| Author | Wang, Xiaohong |
| Call Number | AIT Thesis no.AE-91-21 |
| Subject(s) | Brewing industry
|
| Note | A thesis submitted in partial fulfillment of the requirements
for the Degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The selected of the suitable yeast strain Saccbaromyces
cereyisiae from different sources were investigated in terms of
the growth rate and the fermentation ability. The pullulanase
enzyme that extracted from rice was added to wort for improve the
hydrolyses of the dextrin to fermentable sugar. Two type of
enzyme glucoamylase and a-amylase were a l so used during mashing
process. Decoction mashing process was used. Mashing condition
was tested by using Orthogonal method to find the best combination
of different factors for the most fermentable sugar during
mashing process. Four f actors each with three l eve l s were tested
such as the percentage of rice at 20%, 25% and 30 %, the percent age
of sugar at 0%, 5% and 8%, the usage of a - amylase a t 2, 4 and
8 u/g, the usage of glucoamylase at 100, 150 and 200 u/g.
Dry beer was made by using laboratory scale fermenter, and
the quality was tested.
The yeast that uses 2 hours in the l ag phase time and the
generation time at 7.6 hours a t 10 °c and gave the maximum fermentation
degree of 84.9% was selected for dry beer making. It
was found that the wort ma d e by using rice at 25%, pullulanase at
8 u/g, sugar at 8%, a-amylase at 4 u/g, glucoamylase at 150 u/g
contains high fermentable sugar.
The dry beer from this process was contained the l ow calorie
(290-330 Cal) when compared which the regular beer (about 440
Cal). |
| 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) | Ilangantileke, S.G.;Jindal, Vinod Kumar; |
| Scholarship Donor(s) | Federal Republic of Germany
(DAAD); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1991 |