The sweetpotato flours were extruded in the Prism Eurolab KX 16 twin screw extrude,
using a slit die (15 2mm2) at three levels each of moisture (30, 35,40 g/100 g) and screw speed (150, 220, 300 rpm), maximum barrel temperature of 120 C, and feed rate of 1.5 kg/h. These conditions were obtained from preliminary studies in our laboratories on stable
sweetpotato extrusion as evidenced by no die jetting, continuous run and minimum torque fluctuations.The extruder set-up is detailed in Yong, Chan, Garcia, & Sopade. The extrudates were cooled overnight at room temperaturebefore their expansion characteristics were assessed. They
were then freeze-dried and cryo-milled as before
prior to further analysis. The non-extruded sweetpotato dried chips
were also cryo-milled, and all the cryo-milled samples averaged
160 mm particle size. Due to a limited sample size, cultivars Snow
White and L49 were extruded at only one condition (35 g/100 g
moisture, 300 rpm screw speed). The melt (die) temperature was
measured using a thermocouple attached to the die, and the specific
mechanical energy (SME)was calculated as in Eq because the noload
torque was negligible.
The sweetpotato flours were extruded in the Prism Eurolab KX 16 twin screw extrude,using a slit die (15 2mm2) at three levels each of moisture (30, 35,40 g/100 g) and screw speed (150, 220, 300 rpm), maximum barrel temperature of 120 C, and feed rate of 1.5 kg/h. These conditions were obtained from preliminary studies in our laboratories on stablesweetpotato extrusion as evidenced by no die jetting, continuous run and minimum torque fluctuations.The extruder set-up is detailed in Yong, Chan, Garcia, & Sopade. The extrudates were cooled overnight at room temperaturebefore their expansion characteristics were assessed. Theywere then freeze-dried and cryo-milled as beforeprior to further analysis. The non-extruded sweetpotato dried chipswere also cryo-milled, and all the cryo-milled samples averaged160 mm particle size. Due to a limited sample size, cultivars SnowWhite and L49 were extruded at only one condition (35 g/100 gmoisture, 300 rpm screw speed). The melt (die) temperature wasmeasured using a thermocouple attached to the die, and the specificmechanical energy (SME)was calculated as in Eq because the noloadtorque was negligible.
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