Citation
Okamoto A., . and Ozawa T., . and Arai Y., . (1991) Studies on the deterioration mechanism of sago starch. [Proceedings Paper]
Abstract
The colouring mechanism of sago starch and the factors affecting the process were studied for the purpose of improving its colour. Two important mechanisms were found. One is by adsorption of coloured substance to the starch and the other is through oxidation of adsorbed catechin at the surface of starch. Adsorption of coloured substance and catechin onto starch took place immediately after they come into contact. Furthermore the amount of the coloured substance as well as catechin adsorbed varied proportionally to their external concentrations in solutions where the starch was suspended. Ferric and ferrous ions produced dark coloured compounds with catechin in presence of polyphenol oxidase thus reducing the value of the starch. The quality of processing water also affected the colour of the starch. In wet condition coloured starch could be cleaned to some extent by detergents but not so after drying
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Abstract
The colouring mechanism of sago starch and the factors affecting the process were studied for the purpose of improving its colour. Two important mechanisms were found. One is by adsorption of coloured substance to the starch and the other is through oxidation of adsorbed catechin at the surface of starch. Adsorption of coloured substance and catechin onto starch took place immediately after they come into contact. Furthermore the amount of the coloured substance as well as catechin adsorbed varied proportionally to their external concentrations in solutions where the starch was suspended. Ferric and ferrous ions produced dark coloured compounds with catechin in presence of polyphenol oxidase thus reducing the value of the starch. The quality of processing water also affected the colour of the starch. In wet condition coloured starch could be cleaned to some extent by detergents but not so after drying
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| Additional Information: | 6 tables; 8 refs.; Summary En |
| AGROVOC Term: | SAGU |
| AGROVOC Term: | ALMIDON |
| AGROVOC Term: | DETERIORO |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Norfaezah Khomsan |
| Last Modified: | 24 Apr 2025 05:26 |
| URI: | http://webagris.upm.edu.my/id/eprint/15034 |
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