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Journal of Food Technology Research

March 2016, Volume 3, 1, pp 1-11

Effect of Sodium Alginate Coating with Ascorbic Acid on Shelf Life of Raw Pork Meat

D. Gammariello


A. L. Incoronato


A. Conte


M. A. Del Nobile

D. Gammariello 1 A. L. Incoronato 1 A. Conte 1 M. A. Del Nobile 1 

  1. Department of Agricultural Sciences, Food and Environment, University of Foggia, Foggia, Italy 1

Pages: 1-11

DOI: 10.18488/journal.58/2016.3.1/

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The focus of this study was to evaluate the effect of sodium alginate coating loaded with ascorbic acid on shelf life of raw pork meat slices, used to prepare skewers. To the aim, the meat samples were first dipped in the sodium lactate solution (40% w/w) and then divided into 3 treatment groups: (i) control samples (dipped meat), (ii) coated meat, (iii) coated meat containing ascorbic acid (i.e. 500, 1000 and 1500 ppm). All samples were packaged under modified atmosphere packaging (50%O2/30%CO2/20%N2) and stored at 4±2°C. The samples were analysed for sensory and microbiological characteristics. The combination of dipping, active coating and MAP improved the sensory quality of packaged skewers. In contrast active coating does not considerable effect in slowing down the growth of spoilage microorganisms. Sample coated with 1500 ppm ascorbic acid displayed the longest shelf life, equal to 8.9 days, which was about 60% longer than the control.

Contribution/ Originality
The paper's primary contribution is finding that edible active coatings can improve the meat quality by retarding sensorial and microbiological deterioration and functioning as carriers of active compounds. The results suggest that combined the dipping and the active coating with modified atmosphere packaging the freshness of meat is comparatively prolonged.


Processed meat, Coating with ascorbic acid, Shelf life, Dipping.


  1. Ahn, D.U. and K.C. Nam, 2004. Effects of ascorbic acid and antioxidants on color, lipid oxidation and volatiles of irradiated ground beef. Radiation Physics and Chemistry, 71(1): 149-154.
  2. Brewer, M.S., F. McKeith, S.E. Martin, A.W. Dallmier and J. Meyer, 1991. Sodium lactate effects on shelf-life, sensory, and physical characteristics of fresh pork sausage. Journal Food Science, 56(5): 1176-1178.
  3. Chidanandaiah, S.M.K., R.C. Keshri and M.K. Sanyal, 2009. Effect of sodium alginate coating w?th preservatives on the quality of meat patties during refrigerated (4±1°C) storage. Journal Muscle Foods, 20(3): 275-298.
  4. Chouliara, E., A. Karatapanis, I.N. Savvaidis and M.G. Kontominas, 2007. Combined effect of oregano essential oil and modified atmosphere packaging on shelf-life extension of fresh chicken breast meat, stored at 4°C. Food Microbiology, 24(6): 607-617.
  5. Chouliara, I. and M.G. Kontominas, 2006. Combined effect of thyme essential oil and modified atmosphere packaging to extend shelf life of fresh chicken meat. In: Recent progress in medicinal plants: Natural product J.N. Govil, V.K. Singh, K. Almad, R.Kr. Sharma (Eds). LLC, USA: Studium Press,15: 423-442.
  6. Cutter, C.N., 2006. Opportunities for bio-based packaging technologies to improve the quality and safety of fresh and further processed muscle foods. Meat Science, 74(1): 131-142.
  7. Cutter, C.N. and S.S. Sumner, 2002. Application of edible coatings on muscle foods. In: Protein-based films and coatings A. Gennadios (Eds). Boca Raton, FL: CRC Press. pp: 467-484.
  8. Daniels, R., 1973. Edible coatings and soluble packaging. Park Ridge, N.J: Noyes Data Corporation.
  9. Das, A.K., A.S.R. Anjaneyulu, A.K. Verma and N. Kondaiah, 2008. Effect of full-fat soy paste and soy granules on quality of goat meat patties. International Journal Food Science Technology, 43(3): 383-392.
  10. Del Nobile, M.A., A. Conte, M. Cannarsi and M. Sinigaglia, 2009. Strategies for prolonging the shelf life of minced beef patties. Journal Food Safety, 29(1): 14-25.
  11. Del Rìo, E., M. Panizo-Morán, M. Prieto, C. Alonso-Calleja and R. Capita, 2007. Effect of various chemical decontamination treatments on natural microflora and sensory characteristics of poultry. International Journal Food Microbiology, 115(3): 268-280.
  12. Diez, A.M., E.M. Santos, I. Jaime and J. Rovira, 2009. Effectiveness of combined preservation methods to extend the shelf life of Morcilla De Burgos. Meat Science, 81(1): 171-177.
  13. Earle, R.D., 1968. Method for preserving food by coating. US Patent 3,395,024.
  14. Earle, R.D. and D.H. Mckee, 1976. Process for treating fresh meats. US Patent 3,991,218.
  15. Earle, R.D. and C.E. Snyder, 1966. Method of preparing frozen seafood. US Patent 3,255,021.
  16. Esmer, O.K., R. Irkin, N. Degirmencioglu and A. Degirmencioglu, 2011. The effects of modified atmosphere gas composition on microbiological criteria, color and oxidation values of minced beef meat. Meat Science, 88(2): 221-226.
  17. Gammariello, D., A.L. Incoronato, A. Conte, F. Contò and N.M.A. Del, 2014b. A multi-step optimisation approach to extend burger shelf life. Basic Research Journal Food Science Technology, 1(2): 15-28.
  18. Gammariello, D., A.L. Incoronato, A. Conte and M.A. Del Nobile, 2014a. Use of sodium lactate and modified atmosphere packaging for extending the shelf life of ready-to-cook fresh meal. Packaging Technology Science, 28(2): 101–112. DOI 10.1002/pts.2092.
  19. Gennadios, A., M.A. Hanna and L.B. Kurth, 1997. Application of edible coating on meats, poultry and seafoods: A review. LW Technology, 30(4): 337-350.
  20. Gill, C.O. and M. Badoni, 2004. Effects of peroxyacetic acid, acidified sodium chlorite or lactic acid solutions on the microflora of chilled beef carcasses. International Journal Food Microbiology, 91(1): 43-50.
  21. ICMSF (International Commission on Microbiological Specifications for Foods) Microorganisms in Foods, 1986. Sampling for microbiological analysis: Principles and scientific applications. Toronto: University of Toronto Press, 2: 181-186.
  22. Jayasing, P., D.P. Cornforth, C.P. Brennand, C.E. Carpenter and D.R. Whittier, 2002. Sensory evaluation of ground beef stored in high-oxygen modified atmosphere packaging. Journal Food Science, 67(9): 3493-3496.
  23. Jensen, J.M., K.L. Robbins, K.J. Ryan, C. Homco-Ryan, F.K. McKeith and M.S. Brewer, 2003. Effects of lactic and acetic acid salts on quality characteristics of enhanced pork during retail display. Meat Science, 63(4): 501-508.
  24. Karabagias, I., A. Badeka and M.G. Kontominas, 2011. Shelf life extension of lamb meat using thyme or oregano essential oils and modified atmosphere packaging. Meat Science, 88(1): 109-116.
  25. Khan, M.I., M.N. Adrees, M.R. Tariq and M. Sohaib, 2013. Application of edible coating for improving meat quality: A review. Pakistan Journal Food Science, 23(2): 71-19.
  26. Kuo, J.C., J. Diesel and L. Leistner, 1994. Effects of sodium lactate and storage temperature on growth and survival of salmonella in Chinese sausage. Food Science, 21: 182-196.
  27. Lacroix, M., B. Ouattara, L. Saucier, M. Giroux and W. Smoragiewicz, 2004. Effect of gamma irradiation in presence of ascorbic acid on microbial composition and TBARS concentration of ground beef coated with an edible active coating. Radiation Physics and Chemistry, 71: 71-75.
  28. Lorenzo, J.M. and M. Gómez, 2012. Shelf life of fresh foal meat under MAP, overwrap and vacuum packaging conditions. Meat Science, 92(4): 610-618.
  29. Mastromatteo, M., A.L. Incoronato, A. Conte and N.M.A. Del, 2011. Shelf life of reduced pork back-fat content sausages as affected by antimicrobial compounds and modified atmosphere packaging. International Journal Food Microbiology, 150(1): 1-7.
  30. Mastromatteo, M., A. Lucera, M. Sinigaglia and M.R. Corbo, 2010. Use of lysozyme, nisin, and EDTA combined treatments for maintaining quality of packed ostrich patties. Journal Food Science, 75(3): 178-186.
  31. McMillin, K.W., 2008. Where is MAP going? A review and future potential of modified atmosphere packaging for meat. Meat Science, 80(1): 43-65.
  32. Papadopoulos, L.S., R.K. Miller, G.R. Acuff, C. Vanderzant and H.R. Cross, 1991. Effect of sodium lactate on microbial and chemical composition of cooked beef during storage. J Food Science, 56(2): 341-347.
  33. Sallam, K.I. and K. Samejima, 2004. Microbiological and chemical quality of ground beef treated with sodium lactate and sodium chloride during refrigerated storage. Lebensmittel- Wissenschaft Technologie, 37(8): 865-871.
  34. Sanchez-Escalante, A., D. Djenane, G. Torrescano, J.A. Beltran and P. Roncales, 2001. The effects of ascorbic acid, taurine, carnosine and rosemary powder on colour and lipid stability of beef patties packaged in modified atmosphere. Meat Science, 58(4): 421-429.
  35. Schaefer, D.M., G. Liu, C. Faustman and M.C. Yin, 1995. Supranutritional administration of vitamins E and C improves oxidative stability of beef. Journal Nutritional, 125(6): 1792s-1798s.
  36. Seydim, A.C. and G. Saricus, 2006. Antimicrobial activity of whey protein based edible films incorporated with oregano, rosemary and garlic essential oils. Food Research International, 39(5): 639-644.
  37. Shelef, L.A., 1994. Antimicrobial effects of lactates: A review. Journal Food Protection, 57(5): 445-450.
  38. Shivas, S.D., D.H. Kropf, M.C. Hunt, C.L. Kastner, J.L.A. Kendall and A.D. Dayton, 1984. Effects of ascorbic acid on display life of ground beef. Journal Food Protection, 47: 11-15.
  39. Smith, J.P., H.S. Ramaswamy and B.K. Simpson, 1990. Developments in food packaging technology. Part II. Storage aspects. Trends Food Science Technology, 1(5): 111-118.
  40. Wang, F.S., 2000. Effects of three preservatives on the shelf life of vacuum packaged Chinese-style sausage stored at 20°C. Meat Science, 56(1): 67-71.


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