The Experts below are selected from a list of 20898 Experts worldwide ranked by ideXlab platform

John M Krochta - One of the best experts on this subject based on the ideXlab platform.

  • oxygen barrier performance of whey protein coated Plastic Films as affected by temperature relative humidity base film and protein type
    Journal of Food Engineering, 2006
    Co-Authors: Seok-in Hong, John M Krochta
    Abstract:

    Abstract Oxygen permeation properties of whey-protein-coated Plastic Films were examined to compare their oxygen-barrier performance as affected by temperature (15–40 °C), relative humidity (30–85% RH), base film (PE: polyethylene & PP: polypropylene), and protein type (WPI: whey protein isolate & WPC: whey protein concentrate). The resulting whey-protein-coated Films showed increase in oxygen permeability (OP) as temperature increased, with an Arrhenius behavior, and activation energy of 10.9–12.1 kcal/mol, regardless of types of whey proteins and base Films. Relative humidity had an exponential effect on OP of the coated Films, with excellent oxygen-barrier properties at low to intermediate RH. Overall OP values of the whey-protein-coated PP were significantly lower than those of the coated PE, mainly due to the intrinsic permeation characteristics of the base Films. No remarkable differences could be observed in the oxygen-barrier performance between WPI and WPC coatings. Results suggest that whey protein coatings could work successfully as an oxygen barrier under low moisture conditions and have potential as an alternative to existing expensive synthetic oxygen-barrier polymers in composite structures for food packaging applications.

  • Oxygen barrier performance of whey-protein-coated Plastic Films as affected by temperature, relative humidity, base film and protein type
    Journal of Food Engineering, 2006
    Co-Authors: Seok-in Hong, John M Krochta
    Abstract:

    Oxygen permeation properties of whey-protein-coated Plastic Films were examined to compare their oxygen-barrier performance as affected by temperature (15-40 °C), relative humidity (30-85% RH), base film (PE: polyethylene & PP: polypropylene), and protein type (WPI: whey protein isolate & WPC: whey protein concentrate). The resulting whey-protein-coated Films showed increase in oxygen permeability (OP) as temperature increased, with an Arrhenius behavior, and activation energy of 10.9-12.1 kcal/mol, regardless of types of whey proteins and base Films. Relative humidity had an exponential effect on OP of the coated Films, with excellent oxygen-barrier properties at low to intermediate RH. Overall OP values of the whey-protein-coated PP were significantly lower than those of the coated PE, mainly due to the intrinsic permeation characteristics of the base Films. No remarkable differences could be observed in the oxygen-barrier performance between WPI and WPC coatings. Results suggest that whey protein coatings could work successfully as an oxygen barrier under low moisture conditions and have potential as an alternative to existing expensive synthetic oxygen-barrier polymers in composite structures for food packaging applications. © 2005 Elsevier Ltd. All rights reserved.

Haiqiang Chen - One of the best experts on this subject based on the ideXlab platform.

  • effectiveness of chitosan coated Plastic Films incorporating antimicrobials in inhibition of listeria monocytogenes on cold smoked salmon
    International Journal of Food Microbiology, 2008
    Co-Authors: Mu Ye, Hudaa Neetoo, Haiqiang Chen
    Abstract:

    Abstract The objective of this study was to evaluate the efficacy of chitosan-coated Plastic Films incorporating five Generally Recognized as Safe (GRAS) antimicrobials (nisin, sodium lactate (SL), sodium diacetate (SD), potassium sorbate (PS) and sodium benzoate (SB)) against Listeria monocytogenes on cold-smoked salmon. Salmon samples were surface-inoculated with a five-strain cocktail of L. monocytogenes and packaged in chitosan-coated Plastic Films containing 500 IU/cm2 of nisin, 9 mg/cm2 of SL, 0.5 mg/cm2 of SD, 0.6 mg/cm2 of PS, or 0.2 mg/cm2 of SB, and stored at room temperature (ca. 20 °C) for 10 days. The film incorporating SL was the most effective, completely inhibiting the growth of L. monocytogenes during 10 days of storage. L. monocytogenes in samples packaged in the other four antimicrobial Films grew, but the increase in counts was lower than the control. The antilisterial efficacy of Films containing lower concentrations of SL (2.3 mg/cm2 and 4.5 mg/cm2) and binary combinations SL, PS, SD, SB and nisin were subsequently evaluated. Among all the treatments, chitosan-coated Plastic Films with 4.5 mg/cm2 SL, 4.5 mg/cm2 SL–0.6 mg/cm2 PS and 2.3 mg/cm2 SL–500 IU/cm2 nisin were the most effective. These three most effective antimicrobial Films were then tested at refrigerated temperature. They completely inhibited the growth of L. monocytogenes on smoked salmon for at least 6 weeks. Chitosan-coated Plastic Films containing 4.5 mg/cm2 SL can potentially assist the smoked-salmon processing industry in their efforts to control L. monocytogenes.

  • use of nisin coated Plastic Films to control listeria monocytogenes on vacuum packaged cold smoked salmon
    International Journal of Food Microbiology, 2008
    Co-Authors: Hudaa Neetoo, Mu Ye, Rolf D Joerger, D T Hicks, Haiqiang Chen, Dallas G Hoover
    Abstract:

    Abstract Cold-smoked (Salmo salar) salmon samples were surface-inoculated with a cocktail of three nisin-resistant strains of L. monocytogenes (PSU1, PSU2 and PSU21) to a level of approximately 5 × 102 or 5 × 105 CFU/cm2 of salmon surface. The inoculated smoked salmon samples were vacuum-packaged with control film (no nisin) or nisin-coated Plastic Films and stored at either 4 or 10 °C. When the inoculated smoked salmon samples were packaged with film coated with 2000 IU/cm2 of nisin, a reduction of 3.9 log CFU/cm2 (compared with control) was achieved at either temperature for samples inoculated with 5 × 102 CFU/cm2 of L. monocytogenes after 56 (4 °C) and 49 (10 °C) days of storage while reductions of 2.4 and 0.7 log CFU/cm2 were achieved for samples inoculated with a high level of L. monocytogenes (5 × 105 CFU/cm2) after 58 (4 °C) and 43 (10 °C) days, respectively. For samples packaged in film coated with 500 IU/cm2 of nisin, reductions of 0.5 and 1.7 log CFU/cm2 were achieved for samples inoculated with a low level of L. monocytogenes (5 × 102 CFU/cm2) after 56 (4 °C) and 49 (10 °C) days of storage while reductions of 1.8 and 0.8 log CFU/cm2 were achieved for samples inoculated with high level of L. monocytogenes after 58(4 °C) and 43 (10 °C) days, respectively. In addition, nisin inhibited the proliferation of background microbiota on smoked salmon in a concentration-dependent manner at both storage temperatures although the bacteriostatic effect was more pronounced at refrigeration temperature. This work highlights the potential for incorporating nisin into Plastic Films for enhancing the microbial safety of smoked salmon as well as controlling its microbial spoilage.

  • control of listeria monocytogenes on ham steaks by antimicrobials incorporated into chitosan coated Plastic Films
    Food Microbiology, 2008
    Co-Authors: Mu Ye, Hudaa Neetoo, Haiqiang Chen
    Abstract:

    Abstract Contamination of ready-to-eat (RTE) meat products such as ham steaks with Listeria monocytogenes has been a concern for the meat processing industry. The objective of this study was to evaluate the antilisterial efficacy of chitosan-coated Plastic Films alone or incorporating five generally recognized as safe (GRAS) antimicrobials. Effect of chitosan-coated Plastic film on the growth of L. monocytogenes was first investigated in an aqueous system of culture medium broth and chitosan-coated Films were able to inhibit the growth of L. monocytogenes in a concentration-dependent manner. However, chitosan-coated Plastic Films were not able to control the growth of L. monocytogenes on ham steaks. Therefore, five GRAS antimicrobials were subsequently incorporated into chitosan-coated Plastic Films to enhance their antilisterial effectiveness. Ham steaks were surface-inoculated with a five-strain cocktail of L. monocytogenes and then packaged in chitosan-coated Plastic Films containing 500 IU/cm 2 of nisin, 0.01 g/cm 2 of sodium lactate (SL), 0.0025 g/cm 2 of sodium diacetate, 0.003 g/cm 2 of potassium sorbate (PB), or 0.001 g/cm 2 of sodium benzoate (SB). The samples were stored at room temperature (ca. 20 °C) for 10 days. Incorporating antimicrobials into chitosan-coated Plastic Films slowed down or inhibited the growth of L. monocytogenes . The chitosan-coated Plastic film containing SL was the most effective antimicrobial film and its efficacy against L. monocytogenes on ham steaks was evaluated during 12-week storage at 4 °C. The film showed excellent long-term antilisterial effect with the counts of L. monocytogenes being slightly lower than the initial inoculum. Chitosan-coated Plastic Films containing 0.001 g/cm 2 of SL have a potential to be used on ham steaks to control L. monocytogenes .

  • Effectiveness of chitosan-coated Plastic Films incorporating antimicrobials in inhibition of Listeria monocytogenes on cold-smoked salmon
    International Journal of Food Microbiology, 2008
    Co-Authors: Mu Ye, Hudaa Neetoo, Haiqiang Chen
    Abstract:

    The objective of this study was to evaluate the efficacy of chitosan-coated Plastic Films incorporating five Generally Recognized as Safe (GRAS) antimicrobials (nisin, sodium lactate (SL), sodium diacetate (SD), potassium sorbate (PS) and sodium benzoate (SB)) against Listeria monocytogenes on cold-smoked salmon. Salmon samples were surface-inoculated with a five-strain cocktail of L. monocytogenes and packaged in chitosan-coated Plastic Films containing 500 IU/cm2of nisin, 9 mg/cm2of SL, 0.5 mg/cm2of SD, 0.6 mg/cm2of PS, or 0.2 mg/cm2of SB, and stored at room temperature (ca. 20 °C) for 10 days. The film incorporating SL was the most effective, completely inhibiting the growth of L. monocytogenes during 10 days of storage. L. monocytogenes in samples packaged in the other four antimicrobial Films grew, but the increase in counts was lower than the control. The antilisterial efficacy of Films containing lower concentrations of SL (2.3 mg/cm2and 4.5 mg/cm2) and binary combinations SL, PS, SD, SB and nisin were subsequently evaluated. Among all the treatments, chitosan-coated Plastic Films with 4.5 mg/cm2SL, 4.5 mg/cm2SL-0.6 mg/cm2PS and 2.3 mg/cm2SL-500 IU/cm2nisin were the most effective. These three most effective antimicrobial Films were then tested at refrigerated temperature. They completely inhibited the growth of L. monocytogenes on smoked salmon for at least 6 weeks. Chitosan-coated Plastic Films containing 4.5 mg/cm2SL can potentially assist the smoked-salmon processing industry in their efforts to control L. monocytogenes. © 2008 Elsevier B.V. All rights reserved.

  • Control of Listeria monocytogenes on ham steaks by antimicrobials incorporated into chitosan-coated Plastic Films
    Food Microbiology, 2008
    Co-Authors: Mu Ye, Hudaa Neetoo, Haiqiang Chen
    Abstract:

    Contamination of ready-to-eat (RTE) meat products such as ham steaks with Listeria monocytogenes has been a concern for the meat processing industry. The objective of this study was to evaluate the antilisterial efficacy of chitosan-coated Plastic Films alone or incorporating five generally recognized as safe (GRAS) antimicrobials. Effect of chitosan-coated Plastic film on the growth of L. monocytogenes was first investigated in an aqueous system of culture medium broth and chitosan-coated Films were able to inhibit the growth of L. monocytogenes in a concentration-dependent manner. However, chitosan-coated Plastic Films were not able to control the growth of L. monocytogenes on ham steaks. Therefore, five GRAS antimicrobials were subsequently incorporated into chitosan-coated Plastic Films to enhance their antilisterial effectiveness. Ham steaks were surface-inoculated with a five-strain cocktail of L. monocytogenes and then packaged in chitosan-coated Plastic Films containing 500 IU/cm2 of nisin, 0.01 g/cm2 of sodium lactate (SL), 0.0025 g/cm2 of sodium diacetate, 0.003 g/cm2 of potassium sorbate (PB), or 0.001 g/cm2 of sodium benzoate (SB). The samples were stored at room temperature (ca. 20 °C) for 10 days. Incorporating antimicrobials into chitosan-coated Plastic Films slowed down or inhibited the growth of L. monocytogenes. The chitosan-coated Plastic film containing SL was the most effective antimicrobial film and its efficacy against L. monocytogenes on ham steaks was evaluated during 12-week storage at 4 °C. The film showed excellent long-term antilisterial effect with the counts of L. monocytogenes being slightly lower than the initial inoculum. Chitosan-coated Plastic Films containing 0.001 g/cm2 of SL have a potential to be used on ham steaks to control L. monocytogenes. © 2007 Elsevier Ltd. All rights reserved.

Mu Ye - One of the best experts on this subject based on the ideXlab platform.

  • effectiveness of chitosan coated Plastic Films incorporating antimicrobials in inhibition of listeria monocytogenes on cold smoked salmon
    International Journal of Food Microbiology, 2008
    Co-Authors: Mu Ye, Hudaa Neetoo, Haiqiang Chen
    Abstract:

    Abstract The objective of this study was to evaluate the efficacy of chitosan-coated Plastic Films incorporating five Generally Recognized as Safe (GRAS) antimicrobials (nisin, sodium lactate (SL), sodium diacetate (SD), potassium sorbate (PS) and sodium benzoate (SB)) against Listeria monocytogenes on cold-smoked salmon. Salmon samples were surface-inoculated with a five-strain cocktail of L. monocytogenes and packaged in chitosan-coated Plastic Films containing 500 IU/cm2 of nisin, 9 mg/cm2 of SL, 0.5 mg/cm2 of SD, 0.6 mg/cm2 of PS, or 0.2 mg/cm2 of SB, and stored at room temperature (ca. 20 °C) for 10 days. The film incorporating SL was the most effective, completely inhibiting the growth of L. monocytogenes during 10 days of storage. L. monocytogenes in samples packaged in the other four antimicrobial Films grew, but the increase in counts was lower than the control. The antilisterial efficacy of Films containing lower concentrations of SL (2.3 mg/cm2 and 4.5 mg/cm2) and binary combinations SL, PS, SD, SB and nisin were subsequently evaluated. Among all the treatments, chitosan-coated Plastic Films with 4.5 mg/cm2 SL, 4.5 mg/cm2 SL–0.6 mg/cm2 PS and 2.3 mg/cm2 SL–500 IU/cm2 nisin were the most effective. These three most effective antimicrobial Films were then tested at refrigerated temperature. They completely inhibited the growth of L. monocytogenes on smoked salmon for at least 6 weeks. Chitosan-coated Plastic Films containing 4.5 mg/cm2 SL can potentially assist the smoked-salmon processing industry in their efforts to control L. monocytogenes.

  • use of nisin coated Plastic Films to control listeria monocytogenes on vacuum packaged cold smoked salmon
    International Journal of Food Microbiology, 2008
    Co-Authors: Hudaa Neetoo, Mu Ye, Rolf D Joerger, D T Hicks, Haiqiang Chen, Dallas G Hoover
    Abstract:

    Abstract Cold-smoked (Salmo salar) salmon samples were surface-inoculated with a cocktail of three nisin-resistant strains of L. monocytogenes (PSU1, PSU2 and PSU21) to a level of approximately 5 × 102 or 5 × 105 CFU/cm2 of salmon surface. The inoculated smoked salmon samples were vacuum-packaged with control film (no nisin) or nisin-coated Plastic Films and stored at either 4 or 10 °C. When the inoculated smoked salmon samples were packaged with film coated with 2000 IU/cm2 of nisin, a reduction of 3.9 log CFU/cm2 (compared with control) was achieved at either temperature for samples inoculated with 5 × 102 CFU/cm2 of L. monocytogenes after 56 (4 °C) and 49 (10 °C) days of storage while reductions of 2.4 and 0.7 log CFU/cm2 were achieved for samples inoculated with a high level of L. monocytogenes (5 × 105 CFU/cm2) after 58 (4 °C) and 43 (10 °C) days, respectively. For samples packaged in film coated with 500 IU/cm2 of nisin, reductions of 0.5 and 1.7 log CFU/cm2 were achieved for samples inoculated with a low level of L. monocytogenes (5 × 102 CFU/cm2) after 56 (4 °C) and 49 (10 °C) days of storage while reductions of 1.8 and 0.8 log CFU/cm2 were achieved for samples inoculated with high level of L. monocytogenes after 58(4 °C) and 43 (10 °C) days, respectively. In addition, nisin inhibited the proliferation of background microbiota on smoked salmon in a concentration-dependent manner at both storage temperatures although the bacteriostatic effect was more pronounced at refrigeration temperature. This work highlights the potential for incorporating nisin into Plastic Films for enhancing the microbial safety of smoked salmon as well as controlling its microbial spoilage.

  • control of listeria monocytogenes on ham steaks by antimicrobials incorporated into chitosan coated Plastic Films
    Food Microbiology, 2008
    Co-Authors: Mu Ye, Hudaa Neetoo, Haiqiang Chen
    Abstract:

    Abstract Contamination of ready-to-eat (RTE) meat products such as ham steaks with Listeria monocytogenes has been a concern for the meat processing industry. The objective of this study was to evaluate the antilisterial efficacy of chitosan-coated Plastic Films alone or incorporating five generally recognized as safe (GRAS) antimicrobials. Effect of chitosan-coated Plastic film on the growth of L. monocytogenes was first investigated in an aqueous system of culture medium broth and chitosan-coated Films were able to inhibit the growth of L. monocytogenes in a concentration-dependent manner. However, chitosan-coated Plastic Films were not able to control the growth of L. monocytogenes on ham steaks. Therefore, five GRAS antimicrobials were subsequently incorporated into chitosan-coated Plastic Films to enhance their antilisterial effectiveness. Ham steaks were surface-inoculated with a five-strain cocktail of L. monocytogenes and then packaged in chitosan-coated Plastic Films containing 500 IU/cm 2 of nisin, 0.01 g/cm 2 of sodium lactate (SL), 0.0025 g/cm 2 of sodium diacetate, 0.003 g/cm 2 of potassium sorbate (PB), or 0.001 g/cm 2 of sodium benzoate (SB). The samples were stored at room temperature (ca. 20 °C) for 10 days. Incorporating antimicrobials into chitosan-coated Plastic Films slowed down or inhibited the growth of L. monocytogenes . The chitosan-coated Plastic film containing SL was the most effective antimicrobial film and its efficacy against L. monocytogenes on ham steaks was evaluated during 12-week storage at 4 °C. The film showed excellent long-term antilisterial effect with the counts of L. monocytogenes being slightly lower than the initial inoculum. Chitosan-coated Plastic Films containing 0.001 g/cm 2 of SL have a potential to be used on ham steaks to control L. monocytogenes .

  • Effectiveness of chitosan-coated Plastic Films incorporating antimicrobials in inhibition of Listeria monocytogenes on cold-smoked salmon
    International Journal of Food Microbiology, 2008
    Co-Authors: Mu Ye, Hudaa Neetoo, Haiqiang Chen
    Abstract:

    The objective of this study was to evaluate the efficacy of chitosan-coated Plastic Films incorporating five Generally Recognized as Safe (GRAS) antimicrobials (nisin, sodium lactate (SL), sodium diacetate (SD), potassium sorbate (PS) and sodium benzoate (SB)) against Listeria monocytogenes on cold-smoked salmon. Salmon samples were surface-inoculated with a five-strain cocktail of L. monocytogenes and packaged in chitosan-coated Plastic Films containing 500 IU/cm2of nisin, 9 mg/cm2of SL, 0.5 mg/cm2of SD, 0.6 mg/cm2of PS, or 0.2 mg/cm2of SB, and stored at room temperature (ca. 20 °C) for 10 days. The film incorporating SL was the most effective, completely inhibiting the growth of L. monocytogenes during 10 days of storage. L. monocytogenes in samples packaged in the other four antimicrobial Films grew, but the increase in counts was lower than the control. The antilisterial efficacy of Films containing lower concentrations of SL (2.3 mg/cm2and 4.5 mg/cm2) and binary combinations SL, PS, SD, SB and nisin were subsequently evaluated. Among all the treatments, chitosan-coated Plastic Films with 4.5 mg/cm2SL, 4.5 mg/cm2SL-0.6 mg/cm2PS and 2.3 mg/cm2SL-500 IU/cm2nisin were the most effective. These three most effective antimicrobial Films were then tested at refrigerated temperature. They completely inhibited the growth of L. monocytogenes on smoked salmon for at least 6 weeks. Chitosan-coated Plastic Films containing 4.5 mg/cm2SL can potentially assist the smoked-salmon processing industry in their efforts to control L. monocytogenes. © 2008 Elsevier B.V. All rights reserved.

  • Control of Listeria monocytogenes on ham steaks by antimicrobials incorporated into chitosan-coated Plastic Films
    Food Microbiology, 2008
    Co-Authors: Mu Ye, Hudaa Neetoo, Haiqiang Chen
    Abstract:

    Contamination of ready-to-eat (RTE) meat products such as ham steaks with Listeria monocytogenes has been a concern for the meat processing industry. The objective of this study was to evaluate the antilisterial efficacy of chitosan-coated Plastic Films alone or incorporating five generally recognized as safe (GRAS) antimicrobials. Effect of chitosan-coated Plastic film on the growth of L. monocytogenes was first investigated in an aqueous system of culture medium broth and chitosan-coated Films were able to inhibit the growth of L. monocytogenes in a concentration-dependent manner. However, chitosan-coated Plastic Films were not able to control the growth of L. monocytogenes on ham steaks. Therefore, five GRAS antimicrobials were subsequently incorporated into chitosan-coated Plastic Films to enhance their antilisterial effectiveness. Ham steaks were surface-inoculated with a five-strain cocktail of L. monocytogenes and then packaged in chitosan-coated Plastic Films containing 500 IU/cm2 of nisin, 0.01 g/cm2 of sodium lactate (SL), 0.0025 g/cm2 of sodium diacetate, 0.003 g/cm2 of potassium sorbate (PB), or 0.001 g/cm2 of sodium benzoate (SB). The samples were stored at room temperature (ca. 20 °C) for 10 days. Incorporating antimicrobials into chitosan-coated Plastic Films slowed down or inhibited the growth of L. monocytogenes. The chitosan-coated Plastic film containing SL was the most effective antimicrobial film and its efficacy against L. monocytogenes on ham steaks was evaluated during 12-week storage at 4 °C. The film showed excellent long-term antilisterial effect with the counts of L. monocytogenes being slightly lower than the initial inoculum. Chitosan-coated Plastic Films containing 0.001 g/cm2 of SL have a potential to be used on ham steaks to control L. monocytogenes. © 2007 Elsevier Ltd. All rights reserved.

Seok-in Hong - One of the best experts on this subject based on the ideXlab platform.

  • oxygen barrier performance of whey protein coated Plastic Films as affected by temperature relative humidity base film and protein type
    Journal of Food Engineering, 2006
    Co-Authors: Seok-in Hong, John M Krochta
    Abstract:

    Abstract Oxygen permeation properties of whey-protein-coated Plastic Films were examined to compare their oxygen-barrier performance as affected by temperature (15–40 °C), relative humidity (30–85% RH), base film (PE: polyethylene & PP: polypropylene), and protein type (WPI: whey protein isolate & WPC: whey protein concentrate). The resulting whey-protein-coated Films showed increase in oxygen permeability (OP) as temperature increased, with an Arrhenius behavior, and activation energy of 10.9–12.1 kcal/mol, regardless of types of whey proteins and base Films. Relative humidity had an exponential effect on OP of the coated Films, with excellent oxygen-barrier properties at low to intermediate RH. Overall OP values of the whey-protein-coated PP were significantly lower than those of the coated PE, mainly due to the intrinsic permeation characteristics of the base Films. No remarkable differences could be observed in the oxygen-barrier performance between WPI and WPC coatings. Results suggest that whey protein coatings could work successfully as an oxygen barrier under low moisture conditions and have potential as an alternative to existing expensive synthetic oxygen-barrier polymers in composite structures for food packaging applications.

  • Oxygen barrier performance of whey-protein-coated Plastic Films as affected by temperature, relative humidity, base film and protein type
    Journal of Food Engineering, 2006
    Co-Authors: Seok-in Hong, John M Krochta
    Abstract:

    Oxygen permeation properties of whey-protein-coated Plastic Films were examined to compare their oxygen-barrier performance as affected by temperature (15-40 °C), relative humidity (30-85% RH), base film (PE: polyethylene & PP: polypropylene), and protein type (WPI: whey protein isolate & WPC: whey protein concentrate). The resulting whey-protein-coated Films showed increase in oxygen permeability (OP) as temperature increased, with an Arrhenius behavior, and activation energy of 10.9-12.1 kcal/mol, regardless of types of whey proteins and base Films. Relative humidity had an exponential effect on OP of the coated Films, with excellent oxygen-barrier properties at low to intermediate RH. Overall OP values of the whey-protein-coated PP were significantly lower than those of the coated PE, mainly due to the intrinsic permeation characteristics of the base Films. No remarkable differences could be observed in the oxygen-barrier performance between WPI and WPC coatings. Results suggest that whey protein coatings could work successfully as an oxygen barrier under low moisture conditions and have potential as an alternative to existing expensive synthetic oxygen-barrier polymers in composite structures for food packaging applications. © 2005 Elsevier Ltd. All rights reserved.

Hudaa Neetoo - One of the best experts on this subject based on the ideXlab platform.

  • effectiveness of chitosan coated Plastic Films incorporating antimicrobials in inhibition of listeria monocytogenes on cold smoked salmon
    International Journal of Food Microbiology, 2008
    Co-Authors: Mu Ye, Hudaa Neetoo, Haiqiang Chen
    Abstract:

    Abstract The objective of this study was to evaluate the efficacy of chitosan-coated Plastic Films incorporating five Generally Recognized as Safe (GRAS) antimicrobials (nisin, sodium lactate (SL), sodium diacetate (SD), potassium sorbate (PS) and sodium benzoate (SB)) against Listeria monocytogenes on cold-smoked salmon. Salmon samples were surface-inoculated with a five-strain cocktail of L. monocytogenes and packaged in chitosan-coated Plastic Films containing 500 IU/cm2 of nisin, 9 mg/cm2 of SL, 0.5 mg/cm2 of SD, 0.6 mg/cm2 of PS, or 0.2 mg/cm2 of SB, and stored at room temperature (ca. 20 °C) for 10 days. The film incorporating SL was the most effective, completely inhibiting the growth of L. monocytogenes during 10 days of storage. L. monocytogenes in samples packaged in the other four antimicrobial Films grew, but the increase in counts was lower than the control. The antilisterial efficacy of Films containing lower concentrations of SL (2.3 mg/cm2 and 4.5 mg/cm2) and binary combinations SL, PS, SD, SB and nisin were subsequently evaluated. Among all the treatments, chitosan-coated Plastic Films with 4.5 mg/cm2 SL, 4.5 mg/cm2 SL–0.6 mg/cm2 PS and 2.3 mg/cm2 SL–500 IU/cm2 nisin were the most effective. These three most effective antimicrobial Films were then tested at refrigerated temperature. They completely inhibited the growth of L. monocytogenes on smoked salmon for at least 6 weeks. Chitosan-coated Plastic Films containing 4.5 mg/cm2 SL can potentially assist the smoked-salmon processing industry in their efforts to control L. monocytogenes.

  • use of nisin coated Plastic Films to control listeria monocytogenes on vacuum packaged cold smoked salmon
    International Journal of Food Microbiology, 2008
    Co-Authors: Hudaa Neetoo, Mu Ye, Rolf D Joerger, D T Hicks, Haiqiang Chen, Dallas G Hoover
    Abstract:

    Abstract Cold-smoked (Salmo salar) salmon samples were surface-inoculated with a cocktail of three nisin-resistant strains of L. monocytogenes (PSU1, PSU2 and PSU21) to a level of approximately 5 × 102 or 5 × 105 CFU/cm2 of salmon surface. The inoculated smoked salmon samples were vacuum-packaged with control film (no nisin) or nisin-coated Plastic Films and stored at either 4 or 10 °C. When the inoculated smoked salmon samples were packaged with film coated with 2000 IU/cm2 of nisin, a reduction of 3.9 log CFU/cm2 (compared with control) was achieved at either temperature for samples inoculated with 5 × 102 CFU/cm2 of L. monocytogenes after 56 (4 °C) and 49 (10 °C) days of storage while reductions of 2.4 and 0.7 log CFU/cm2 were achieved for samples inoculated with a high level of L. monocytogenes (5 × 105 CFU/cm2) after 58 (4 °C) and 43 (10 °C) days, respectively. For samples packaged in film coated with 500 IU/cm2 of nisin, reductions of 0.5 and 1.7 log CFU/cm2 were achieved for samples inoculated with a low level of L. monocytogenes (5 × 102 CFU/cm2) after 56 (4 °C) and 49 (10 °C) days of storage while reductions of 1.8 and 0.8 log CFU/cm2 were achieved for samples inoculated with high level of L. monocytogenes after 58(4 °C) and 43 (10 °C) days, respectively. In addition, nisin inhibited the proliferation of background microbiota on smoked salmon in a concentration-dependent manner at both storage temperatures although the bacteriostatic effect was more pronounced at refrigeration temperature. This work highlights the potential for incorporating nisin into Plastic Films for enhancing the microbial safety of smoked salmon as well as controlling its microbial spoilage.

  • control of listeria monocytogenes on ham steaks by antimicrobials incorporated into chitosan coated Plastic Films
    Food Microbiology, 2008
    Co-Authors: Mu Ye, Hudaa Neetoo, Haiqiang Chen
    Abstract:

    Abstract Contamination of ready-to-eat (RTE) meat products such as ham steaks with Listeria monocytogenes has been a concern for the meat processing industry. The objective of this study was to evaluate the antilisterial efficacy of chitosan-coated Plastic Films alone or incorporating five generally recognized as safe (GRAS) antimicrobials. Effect of chitosan-coated Plastic film on the growth of L. monocytogenes was first investigated in an aqueous system of culture medium broth and chitosan-coated Films were able to inhibit the growth of L. monocytogenes in a concentration-dependent manner. However, chitosan-coated Plastic Films were not able to control the growth of L. monocytogenes on ham steaks. Therefore, five GRAS antimicrobials were subsequently incorporated into chitosan-coated Plastic Films to enhance their antilisterial effectiveness. Ham steaks were surface-inoculated with a five-strain cocktail of L. monocytogenes and then packaged in chitosan-coated Plastic Films containing 500 IU/cm 2 of nisin, 0.01 g/cm 2 of sodium lactate (SL), 0.0025 g/cm 2 of sodium diacetate, 0.003 g/cm 2 of potassium sorbate (PB), or 0.001 g/cm 2 of sodium benzoate (SB). The samples were stored at room temperature (ca. 20 °C) for 10 days. Incorporating antimicrobials into chitosan-coated Plastic Films slowed down or inhibited the growth of L. monocytogenes . The chitosan-coated Plastic film containing SL was the most effective antimicrobial film and its efficacy against L. monocytogenes on ham steaks was evaluated during 12-week storage at 4 °C. The film showed excellent long-term antilisterial effect with the counts of L. monocytogenes being slightly lower than the initial inoculum. Chitosan-coated Plastic Films containing 0.001 g/cm 2 of SL have a potential to be used on ham steaks to control L. monocytogenes .

  • Effectiveness of chitosan-coated Plastic Films incorporating antimicrobials in inhibition of Listeria monocytogenes on cold-smoked salmon
    International Journal of Food Microbiology, 2008
    Co-Authors: Mu Ye, Hudaa Neetoo, Haiqiang Chen
    Abstract:

    The objective of this study was to evaluate the efficacy of chitosan-coated Plastic Films incorporating five Generally Recognized as Safe (GRAS) antimicrobials (nisin, sodium lactate (SL), sodium diacetate (SD), potassium sorbate (PS) and sodium benzoate (SB)) against Listeria monocytogenes on cold-smoked salmon. Salmon samples were surface-inoculated with a five-strain cocktail of L. monocytogenes and packaged in chitosan-coated Plastic Films containing 500 IU/cm2of nisin, 9 mg/cm2of SL, 0.5 mg/cm2of SD, 0.6 mg/cm2of PS, or 0.2 mg/cm2of SB, and stored at room temperature (ca. 20 °C) for 10 days. The film incorporating SL was the most effective, completely inhibiting the growth of L. monocytogenes during 10 days of storage. L. monocytogenes in samples packaged in the other four antimicrobial Films grew, but the increase in counts was lower than the control. The antilisterial efficacy of Films containing lower concentrations of SL (2.3 mg/cm2and 4.5 mg/cm2) and binary combinations SL, PS, SD, SB and nisin were subsequently evaluated. Among all the treatments, chitosan-coated Plastic Films with 4.5 mg/cm2SL, 4.5 mg/cm2SL-0.6 mg/cm2PS and 2.3 mg/cm2SL-500 IU/cm2nisin were the most effective. These three most effective antimicrobial Films were then tested at refrigerated temperature. They completely inhibited the growth of L. monocytogenes on smoked salmon for at least 6 weeks. Chitosan-coated Plastic Films containing 4.5 mg/cm2SL can potentially assist the smoked-salmon processing industry in their efforts to control L. monocytogenes. © 2008 Elsevier B.V. All rights reserved.

  • Control of Listeria monocytogenes on ham steaks by antimicrobials incorporated into chitosan-coated Plastic Films
    Food Microbiology, 2008
    Co-Authors: Mu Ye, Hudaa Neetoo, Haiqiang Chen
    Abstract:

    Contamination of ready-to-eat (RTE) meat products such as ham steaks with Listeria monocytogenes has been a concern for the meat processing industry. The objective of this study was to evaluate the antilisterial efficacy of chitosan-coated Plastic Films alone or incorporating five generally recognized as safe (GRAS) antimicrobials. Effect of chitosan-coated Plastic film on the growth of L. monocytogenes was first investigated in an aqueous system of culture medium broth and chitosan-coated Films were able to inhibit the growth of L. monocytogenes in a concentration-dependent manner. However, chitosan-coated Plastic Films were not able to control the growth of L. monocytogenes on ham steaks. Therefore, five GRAS antimicrobials were subsequently incorporated into chitosan-coated Plastic Films to enhance their antilisterial effectiveness. Ham steaks were surface-inoculated with a five-strain cocktail of L. monocytogenes and then packaged in chitosan-coated Plastic Films containing 500 IU/cm2 of nisin, 0.01 g/cm2 of sodium lactate (SL), 0.0025 g/cm2 of sodium diacetate, 0.003 g/cm2 of potassium sorbate (PB), or 0.001 g/cm2 of sodium benzoate (SB). The samples were stored at room temperature (ca. 20 °C) for 10 days. Incorporating antimicrobials into chitosan-coated Plastic Films slowed down or inhibited the growth of L. monocytogenes. The chitosan-coated Plastic film containing SL was the most effective antimicrobial film and its efficacy against L. monocytogenes on ham steaks was evaluated during 12-week storage at 4 °C. The film showed excellent long-term antilisterial effect with the counts of L. monocytogenes being slightly lower than the initial inoculum. Chitosan-coated Plastic Films containing 0.001 g/cm2 of SL have a potential to be used on ham steaks to control L. monocytogenes. © 2007 Elsevier Ltd. All rights reserved.