Food Quality and Shelf Life

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Perm Selectivity & Cut Apples Under optimum atmosphere of 30% CO 2 , 0.5% O 2 ; R CO2 = 2.1 Kg/hr, and RQ = 1.9 (Gunez & Hotchkiss, 2001). Assume: Package A= 1320 cm 2 ; x= 1 mil; mass apples = 2.27 Kg; bulk apple volume = 3818 cm 3 ; package volume = 5090 cm 3 ; and headspace = 1272 cm 3 ; optimum CO 2 ; y oCO2 = 0.30; O 2 ; y oO2 = 0.005; external CO 2 and O 2 concentrations; y eCO2 = 0; and y eO2 = 0.21. Calculated (Exama et al, 1993) required permeability for fresh-cut apples is: P R CO2= WR CO2 L/Ap(yoCO 2 -yeCO 2 ) = 1.2 x 10 -2 mL mil/cm 2 hr atm P R O2= WR O2 L/Ap(yeO 2 -yoO 2 ) = 9.23 x 10 -3 mL mil/cm 2 hr atm P R CO2/ P R O2 = 1.3
Permselectivities of Some Common Films Material Perm Coeff. Permselectivity CO 2 O 2 CO 2 /O 2 LDPE 99 27 3.7 PP 58 9 6.2 PVC 0.65 0.19 3.4 Cell. Acetate 348 10 34 PET 53 6.1 8.7 Ionomer __ -- 4.2 Nylon 6 1.6 0.38 4.2 Al-Ati & Hotchkiss, 2001
Page 1 and 2: Food Quality and Shelf Life (Shelf
Page 3 and 4: Food Quality • Degree to which a
Page 5 and 6: What is the Shelf Life of Milk? •
Page 7 and 8: Time to Deteriorate is Relative •
Page 9 and 10: Selected Measurable Food Quality Fa
Page 11 and 12: Modes of Food Deterioration • Bio
Page 13 and 14: Modes of Food Deterioration • Phy
Page 15 and 16: Peroxide Value Peanut Snack Shelf L
Page 17 and 18: Recent Packaging Technologies to Ex
Page 19 and 20: Examples of Emerging Packaging Tech
Page 21: Scanell et al 2000 Nisin Impregnate
Page 24 and 25: Immobilization on PS Beads Polymer
Page 26 and 27: Example: Selective/Adjusting Barrie
Page 28 and 29: Optimizing Film Permeation for Cut
Page 32 and 33: Recommended Gas Composition for Fru
Page 34: ANTIBODY GRID LASER DIFFRACTION PAT

Food Quality and Shelf Life

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