(Hydroxypropyl)methyl Cellulose-Chitosan Film as a Matrix for Lipase Immobilization—Part ΙΙ: Structural Studies

Vassiliadi, Evdokia; Tsirigotis-Maniecka, Marta; Symons, Henry E.; Gobbo, Pierangelo; Nallet, Frédéric; Xenakis, Aristotelis; Zoumpanioti, Maria

doi:10.3390/gels8090595

Cited by 2 publications

(1 citation statement)

References 36 publications

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“…They are similar in structure and have high compatibility. HPMC/CS thermosensitive hydrogels can be constructed by the formation of intermolecular hydrogen bonds between the hydrophilic moieties of the macromolecular, chains of HPMC (hydroxyl groups), CS (amine, amide, hydroxyl groups) and water [ 14 ]. Li [ 15 ] et al, Wang [ 16 ] et al and Hu [ 17 ] et al synthesized HPMC/CS hydrogels with outstanding thermosensitivity and minimal cytotoxicity through physical cross-linking.…”

Section: Introductionmentioning

confidence: 99%

Wettability of HPMC/PEG/CS Thermosensitive Porous Hydrogels

Ma,

Shi,

Zhang

et al. 2023

Gels

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Thermosensitive hydrogels have been receiving attention in the development of fire extinguishing agents due to their stimuli responsivity. Conventional hydrogels are limited by their slow response rate, and their wettability has not been studied systematically. In the present study, a concentrate of a thermosensitive porous system has been successfully synthesized by adding Na2CO3/CH3COOH as a foaming agent into the mixture of hydroxypropyl methylcellulose (HPMC)/polyethylene glycol (PEG)/chitosan (CS). The systems with different concentrations were obtained by diluting the concentrate with water. Thermosensitivity, surface tension and contact angle were characterized. In addition, spreadability, wettability and adhesivity were investigated systematically. Results showed that the systems with a concentration greater than 15 wt% exhibited outstanding performance of thermosensitivity and coagulability. A total of 20 wt% of the system has the best spreadability and wettability on the wood surface, most likely due to favorable contributions brought by both adequate viscosity and hydrophilicity. The adhesive force and surface-free energy of the pre-gel droplet that reached deposition on the wood surface decreased by 46.78% and 20.71%, respectively. The gel has a great capacity of water retention over a long period of time, which makes this porous gel the best system when it comes to its wettability and adhesiveness towards the chosen wood surface. The equilibrium surface tension decreased by 45.50% compared with water. HPMC/PEG/CS thermosensitive porous hydrogel with excellent wettability presented wide-ranging possibilities for the further development of fire suppression agents of fast phase-transition thermosensitive hydrogel.

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Section: Introductionmentioning

confidence: 99%

Wettability of HPMC/PEG/CS Thermosensitive Porous Hydrogels

Ma,

Shi,

Zhang

et al. 2023

Gels

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(Hydroxypropyl)methyl Cellulose-Chitosan Film as a Matrix for Lipase Immobilization—Part ΙΙ: Structural Studies

Vassiliadi

Tsirigotis-Maniecka

Symons

et al. 2022

Gels

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The present work reports on the structural study of a film made of a hybrid blend of biopolymers used as an enzyme carrier. A cellulose derivative (HPMC) and chitosan (CS) were combined in order to formulate a film on which Mucor miehei lipase was immobilized. The film was successfully used as a biocatalyst; however, little is known about the structure of the system. Therefore, small-angle X-ray scattering, Fourier transform infrared spectroscopy (FTIR), optical microscopy, and scanning electron microscopy (SEM), as well as microindentation measurements, were used to shed light on the structure of the promising biocatalyst. Among the results, intermolecular hydrogen bonds were observed between the amide groups of the two polymers and the lipase. The presence of the enzyme does not seem to affect the mechanical properties of the matrix. The used film after 35 cycles of reaction seemed to be fatigued and had lost part of its humidity, explaining the reduction of the enzyme activity.

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(Hydroxypropyl)methyl Cellulose-Chitosan Film as a Matrix for Lipase Immobilization—Part ΙΙ: Structural Studies

Cited by 2 publications

References 36 publications

Wettability of HPMC/PEG/CS Thermosensitive Porous Hydrogels

Wettability of HPMC/PEG/CS Thermosensitive Porous Hydrogels

(Hydroxypropyl)methyl Cellulose-Chitosan Film as a Matrix for Lipase Immobilization—Part ΙΙ: Structural Studies

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