Oon, Xin Yan (2010) Antioxidant activities, total phenolic and total flavonoid content of three Sabah tropical seaweeds extracts. Universiti Malaysia Sabah. (Unpublished)
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Abstract
This study was to investigate the antioxidant activities together with total phenolic and total flavonoids content of three tropical seaweeds (Sargassum polycystum, Caulerpa lentillifera and Kappaphycus alvaerezzi) in different solvent extracts (water, ethanol, methanol, acetone, chloroform, diethyl ether and hexane). All determinations were done spectrophotometrically. Antioxidant activities were investigated by DPPH radical. scavenging activities, FRAP and beta-carotene bleaching assays. Among seven extractants, methanol shown the best extraction efficacy in S. polycystum whereas ethanol gave the best result in K. alvarezzi and C. lentlllifera In DPPH radical scavenging actlvlti.es, reducing power and total phenolic content. Diethyl ether worked as the best solvent in beta carotene bleaching assay for three seaweeds species. Methanolic extracts of brown, red and green seaweeds obtained highest total flavonoids content among all solvents. Based on the best solvent extracts, K. alvaerezzi possessed highest radical scavenging activities in DPPH assay and beta carotene bleaching assay, yet S. polycystum showed the greatest reducing power among three seaweeds species. Highest TPC was obtained by methanolic extract of S. polycystum and highest TFC however owned by ethanolic extracts of K. alvaerezzL C lentillifera generally has lowest antioxidant activities among three species with respect to their best solvent. Whereas K. alvaerezzi, can be concluded as species with highest antioxidant activities since it possessed highest activities in most tests among three species.
| Item Type: | Academic Exercise |
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| Keyword: | Seaweed, Antioxidant activities, Total phenolic, Total flavonoid, Sabah tropical seaweeds extract, Sargassum polycystum, Caulerpa lentillfera, Kappaphycus alvaerezzi, Water, Ethanol, Methanol, Acetone, Chloroform, Diethyl ether, Hexane |
| Subjects: | T Technology > TX Home economics > TX1-1110 Home economics > TX341-641 Nutrition. Foods and food supply |
| Department: | SCHOOL > School of Food Science and Nutrition |
| Depositing User: | ADMIN ADMIN |
| Date Deposited: | 25 May 2012 17:36 |
| Last Modified: | 23 Oct 2017 12:02 |
| URI: | https://eprints.ums.edu.my/id/eprint/4149 |
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