Abstract
In this study, the impact of cutinases from Thermobifida fusca and Fusarium solani pisi on the deinking of old newsprint were evaluated for the first time. When repulped old newsprint was treated with 8 U/g of T. fusca cutinase at pH 8 and 60 \(^{\circ }\)C for 30 min, the brightness of the deinked papers reached 42.01%. With 8 U/g F. solani cutinase at pH 8.5 and 35 \(^{\circ }\)C for 30 min, the brightness reached 41.62%. These brightness values are higher than that achieved using chemical deinking by 5.13 and 4.38%, respectively. These brightness values were also superior to that achieved using commercial lipase in this study and those previously reported using cellulases, hemicellulases, and laccase, which were higher than that achieved using chemical deinking by 2–4%. The mechanical properties of the deinked paper, including tensile index, tear index, and burst index, were also measured. The results showed that the two cutinases had different effects on the paper fibers. In summary, both T. fusca and F. solani pisi cutinases were able to remove ink from old newsprint more efficiently than alkaline chemistry or other enzymes. This study provides a potential strategy to deink efficiently old newsprint using cutinase.
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The study was financed by the Production and Research Prospective Joint Research Project of Jiangsu Province (BY2015019-18), the Natural Science Foundation of Jiangsu Province (BK20140132), the National Science Fund for Distinguished Young Scholars (31425020), and the Project of Outstanding Scientific and Technological Innovation Group of Jiangsu Province.
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Hong, R., Su, L., Chen, S. et al. Comparison of cutinases in enzymic deinking of old newsprint. Cellulose 24, 5089–5099 (2017). https://doi.org/10.1007/s10570-017-1424-5
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DOI: https://doi.org/10.1007/s10570-017-1424-5