Molecular structure of citric acid cross-linked starch films
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3737115
- author
- Menzel, Carolin ; Olsson, Erik ; Plivelic, Tomás LU ; Andersson, Roger ; Johansson, Caisa ; Kuktaite, Ramune ; Järnström, Lars and Koch, Kristine
- organization
- publishing date
- 2013
- 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}}, }