Details

Autor(en) / Beteiligte

• Folch-Cano, Christian
• Olea-Azar, Claudio
• Speisky, Hernán

Titel

Structural and thermodynamic factors on the adsorption process of phenolic compounds onto polyvinylpolypyrrolidone

Ist Teil von

• Colloids and surfaces. A, Physicochemical and engineering aspects, 2013-02, Vol.418, p.105-111

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] ► Adsorption depends on the PC molecular size, number and availability of its OH groups. ► The adsorption onto PVPP of some pure PC corresponds to a physisorption process. ► Adsorption process was spontaneous and enthalpically-driven for C. ► The adsorption processes were spontaneous and entropically-driven for EGCG and GA. ► These results implicate potential uses of selective-adsorption of PC. In this study we find the possible structural factors that can determine the adsorption process of some pure phenolic compounds (PC) onto polyvinylpolypyrrolidone (PVPP), analyzing their adsorption isotherms by using the Langmuir and the Freundlich theories. In this perspective, the adsorption capacity of short size PC would depend on the number and availability of its hydroxyl groups. To intermediate molecular size PC, the improvement in the adsorption capacity presumably depends on its resemblance with the resveratrol molecule. To large size PC, the adsorption capacity was considerably high due to hydroxyl groups disposed in different spatial orientations with respect to the plane. Thermodynamic analyses showed that adsorption onto PVPP of some pure PC correspond to a physisorption process that was spontaneous and enthalpically-driven for PC like catechin (C) and entropically-driven for PC like epigallocatechin gallate (EGCG) and gallic acid (GA). These results implicate potential selective adsorption uses of PVPP.