The effect of extrusion processing on the physiochemical properties of extruded orange pomace.
Soluble dietary fibre (SDF) is considered the most effective fraction of dietary fibre (DF) for human health. In this study, extrusion technology was applied to enhance the SDF obtained from orange pomace, a byproduct of juice extraction containing a high level of DF. The pomace was processed in a single-screw extruder at various barrel temperatures (X1; 115-135 °C), feed moistures (X2; 10-18 g/100g), and screw speeds (X3; 230-350 rpm). Based on response surface methodology, the optimum extrusion conditions, which produced a maximum SDF value of 30.36%, were as follows: barrel temperature, 129 °C; feed moisture, 15%; and screw speed, 299 rpm. Compared with unextruded pomace, SDF fraction in extrudate had a higher level of uronic acid. Furthermore, the extrusion process improved the physicochemical properties of extrudate, increasing the water-holding capacity, swelling, water solubility index, and cation-exchange capacity and decreasing the oil-holding capacity.
['Huang|Ya-Ling|YL|', 'Ma|Ya-Sheng|YS|']
D032084:Citrus sinensis D004043:Dietary Fiber D005504:Food Analysis D005511:Food Handling D006801:Humans D008962:Models, Theoretical D009005:Monosaccharides D012995:Solubility D013696:Temperature D014867:Water
Extrusion Orange pomace Soluble dietary fibre Response surface methodology Physicochemical property