| Author | Berne, Christian Jean-Yves |
| Call Number | AIT Thesis no.AE-91-25 |
| Subject(s) | Fruit--Drying
|
| Note | A thesis submitted in partial fulfillment of the requirements
for the degree of Master of science |
| Publisher | Asian Institute of Technology |
| Abstract | Osmotic dehydration of jackfruit was studied. Different
osmotic solutions at different temperatures as well as
different concentrations were tested. Several parameters were
investigated such as the effect of salt, blanching, agitation
and size on the water loss and sugar gain. Volume changes
during the process was also investigated. The change in color
during osmotic dehydration was studied as well as the
texture.
A low relative humidity (RH) drier was designed and
evaluated. It was compared with vacuum drier and heated air
drier on the water loss and volume change s of jackfruit. The
energy consumption was also determined and compared between
the three kind of driers.
The results obtained from this study showed that sucrose
gave the highest reduction in moisture (>50%) and was found
to have acceptable quality while glucose gave the lowest
reduction in moisture. A mixture of sucrose and glucose 1/1
yielded an acceptable behavior in both water loss and sugar
gain. Concentration was found to be a major parameter
influencing the water loss and 70% was selected as the more
effective concentration. Salt was found to have a positive
effect on osmotic dehydration by increasing the solute gain
and decreasing the shrinkage. Blanching increased the water
loss and sugar gain.
The dehumidifier (low R. H.) was found to be highly
satisfactory for drying both osmosed and non-osmosed samples
at a relative humidity of 27%, compared to vacuum drying and
heated air drying at 45 C. The time to get 20% moisture
content was 30 minutes with the dehumidifier while it was 120
minutes with the heated air drier and vacuum drier. The final
quality of the product was more than satisfactory compared to
the vacuum and air heated drying. |
| Year | 1991 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Athapol Noomhorm; |
| Examination Committee(s) | Jindal, Vinod Kumar;Ilangantileke, S.G.; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1991 |