Abstract:Dietary fiber was prepared using netted melon （Cucumis melo L.var.reticulatus Naud）peel，and the water holding capacity，oil holding capacity，swelling capacity，angle of repose，cholesterol adsorption capacity，cation exchange capacity and amylase activity inhibition ratio of dietary fiber of different particle size（40 mesh-120 mesh）was studied.The structure of dietary fiber was analyzed through scanning electron microscope （SEM）and Fourier transform infrared spectroscopy （FTIR）.The results showed that the dietary fiber of 80 mesh exhibited the highest water holding capacity，oil holding capacity，swelling capacity and cholesterol adsorption capacity，which was 8.56 g/g，2.77 g/g，9.93 mL/g and 18.64 mg/g，respectively.The dietary fiber of smaller average particle size exhibited higher lightness.The angle of repose of dietary fiber ranged from 37.22°-44.76°，and dietary fiber less than 80 mesh exhibited better flowability.The cation exchange capacity and amylase activity inhibition ratio of dietary fiber increased with the decrease of particle size，maximum value of which was 0.53 mmol/L and 19.96%，respectively.The results of SEM showed that the dietary fiber of 80 mesh exhibited more holes and cracks and higher superficial area，which was beneficial to its water holding capacity and adsorption capacity.FTIR analysis suggested that dietary fiber from netted melon presented the typical structure of polysaccharide compound.