Antioxidant activities and phenolics content of eight species of seaweeds from north Borneo |
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Authors: | Patricia Matanjun Suhaila Mohamed Noordin Mohamed Mustapha Kharidah Muhammad Cheng Hwee Ming |
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Institution: | (1) School of Food Science and Nutrition, Universiti Malaysia Sabah, Locked Bag 2073, 88999, Kota Kinabalu, Sabah, Malaysia;(2) Faculty of Food Science & Technology, Universiti Putra Malaysia, UPM 43400 Serdang, Selangor, Malaysia;(3) Faculty of Veterinary Medicine, Universiti Putra Malaysia, UPM 43400 Serdang, Selangor, Malaysia;(4) Department of Physiology, Faculty of Medicine, Universiti Malaya, 50603 Kuala Lumpur, Malaysia |
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Abstract: | The antioxidant activity of eight edible species of Malaysian North Borneo seaweeds obtained from Sabah waters (Kudat, Tanjung
Aru and Semporna) consisting of three red seaweeds (Eucheuma cottonii, E. spinosum and Halymenia durvillaei), two green seaweeds (Caulerpa lentillifera and C. racemosa) and three brown seaweeds (Dictyota dichotoma, Sargassum polycystum and Padina sp.) were determined. Methanol and diethyl ether were used as extraction solvent. The antioxidant activities were determined
by two methods, TEAC (trolox equivalent antioxidant capacity) and FRAP (ferric reducing antioxidant power) assays. The total
phenolic content of the extract was determined according to the Folin–Ciocalteu method and results were expressed as phloroglucinol
equivalents. The methanolic extracts of green seaweeds, C. lentillifera and C. racemosa, and the brown seaweed, S. polycystum showed better radical-scavenging and reducing power ability, and higher phenolic content than the other seaweeds. The TEAC
and FRAP assays showed positive and significantly high correlation (R
2 = 0.89). There was a strong correlation (R
2 = 0.96) between the reducing power and the total phenolic content of the seaweeds methanolic dry extracts. These seaweeds
could be potential rich sources of natural antioxidants. |
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Keywords: | Seaweeds Antioxidant activity TEAC FRAP Phenolics North Borneo waters |
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