Search for new sources of carrageenan from Philippine seaweeds and the development of applications for unmodified carrageenan
1999
Montano, N.E. | Faustino, J. | De Leon, J.F. | Badion, E. (Philippines Univ. Diliman, Diliman, Quezon City (Philippines). Marine Science Inst.)
This study was performed mainly to determine alternative sources of carrageenan. Out of the seaweeds that were collected and examined, three seaweeds namely: Hypnea sp., Bostrychia sp., and Eucheuma gelatinae were identified on the basis of yield, and conformity with the regulations as stated in the Food Chemicals Codex 3rd edition. The report presents percentage yield, and infrared spectroscopy results. On the other seaweeds, data pertaining to the sulfate content were also presented and for those extracted polysaccharides that were able to form a gel, the melting point and gelling point of the gel in the presence of various ions were determined to establish the polysaccharides ionic reactivity. Although Gelidium sp. and Gelidiopsis sp. are identified as agarophytes, the experiments revealed that polysaccharides react with methylene blue, and contain a high sulfate content from which one might infer that they are carrageenans. However, these data also point to the possibility that the polysaccharides may be similar to furoran, a sulfated agarose obtained from the seaweed Gloiopeltis furcata
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