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Molecular structure of citric acid cross-linked starch films

Menzel, Carolin ; Olsson, Erik ; Plivelic, Tomás LU ; Andersson, Roger ; Johansson, Caisa ; Kuktaite, Ramune ; Järnström, Lars and Koch, Kristine (2013) In Carbohydrate Polymers 96(1). p.270-276
Abstract
The effect of citric acid (CA) on starch films has been examined. A new method to detect cross-linking of starch by CA in solution-cast films by molecular weight measurements is described. Furthermore, we managed to distinguished between free, mono- and di-esterified CA and quantify di-ester content within starch films by using a modification in the method of complexometric titration with copper(II)-sulfate. Cross-linking of starch by CA occurred at low temperature, 70C, which we assumed is so far the lowest temperature reported where cross-linking reaction occurred. This is essential for starch coating applications within paper industry since no high temperatures for curing will be required. However, curing at 150C and high CA... (More)
The effect of citric acid (CA) on starch films has been examined. A new method to detect cross-linking of starch by CA in solution-cast films by molecular weight measurements is described. Furthermore, we managed to distinguished between free, mono- and di-esterified CA and quantify di-ester content within starch films by using a modification in the method of complexometric titration with copper(II)-sulfate. Cross-linking of starch by CA occurred at low temperature, 70C, which we assumed is so far the lowest temperature reported where cross-linking reaction occurred. This is essential for starch coating applications within paper industry since no high temperatures for curing will be required. However, curing at 150C and high CA concentrations, 30 pph, increased cross-linking reaction. Furthermore, the physical properties like water solubility, gel content and glass transition temperature, were highly reflected by changes in the molecular structure i.e. cross-linking and hydrolysis, as well as CA content and curing temperature. (Less)
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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Starch-base films, citric acid, cross-linking, molecular weight, hydrolysis, amorphous starch, plasticization
in
Carbohydrate Polymers
volume
96
issue
1
pages
270 - 276
publisher
Elsevier
external identifiers
  • wos:000320486000034
  • scopus:84877080255
  • pmid:23688480
ISSN
0144-8617
DOI
10.1016/j.carbpol.2013.03.044
language
English
LU publication?
yes
id
089d9d98-172b-4380-b842-f43967b27262 (old id 3737115)
date added to LUP
2016-04-01 10:21:50
date last changed
2022-04-20 01:15:45
@article{089d9d98-172b-4380-b842-f43967b27262,
  abstract     = {{The effect of citric acid (CA) on starch films has been examined. A new method to detect cross-linking of starch by CA in solution-cast films by molecular weight measurements is described. Furthermore, we managed to distinguished between free, mono- and di-esterified CA and quantify di-ester content within starch films by using a modification in the method of complexometric titration with copper(II)-sulfate. Cross-linking of starch by CA occurred at low temperature, 70C, which we assumed is so far the lowest temperature reported where cross-linking reaction occurred. This is essential for starch coating applications within paper industry since no high temperatures for curing will be required. However, curing at 150C and high CA concentrations, 30 pph, increased cross-linking reaction. Furthermore, the physical properties like water solubility, gel content and glass transition temperature, were highly reflected by changes in the molecular structure i.e. cross-linking and hydrolysis, as well as CA content and curing temperature.}},
  author       = {{Menzel, Carolin and Olsson, Erik and Plivelic, Tomás and Andersson, Roger and Johansson, Caisa and Kuktaite, Ramune and Järnström, Lars and Koch, Kristine}},
  issn         = {{0144-8617}},
  keywords     = {{Starch-base films; citric acid; cross-linking; molecular weight; hydrolysis; amorphous starch; plasticization}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{270--276}},
  publisher    = {{Elsevier}},
  series       = {{Carbohydrate Polymers}},
  title        = {{Molecular structure of citric acid cross-linked starch films}},
  url          = {{http://dx.doi.org/10.1016/j.carbpol.2013.03.044}},
  doi          = {{10.1016/j.carbpol.2013.03.044}},
  volume       = {{96}},
  year         = {{2013}},
}