Effect of temperature and time to the antioxidant activity in Plecranthus amboinicus Lour

Abdul Rahim, Mohd S. Azman and Salihon, Jailani and Mohd Yusoff, Mashitah and Abu Bakar, Ibrahim and Damanik, Mohd Rizal Martua (2010) Effect of temperature and time to the antioxidant activity in Plecranthus amboinicus Lour. American Journal of Applied Sciences , 7 (9). pp. 1195-1199. ISSN 1554-3641(O), 1546-9239 (P)

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Abstract

Problem statement: Processing of food involving heat will contribute to loss of nutritional content, thus it is important to measure and control temperature and time to reduce the loss. Approach: Examine the effects of variations in boiling temperature and boiling time on the antioxidant activity of the boiling extract of Plecranthus amboinicus Lour. Fresh plants were boiled at 45, 60, 100 and 120[degrees]C for 1, 2 and 3 h respectively. The decoction was then filtered and the antioxidant activities of the extracted samples were measured on the basis of the scavenging activity of the stable 1,1-Diphenyl-2-Picrylhydrazyl (DPPH) free radical scavenging assay. Results: The antioxidant activity increased with the rise of temperature from 45-100[degrees]C but dropped when the extraction temperature was raised to 120[degrees]C. Two hours boiling time gave the highest antioxidant activities, but with no significant difference compared to 1 h boiling time (p>0.05). However, 3 h of boiling gave significantly (p<0.05) less antioxidant activity in the extract. Conclusion: Knowing the best boiling temperature and time will guide the future research in preserving antioxidant content of the plant when processing by boiling.

Item Type:	Article (Journal)
Additional Information:	5138/11377
Uncontrolled Keywords:	Antioxidant activity, antibacterial activity, carotenoid, Plecranthus amboinicus Lour
Subjects:	Q Science > Q Science (General) Q Science > QD Chemistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Allied Health Sciences Kulliyyah of Allied Health Sciences > Department of Nutrition Sciences
Depositing User:	Dr Ibrahim Abu Bakar
Date Deposited:	19 Apr 2012 09:34
Last Modified:	19 Apr 2012 09:35
URI:	http://irep.iium.edu.my/id/eprint/11377

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