Nishyanthi, Puspakaran (2014) Thermodynamic study on polyphenol thermal degradation from orthosiphon stamineus. Faculty of Chemical & Natural Resources Engineering, Universiti Malaysia Pahang.
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Abstract
Orthosiphon stamineus is an herbal medicine plant that is commonly used in daily life to treat diseases. It has many medical properties that are contributed by polyphenol component. However, the properties will decline by thermal degradation once the heat treatment is applied to preserve the plant. Previous studies have been done more on identifying the component and properties of 0. stamineus rather than studies on thermal degradation. Therefore, this study is aim to identify and investigate the effect of temperature on the thermal degradation of polyphenol from Orthosiphon stamineus leaves. Dry powdered leaves of 0. stamineus will be extracted by solvent extraction using ethanol to produce crude extract and then the heat treatment is carried out between temperatures from 70°C to 120°C at varies time interval. The UPLC analysis and total flavonoid content (TFC) are conducted before and after the heat treatment to analyse the thermal kinetic changes and these changes will be explained using best kinetic model that fits the data. The polyphenol thermal degradation can be identified for the used temperature range and the kinetic modelling can be developed from the kinetic changes; From the result, it can be proved that active components degraded when temperature and residence time increased during heat treatment and sinensetin showed larger degradation compared to rosmarinic acid where it showed less degradation. The data obtained from the experiment fitted well by both Hinrichs-Rademacher and Arrhenius equation using Microsoft Excel Solver and degradation rate constant increases when heating temperature increased and activation energy decreased. Therefore, it can be conclude that, higher temperature and residence time will increase the thermal degradation of bioactive component in Orthosiphon stamineus and the both Hinrichs-Rademacher and Arrhenius equation fitted the data. Result from this work may be useful to preserve the polyphenol content in Orthosiphon stamineus during processing involving thermal exposure that can retain the quality of the final product.
| Item Type: | Undergraduates Project Papers |
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| Additional Information: | Faculty of Chemical & Natural Resources Engineering Project paper (Bachelor of Chemical Engineering) - Universiti Malaysia Pahang – 2014 |
| Uncontrolled Keywords: | Thermodynamics |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Faculty/Division: | Faculty of Chemical & Natural Resources Engineering |
| Depositing User: | Mr. Mohd Adzha Mat Sam |
| Date Deposited: | 10 Sep 2015 03:25 |
| Last Modified: | 26 Jul 2021 08:06 |
| URI: | http://umpir.ump.edu.my/id/eprint/10193 |
| Download Statistic: | View Download Statistics |
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