| Author | Nguyen Duy Duc |
| Call Number | AIT Thesis no. AE-94-19 |
| Subject(s) | Sweet potato products--Vietnam
|
| Note | A thesis submitted in partial fulfillment of
the requirement for the Degree of Master Engineering, School of Environment, Resources & Development |
| Publisher | Asian Institute of Technology |
| Abstract | Two winter season sweet potato varieties "Hoang long" and "Tu nhien", were
selected for starch extraction. The composition of each variety such as starch content, dry
matter, total sugar, total fibre and total ash content at two periods of 10 and 50 days ·after
harvest were determined. The whiteness of starch extracted from peeled and unpeeled
sweet potato were 81.4 and 79.6, respectively and was not significantly different.
Three starch extraction systems 1, 2 and 3 were tested using the "Hoang long" and
"Tu nhien" sweet potato varieties. The effects of sweet potato variety and extraction system
on processing parameters such as dry matter, conversion rate, extraction efficiency, specific
power consumption, sweet potato residue, starch color etc., were studied.
A 27 to 29 minutes filtering time and 120 to 125 liters of water use were found to
be optimal for the filtering machine using starch extraction system 2. A rpm of 1600 to
1700 and water use of 2.6 liters per kg of ground fresh root, were found to be optimal
working conditions for the combined grating and filtering machine in system 3.
The Financial Rates of Return (FRR) was found to be 31.43, 31.45 and 32.72% for
system 1, system 2 and system 3, respectively, and were higher than the minimum
acceptance FRR of 26%. The sensitivity of different processing parameters to the FRR for
each system were also determined.
The use of different sweet potato starch extraction systems in different ecological
zones of Vietnam are also presented. |
| Year | 1994 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Ilangantileke, S.G.
|
| Examination Committee(s) | Wheatley, C. ;Athapol Noomhorm ;Jindal, Vinod Kumar ;Vincent, Jean-Claude
|
| Scholarship Donor(s) | Republic of Korea |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1994 |