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Solar irradiation as an alternative bleaching process for agar extracted from Gracilariopsis heteroclada in Iloilo, Philippines

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Date
2019-07-30
Author
Endoma, Leonilo F.
Nacional, Loda M.
Luhan, Maria Rovilla J.
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167
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Abstract
The current industrial practice of using chemical bleach to achieve the pure white colour of agar is deleterious to both human and environmental health. This study evaluates the potential of solar irradiation as an alternative bleaching process for agar extracted from Gracilariopsis heteroclada in Iloilo, Philippines. The physico-chemical properties of agar obtained from alkaline-treated seaweed after exposure to different bleaching conditions (e.g. solar irradiation, hypochlorite solution, and ultraviolet and fluorescent lights) were examined and compared with commercial bacteriological agar. Photobleaching through solar irradiation produced agar with superior gel strength (1038.61 g cm−2), high 3,6-anhydrogalactose content (41.44%) and low total inorganic sulphate content (1.87%) without compromising agar yield (19.37%). Solar irradiation offers very promising results as a simple, low-cost, environmentally friendly alternative to the chlorine bleaching process for agar extraction.
URI
http://hdl.handle.net/10862/3477
Suggested Citation
Endoma, L. F., Nacional, L. M., & Luhan, M. R. J. (2019). Solar irradiation as an alternative bleaching process for agar extracted from Gracilariopsis heteroclada in Iloilo, Philippines. Botanica Marina, 62(6), 605-613.
DOI
10.1515/bot-2018-0120
Subject
agar ASFA; Agar extraction; Chemical bleaching; Gracilariopsis heteroclada; Low-cost; Environmentally friendly; Photobleaching
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