Abstract
The effects of acidic treatment, cellulase hydrolysis, particle size distribution and pH on the adsorption capacity of defatted coconut cake dietary fibers (DCCDF) were studied. The results demonstrated that cellulase hydrolysis could significantly improve the soluble dietary fiber content, water holding ability and adsorption ability of DCCDF on cholesterol, bile and nitrite ions. Acidic treatment enhanced the oil holding capacity and adsorption ability in cholesterol and nitrite ions. Moreover, the adsorption ability of DFs in cholesterol, nitrite and bile all increased with reduced particle size (250 to 167 μm), and DCCDF demonstrated a higher adsorption capacity at pH 2.0 than at pH 7.0. The change in adsorption capacity of DCCDF might be suitable for application in the food industry as a low-calorie and cholesterol lowering functional ingredient.
Highlights
Dietary bers (DF) derived from cereal, fruit and vegetable by-products have received more and more attention for their low cost and bene cial effects on human health, including reduced risk of coronary heart disease, diabetes and some forms of cancer.[1]
Compared to Defatted coconut cake (DCC), the TDF content of the three DFs was higher while the fat and protein content was lower, which was in accordance with the report of Yalegama et al.[10]
defatted coconut cake dietary fibers (DCCDF)-A produced by acidic treatment, exhibited a lower SDF content (2.16 Æ 0.51 g/100 g) than that of DCCDF (P < 0.05), indicating that the acidic treatment led to reduction in SDF
Summary
Dietary bers (DF) derived from cereal, fruit and vegetable by-products have received more and more attention for their low cost and bene cial effects on human health, including reduced risk of coronary heart disease, diabetes and some forms of cancer.[1] In food and non-food industries, the usage of DFs is dependent on their physicochemical and functional properties, which can be modi ed by extraction methods, processing conditions and particle size.[2] Adsorption activity is one of the most important functional properties of DFs. It was evident that DFs with high binding ability could effectively accelerate the excretion of bile acids, in turn reducing the adsorption of bile in gastrointestinal digestion and preventing epithelial cell and DNA damage.[3] Some DFs with high adsorption activity of oil could reduce plasma cholesterol levels as well as the incidence of atherosclerosis.[4] Some DFs have even demonstrated high adsorption ability of hazardous substances such as heavy metals, nitrite and others.[1] previous study found that adsorption activity of DFs was correlated with monosaccharide composition, soluble dietary ber (SDF) content, water holding capacity (WHC), water swelling capacity (WSC) and oil holding capacity (OHC), and contributed to the glucose dialysis retention index (GDRI) and emulsifying property of DFs.[5]
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