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Sustainable Biobased Protein Superabsorbents from Agricultural Co-Products

Capezza Villa, Antonio José (2020). Sustainable Biobased Protein Superabsorbents from Agricultural Co-Products. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-624-6
eISBN 978-91-7760-625-3
[Doctoral thesis]

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The preparation of sustainable protein superabsorbents from agricultural industry side-streams is reported. Wheat gluten (WG), a coproduct from the ethanol/starch industry, was processed into foams with sponge-like behavior and high liquid uptake. The materials were obtained by phase-separation of aqueous WG dispersions followed by ambient drying, or by lyophilization. The use of a natural and non-toxic cross-linker (genipin) resulted in foams with high water swelling properties (~18 g/g in 10 min). The rapid swelling may be of use in bio-based foams in e.g., sanitary pads.

As an alternative, potato protein concentrate (PPC, side-stream from the starch industry), was functionalized and prepared as particles. The liquid swelling capacity was compared after acylation with five different agents. It is shown that the PPC can be acylated to replicate the chemistry of synthetic superabsorbent polymers (SAP), showing water swelling capacity >10 g/g. The acylation (using EDTAD) of WG suspensions resulted in protein particles with water and saline uptake of 22 and 5 g/g, respectively. Limited network stability was however observed when acylating WG in low-protein suspensions. This was addressed by mixing the acylated protein with genipin, which provided a stable protein network. The process gave functionalized particles with swelling capacity ~40 g/g and ~80 % retention of swelling in centrifuge retention tests.

The extrusion of WG showed that porous WG with water uptake of 500 % can be produced. Further, the scalability of PPC production was pilottested by functionalizing potato fruit juice (PFJ), containing the potato protein in its soluble state before the industrial drying used to obtain PPC. This resulted in water swelling capacities >10 g/g, which was comparable to the PPC-functionalized materials. The results pave the way for future optimization of high-throughput production techniques using protein sources in mass production of sustainable protein-based SAPs.

Authors/Creators:Capezza Villa, Antonio José
Title:Sustainable Biobased Protein Superabsorbents from Agricultural Co-Products
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2020
Number of Pages:86
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-624-6
ISBN for electronic version:978-91-7760-625-3
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 205 Materials Engineering > Textile, Rubber and Polymeric Materials
(A) Swedish standard research categories 2011 > 1 Natural sciences > 104 Chemical Sciences > Polymer Chemistry
(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 204 Chemical Engineering > Polymer Technologies
Keywords:proteins, circularity, superabsorbents, sustainability, acylation, extrusion
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ID Code:17574
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Plant Breeding (from 130101)
Deposited By: SLUpub Connector
Deposited On:22 Sep 2020 07:17
Metadata Last Modified:15 Jan 2021 19:19

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