Shear interfacial viscoelasticity of native and hydrophobically modified xanthan at oil/water interface

Shear interfacial viscoelasticity of native and hydrophobically modified xanthan at oil/water... In this study, we investigate the shear viscoelasticity of xanthan and hydrophobically modified xanthans at silicone oil/water interface. Xanthan is well known to adopt two distinct conformations in water solution, a rigid conformation at low temperature and a flexible one at high temperature. Hence, we first studied the un-modified xanthan as a function of temperature and showed that its interfacial viscoelasticity depends on the xanthan conformation as in bulk but evolves the opposite way after heating: i.e., the bulk viscoelasticity is weakened after thermal treatment while interfacial viscoelasticity is reinforced. Ergo, we proved that for xanthan, bulk and interfacial viscoelastic properties act independently. Then, we investigated the effect of hydrophobic modification of xanthan on its interfacial properties. We demonstrated that, before any thermal treatment, the more grafted the polymer, the higher the interfacial elasticity confirming the potential stabilizing properties of such modified polysaccharides. The interfacial properties of modified xanthans are also improved after thermal treatment but the improvement is much less pronounced for grafting densities above 8% which is explained by different chains organization at the interface. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Food Hydrocolloids Elsevier

Shear interfacial viscoelasticity of native and hydrophobically modified xanthan at oil/water interface

Loading next page...
 
/lp/elsevier/shear-interfacial-viscoelasticity-of-native-and-hydrophobically-HRo7I3mWJw
Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier Ltd
ISSN
0268-005X
eISSN
1873-7137
D.O.I.
10.1016/j.foodhyd.2016.07.016
Publisher site
See Article on Publisher Site

Abstract

In this study, we investigate the shear viscoelasticity of xanthan and hydrophobically modified xanthans at silicone oil/water interface. Xanthan is well known to adopt two distinct conformations in water solution, a rigid conformation at low temperature and a flexible one at high temperature. Hence, we first studied the un-modified xanthan as a function of temperature and showed that its interfacial viscoelasticity depends on the xanthan conformation as in bulk but evolves the opposite way after heating: i.e., the bulk viscoelasticity is weakened after thermal treatment while interfacial viscoelasticity is reinforced. Ergo, we proved that for xanthan, bulk and interfacial viscoelastic properties act independently. Then, we investigated the effect of hydrophobic modification of xanthan on its interfacial properties. We demonstrated that, before any thermal treatment, the more grafted the polymer, the higher the interfacial elasticity confirming the potential stabilizing properties of such modified polysaccharides. The interfacial properties of modified xanthans are also improved after thermal treatment but the improvement is much less pronounced for grafting densities above 8% which is explained by different chains organization at the interface.

Journal

Food HydrocolloidsElsevier

Published: Dec 1, 2016

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off