An in vitro starch digestibility procedure was conducted in this
study to simulate the in vivo situation of starch digestion characteristics
and to estimate the metabolic glycemic response to the
samples. The starch hydrolysis curves (Fig. 2) and the first-order
kinetic model of starch hydrolysis (Fig. 3) for GBF and ADGBF are
shown. The results of the in vitro starch digestion are summarized
in Table 2, including the equilibrium constant C∞ and kinetic constant
k in the first-order kinetic model of the starch hydrolysis, the
hydrolysis index HI and the estimated glycemic index eGI.
The profile of in vitro starch hydrolysis (Fig. 2) exhibited a
gradual increment in all tested samples as time increased until a
maximum plateau was slowly reached. Each sample characterized
by the course of starch hydrolysis has its own k and C∞ values, as
shown in Fig. 2 and Table 2. White bread, used as a reference food,
underwent a higher starch hydrolysis during 30e180 min, when
compared with the other samples. A 54.07% (C∞) of digestion