OUTLINE

Bacteriophage and its Applications in Food

ByRasha Mohamed Mahmoud

Supervised by Prof. Dr. Zakaria Yehia Daw Dr. Mona Hussein Badawi

OUTLINESIntroduction to BacteriophageClassificationPhage Life CycleWhere we can find phages?Desirable properties of phages used as biocontrol agents in foodsBacteriophages for biocontrol of pathogens in foodSome reviews on Bacteriophage in food safetyLarge Scale Production and Purification StrategyBacteriophages in DetectionAdvantages of PhageChallenges in Bacteriophage and Measures to control

Introduction

Obligate intracellular parasites that multiply inside bacteria by making use of some or all of the host biosynthetic machinery

Felix d'HerelleIndependently discovered again 1917Frederick TwortIn 1915 Discovered Bacteriophage

ClassificationTaxonomy by, International Committee on Taxonomy of Viruses (ICTV)3 orders, 73 families, 9 sub -families, 287 genera and 1938 virus species

Classification Examples MyoviridaeT-even, P1, P2, GSiphoviridae, T1, T5, MM1, A2PodoviridaeP22, N4, T3, T7, C1InoviridaeM13, fdMicroviridaeX174TectiviridaeNS11, PRD1CorticoviridaePM2LeviviridaeMS2, R17, f2, QCystoviridae6

Phage Fates

Phage Attack

Where we can find phages?In humans and animal intestines In running water In the soil Effluent outlets Sewage from corpsesDr. "Grammy bar" from the University of San Diego, California, says that Bacteriophag viruses live in the human intestine does not harm him (Research 2013). On the contrary, is stick to the mucous layer of the intestines and are covered, if approached her cell bacteria hung out and penetrate the cell wall and enter them and multiply. Then explodes bacteria cell and out of a large number of viruses Bacteriophage . Thus, service to the people of this virus leads, at the same time provide them with the appropriate center for human living

Desirable properties of phages used as biocontrol agents in foodsPhage should be strictly lyticPhage should have a broad host rangeDetermine the complete genome sequence of phagesLack of transduction of bacterial DNAOral feeding studies of phages should show no adverse effectsPhage preparation should be stable over storage and applicationPhage should be amenable to scale up for commercial production

Bacteriophages for biocontrol of pathogens in food

From

Farm

To

Fork

Some reviews on Bacteriophage in food safety

PathogenDescriptionReferencesListeria monocytogenes8 log reduction in Melon juice, 2.10 log reduction in Pear juice by ListexTM p100Oliveira et al., 2014E coli O157:H7Fresh cut leafy greens: EcoshieldTM reduction upto 3.24 log unit compared with MAP results 4.24 Log reduction Boyacioglu et al., 2013SalmonellaReduction of 6 log units of S. typhimurium by bacteriophage st1 in ChickenWong et al., 2014 Vibrio parahemolyticus2.76 log reduction in oysters by phage VPp1Rong Rong, 2014CampylobacterTesting by applying in the drinking water of chicken and tested for the Campylobacter in feces and also slaughtered and checked, in feces 7.5 PFU and reduction of 3.5 log unitKittler et al., 2013

Large Scale Production and Purification Strategy

Bacteriophages in DetectionBacteriophage will help to attach bacteria specifically, which will be detected by a sensor or by any means

Advantages of PhageUbiquitous in natureHighly active and specificGenetically amenableVersatile use along the food chainTools for detecting pathogensSource of potent antimicrobial agents

Challenges in Bacteriophage and Measures to controlBacterial resistance to bacteriophagesA mixture or cocktail of different phages (Abuladze et al ., 2008)Broad specificity to account for differences in bacterial strainsHigh multiplicities of infection (MOI) 103106 (Yoichi et al. (2004))Large-scale safer production systemsUse of non virulent bacteria in productionEnhance activity in food systemsModelling phage behaviour

Some products and companies involved in the phage business

Any Questions?

References

http://www.biocontrol-ltd.com/ with thanks to Dr. David R. Harper http://www.phagetherapycenter.com/ http://en.wikipedia.org/wiki/Phage_therapy http://recursive-nature.com/bacteriaphoge/ Haq I U et al (2012) Bacteriophages and their Implications on Future Biotechnology: A Review J Virol 9:Wang Y, Ye Z, Ying Y. New trends in impedimetric biosensors for the detection of foodborne pathogenic bacteria. Sensors (Basel) 2012; 12:3449-71;PMID:22737018; http://dx.doi.org/10.3390/ s120303449Stewart GS, Jassim SA, Denyer SP, Newby P, Linley K, Dhir VK. The specific and sensitive detection of bacterial pathogens within 4 h using bacteriophage amplification. J Appl Microbiol 1998; 84:777-83; PMID:9674131; http://dx.doi.org/10.1046/j.1365-2672.1998.00408.xPower point presentation (2015) www.slideshare.net/

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