| الوصف: |
The aim of the present research was to study the composition and physicochemical properties of several fiber-rich fraction prepared from the Liucheng sweet orange peel (LSO peel) and passionfruit seed (PF seed) via different preparation methods by using distilled water, alcohol, and enzymatic hydrolysis. The physicochemical properties of fiber types including water-holding capacity, oil-holding capacity, swelling property, cation-exchange capacity, and glucose adsorption capacity were determined. These results demonstrated that LSO peel and PF seed were rich in insoluble fiber. LSO peel fibers were predominantly composed of uronic acid, reaveling the presence of high amount of pectin substances ; whereas PF seed had a high level of cellulosic glucose and relatively a samll amount of uronic acid. In view of the physicochemical properties, LSO peel insoluble fibers showed significantly higher water-holding capacities, oil-holding capacities, swelling properties, and cation-exchange capacities than those of cellulose. On the other hand, the bulk density and cation-exchange capacities of PF seed insoluble fibers were significantly higher than those of cellulose. The fibers derived from both pomace markedly postponed the adsorption of glucose as compared with that of cellulose. By an animal model, the effect of fibers from different sources on cholesterol absorption, fecal bile acid excretion, and intestinal enzymes in hamster fed a high cholesterol diet were investigated. The hamsters were randomly allotted to the four diet groups, namely fiber-free diet, LSO peel WIS diet, PF seed WIS diet, cellulose diet, with 8 animals each. The animals were fed for 30 days. Results showed that PF seed group, followed by LSO peel group significantly decreased the level of serum triglyceride and total cholesterol. The HDL-cholesterol serum cholesterol of fiber-free group was significantly lower than those of the other three fiber-enriched groups. Compared with the cellulose, LSO peel group had significantly lower level of liver ... |