Sustainable soy protein microsponges for efficient removal of lead (II) from aqueous environments

Published in ScienceDirect Publication: International Journal of Biological Macromolecules By

Abstract

Author links open overlay panelSara Anselmo a 1, Tiziana Avola b 1, Kleopatra Kalouta c d, Salvatore Cataldo a, Giuseppe Sancataldo a, Nicola Muratore a, Vito Foderà d, Valeria Vetri a, Alberto Pettignano aShow morehttps://doi.org/10.1016/j.ijbiomac.2023.124276Get rights and contentHighlights•Microsponges with amyloid like properties from Soy proteins are created in aqueous environment.•These structures efficiently remove lead(II) representing sustainable proteins based biomaterials for water purification.•The molecular properties of microsponges can be tuned by varying solution pH affecting lead adsorption efficiency.AbstractProtein-based materials recently emerged as good candidates for water cleaning applications, due to the large availability of the constituent material, their biocompatibility and the ease of preparation. In this work, new adsorbent biomaterials were created from Soy Protein Isolate (SPI) in aqueous solution using a simple environmentally friendly procedure. Protein microsponge-like structures were produced and characterized by means of spectroscopy and fluorescence microscopy methods. The efficiency of these structures in removing Pb2+ ions from aqueous solutions was evaluated by investigating the adsorption mechanisms. The molecular structure and, consequently, the physico-chemical properties of these aggregates can be readily tuned by selecting the pH of the solution during production. In particular, the presence of β-structures typical of amyloids as well as an environment characterized by a lower dielectric constant seem to enhance metal binding affinity revealing that hydrophobicity and water accessibility of the material are key features affecting the adsorption efficiency. Presented results provide new knowledge on how raw plant proteins can be valorised for the production of new biomaterials. This may offer extraordinary opportunities towards the design and production of new tailorable biosorbents which can also be exploited for several cycles of purification with minimal reduction in performance.SynopsisInnovative, sustainable plant-protein biomaterials with tunable properties are presented as green solution for water purification from lead(II) and the structure-function relationship is discussed.KeywordsLeadSoyAmyloid superstructuresAdsorptionGreen chemistryWater contaminationRecommended articlesView full text© 2023 Elsevier B.V. All rights reserved.



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