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The effects of drying temperature on total phenolic content (TPC) and Antioxidant Activities of Misai Kucing (Orthosiphon stamineus Benth) Plants

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Bibliographic Details
Main Author: Siti Noor, Yusof
Other Authors: Prof. Dr. Abdul Razak Shaari (Advisor)
Format: Learning Object
Language:English
Published: Universiti Malaysia Perlis 2011
Subjects:
Antioxidant
Misai Kucing
Orthosiphon stamineus benth
Herbal plants
Online Access:http://dspace.unimap.edu.my/xmlui/handle/123456789/13145
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spelling my.unimap-131452011-07-11T03:45:16Z The effects of drying temperature on total phenolic content (TPC) and Antioxidant Activities of Misai Kucing (Orthosiphon stamineus Benth) Plants Siti Noor, Yusof Prof. Dr. Abdul Razak Shaari (Advisor) Antioxidant Misai Kucing Orthosiphon stamineus benth Herbal plants Access is limited to UniMAP community. The modified spectrophotometric method makes use of the 2,2- diphenyl-1- picrylhydrazyl (DPPH) radical and its specific absorbance properties. The absorbance decreases when the radical is reduced by antioxidants. In contrast to other investigations, the absorbance was measured at a wavelength of 517 nm which disappears upon reduction by an antiradical compound. In addition, a synthetic antioxidant slowly reacts with DPPH∙ reaching a steady state. The use of methanol as extract ant restricts the cellular compounds responsible for scavenging the DPPH radical. Phenolic compounds are known as oxidizing agent that contributes in the reduction process. On the other hand, it accepts an electron during the reaction. However, it is different with the free radical which is involved in the oxidation process. Hence, it is important to act as a reducing agent that donates an electron. The concentration of gallic acid equivalent is the main parameter in order to determine the total phenolic compounds in the sample extracts. From the data, the amount of phenolics can be estimated due to the antioxidants activities. Design of Experiment (DOE) is used to analyze the result. Overall, drying temperature had no significant effect on the TPC content (mg/L gallic acid equivalent) in the plant parts in terms of the free radical scavenging activity. 2011-07-11T03:45:16Z 2011-07-11T03:45:16Z 2010-06 Learning Object http://hdl.handle.net/123456789/13145 en Universiti Malaysia Perlis School of Bioprocess Engineering
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Antioxidant
Misai Kucing
Orthosiphon stamineus benth
Herbal plants
spellingShingle Antioxidant
Misai Kucing
Orthosiphon stamineus benth
Herbal plants
Siti Noor, Yusof
The effects of drying temperature on total phenolic content (TPC) and Antioxidant Activities of Misai Kucing (Orthosiphon stamineus Benth) Plants
description Access is limited to UniMAP community.
author2 Prof. Dr. Abdul Razak Shaari (Advisor)
author_facet Prof. Dr. Abdul Razak Shaari (Advisor)
Siti Noor, Yusof
format Learning Object
author Siti Noor, Yusof
author_sort Siti Noor, Yusof
title The effects of drying temperature on total phenolic content (TPC) and Antioxidant Activities of Misai Kucing (Orthosiphon stamineus Benth) Plants
title_short The effects of drying temperature on total phenolic content (TPC) and Antioxidant Activities of Misai Kucing (Orthosiphon stamineus Benth) Plants
title_full The effects of drying temperature on total phenolic content (TPC) and Antioxidant Activities of Misai Kucing (Orthosiphon stamineus Benth) Plants
title_fullStr The effects of drying temperature on total phenolic content (TPC) and Antioxidant Activities of Misai Kucing (Orthosiphon stamineus Benth) Plants
title_full_unstemmed The effects of drying temperature on total phenolic content (TPC) and Antioxidant Activities of Misai Kucing (Orthosiphon stamineus Benth) Plants
title_sort effects of drying temperature on total phenolic content (tpc) and antioxidant activities of misai kucing (orthosiphon stamineus benth) plants
publisher Universiti Malaysia Perlis
publishDate 2011
url http://dspace.unimap.edu.my/xmlui/handle/123456789/13145
_version_ 1643790758954663936
score 13.214268

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