The glucose-adsorption capacity and amylase inhibitory effect (%) of the insoluble FRFs relative to cellulose are shown in Table 5. The glucose-adsorption capacities of the FRFs (9.62–10.4 mmol glucose/g fibre) were significantly (P<0.05) higher than that of cellulose (8.74 mmol glucose/g fibre). The stronger ability of the FRFs to bind glucose might be beneficial to lower the concentration of available glucose in the small intestine. The insoluble FRFs were also found to exhibit a significantly (P<0.05) stronger effect in reducing the amylase activity (21.8–27.9%) than cellulose (7.29%).
This in-vitro study indicated that the FRFs could retard the glucose production rate (mmol/h) more efficiently than cellulose. Findings from Gourgue et al. (1992) and Ou et al. (2001) demonstrated that dietary fibres could retard a-amylase activity by capsulating starch and enzyme, and even inhibiting the enzyme. All these results imply that the apparent effects, on glucose-adsorption and amylase inhibition, of the FRFs might create a concerted function in decreasing the absorption rate of glucose and the concentration of postprandial serum glucose.
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