Microwave-assisted synthesis of zinc derivatives of potato starch

Hanna Staroszczyk; Piotr Janas

doi:10.1016/j.carbpol.2010.01.013

Microwave-assisted synthesis of zinc derivatives of potato starch

Abstract

Zincatated potato starch was prepared in a solid-state, microwave-assisted reaction using generated in situ sodium tetrahydroxozincate [Na2Zn(OH)4]. For comparison, zincatation of starch was also carriedout on convectional heating. Depending on the irradiation conditions, the products of either mono- or crosslinking esterification were formed. Higher power applied at shorter exposition offered products ofmonoesterification, and the lower power at longer exposition favoured crosslinking of starch. The microwave-assisted processes were faster than these proceeding on convectional heating. The reaction time was reduced from 120 to 30 min. The crystallinity of resulting products gradually ceased with increased concentration of introduced zincate but their granularity was retained independently of that concentration. The thermal stability of the products was slightly lower than that of native starch. Already reaction product prepared with the smallest dose of zincate had significantly decreased melting temperature and melting enthalpy and, simultaneously, increased aqueous solubility as well as water binding capacity compared to non-processed starch.

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: CARBOHYDRATE POLYMERS no. 80, pages 962 - 969,
ISSN: 0144-8617
Language:: English
Publication year:: 2010
Bibliographic description:: Staroszczyk H., Janas P.: Microwave-assisted synthesis of zinc derivatives of potato starch// CARBOHYDRATE POLYMERS. -Vol. 80, nr. iss. 3 (2010), s.962-969
DOI:: Digital Object Identifier (open in new tab) 10.1016/j.carbpol.2010.01.013
Verified by:: Gdańsk University of Technology