The development of nutraceutical ingredients is of current interest for the food industry. A fibre-rich powder (FRP) was prepared by
liquefaction of raw banana flour (RBF) and its chemical composition, water- and oil-holding capacity, and antioxidant capacity were
evaluated. Total dietary fibre (TDF) was higher in FRP than in the RBF, but the total starch (TS), potentially available starch (AS)
and resistant starch (RS) contents were lower in the processed product, since the liquefaction process involves granular disruption
and starch hydrolysis, resulting in reduced TS and AS and increased TDF. The reduced RS content is also explained by the loss of granular
integrity, which is the main factor responsible for the indigestibility of native banana starch. Total indigestible fraction content of
FRP was relatively high, the soluble fraction being lower than the insoluble portion. A very fast reduction of DPPH was observed in the
presence of FRP, indicating that polyphenols in this preparation efficiently quench free radicals. Tested at various temperatures, the FRP
and RBF exhibited similar water-and oil-holding capacities. The main difference was observed in water-holding capacity at 80 C, where
FRP was less efficient than the raw material, a fact associated with starch gelatinization in RBF treated at that temperature. FRP might
be a potential ingredient for development of products with high TDF and indigestible fraction contents, as well as important antioxidant
capacity.
The development of nutraceutical ingredients is of current interest for the food industry. A fibre-rich powder (FRP) was prepared byliquefaction of raw banana flour (RBF) and its chemical composition, water- and oil-holding capacity, and antioxidant capacity wereevaluated. Total dietary fibre (TDF) was higher in FRP than in the RBF, but the total starch (TS), potentially available starch (AS)and resistant starch (RS) contents were lower in the processed product, since the liquefaction process involves granular disruptionand starch hydrolysis, resulting in reduced TS and AS and increased TDF. The reduced RS content is also explained by the loss of granularintegrity, which is the main factor responsible for the indigestibility of native banana starch. Total indigestible fraction content ofFRP was relatively high, the soluble fraction being lower than the insoluble portion. A very fast reduction of DPPH was observed in thepresence of FRP, indicating that polyphenols in this preparation efficiently quench free radicals. Tested at various temperatures, the FRPand RBF exhibited similar water-and oil-holding capacities. The main difference was observed in water-holding capacity at 80 C, whereFRP was less efficient than the raw material, a fact associated with starch gelatinization in RBF treated at that temperature. FRP mightbe a potential ingredient for development of products with high TDF and indigestible fraction contents, as well as important antioxidantcapacity.
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