Hydrophilic, hydrophobic, Janus and multilayer xanthan based cryogels

Author(s)

Toledo, Paulo V. O. ^[1] ; Petri, Denise F. S. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Chem, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo - Brazil

• Document type: Journal article
• Source: International Journal of Biological Macromolecules; v. 123, p. 1180-1188, FEB 15 2019.
• Web of Science Citations: 2

Abstract

Xanthan gum (XG) was applied for the creation of hydrophilic, hydrophobic and layered cryogels. Firstly, the correlation among synthesis parameters, such as solvent composition and polymer concentration (C-p) in the precursor gel and mold diameter (Phi), with physicochemical properties and morphological parameters of resulting hydrophilic XG cryogels was investigated. The addition of acetic acid to the precursor led to stiffer XG cryogels. The reduction of C-p and Phi promoted the increase in the cryogels surface area and porosity. Then, XG cryogels were silanized in order to produce hydrophobic cryogels, which presented sorption capacities for diesel, mineral and sunflower oils of 28 +/- 2 g/g, 16 +/- 2 g/g and 5.2 +/- 0.3 g/g, respectively. The hydrophobic XG cryogels were considerably more efficient to remove ethinyl estradiol, an estrogenic pollutant, from liquid media than the hydrophilic cryogels. Hydrophilic and hydrophobic XG cryogels presented similar capacity to remove bisphenol A, another estrogenic pollutant, from liquid media. A new family of alternated hydrophobic/hydrophilic ``Janus{''} like and multilayered cryogels was created and applied in mixtures of diesel oil and water or oil/water emulsions. The ``Janus{''} like and multilayered cryogels remained at the interface, where the hydrophobic and hydrophilic layers adsorbed oil and water selectively. (C) 2018 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 15/25103-2 - Magnetic stimuli in biotechnological processes
• Grantee: Denise Freitas Siqueira Petri
• Support Opportunities: Regular Research Grants