不同采样液对噬菌体活性的影响研究

Effect of different sampling solutions on viability of bacteriophages

目的了解噬菌体在不同采样液中耐冲击能力的强弱,筛选用于液体冲击式采样器采集噬菌体气溶胶的最佳采样液和耐冲击性强的噬菌体。方法使用全玻璃液体冲击采样器(AGI-10)对噬菌体进行耐冲击实验,采样液选用蒸馏水(DW)、磷酸盐缓冲液(PBS)和SM液,每种采样液又分为加橄榄油组(50μl)和不加橄榄油组(0μl),在以7L/min的气流冲击30min后测定采样液中噬菌体滴度和终末采样液体积,采用校正存活率评价噬菌体耐冲击性。结果同一种噬菌体在不同采样液中的耐冲击性不同,以SM液作为采样液时,噬菌体存活率较高,SM液中是否加入橄榄油对噬菌体的耐冲击性没有影响。噬菌体SM701、SM702、PhiX174、EcP1和F2在SM液中经7L/min的气流冲击60min后,校正存活率分别约为79%、77%、86%、50%和71%。结论噬菌体在不同采样介质中的耐冲击性不同,其中以SM液保护效果最佳,噬菌体SM701、SM702和PhiX174的耐冲击性较强。

Objective To investigate the endurance or resistance of different bacteriophages to bubbling stress in different sampling solutions,to select the optimum sampling solution from three different ones and to select relatively stress-resistant bacteriophages from five different ones.Methods AGI-10（all glass impinger）was used as the representative for all the impingers that would bubble during operation to fulfill the bubbling experiment.Three different sampling solutions used,such as distilled water（DW）,phosphatic buffer solution（PBS）,and suspension medium（SM）,were divided into two groups by adding olive oil（50 μl） or otherwise（0 μl）.The impingers were operated 30 min at a flow rate of 7.0 L/min.The titers of bacteriophages and the volume of final sampling solutions were determined before the corrected survival probability was used to evaluate the stress resistance of several different bacteriophages.Results It was found that the survival probability of the same bacteriophage bubbling with different sampling solutions was different except for bacteriophage F2.The use of SM as the collection fluid was related to a high survival probability which remained unchanged between 50 μl and 0 μl olive oil.The corrected survival probability was 79%,77%,86%,50% and 71% for phage SM701,SM702,PhiX174,EcP1 and F2 respectively after 60 minutes of impingement at a flow rate of 7.0 L/min.Conclusion The endurance or resistance of different kinds of bacteriophages in the same sampling solution is different.SM might be an optimum sampling solution for phages.Bacteriophage SM701,SM702 and PhiX174 are more resistant to bubbling stress than EcP1 and F2.