Abstracts Book - IMRC 2018

• SB1-P020
OPTICAL PROPERTIES OF CHITOSAN/CARBOXYMETHYL
CELLULOSE POLYELECTROLYTES FILMS LOADED WITH
FLAVYLIUM SALTS
Marysol Sauzameda 1,2
1 Centro de Investigación en Materiales Avanzados, S.C., Laboratorio de Análisis Térmico,
Mexico. 2 Universidad Autónoma de Chihuahua, Facultad de Ciencias Químicas, Mexico.
The development of polymers with response to different external stimuli is a field
of great potential in fields like medicine, materials science and chemistry.[1]
Nevertheless, there are limitations in the research of polymeric sensors, such as the
search of ideal mechanical properties, analyte sensivity, thermal stability and
availability of raw materials. Flavylium salts are molecules structurally related with
anthocyanins which respond to pH variations in solution. This compunds have a
chromophoric core and high electron affinity. In numerous studies have presented
promising results in equilibrated solutions at pH 1.2 and 8 making it a great
alternative to provide fluorescent response to polyelectrolytes. making it a great
alternative to provide fluorescent response to polyelectrolytes.[2] In this
contribution, we describe the synthesis of chitosan/carboxymethyl cellulose
polyelectrolytes (CCP). CCP films were obtained by casting /solvent evaporation of
chitosan (Low Molecular Weight approximately 50,000 - 190,000 Da, Aldrich) and
carboxy methyl cellolose (Molecular Weight 90 000 Da, Aldrich).[3] Polyectrolytes
complexes were obtained as homogeneous, yellow and porous films by this
methodology. The materials were characterized by FTIR, Raman spectroscopy, DSC,
TGA, Uv-Vis and emission spectroscopy. CCP were impregnated with different
concentrations of flavylium salts (FS) solutions in acidic media. These films showed
clearly FS pigmentation retained by the polyelectrolyte after receiving thermal
treatment for solvent evaporation. Fluorescence profiles of FS-CCP films showed a
broad band centered around 410 nm. The band is attributed to the sum of the
typical FS emission (450 nm) and the unexpected emission of CPP material (390
nm). FTIR and Raman spectroscopies were also performed to determine the
influence of FS in CCP physicochemical properties. FS-CCP materials described in
this work have potential applications as a new fluorescent polymers.
Acknowledgment: Authors thanks the National Science and Technology
Minister (CB-2013-01 number 222847)for financial funding.
Keywords: polyelectrolyte, fluorescence, flavylium salt
Presenting authors email: myssauza@gmail.com