HYDRATION PROPERTIES OF DIETARY FIBER POWDER FROM CABBAGE BY-PRODUCTS

The use of by-products from fruit and vegetable processing plants as sources of dietary fiber and bioactive agents is currently of interest. This work was aimed at studying effect of the drying (60°-80°C) on the hydration properties of cabbage powder, i.e. water holding capacity (WHC) and swelling capacity (SWC). The moisture contents of high dietary fiber powder from cabbage were in the range of 6-8% (wet basis) or 6.4-8.7% (dry basis) which lowered than the desired moisture content (less than 9% (wet basis)) recommended for the commercial dietary fiber powder. Drying temperature did not have a significant effect on the total dietary fiber contents of cabbage outer leaves (40.50-43.15 %). Insoluble dietary fiber (IDF) contents were much higher than the soluble dietary fiber (SDF) contents leading to the SDF:IDF ratios of 1:7.5 to 1:7.8. The effect of particle size of fiber powder in the range of 63-450 μm, on the hydration properties was also evaluated. Decreasing the particle size of cabbage outer leaves resulted in decreasing of WHC and SWC. Comparing at similar particle size, WHC and SWC of outer leaves of cabbage fiber powder were not significantly different among 60°-80°C drying temperatures.