Amino Starches as pH-Sensitive Coatings: Synthesis and Application

The aim of this work was to carry out a systematic investigation of the preparation conditions of starch materials with pH‐dependent solubility. Furthermore, appropriate conditions for application of those materials as surface coatings should be established. Thus, samples of starch derivatives with...

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Bibliographic Details
Published in:Die Stärke 2007-05, Vol.59 (5), p.208-216
Main Authors: Bohrisch, Jörg, Zimmermann, Arvid
Format: Article
Language:English
Subjects:
amphiphilic
Biological and medical sciences
Cereal and baking product industries
Food industries
Fundamental and applied biological sciences. Psychology
pH-Dependent solubility
Starch
Starch and starchy product industries
Starch, amphiphilic
Tertiary amine
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Summary:The aim of this work was to carry out a systematic investigation of the preparation conditions of starch materials with pH‐dependent solubility. Furthermore, appropriate conditions for application of those materials as surface coatings should be established. Thus, samples of starch derivatives with tertiary amino substituents were synthesised and characterised by 1H‐NMR spectroscopy and pH‐turbidimetry. Variation of both kind and molar mass of the used starch substrate and the nature and degree of substitution of the amino component led to two materials containing diisopropylamino groups with the desired properties in a single‐ or two‐component coating. Using a commercial fluidised‐bed coating procedure spherules of a waxy surfactant were coated with different modified starches. The stabilities of the shells were examined under dishwasher‐like conditions and monitored by tensiometry.
ISSN:0038-9056
1521-379X
DOI:10.1002/star.200600575