Biodegradation of starch films: the roles of molecular and crystalline structure

Li, Ming, Witt, Torsten, Xie, Fengwei, Warren, Frederick J., Halley, Peter J. and Gilbert, Robert G. (2015) Biodegradation of starch films: the roles of molecular and crystalline structure. Carbohydrate Polymers, 122 115-122. doi:10.1016/j.carbpol.2015.01.011

Author Li, Ming
Witt, Torsten
Xie, Fengwei
Warren, Frederick J.
Halley, Peter J.
Gilbert, Robert G.
Title Biodegradation of starch films: the roles of molecular and crystalline structure
Journal name Carbohydrate Polymers   Check publisher's open access policy
ISSN 0144-8617
Publication date 2015-05-20
Sub-type Article (original research)
DOI 10.1016/j.carbpol.2015.01.011
Open Access Status
Volume 122
Start page 115
End page 122
Total pages 8
Place of publication Kidlington, Oxford, United Kingdom
Publisher Elsevier
Collection year 2016
Language eng
Abstract The influences of molecular, crystalline and granular structures on the biodegradability of compressionmolded starch films were investigated. Fungal -amylase was used as model degradation agent. The substrates comprised varied starch structures obtained by different degrees of acid hydrolysis, different granular sizes using size fractionation, and different degrees of crystallinity by aging for different times (up to 14 days). Two stages are identified for unretrograded films by fitting degradation data using firstorder kinetics. Starch films containing larger molecules were degraded faster, but the rate coefficient was independent of the granule size. Retrograded films were degraded much slower than unretrograded ones, with a similar rate coefficient to that in the second stage of unretrograded films. Although initially the smaller molecules or the easily accessible starch chains on the amorphous film surface were degraded faster, the more ordered structure (resistant starch) formed from retrogradation, either before or during enzymatic degradation, strongly inhibits film biodegradation.
Keyword Bioplastic
Enzymatic degradation
Molecular structure
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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