Protein Adsorption Tailors the Surface Energies and Compatibility between Polylactide and Cellulose Nanofibrils

Alexey Khakalo; Ilari Filpponen; Orlando J. Rojas

doi:10.1021/acs.biomac.7b00173

Protein Adsorption Tailors the Surface Energies and Compatibility between Polylactide and Cellulose Nanofibrils

Alexey Khakalo, Ilari Filpponen^* (Corresponding Author), Orlando J. Rojas (Corresponding Author)

^*Corresponding author for this work

Not published at VTT

Research output: Contribution to journal › Article › Scientific › peer-review

19 Citations (Scopus)

Abstract

The state of dispersion and the interactions between a polymer and a filler in a nanocomposite crucially define its properties and performance. The affinity of polylactide (PLA) with vegetable and animal proteins (casein, gelatin, soy protein isolate, and hydrolysate) is investigated and their role as eco-friendly dispersants and compatibilizers of cellulose nanofibrils (CNF) is elucidated. The affinity of the proteins with PLA is determined by using sensograms acquired by electroacoustic (quartz crystal microgravimetry) and optical (surface plasmon resonance) techniques. The surface energy of PLA increases upon protein adsorption while the opposite effect is observed for CNF, under identical experimental conditions. A significant improvement in the thermodynamic work of adhesion for PLA/CNF systems is predicted by application of the denatured proteins at low concentrations (∼20% and ∼15% enhancement with soy protein and casein at pH 3 and pH 8, respectively). We offer a robust method to screen denatured proteins and to tailor the wettability and material compatibility in the synthesis of bionanocomposites based on CNF and PLA.

Original language	English
Pages (from-to)	1426-1433
Number of pages	8
Journal	Biomacromolecules
Volume	18
Issue number	4
DOIs	https://doi.org/10.1021/acs.biomac.7b00173
Publication status	Published - 10 Apr 2017
MoE publication type	A1 Journal article-refereed

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title = "Protein Adsorption Tailors the Surface Energies and Compatibility between Polylactide and Cellulose Nanofibrils",

abstract = "The state of dispersion and the interactions between a polymer and a filler in a nanocomposite crucially define its properties and performance. The affinity of polylactide (PLA) with vegetable and animal proteins (casein, gelatin, soy protein isolate, and hydrolysate) is investigated and their role as eco-friendly dispersants and compatibilizers of cellulose nanofibrils (CNF) is elucidated. The affinity of the proteins with PLA is determined by using sensograms acquired by electroacoustic (quartz crystal microgravimetry) and optical (surface plasmon resonance) techniques. The surface energy of PLA increases upon protein adsorption while the opposite effect is observed for CNF, under identical experimental conditions. A significant improvement in the thermodynamic work of adhesion for PLA/CNF systems is predicted by application of the denatured proteins at low concentrations (∼20% and ∼15% enhancement with soy protein and casein at pH 3 and pH 8, respectively). We offer a robust method to screen denatured proteins and to tailor the wettability and material compatibility in the synthesis of bionanocomposites based on CNF and PLA.",

author = "Alexey Khakalo and Ilari Filpponen and Rojas, {Orlando J.}",

note = "Funding Information: This work was part of ACel program of the Finnish Bioeconomy Cluster (FIBIC LTD), financially supported by the Finnish Funding Agency for Technology and Innovation (TEKES). We also acknowledge funding support by the Academy of Finland, through project {"}3D-manufacturing of novel biomaterials{"} (2228357-4) under the Biofuture 2025 initiative. We made use of the Aalto University Nanomicroscopy Center (Aalto-NMC) premises. The authors are also grateful to the Academy of Finland{\textquoteright}s Centres of Excellence Programme (2014−2019). The assistance of Anu Anttila and Ritva Kivel{\"a}with CA measurements and AFM imaging is highly appreciated. Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",

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AU - Filpponen, Ilari

AU - Rojas, Orlando J.

N1 - Funding Information: This work was part of ACel program of the Finnish Bioeconomy Cluster (FIBIC LTD), financially supported by the Finnish Funding Agency for Technology and Innovation (TEKES). We also acknowledge funding support by the Academy of Finland, through project "3D-manufacturing of novel biomaterials" (2228357-4) under the Biofuture 2025 initiative. We made use of the Aalto University Nanomicroscopy Center (Aalto-NMC) premises. The authors are also grateful to the Academy of Finland’s Centres of Excellence Programme (2014−2019). The assistance of Anu Anttila and Ritva Kiveläwith CA measurements and AFM imaging is highly appreciated. Publisher Copyright: © 2017 American Chemical Society.

PY - 2017/4/10

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N2 - The state of dispersion and the interactions between a polymer and a filler in a nanocomposite crucially define its properties and performance. The affinity of polylactide (PLA) with vegetable and animal proteins (casein, gelatin, soy protein isolate, and hydrolysate) is investigated and their role as eco-friendly dispersants and compatibilizers of cellulose nanofibrils (CNF) is elucidated. The affinity of the proteins with PLA is determined by using sensograms acquired by electroacoustic (quartz crystal microgravimetry) and optical (surface plasmon resonance) techniques. The surface energy of PLA increases upon protein adsorption while the opposite effect is observed for CNF, under identical experimental conditions. A significant improvement in the thermodynamic work of adhesion for PLA/CNF systems is predicted by application of the denatured proteins at low concentrations (∼20% and ∼15% enhancement with soy protein and casein at pH 3 and pH 8, respectively). We offer a robust method to screen denatured proteins and to tailor the wettability and material compatibility in the synthesis of bionanocomposites based on CNF and PLA.

AB - The state of dispersion and the interactions between a polymer and a filler in a nanocomposite crucially define its properties and performance. The affinity of polylactide (PLA) with vegetable and animal proteins (casein, gelatin, soy protein isolate, and hydrolysate) is investigated and their role as eco-friendly dispersants and compatibilizers of cellulose nanofibrils (CNF) is elucidated. The affinity of the proteins with PLA is determined by using sensograms acquired by electroacoustic (quartz crystal microgravimetry) and optical (surface plasmon resonance) techniques. The surface energy of PLA increases upon protein adsorption while the opposite effect is observed for CNF, under identical experimental conditions. A significant improvement in the thermodynamic work of adhesion for PLA/CNF systems is predicted by application of the denatured proteins at low concentrations (∼20% and ∼15% enhancement with soy protein and casein at pH 3 and pH 8, respectively). We offer a robust method to screen denatured proteins and to tailor the wettability and material compatibility in the synthesis of bionanocomposites based on CNF and PLA.

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Protein Adsorption Tailors the Surface Energies and Compatibility between Polylactide and Cellulose Nanofibrils

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