Cutinases catalyze polyacrylate hydrolysis and prevent their aggregation

During the recycling of waste paper, the accumulation of polyacrylates present in the waste paper causes the formation of tacky substances known as stickies. Deposition of these stickies on the machinery decreases the quality of the recycled paper and increases the usage of circulating water. Enzyme...

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Bibliographic Details
Published in:Polymer degradation and stability 2019-01, Vol.159, p.23-30
Main Authors: Hong, Ruoyu, Su, Lingqia, Wu, Jing
Format: Article
Language:English
Subjects:
Acrylic resins
Biodegradation
Catalysis
Cutinase
Deposition
Fungi
Hydrologic analysis
Hydrolysis
Polyacrylate
Recycling
Substrates
Turbidity
Water circulation
Water reuse
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Summary:During the recycling of waste paper, the accumulation of polyacrylates present in the waste paper causes the formation of tacky substances known as stickies. Deposition of these stickies on the machinery decreases the quality of the recycled paper and increases the usage of circulating water. Enzymes that hydrolyze these polyacrylates can minimize or eliminate the deposition of stickies. In initial experiments, the abilities of the cutinases from Humicola insolens, Fusarium solani and Thermobifida fusca to hydrolyze poly (methyl acrylate) (PMA) and poly (ethyl acrylate) (PEA) within a macroporous resin were compared. Then, to simulate the environment encountered during paper recycling, PMA and PEA dispersions were used as substrates. The decrease in turbidity was measured at a concentration of 0.5 mg mL−1. When used at pH 8.0 and 30–50 °C, T. fusca cutinase limited the turbidity decrease to about 1.0% and favored the hydrolysis of PEA over PMA. F. solani and H. insolens cutinases performed best at pH 8.5 and temperatures of 35 and 50 °C, respectively. At a polyacrylate concentration of 0.1 mg mL−1, the optimal temperatures of these cutinases decreased. The optimal T. fusca cutinase dosage was lower than those of F. solani and H. insolens cutinases. •Cutinases were used to hydrolyze the polymethyl and polyethyl acrylates.•Cutinases from H. insolens, F. solani and T. fusca were compared.•Cutinases limited the aggregation of polyacrylate dispersions.•T. fusca cutinase exhibited a better efficiency among the cutinases tested.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2018.10.028