Alemayehu, Kiros Embaye (2007) Investigation on Effects of Roasting Temperature and Roasting Time on Caffeine Content in Coffee Using Optical Method. Masters thesis, Addis Ababa University.
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Abstract
In this work a simultaneous determination of caffeine content was performed in sample of sidamo (Ethiopia) coffee, before and after roasting at either different temperature (140 2100c) and different exposure time (4 10 min) in order to investigate the effect on roasting temperature and roasting time on the content of caffeine content in coffee. A UV/VIS spectrophotometer method was used. A modest losses of caffeine was veried both in the roasting time and roasting temperature. Rate constant for chemical reactions at 2000c were determined. The result shows weight loss increases during roasting. For a pure caffeine molar decadic absorption coefcient and translational dipole moment were (1054m2=mol) and (12:78 � 0:71) cm respectively.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | coffee, caffeine, roasting, uv/vis spectrophotometer, thermal. |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics T Technology > T Technology (General) |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 26 Jun 2018 13:25 |
| Last Modified: | 26 Jun 2018 13:25 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/4617 |
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