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Volume 3, Issue 4 (Suppl)
Polym Sci
ISSN: 2471-9935 Polym Sci, an open access journal
October 12-13, 2017 Osaka, Japan
Annual Meeting on
Biopolymers and Drug Delivery Systems
Biopolymers Meeting 2017
October 12-13 2017
Page 25
Concentration regimes of biopolymers xanthan, tara and clairana, comparing dynamic light scattering and
distribution of relaxation time
Patricia Diaz de Oliveria
1
, Ricardo C Michel
2
, Alan J A McBride
1
, Angelita da Silveira Moreira
1
, Rosana F T Lomba
3
and Claire T Vendruscolo
1
1
Federal University of Pelotas, Brazil
2
Federal University of Rio de Janeiro, Brazil
3
Well Engineering Technology Research and Development Centre Petrobras, Brazil
T
he aim of this work was to evaluate the utilization of analysis of the Distribution of Relaxation Time (DRT) using a dynamic
light back-scattering technique as alternative method for the determination of the concentration regimes in aqueous solutions of
biopolymers (xanthan, clairana and tara gums) by an analysis of the overlap (c*) and aggregation (c**) concentrations. The diffusion
coefficients were obtained over a range of concentrations for each biopolymer using two methods. The first method analyzed the
behavior of the diffusion coefficient as a function of the concentration of the gum solution. This method is based on the analysis of
the diffusion coefficient versus the concentration curve. Using the slope of the curves, it was possible to determine the c* and c**
for xanthan and tara gum. However, it was not possible to determine the concentration regimes for clairana using this method. The
second method was based on an analysis of the DRTs, which showed different numbers of relaxation modes. It was observed that
the concentrations at which the number of modes changed corresponded to the c* and c**. Thus, the DRT technique provided as an
alternative method for the determination of the critical concentrations of biopolymers.
Biography
Patricia Diaz de Oliveira is an Adjunct Professor at Federal University of Pelotas, Rio Grande do Sul, Brazil. She holds a degree in Chemical Engineering from
the Federal University of Rio Grande and a Doctorate in Biotechnology from Federal University of Pelotas. Presently, she is doing research at the Biopolymers
Laboratory of UFPel.
bilicadiaz@yhahoo.com.brPatricia Diaz de Oliveria et al., Polym Sci 2017, 3:4
DOI: 10.4172/2471-9935-C1-005