2.8.3. Stability of RSA and FRAP

Several studies have reported the use of simple first-order reaction kinetics to describe storage and thermal degradation of bioactive compounds from various sources. Li et al. [33] and Moldovan et al. [34] described the degradation kinetics as in Equation (4):

$$
\ln[\text{RSA}] = \ln[\text{RSA}\_0] - kt \tag{4}
$$

where RSA = antioxidant capacity, mM TE/g dried aril at time t; RSA0 = initial RSA, mM TE/g; *k* = reaction rate constant, weeks<sup>−</sup>1; t = reaction time, weeks. The half-life of antioxidant capacity from the investigated extracts during storage can be calculated using Equation (4):

$$\mathbf{t}\_{1/2} = -\ln 0.5/k \tag{5}$$

where t1/<sup>2</sup> = half-life (weeks) and *k* = reaction rate constant (weeks<sup>−</sup>1).
