Abstract
The chemical composition of agars extracted from six economically important species of Gracilaria from different geographical sources (Argentina, Brazil, Indonesia, China and Turkey) and one species of Gracilariopsis (G. lemaneiformis) collected from two different Japanese localities was investigated. Agar was extracted by pretreatment with various concentrations of NaOH (3%, 5%, 7%, 10%) for 2 h at 80°C. The sulfate, 3,6-anhyd, rogalactose and methoxyl contents of each agar extract were analyzed. High sulfate and 3,6 anhydrogalactose contents were found in non-alkali treated agar from Turkish Gracilaria gracilis (3.4%) and from Chilean G. chilensis (54.3%) after alkali treatment concentration of 5% NaOH, respectively. High methoxyl contents (4.9%) were obtained from non-alkali treated agar from Chinese G. tenuistipitata.
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Rebello, J., Ohno, M., Ukeda, H. et al. 3,6 anhydrogalactose, sulfate and methoxyl contents of commercial agarophytes from different geographical origins. Journal of Applied Phycology 9, 367–370 (1997). https://doi.org/10.1023/A:1007954220257
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DOI: https://doi.org/10.1023/A:1007954220257