Dr. Nayra  Shaker Ibrahim Mehanna
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Dr. Nayra Shaker Ibrahim Mehanna

Research Professor
National Research Center, Egypt

Highest Degree
Ph.D. in The relationship between cheese starter and bacteriophage from Ain Shams University, Cairo, Egypt

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Area of Interest:

Food Science Technology
Food Fermentation
Dairy Science
Food Technology
Food Nutrition

Research Publications in Numbers


Selected Publications

  1. Shaaban, S.Y., Y.G. El Gendy, N.S. Mehanna, W.M. El-Senousy, H.S. El-Feki, K. Saad and O.M. El-Asheer, 2018. The role of probiotics in children with autism spectrum disorder: A prospective, open-label study. Nutr. Neurosci., 21: 676-681.
    CrossRef  |  Direct Link  |  
  2. Nasry, S., H. Elgamily, I. El-Refai and N. Mehanna, 2018. The clinical efficacy of a probiotic miswak oral spray in patients with gingivitis. J. Int. Dent. Med. Res., 11: 433-440.
    Direct Link  |  
  3. Fayed, B., A. Abood, H.S. El-Sayed, A.M. Hashem and N.S. Mehanna, 2018. A synbiotic multiparticulate microcapsule for enhancing inulin intestinal release and Bifidobacterium gastro-intestinal survivability. Carbohydr. Polym., 193: 137-143.
    CrossRef  |  Direct Link  |  
  4. Sadek, Z.I., B.M. Refaat, E.H. Abd El-Shakour, N.S. Mehanna and M.S. Hassan, 2017. Biocontrol of processed cheese by incorporation of probiotic bacteria and its metabolites. Int. J. Dairy Sci., 12: 93-104.
    CrossRef  |  Direct Link  |  
  5. Mehanna, N.S., F.A.M. Hassan, T.M. El-Messery and A.G. Mohamed, 2017. Production of functional processed cheese by using tomato juice. Int. J. Dairy Sci., 12: 155-160.
    CrossRef  |  Direct Link  |  
  6. Ibrahim, M.K., B.A.M. Effat, N.F. Tawfik, N.S. Mehanna and N.R. Soliman, 2017. Evaluation of probiotic potential of dairy propionibacteria. J. Innov. Pharm. Biol. Sci., 4: 34-42.
  7. Sallam, M., I. Wali, A.E.F. Attia, W. Lotfy, A. El Taweel and N.S. Mehanna, 2016. Relation between probiotic properties of isolates isolated from breast milk and infants’ stools. Nutr. Food Sci., 46: 294-305.
    CrossRef  |  Direct Link  |  
  8. Mohamed, A.G., H.M. Abbas, A.F. Zayan and N.S. Mehanna, 2016. Bacterial strains as vitamins supplements to prepare functional dairy beverages. Am. J. Food Technol., 11: 234-239.
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  9. Sallam, M.K., I.E. Wali, M.H. Abd El Fattah, W.M.N. Lotfy, N.S. Mehanna and A. El-Taweel, 2015. Isolation of enterococci and streptococci species from human breast milk. Egypt. J. Med. Microbiol., 24: 75-79.
    CrossRef  |  Direct Link  |  
  10. Sallam, M.K., I.E. Wali, A.E.F.M. Attia, W. Lotfy, N.S. Mehanna and A. El-Taweel, 2015. Isolation of lactobacilli and bifidobacteria species from human breast milk. Egypt. J. Med. Microbiol., 24: 69-73.
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  11. Sadek, Z.I., B.M. Refaat, E.H. Abd El-Shakour, N.S.H. Mehanna and M.S. Hassan, 2015. Potential sources of aerobic and anaerobic spore former bacteria in processed cheese. Res. J. Pharmaceut. Biol. Chem. Sci., 6: 757-769.
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  12. Hassan, Z.M.R., T.M.A.R. El-Messery, H.M.F. Din, N.S. Mehanna and A.A. Ali, 2015. Determination of interaction between some planet tannins and milk proteins by HPLC. Int. J. Food Nutr. Sci., 4: 21-27.
  13. Elgamily, H.M., S.M. Nagi, A.A. Kassem, K.A. Nour, M.H. Zaazou and N.S. Mehanna, 2015. In-vitro comparative study of antimicrobial activity of two plant extracts and probiotic strain against isolated oral cariogenic pathogen. Res. J. Pharm. Biol. Chem. Sci., 6: 1705-1709.
  14. El Din, H.M.F., T.M. El-Messery, N.S. Mehanna, A.A. Ali, Z.M.R. Hassan and R. Amarowicz, 2015. Interaction between some plants tannins and milk protein. Int. J. Food Nutr. Sci., 4: 16-20.
  15. Tawfik, N.F., B.A.M. Effat, K. El Shafei, R.K. El Dairouty and O.M. Sharaf et al., 2014. Mastitis and antibiotic residues in egyptian raw milk with lactic acid bacteria population in dairy products retailed in Cairo and Giza area. Global Veterinaria, 13: 696-703.
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  16. Mehanna, N.S., Z.M.R. Hassan, H.M.F. El-Din, A.A.E. Ali, R. Amarowicz and T.M. El-Messery, 2014. Effect of interaction phenolic compounds with milk proteins on cell line. Food Nutr. Sci., 5: 2130-2146.
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  17. El-Batawy, O.I., I.S. Ashoush and N.S. Mehanna, 2014. Impact of mango and pomegranate peels supplementation on quality characteristics of yoghurt with or without whey powder. World J. Dairy Food Sci., 9: 57-65.
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  18. Mehanna, N.S., N.F. Tawfik, M.M. Salem, B.A. Effat and D.A. Gad El-Rab, 2013. Assessment of potential probiotic bacteria isolated from breast milk. Middle-East J. Sci. Res., 14: 354-360.
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  19. Mehanna, N.S., B.A.M. Effat, N.F. Tawfik, Z.I. Sadek, N.M.A. Dabiza, K. El-Shafie and A.B. Abd-El-Khalek, 2013. Evaluation of antibacterial activity of aqueous extracts of thyme and black pepper against pathogens and probiotics. J. Applied Sci. Res., 9: 1181-1185.
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  20. Hassan, Z.M.R., H.M.F. El Din, A. Ali, N.S. Mehanna and T. El-Messery, 2013. Interaction of some low molecular weight phenolics with milk proteins. World Applied Sci. J., 23: 182-187.
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  21. Mehanna, N.S., E.A.M. Omara and I.M. Hosni, 2012. Safety assessment of probiotic bacteria in dietary of laboratory animals. Adv. Res. J., .
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  22. El-Aziz, M.A., F.M. Assem, F. Select, N.S. Mehanna and M.H. El-Salam, 2012. The use of soy protein concentrate in the manufacture of UF-buffalo soft cheese. Egypt. J. Dairy Sci., 40: 159-167.
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  23. Mehanna N.S., A.A.H. Rayes and S.M.M.J. El-Naggar, 2011. Role of Fermented milk in treating the histopathological and the histochemical changes induced by the toxic mutagen. Nutr. Food Sci., 41: 136-146.
    CrossRef  |  Direct Link  |  
  24. Halah, M.F. and N.S. Mehanna, 2011. Use of natural plant antioxidant and probiotic in the production of novel yogurt halah. J. Evol. Biol. Res., 3: 12-18.
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  25. Mehanna, N.S. and G. Reid, 2010. Effect of meswak middle eastern tree bark on oral pathogens and potential for probiotic applications. J. Med. Food, 13: 729-732.
    PubMed  |  
  26. El-Menoufy, H.S., M. Galal, A.N. El-Khouli, M. Ammar and N. Mehanna, 2010. Clinical and antimicrobial efficacy of acacia nilotica mouth rinse preparation in inhibiting the development of plaque and gingivitis (A comparative study). Egypt. Dent. J., 56: 57-71.
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  27. Mehanna, N.S.H., M.H. Zaazou, B.S. Ahmed and M.A. El-Yazeed, 2009. Effect of some probiotic strains and meswak plant on certain oral pathogenic strains. Int. J. Academic Res., 1: 128-132.
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  28. El-Arab, A.E., S. Zeinab and N. Mehanna, 2009. Effect of honey on the growth of pathogenic bacteria. Egypt. J. Nutr., 24: 315-330.
  29. El-Arab, A.E. and N. Mehanna, 2009. Effect of feeding honey on weight gain, lipid profiles and caecum probiotic bacteria of healthy and hypercholesterolemic rats. Egypt. J. Nutr., 24: 185-211.
  30. Rayes, A.A.H., El-Naggar S.M.M. and N.S. Mehanna, 2008. The effect of natural fermented milk in the protection of liver from cancer. J. Nutr. Food Sci., 38: 578-592.
    CrossRef  |  Direct Link  |  
  31. Zaazou. M.H., M.A. El-yazeed, M. Galal, M.A Elrahman and N. Mehanna, 2007. A study of the effect of probiotic bacteria on level of streptococcus mutans in rats. J. Applied Sci. Res., 3: 1835-1841.
    Direct Link  |  
  32. Rayes, A.A.H. and N.S. Mehanna, 2007. Beneficial effect of isolated probiotic strain. J. Agric. Sci. Mansoura Univ., 32: 10139-10152.
  33. Yamamah, G.A., N.S. Mehanna, M.M. Salem, Z. Maha and K. Ola, 2005. The role of bifidobacterium bifidum and lactobacillus acidophilus as probiotics in controlling infantile watery diarrhea. Egypt. Med. J. Nati. Res. Center, 4: 29-34.
  34. Tawfik, N.F., O.M. Sharaf, B.A. Effat and N.S. Mahanna, 2004. Preserving domiati cheese using metabolites of Propinobacterium thoenii P-127. Polish J. Food Nutr. Sci., 13: 269-272.
    Direct Link  |  
  35. Ibrahim, G.A., N.S. Mehanna and D.A.G. El-Rab, 2004. Preparation and properties of set fermented milk containing inulin and different probiotics. Proceedings of the 9th Egyptian Conferences for Dairy Science and Technology, October 9-11, 2004, Cairo, Egypt, pp: 117-132.
  36. Mehanna, N.h., M.M.E. Salem, W.M. Zaky and A.B.A. El- Khalek, 2003. Viability of probiotic bacteria in functional fermented milk containing honey. Ann. Agric. Sci., Ain Shames Univ., Cairo, 48: 691-702.
  37. Mehanna, N.S., G.A. Ibrahim, and D.A.G. El-Rab, 2003. The influence of inulin addation on the quality of functional fermented milk. Minufiya J. Agric. Res., 28: 887-906.
  38. Mehanna, N.S. and I.M. Hosny, 2003. Functional fermented milk products with date. Arab Univ. J. Agric. Sci., 11: 247-259.
  39. Ibrahim, G.A., M.I. Kobeasy, N.S. Mehanna and G.A. El-Rab, 2003. Production of novel types of functional fermented milk products. Egypt. J. Nutr., 18: 1-23.
  40. Nayra, S.M., O.M. Sharaf, G.A. Ibrahim and N.F. Tawfik, 2002. Incorporation and viability of some probiotic bacteria in functional dairy food I. Soft cheese. Egypt. J. Dairy Sci., 30: 217-229.
  41. Mehanna, N.S., B.A. Effat, Nadia M.A. Dabiza, N.F. Tawfik and O.M. Sharaf, 2002. Incorporation and viability of some probiotic bacteria in functional dairy foods. II. hard cheese. Minufiya J. Agric. Res., 27 : 225-241.
  42. Sharaf, O.M., N.F. Tawfek and N.S. Mehanna, 1999. Utilization of permeate for propionic acid production. J. Agric. Sci. Mansoura Univ., 24: 811-816.
  43. Saleh, T.M. and N.S. Mehann, 1999. Effect of activation of the LP-system on composition and quality of Zabady made from refrigerated milk. Arab Univ. J. Agric. Sci., 7: 61-70.
  44. Mehanna, N.S., H.A. Murad and A.K. Enab, 1999. Fermentation activity of lactic acid bacteria in peanut milk and its utilization for beverage preparation. J. Agric. Sci. Mansoura Univ., 24: 1233-1240.
  45. Mehanna, N.S., 1999. Usage of permeate to produce β-galactosidase enzyme from genetically engineered yeast. Arab Univ. J. Agric. Sci., 7: 107-117.
  46. Mehanna, N.S., 1999. Antimicrobial activity of pediococcus acidilactici and pediococcus pentosaceus. J. Agric. Sci. Mansoura Univ., 24: 803-810.
  47. Mehanna, N.M., N.S. Mehanna and M.A.M. Moussa, 1999. Effect of activation of the LP-system prior to heat treatment on preservation of milk at different temperatures. Menofiya J. Agric. Res., 24: 213-223.
  48. Mehanna, N.S., N.F. Tawfek andv Sharaf, 1998. Utilization of some food industries wastes for production of dietary adjuncts cultures. Egypt. J. Appl. Sci., 13: 259-271.
  49. Mehanna, N.S., A. Gouda, A.I. El-Zayat, A.A. Abdel-Fatah and M.M. Yassien, 1998. The effect of salt, nisin and acidity on bacterial spores isolated from swollen feta cheese. Proceedings of the 7th Egyptian Conference Dairy Science and Technology, November 7-9, 1998, Cairo Egypt, pp: 145-152.
  50. El-Zayat, A.I., A.A. Abdel-Fatah, N.S. Mehanna and M.M. Yassien, 1998. Effect of salt and nisin on thermal resistance of bacterial spores isolated from swollen feta cheese. Menofiya J. Agric. Res., 23: 1575-1583.
  51. Abdel-Fatah, A.A., A. Gouda, A.I. El-Zayat, N.S. Mehanna and M.M. Yassien, 1998. Microbiological quality of raw materials in relation to quality of feta cheese. Egyptian J. Dairy Sci., 26: 309-318.
  52. Abbas, H.M., N.S. Mehanna, N.S. Abd-Rabow and A.K. Enab, 1998. Ice milk like product using peanut and whey protein concentrates. Menofiya J. Agric. Res., 23: 1563-1573.
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  53. Sharaf, O.M., N.S. Mehanna, K. El-Shafei and A.E. Metwally, 1996. Effect of using different starters on quality of Labneh. Ann. Agric. Sci. Ain Shams Univ., Cairo, 41: 901-912.
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  54. Mehanna, N.S., H.M. Abbas and A. Ismaiel, 1993. The transformant Saccharomyces cerevisiae culture as a rennet substitute in slurry model. J. Agric. Sci. Mansoura Univ., 18: 3057-3062.
  55. Mehanna, N.S., 1993. Effect of preservation technique on a transformant of Str. Salvarius subsp thermophilus. J. Agric. Sci. Mansoura Univ., 18: 3013-3017.
  56. El-Dairoty, R.K. and N.S. Mehanna, 1993. Lysogene among enterotoxin B producing staphylococci. Ann. Agric. Sci. Moshtohor, 31: 977-987.
  57. Abd-El-Rahman, H.A.M. and N.S. Mehanna, 1993. Genetically engineered yeast acquired amylase gene from aspergilus niger. Ann. Agric. Sci. Moshtohor, 31: 969-975.
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  58. Mehanna, N.S., 1992. A milk clotting enzyme-producing saccharomyces cerevisiae transformant. Egypt. J. Applied Sci., 8: 905-913.
  59. Mehanna, N.S. and H. El-Sayed, 1992. Examining toxigenicity of different food containers using a lysis induction test. Egypt. J. Applied Sci., 8: 903-910.
  60. Mehanna, N.S., H.A.M. Abd-El-Rahman and A.M.M. Ali, 1991. The construction of highly efficient saccharomyces cerevisiae cellulase producers. Egypt. J. Applied Sci., 7: 520-526.