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Extraction, Characterisation And Application Of Agar From Gracilaria Sp


Wongsuban, Benchamaporn (1999) Extraction, Characterisation And Application Of Agar From Gracilaria Sp. Masters thesis, Universiti Putra Malaysia.

Abstract / Synopsis

The methods for extraction of agar from seaweeds differed either in the type of extraction solution, its concentration, the heating temperature or heating time used. Alkali pre-treatment of the seaweeds has also been performed in order to improve the agar gel strength. Sodium hydroxide has been used and the conditions were varied in terms of sodium hydroxide concentration, soaking temperature and time. In this study, the optimum conditions for extraction of agar from Gracilaria sp. were determined. The characteristics of the extracted agar were then compared with that of conumercial agar and the behaviour of the agar in roselle jelly was also determined. The three species of Gracilaria used in this study were Gracilaria changii, Gracilaria fisheri and Gracilaria tenuistipitata. Agar was extracted from the seaweeds using different extraction solutions. They were distilled water, sulphuric acid, acetic acid and sodium hexametaphosphate. The concentrations of sulphuric acid and acetic acid were in the range of 0.005-0.03% while the concentrations of sodium hexametaphosphate were in the range of 0.0005-0.003 M.

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Additional Metadata

Item Type: Thesis (Masters)
Subject: Gracilaria
Subject: Agar
Subject: Plant Extracts
Call Number: FSMB 1999 1
Chairman Supervisor: Sharifah Kharidah Syed Muhammad, PhD
Divisions: Faculty of Food Science and Technology
Depositing User: Mohd Nezeri Mohamad
Date Deposited: 19 Jul 2011 15:23
Last Modified: 06 Jan 2016 08:47
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