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Studies on the deterioration mechanism of sago starch

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 s...

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Main Authors: Okamoto, A., Ozawa, T., Arai, Y. (Tsukuba Univ., Tsukuba-Shi, Ibaraki-Ken (Japan). Inst. of Applied Biochemistry)
Format: Proceedings Paper
Language:English
Published: Ministry of Agriculture and Community Development 2013
Subjects:
SAGOU
AMIDON
DETERIORATION
SAGU
ALMIDON
DETERIORO
Online Access:http://agris.upm.edu.my:8080/dspace/handle/0/4914
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spelling oai:http:--agris.upm.edu.my:0-4914Studies on the deterioration mechanism of sago starchOkamoto, A.Ozawa, T.Arai, Y. (Tsukuba Univ., Tsukuba-Shi, Ibaraki-Ken (Japan). Inst. of Applied Biochemistry)SAGOUAMIDONDETERIORATIONSAGUALMIDONDETERIOROThe 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 dryingMinistry of Agriculture and Community DevelopmentSarawak (Malaysia)2013-09-27T01:59:16Z2013-09-27T01:59:16Z1991Proceedings PaperArticleNon-RefereedTowards greater advancement of the sago industry in the 90's: proceedings of the Fourth International Sago Symposium: Sarawak (Malaysia), 6-9 Aug 1990, p. 158-165http://agris.upm.edu.my:8080/dspace/handle/0/4914MY9305238en
institution AGRIS
collection AGRIS
language English
topic SAGOU
AMIDON
DETERIORATION
SAGU
ALMIDON
DETERIORO
spellingShingle SAGOU
AMIDON
DETERIORATION
SAGU
ALMIDON
DETERIORO
Okamoto, A.
Ozawa, T.
Arai, Y. (Tsukuba Univ., Tsukuba-Shi, Ibaraki-Ken (Japan). Inst. of Applied Biochemistry)
Studies on the deterioration mechanism of sago starch
description 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
format Proceedings Paper
author Okamoto, A.
Ozawa, T.
Arai, Y. (Tsukuba Univ., Tsukuba-Shi, Ibaraki-Ken (Japan). Inst. of Applied Biochemistry)
author_facet Okamoto, A.
Ozawa, T.
Arai, Y. (Tsukuba Univ., Tsukuba-Shi, Ibaraki-Ken (Japan). Inst. of Applied Biochemistry)
author_sort Okamoto, A.
title Studies on the deterioration mechanism of sago starch
title_short Studies on the deterioration mechanism of sago starch
title_full Studies on the deterioration mechanism of sago starch
title_fullStr Studies on the deterioration mechanism of sago starch
title_full_unstemmed Studies on the deterioration mechanism of sago starch
title_sort studies on the deterioration mechanism of sago starch
publisher Ministry of Agriculture and Community Development
publishDate 2013
url http://agris.upm.edu.my:8080/dspace/handle/0/4914
_version_ 1782770156499369984
score 12.935284

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