UV Radiation Induced Cross-Linking of Whey Protein Isolate-Based Films

Table 2

Mechanical properties of UV-treated WPI-based films as a function of UV dose and radiation time; significant differences are indicated by different letters .

UV-C dose; (per side) [J/cm^2]	Radiation time; (per side) [min]	Young’s modulus	Tensile strength	Elongation at break [%]
0.0	0	69.8 ± 52.4	4.52 ± 0.75	23.7 ± 20.1
1.2	5	65.1 ± 15.7	4.32 ± 0.25	43.2 ± 19.7
2.8	10	65.7 ± 31.7	6.38 ± 0.57	42.6 ± 30.6
11.6	50	114.5 ± 44.3	7.39 ± 0.67	25.5 ± 7.0
19.9	100	112.8 ± 22.5	7.58 ± 0.51	30.7 ± 12.1
42.0	200	227.7 ± 149.5	13.61 ± 3.64	14.1 ± 9.1

Layer thicknesses in μm according to the increasing radiation time: 47.0 ± 8.2, 49.2 ± 9.3, 48.4 ± 8.0, 38.0 ± 5.7, 49.3 ± 9.9, and 37.5 ± 7.9.