Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5431385 | Bioactive Carbohydrates and Dietary Fibre | 2017 | 9 Pages |
The aim of this study was to characterize dietary fibers extracted from defatted press meals of lemon, orange and grapefruit seeds. After an ultrasound-assisted aqueous extraction, the fibers were investigated for proximate composition, soluble/insoluble fiber contents, color, viscosity, degradation temperature and enthalpy, near infrared (NIR) spectra, X-ray diffraction patterns, scanning electron microscopy (SEM) images, and functional (water and oil holding capacity, swelling capacity) properties. The fibers contain 2.0-3.45Â mg/g phytate, 1.36-2.26% ash, 4.95-7.95% soluble fiber, 75.95-82.24% insoluble fiber. NIR spectra showed the presence of cellulose and lignin as main components with corresponding bands. Major peak at 22-23Â Ã X-ray diffraction also indicated presence of cellulose crystals. Crystallinity values of 33-80% were measured. SEM images showed the microfibrillar structures present in the samples. Water and oil holding capacities (4.79-7.76Â g/g and 3.44-4.19Â g/g), and swelling capacities (22.44-24.55Â mL/g) proved that the fibers are functional, and especially good for oil containing foods. The utilization of these new fiber sources would be important in terms of by-product valorisation. The data presented in this study may provoke further studies and/or applications of these new dietary fibers.
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