Effect of different drying techniques on the phytochemical content and antioxidant activity of kappaphycus alvarezii

Abu Bakar, Mohd Fadzelly and Lee, Angelina Mei Ling and Yasir, Suhaimi and Matanjun, Patricia (2015) Effect of different drying techniques on the phytochemical content and antioxidant activity of kappaphycus alvarezii. Journal Of Applied Phycology, 27 (4). pp. 1717-1723. ISSN 9218971

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Abstract

The effect of different drying techniques on the phytochemical content and antioxidant activity of Kappaphycus alvarezii (‘crocodile’ morphotype) were inves-tigated. Phytochemical (total phenolic, flavonoid, anthocyanin and carotenoid content) and antioxidant activity of the sea-weed were determined. The seaweed was dried using seven types of drying techniques; oven drying (temperature of 40 °C), oven drying (temperature of 80 °C), sun drying, hang drying, sauna drying, shade drying and freeze drying. There were significant differences in the phytochemical content and antioxidant activity between the dried seaweed samples. The total phenolic content of the dried samples were in the range of 26.11 to 53.33 mg gallic acid equivalent (GAE) per 100 g, total flavonoid content from 9.83 to 25.67 mg catechin equiv-alent (CE) per 100 g, total anthocyanin content from 0.05 to 0.11 mg cyanidin-3-glucoside equivalent (C-3-GE) per gramme and total carotenoid content from 0.03 to 0.24 mg β-carotene equivalent (BCE) per gram, respectively. The oven-dried (40 and 80 °C) and shade-dried samples contained the highest values of phytochemical content as compared to other dried samples tested. Antioxidant activity were deter-mined using 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2- azino-bis-(3-ethyl-benzothiazoline-6-sulphonic acid) (ABTS) and ferric reducing/antioxidant power (FRAP) assays. The oven-dried (40 and 80 °C) and shade-dried samples also displayed stronger scavenging activity and reducing ability as compared to other dried samples tested. The lower values of phytochemical content and weak antioxidant activity were detected in sun-dried and sauna-dried samples. This finding suggested that different drying techniques greatly influence the occurrence of phytochemical content and antioxidant ac-tivity in seaweeds.

Item Type:	Article
Uncontrolled Keywords:	Oven drying; Sun drying; Hang drying; Sauna drying; Shade drying; Freeze drying; Kappaphycus alvarezii ;Phytochemical content; Antioxidant activity
Subjects:	Q Science > QK Botany T Technology > T Technology (General)
Divisions:	Faculty of Applied Science and Technology > Department of Technology and Natural Resources
Depositing User:	Mrs. Mashairani Ismail
Date Deposited:	21 Dec 2021 04:13
Last Modified:	21 Dec 2021 04:13
URI:	http://eprints.uthm.edu.my/id/eprint/4827

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