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Characteristics of films

 
Item CRY1 WEE2
Thickness 25 μm 45 μm
Density 0.97 g/cm2 43.33 g/m2
O2 permeability (at 23°C and 0% R.H. per day) 15 cm3/m2 6 cm3/m2/24 h
CO2 permeability (at 23°C and 0% R.H.3 per day) 64 cm3/m2 20 cm3/m2
Moisture vapor transmission rate (at 38°C and 90% R.H. per day) 16 g/m2 11 g/m2
1CRY = Cryovac LID 2050, Passirana di Rho, Milano, Italy.
2WEE = Weegal PEBAR film, Vignola, Modena, Italy.
3R.H. = relative humidity.



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Analyses of variance

 
Variables1 Packaging Time Packaging × time
L* <0.0001 0.2230 0.9487
a* <0.0001 <0.0001 0.0047
b* 0.0007 0.0006 0.3649
Chroma <0.0001 <0.0001 0.0028
Hue 0.5709 0.0005 0.1563
pH <0.0001 0.0004 0.0104
WHC <0.0001 <0.0001 0.3595
Cooking loss 0.0004 <0.0001 <0.0001
Drip loss <0.0001 <0.0001 0.2201
WBSF (cooked meat) 0.3190 0.0343 0.0036
TBARS 0.3184 <0.0001 0.1368
Protein oxidation <0.0001 <0.0001 <0.0001
Hydroperoxides 0.0001 <0.0001 <0.0001
1L* = lightness; a* = redness; b* = yellowness; WHC = water holding capacity; WBSF = Warner Blatzer Shear Force; TBARS = thiobarbituric acid reactive substances.



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Linear regression analysis

 
Parameters CRY1 WEE2 P-value
Hydroperoxides × protein oxidation
    R2 0.9736 0.9409
        P-value P < 0.01 P < 0.01
    Intercept 0.1655 0.0586 NS3
    Angular coefficient 0.4196 0.3902 **
Hydroperoxides × TBARS4
    R2 0.9174 0.9094
        P-value P < 0.01 P < 0.001
    Intercept 0.1171 0.2601 NS
    Angular coefficient 2.6789 2.2368 ***
Protein oxidation × TBARS
    R2 0.9631 0.9225
        P-value P < 0.01 P < 0.01
    Intercept 0.6478 0.5523 NS
    Angular coefficient 6.9357 5.6270 ***
Hydroperoxides × WHC5
    R2 0.8507 0.7581
        P-value P < 0.001 P < 0.001
    Intercept 9.5115 8.1217 NS
    Angular coefficient –0.1036 –0.0846 *
Protein oxidation × WHC
    R2 0.8443 0.7434
        P-value P < 0.001 P < 0.001
    Intercept 22.7180 20.3680 NS
    Angular coefficient –0.2426 –0.2129 NS
TBARS × WHC
    R2 0.7877 0.7145
        P-value P < 0.001 P < 0.001
    Intercept 3.0340 2.9914 NS
    Angular coefficient –0.0332 –0.0317 NS
1CRY = Cryovac LID 2050 (Passirana di Rho, Milano, Italy).
2WEE = Weegal PEBAR film (Vignola, Modena, Italy).
3NS = not significant.
4TBARS = thiobarbituric acid reactive substances.
5WHC = water holding capacity.
*= P < 0.05; ** = P < 0.01; *** = P < 0.001.