin,FHA)含量,比较分析酸洗钝化对发酵培养和产毒的影响。结果:对处理前后各连续10批相关指标进行比较,处理后菌体550 nm吸光度均值由4.663提高至5.490,一次盐析沉淀量均值由4.84 g/L提高至5.90 g/L,PT平均含量达到3.3 μg/ml,FHA平均含量达到7.6 μg/ml,处理前后各连续10批菌体浓度和一次盐析沉淀量数据采用 t检验计算出 P值分别为0.03和0.05,差异均有统计学意义。 结论:定期对发酵罐进行酸洗钝化可有效改善百日咳杆菌发酵及产毒水平。
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Key words
Bordetella pertussis,Fermentation,Pickling,Passivation,Bacterial concentration,First salting-out precipitation
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