Photo-bleached agar extracts from Gracilariopsis heteroclada-Reference-Cited by-同舟云学术

Photo-bleached agar extracts from Gracilariopsis heteroclada

Published:2020-10-26 Issue:6 Volume:63 Page:559-569
ISSN:1437-4323
Container-title:Botanica Marina
language:en
Short-container-title:

Author:

Endoma Leonilo F.¹,Nuñal Sharon N.¹,Traifalgar Rex Ferdinand M.²,Nacional Loda M.¹,Luhan Maria Rovilla J.²

Affiliation:

1. Institute of Fish Processing Technology, College of Fisheries and Ocean Sciences , University of the Philippines Visayas , Miagao , Iloilo 5023 , The Philippines

2. Institute of Aquaculture, College of Fisheries and Ocean Sciences , University of the Philippines Visayas , Miagao , Iloilo 5023 , The Philippines

Abstract

Abstract Agar is a strongly gelling polysaccharide extracted from gracilarioids, which is processed through conventional alkaline pre-treatment and chemical bleaching. However, the use of chemical bleaching agents has associated health risks to humans and the environment. The aim of the present study was to determine the effects of photo-bleaching in combination with NaOH pre-treatments at 5, 10 and 15% concentrations on the physico-chemical properties of agar extracted from Gracilariopsis heteroclada. The results highlighted that the gel strength of photo-bleached agar extracts PBA-15 (1822.00 g cm−2), PBA-10 (1465.60 g cm−2), and PBA-5 (1067.70 g cm−2) were significantly higher than in either a commercially sourced agar reference sample (756.20 g cm−2) or a chemically bleached agar (390.94 g cm−2). The physico-chemical properties of PBA extracts fell within the acceptable limits of food-grade agar. Photo-bleached agar extracts (PBA-5, PBA-10, PBA-15) also exhibited a higher lightness (L*) and whiteness index (WI) which makes these agars ideal for microbiological use. This study demonstrated that photo-bleaching by solar irradiation improved the physico-chemical properties of agar from G. heteroclada without the use of a chemical bleaching agent.

Publisher

Walter de Gruyter GmbH

Subject

Plant Science,Aquatic Science,Ecology, Evolution, Behavior and Systematics

Link

https://www.degruyter.com/document/doi/10.1515/bot-2020-0028/pdf

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