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KMID : 0380619750070030115
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Korean Journal of Food Science and Technology
1975 Volume.7 No. 3 p.115 ~ p.119
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Extraction Yield and Quality Attributes of Agar from Imported Seaweeds According to Various Pretreatments
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이서래/Lee, Su Rae
조한옥/정만재/Cho, Han Ok/Chung, Man Jai
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Abstract
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Imported seaweeds Gracilaria sp. and Gelidium sp. from the Philippines and Gracihria sp. from Brazil were subjected to the examination of yield and quality of agar according to various pretreatment conditions.
As pretreatment condition for alkali-treated Gracilaria sp. from the Philippines, 0.05∼0.1% concentration of sulfuric acid was proper to obtain the higher yield of agar for which a reverse proportionality was shown between the acid concentration and the strength of extraction condition. Highest yield from Gelidium sp. from the Philippines was obtained by pretreating with 5% sodium hydroxide at 90℃ for one hour, followed by 0.1% sulfuric acid treatment. Gracilaria sp. from Brazil gave the highest yield of agar by pretreatments with 1% sodium hydroxide followed by 0.05% sulfuric acid, both at room temperature for one hour.
Acid treatment of alkali-treated Gracilaria sp. from the Philippines brought about the decrease of total nitrogen, total sulfur and crude ash, the increase of jelly strength and no marked change in gelation point and gelation ability. In general, acid-treatment conditions to give rise to high yield of agar improved the quality of product.
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