Comparative chemical characteristics of hydrochloric acid- and ammonium oxalate-extracted pectin from roselle (Hibiscus sabdariffa L.) calyces

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

Recent research suggesting the existence of potential source of pectin from roselle calyces. Pectin was successfully extracted from seven different varieties of roselle calyces. Pectin extraction was conducted using hydrochloric acid (HCl 0.03 N pH 1.5) or ammonium oxalate (0.25 w/v pH 4.6) at 85oC for 1 h. Chemical characteristics of the HCl- and ammonium oxalate extracted pectin were compared. Results indicated that ammonium oxalate exhibited greater efficiency in pectin extraction than HCl. Highest pectin yield at 18.7 was obtained by ammonium oxalate extraction of roselle calyx variety Acc.6 compared to only 9.77 by HCl extraction. The lowest pectin yield at 11.3 and 5.78 were observed respectively in ammonium oxalate and HCl extractions of roselle calyx variety UKMR-3. Some important characteristics of ammonium oxalate extracted pectin of roselle Acc.6 were 5.98 moisture 3.81 ash 4.64 methoxyl content 42.24 anhydrouronic acid (AUA) and degree of esterification (DE) 60. This study suggested that the high DE roselle pectin is an alternative source of pectin for food industry.

Full text available from: Official URL: http://ifrj.upm.edu.my/20%20(01)%202013/37%20IFRJ%...

Abstract

Recent research suggesting the existence of potential source of pectin from roselle calyces. Pectin was successfully extracted from seven different varieties of roselle calyces. Pectin extraction was conducted using hydrochloric acid (HCl 0.03 N pH 1.5) or ammonium oxalate (0.25 w/v pH 4.6) at 85oC for 1 h. Chemical characteristics of the HCl- and ammonium oxalate extracted pectin were compared. Results indicated that ammonium oxalate exhibited greater efficiency in pectin extraction than HCl. Highest pectin yield at 18.7 was obtained by ammonium oxalate extraction of roselle calyx variety Acc.6 compared to only 9.77 by HCl extraction. The lowest pectin yield at 11.3 and 5.78 were observed respectively in ammonium oxalate and HCl extractions of roselle calyx variety UKMR-3. Some important characteristics of ammonium oxalate extracted pectin of roselle Acc.6 were 5.98 moisture 3.81 ash 4.64 methoxyl content 42.24 anhydrouronic acid (AUA) and degree of esterification (DE) 60. This study suggested that the high DE roselle pectin is an alternative source of pectin for food industry.

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Item Type:	Article
AGROVOC Term:	Hydrochloric acid
AGROVOC Term:	Ammonium
AGROVOC Term:	Pectins
AGROVOC Term:	Roselle
AGROVOC Term:	Hibiscus sabdariffa
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	26 Apr 2025 15:10
URI:	http://webagris.upm.edu.my/id/eprint/21616

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