Sorbitol- vs Glycerol-Plasticized Whey Protein Edible Films: Integrated Oxygen Permeability and Tensile Property Evaluation

1994 ◽  
Vol 42 (4) ◽  
pp. 841-845 ◽  
Author(s):  
Tara Habig McHugh ◽  
John M. Krochta
Keyword(s):  
Whey Protein ◽  
Tensile Property ◽  
Oxygen Permeability ◽  
Edible Films ◽  
Property Evaluation

Listeria monocytogenes Inhibition by Whey Protein Films and Coatings Incorporating Lysozyme

2005 ◽  
Vol 68 (11) ◽  
pp. 2317-2325 ◽  
Author(s):  
SEACHEOL MIN ◽  
LINDA J. HARRIS ◽  
JUNG H. HAN ◽  
JOHN M. KROCHTA
Keyword(s):  
Elastic Modulus ◽  
Listeria Monocytogenes ◽  
Whey Protein ◽  
Oxygen Permeability ◽  
Protein Isolate ◽  
Lower Percentage ◽  
Growth Media ◽  
Antimicrobial Effects ◽  
Smoked Salmon ◽  
Yeasts And Molds

The effects of whey protein isolate (WPI) films and coatings incorporating lysozyme (LZ) on the inhibition of Listeria monocytogenes both in and on microbial media, as well as on cold-smoked salmon, were studied. The antimicrobial effects of LZ were examined using various growth media by turbidity and plate counting tests. Disc-covering and disc-surface–spreading tests were also used to evaluate the effects of WPI films incorporating LZ. Smoked salmon was used as a model food to test the antimicrobial effects of WPI coatings incorporating LZ, both initially and during storage at 4 and 10°C for 35 days. Tensile properties (elastic modulus, tensile strength, and percentage of elongation), oxygen permeability, and color (Hunter L, a, and b) of WPI films with and without LZ were also compared. LZ inhibited L. monocytogenes in broth and on agar media. The number of cells surviving after LZ treatments depended on the type of media. WPI films incorporating 204 mg of LZ per g of film (dry basis) inhibited the growth of a preparation of 4.4 log CFU/cm2 L. monocytogenes. WPI coatings prepared with 25 mg of LZ per g of coating solution initially inactivated more than 2.4, 4.5, and 3.0 log CFU/g of L. monocytogenes, total aerobes, and yeasts and molds in smoked salmon samples, respectively. The WPI coatings incorporating LZ efficiently retarded the growth of L. monocytogenes at both 4 and 10°C. The anti–L. monocytogenes effect of LZ-WPI coating was more noticeable when the coating was applied before inoculation than when the coating was applied after inoculation. Significantly higher elastic modulus values and lower percentage of elongation and oxygen permeability values were measured with the WPI films incorporating LZ than with the plain WPI films.

Whey protein edible films modified with almond and walnut oils

2016 ◽  
Vol 52 ◽  
pp. 78-86 ◽  
Author(s):  
Sabina Galus ◽  
Justyna Kadzińska
Keyword(s):  
Whey Protein ◽  
Edible Films

scholarly journals Dispersion and Performance of a Nanoclay/Whey Protein Isolate Coating upon its Upscaling as a Novel Ready-to-Use Formulation for Packaging Converters

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1410 ◽  
Author(s):  
Elodie Bugnicourt ◽  
Nicola Brzoska ◽  
Esra Kucukpinar ◽  
Severine Philippe ◽  
Enrico Forlin ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Solid State ◽  
Whey Protein ◽  
Oxygen Permeability ◽  
Whey Protein Isolate ◽  
Protein Isolate ◽  
Morphological Properties ◽  
Industrial Scale ◽  
Barrier Performance ◽  
Coating Formulations

Studies on composition optimisation showed that the mixing of nanoclays to whey protein-isolate (WPI)-based coating formulations offers an effective strategy to reduce the oxygen permeability of coated polymer films. The scaling up of the various processing stages of these formulations was undertaken to prove their industrial feasibility. The aim was to investigate the effect of various preparation methods at different production scales (pilot- and semi-industrial scale) on the barrier performance and morphological properties of the applied nanocomposites. A nano-enhanced composition was converted into a so-called “ready-to-use” formulation by means of a solid-state pre-dispersion process using ball-milling. The process yielded a nearly dust-free, free-flowing powder containing agglomerated particles, which can easily be mixed with water. The preparation of a coating formulation using the ready-to-use granules and its upscaling for roll-to-roll converting at pilot- and semi-industrial scale was also successfully implemented. The effects of both the production at various scales and ultrasound treatment on the morphology and barrier performance of the nanocomposites were characterized by transmission electron microscopy, scanning electron microscopy, as well as oxygen permeability measurements. Results have shown that the addition of nanoclays to WPI-based coating formulations ultimately led to significantly reduced oxygen permeabilities to 0.59 cm3, 100 µm·m−2·d−1·bar−1 (barrier improvement factor, BIF of 5.4) and 0.62 cm3, 100 µm·m−2·d−1·bar−1 (BIF of 5.1) in cases of pilot- and semi-industrial-processed coatings, respectively, compared to a reference without nanoclay. In both cases, a similar degree of nanoparticle orientation was achieved. It was concluded that the solid state pre-dispersion of the nanoplatelets during the production of the ready-to-use formulation is the predominant process determining the ultimate degree of nanoparticle orientation and dispersion state.

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