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Tan Y. N., . and Noor Baiti A. A., . and Ayob M. K., . and Nazaruddin R., . and Foo S. C., . Comparative chemical characteristics of hydrochloric acid- and ammonium oxalate-extracted pectin from roselle (Hibiscus sabdariffa L.) calyces. pp. 281-284. ISSN 22317546