Extruded Porous Protein-Lignocellulosic Blends as Fully Bio-Based Alternative to Single-Use Absorbent Plastics
Journal article, 2025

Sustainable technologies have enabled the production of degradable single-use plastics (SUPs) for various applications. However, environmentally friendly, porous disposable absorbents still lack the competitive functionality of synthetic options. In this work, we report the continuous extrusion of fully biopolymer-based porous absorbents derived from integrated proteins and lignocellulosic residues, all sourced from biomass waste. The results show that the saline absorption capacity of the extruded materials increases 1.5 times compared to the reference solely by including oat husk, a lignocellulosic byproduct from the food industry. The absorption was further improved 2 times by including a delignification step on the oat husk and wheat bran, demonstrating the importance of the biomass's chemistry in increasing the material's absorption. Here, the addition of 20 wt % of Keratin fibers from food waste increases the material's absorbency to 6.5 g/g, with the ability to retain 2 g/g of the saline solution in its structure, which is also the highest reported value for extruded protein-based formulations so far. This work advances the development of porous absorbent materials with competitive performance, utilizing industrial methods and upcycling undervalued biomass waste into sustainable consumer products. Introducing porous biopolymer-based materials as alternatives to synthetic counterparts used in the hygiene and sanitary industries ensures the return of safe molecules to nature, paving the way for microplastic-free, single-use, porous absorbents.

biofillers

extrusion

single-use absorbents

biopolymerblends

porous materials

Author

Athanasios Latras

Royal Institute of Technology (KTH)

Pamela Freire De Moura Pereira

Chalmers, Life Sciences, Industrial Biotechnology

Amparo Jimenez Quero

Chalmers, Life Sciences, Industrial Biotechnology

Karin Odelius

Royal Institute of Technology (KTH)

Mercedes Jimenez-Rosado

Universidad de Leon

Antonio J. Capezza

Royal Institute of Technology (KTH)

ACS APPLIED POLYMER MATERIALS

2637-6105 (ISSN)

Vol. In Press

Exploring aCtive edible materials based on pHenolic-biocOnjugates from agro-industrial by-products for Sustainable and healthy future food packaging (ECHOS)

European Commission (EC) (EC/HE/101107449), 2024-01-01 -- 2025-12-31.

Subject Categories (SSIF 2025)

Materials Chemistry

Energy Engineering

DOI

10.1021/acsapm.5c02445

More information

Latest update

10/21/2025