Features of Solubilizing Effect of Amphiphilic Compounds during Pulp Deresination
DOI:
https://doi.org/10.37482/0536-1036-2021-1-180-191Keywords:
solubilization, pulp deresination, lipase, surfactantsAbstract
The necessity to improve the existing technology of pulp deresination, in particular, to reduce the surfactants consumption and decrease the environmental load, led to a combination of existing methods of resin removal with the use of enzymatic treatment. The basis of the pulp deresination mechanism by amphiphilic compounds is the solubilization of resinous substances. Thus, the establishment of the patterns of this process and its control predetermines the success of implementation of the selected technology. The features of solubilization of triolein and rosin in the lipase-based systems of individual nonionic surfactants, the enzyme, as well as their synergistic mixtures with the determination of solubilization capacities of micelles and the possible mechanism of solubilizate incorporation into them were studied using spectrophotometry, pH measurement and dynamic light scattering. It was found that synthamide-5 has a low deresination capability in spite of the high solubilization capacity of its micelles and the production of aggregates with a hydrodynamic radius up to 98 nm after diffusion of rosin into them. It is likely that compact micellar structures with a developed surface, which are implemented in mixed systems of amphiphilic compounds, including the presence of synthamide-5 in them, are more preferable for successful deresination of pulp semi-finished products. The addition of lipase leads to an increased solubilization capacity of mixed aggregates and an increase in the intensity of solubilizate molecules incorporation. Thus, depending on the nature of the amphiphilic compound, there is a different mechanism for solubilizate incorporation into micelles. Determination of the size of associates in mixed systems showed the absence of enzyme denaturation, which predicts the successful application of such cooperative systems for deresination of fiber semi-finished products. It is found that the solubilizing capability of the studied systems on resin modeling objects correlates with their deresination capability with respect to different fiber semi-finished products.
For citation: Smit R.A., Demiantseva E.Yu., Andranovich O.S., Filippov A.P. Features of Solubilizing Effect of Amphiphilic Compounds during Pulp Deresination. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 1, pp. 180–191. DOI: 10.37482/0536-1036-2021-1-180-191
Acknowledgements: The authors are grateful to V.V. Zakharov, leading engineer of Laboratory No. 5 of the Institute of Macromolecular Compounds of the Russian Academy of Sciences (IMC RAS), for his assistance in the study of the enzyme preparation by electrophoresis in polyacrylamide gel.
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