Identification of selected seaweed polysaccharides (phycocolloids) by vibrational spectroscopy (FTIR-ATR and FT-Raman)

• Published in: Food hydrocolloids Vol. 23; no. 7; pp. 1903 - 1909
• Main Authors: Pereira, Leonel, Amado, Ana M., Critchley, Alan T., van de Velde, Fred, Ribeiro-Claro, Paulo J.A.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.10.2009; [New York, NY]: Elsevier Science; Elsevier
• Subjects: agar; Algae; alginates; Aqueous solutions; Biological and medical sciences; Carrageenan; carrageenan gels; chemical analysis; chemical composition; Food additives; Food industries; Foods; Fourier transform infrared spectroscopy; FT-Raman; FTIR-ATR; Fundamental and applied biological sciences. Psychology; General aspects; Grounds; hydrocolloids; macroalgae; Phycocolloids; Polysaccharides; Raman spectroscopy; Rhodophycota; Seaweed; Seaweeds; Spectroscopy; Seaweed; FTIR-ATR; Polysaccharides; Phycocolloids; Carrageenan; FT-Raman; Gelling agent; Algae; Food additive; FRIR-ATR; Polysaccharide
• ISSN: 0268-005X; 1873-7137
• DOI: 10.1016/j.foodhyd.2008.11.014

The wide industrial application of phycocolloids (e.g. alginates, agar and carrageenans) is based on their particular properties to form gels in aqueous solution. These seaweed polysaccharides present a chemical structure related with the taxonomic position of the algae: carrageenans are produced by carrageenophytes (red algae belonging mainly to the genera Kappaphycus, Eucheuma, Chondrus, Gigartina and Chondracanthus). Recently, new spectroscopic techniques have provided more accurate identification of the natural composition of the polysaccharides produced by these seaweeds. With the combination of two spectroscopic techniques (FTIR-ATR and FT-Raman) it is possible to identify the principal seaweed colloids in ground seaweed samples as in extracted material. Since the seaweed samples receive the minimum of handling and treatment (e.g. they are simply dried and ground), the composition determined represents, as accurately as possible, the native composition of the phycocolloids.