Effect Of Counter-Rotating Twin Screw Extruder On The Physicochemical And Functional Properties Of Sago (Metroxylon Sagu) Starch
This research project was conducted to study the extent of destruction of sago starch (Metroxylon sagu) by using counter-rotating twin-screw extruder. The effect of primary extrusion parameters, screw speed (100, 125, 150, 175 and 200 rpm) and moisture content (30, 40, 50 and 60% w/w dry basis) w...
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2007
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my-usm-ep.554642022-11-01T01:36:27Z Effect Of Counter-Rotating Twin Screw Extruder On The Physicochemical And Functional Properties Of Sago (Metroxylon Sagu) Starch 2007-03 Bujang, Aisah T1-995 Technology(General) This research project was conducted to study the extent of destruction of sago starch (Metroxylon sagu) by using counter-rotating twin-screw extruder. The effect of primary extrusion parameters, screw speed (100, 125, 150, 175 and 200 rpm) and moisture content (30, 40, 50 and 60% w/w dry basis) was evaluated with barrel temperature kept constant. The changes in both physicochemical and functional properties induced by extrusion processing were studied. High shear forces of the counterrotating twin screw have been suggested in this study to caused not only granular destruction but also destructions at the molecular level. Initial granular structural destruction was observed on the physical structures of the extrudates obtained. Maximum expansion ratio of 7.83 was obtained at 125 rpm screw speed and 30% w/w db moisture content, with lowest bulk density of 0.128 g/cm3 and minimum breaking strength of 0.548 Nm2• Cross section of the extrudate by SEM micrographs also showed highly porous structures with polyhedral gas cells formed. Swelling capability, shape of the gas cells and smoothness of the inner gas cells surface points out that starch granules breakdown have occurred. 2007-03 Thesis http://eprints.usm.my/55464/ http://eprints.usm.my/55464/1/00001664705.pdf application/pdf en public phd doctoral Perpustakaan Hamzah Sendut Pusat Pengajian Teknologi Industri |
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Universiti Sains Malaysia |
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USM Institutional Repository |
| language |
English |
| topic |
T1-995 Technology(General) |
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T1-995 Technology(General) Bujang, Aisah Effect Of Counter-Rotating Twin Screw Extruder On The Physicochemical And Functional Properties Of Sago (Metroxylon Sagu) Starch |
| description |
This research project was conducted to study the extent of destruction of sago starch
(Metroxylon sagu) by using counter-rotating twin-screw extruder. The effect of primary
extrusion parameters, screw speed (100, 125, 150, 175 and 200 rpm) and moisture
content (30, 40, 50 and 60% w/w dry basis) was evaluated with barrel temperature
kept constant. The changes in both physicochemical and functional properties
induced by extrusion processing were studied. High shear forces of the counterrotating
twin screw have been suggested in this study to caused not only granular destruction but also destructions at the molecular level. Initial granular structural
destruction was observed on the physical structures of the extrudates obtained.
Maximum expansion ratio of 7.83 was obtained at 125 rpm screw speed and 30% w/w
db moisture content, with lowest bulk density of 0.128 g/cm3 and minimum breaking
strength of 0.548 Nm2• Cross section of the extrudate by SEM micrographs also showed highly porous structures with polyhedral gas cells formed. Swelling capability,
shape of the gas cells and smoothness of the inner gas cells surface points out that
starch granules breakdown have occurred. |
| format |
Thesis |
| qualification_name |
Doctor of Philosophy (PhD.) |
| qualification_level |
Doctorate |
| author |
Bujang, Aisah |
| author_facet |
Bujang, Aisah |
| author_sort |
Bujang, Aisah |
| title |
Effect Of Counter-Rotating Twin Screw Extruder
On The Physicochemical And Functional Properties
Of Sago (Metroxylon Sagu) Starch |
| title_short |
Effect Of Counter-Rotating Twin Screw Extruder
On The Physicochemical And Functional Properties
Of Sago (Metroxylon Sagu) Starch |
| title_full |
Effect Of Counter-Rotating Twin Screw Extruder
On The Physicochemical And Functional Properties
Of Sago (Metroxylon Sagu) Starch |
| title_fullStr |
Effect Of Counter-Rotating Twin Screw Extruder
On The Physicochemical And Functional Properties
Of Sago (Metroxylon Sagu) Starch |
| title_full_unstemmed |
Effect Of Counter-Rotating Twin Screw Extruder
On The Physicochemical And Functional Properties
Of Sago (Metroxylon Sagu) Starch |
| title_sort |
effect of counter-rotating twin screw extruder
on the physicochemical and functional properties
of sago (metroxylon sagu) starch |
| granting_institution |
Perpustakaan Hamzah Sendut |
| granting_department |
Pusat Pengajian Teknologi Industri |
| publishDate |
2007 |
| url |
http://eprints.usm.my/55464/1/00001664705.pdf |
| _version_ |
1776101087530450944 |