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Composition of tomatoes and tomato products in antioxidants (WG1) page 74
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Normalized concentrations of β-carotene
1.1
(a)
0.9
0.7
0.5
0.3
1,1
1
0,9
0,8
0,7
0,6
0,5
0 3 6 12 24 36 60
(b)
Storage time at -20°C (month)
0 12 24 36 48 60 72 84 96 108 120
Fig. 14 Stability of retinol, α-tocopherol and β-carotene at –20°C (a) and –80°C (b) in
human plasma. (Adapted from Aebisher et al.1999.)
Storage time at -80°C (month)