Agar polysaccharides from Gracilaria species (Rhodophyta, Gracilariaceae).
Yield, physical and chemical properties of agar from three agarophytes species (Gracilaria gracilis, G. dura and G. bursa-pastoris) were determined. The agar yield from the three species varied significantly (P<0.01). The highest yields of agar (34.8%) and the lowest (30%) were obtained from G. bursa-pastoris and G. gracilis, respectively. Highest gel strength (630+/-15 g cm(-2)) was obtained from agar extracted from G. gracilis and lowest from G. bursa-pastoris (26+/-3.6 g cm(-2)). The values of 3,6-anhydrogalactose were similar for G. gracilis and G. dura and there were no significant differences among the species. The sulfate contents varied significantly (P<0.01) and the higher value was obtained from G. bursa-pastoris. Among the three species, G. gracilis showed superior agar quality than the other two species, hence it can be considered a good potential source for industrial use.
Marinho-Soriano
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Departamento de Oceanografia e Limnologia, Laboratório de Macroalgas, Universidade Federal do Rio Grande do Norte, Via Costeira, Praia de Mãe Luiza s/n, 59014-100, NatalRN, Brazil. elaine.soriano@eol.com.br
D000362:Agar / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry / Q000302:isolation & purification*; D000461:Rhodophyta / Q000737:chemistry*
D011134:Polysaccharides; D000362:Agar