Investigating carotenoid loss after drying and storage of

Arrhenius model:
=
∞
−
Ea
RT
ek
k : degradation constant rate (day -1 )
k∞ : value of k at T = " (day -1 )
T : temperature (K)
Ea : Activation energy (kJ.mol -1 )
R : Molar gas constant = 8.314 J · K−1 · mol −1
ln K (day-1)
-3.00
-3.50
-4.00
-4.50
-5.00
-5.50
-6.00
-6.50
40ºC
y = -7995.9x + 22.391
R 2 = 0.9905
30ºC
240
y = -8354.4x + 23.57
R 2 = 0.9733
Jar 1 Jar 2 Jar 3
20ºC
Appendix 1
y = -8284.2x + 23.34
10ºC
R 2 = 0.9889
0.0032 0.0032 0.0033 0.0033 0.0034 0.0034 0.0035 0.0035 0.0036
1/T (K)
Figure 2: Arrhenius model for temperature between 10-40ºC on a dry weight
basis (mean of triplicate (jar); error bars refer to standard deviation). Oxygen level
21% (air); aw 0.52-0.65.
abk
T
1
ln = − where b and a are constant of linear equation. b= ln k∞.
Ea
Ea was calculated from the linear equation following the formula: a =
R
In average over the three replicates (jars): Ea = 68.3kJ.mol -1 ; k∞ =1.21.10 10 day -1 .