where kL is the coefficient of the AsA decomposition rate (h1
) and
xL is the residual ratio of L-ascorbic acid, which decreases after t h
[decimal] (that is, 1 xL is the residual ratio of the L-ascorbic acid
content after drying [decimal]). Eq. (7) is integrated under the initial
condition of xL = 0 to t = 0; thus, Eq. (8) is given as follows: