Environmental friendly polysaccharide modification – rheological properties of oxidized starches water systems

Anna Ptaszek , Marcin Łukasiewicz , Szczepan Bednarz

Abstract

Detailed rheological studies were performed in order to characterize a new class of modified starches. The polysaccharide was oxidized in a paste using H2O2 coupled with sodium tungstate as a catalyst. Oxidation processes were carried out in microwave (µν) and conventional (Δ) conditions. Commercially oxidized starch (E1404) was used as a reference material. Further analysis covers the investigation on polysaccharides chains degradation as a key factor for rheological properties. Pasting properties of the new starches may have approximately 100 times lower viscosity. The viscosity of the paste does not depend on the heating method during the modification process (µν or Δ). According to that, it might be stated that pasting before modification is fundamental for the deep changes of rheological and osmotic properties detected for water solutions of oxidation products. The viscosity which increases with shear rate allows identifying all pastes as shear-thickening systems. Additionally, microscopic analysis was performed (AFM) in order to link the mechanical properties and inner structure of pastes obtained from modified starches. Results obtained allow to conclude that the investigated protocols (oxidation in paste) guide to the new class of oxidized starches. The oxidation follows the strong degradation of the starch, which affects in mechanical properties. The obtained material cannot serve as a thickening agent in food technology, although its properties may lead to other application possibilities like ion exchange or chelating agent.
Author Anna Ptaszek (FoFT / DoEaEFI)
Anna Ptaszek,,
- Department of Engineering and Equipment Food Industry
, Marcin Łukasiewicz (FoFT / DoToC)
Marcin Łukasiewicz,,
- Department of Technology of Carbohydrates
, Szczepan Bednarz
Szczepan Bednarz,,
-
Journal seriesStarch-Starke, ISSN 0038-9056, (A 25 pkt)
Issue year2013
Vol65
No1-2
Pages134-145
Publication size in sheets0.55
Keywords in EnglishFlow curves, Microwaves, Osmotic pressure, Oxidation, Rheology
DOIDOI:10.1002/star.201200032
URL http://onlinelibrary.wiley.com/doi/10.1002/star.201200032/pdf
Internal identifierWTŻ/2013/92
Languageen angielski
Score (nominal)25
ScoreMinisterial score = 25.0, 26-07-2017, ArticleFromJournal
Ministerial score (2013-2016) = 25.0, 26-07-2017, ArticleFromJournal
Publication indicators WoS Citations = 5
Citation count*6 (2016-01-16)
Additional fields
FinansowanieThe Polish State Committee supported the research for Scientific Research Grant No. N31200731/0848.
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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