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Title: Effects of Wet Milling Sago Pith Waste on Yield and Physical Properties of Sago Starch
Author(s): Budi Santoso, Kotatsu Sakakura, Hitoshi Naito, Masaharu Ohmi, Yoshihiko Nishimura, Tomohiro Uchiyama, Akemi Itaya, Makoto Hisamatsu, Hiroshi Ehara, Takashi Mishima
Pages: 1-6 Paper ID:170802-9393-IJET-IJENS Published:April, 2017
Abstract: The objective of this study was to investigate sago starch recovery from sago pith waste using wet milling, and to examine the sago starch physical properties. The results show that recovery of sago pith waste by wet milling increased the amount of starch by 21% (dry basis). Scanning electron microscopy showed that wet milling did not change the smoothness of the granule surface, and birefringence was clearly seen when the sample was observed using polarized light microscopy. The volume-median diameter of wet-milled sago starch was slightly higher than that of untreated sago starch; however, the particle size distribution index (span) was the same. X-ray diffraction showed that the crystallinity of wet-milled sago starch was similar to that of untreated sago starch. Differential scanning calorimetry showed that the peak temperatures and gelatinization enthalpies of untreated sago starch and sago starch milled using a super mass colloider were the same. These results show that wet milling is better than dry milling of sago starch, and does not much change its physical properties.
Keywords: Wet milling, sago pith waste, sago starch, physical properties.
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