Thermoresponsive hydrogels from alginate-based graft copolymers

Lencina, M.M. Soledad; Iatridi, Zacharoula; Villar, Marcelo A.; Tsitsilianis, Constantinos

doi:10.1016/j.eurpolymj.2014.09.011

Cited by 79 publications

(40 citation statements)

References 45 publications

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“…The rheological properties of the samples were investigated by monitoring the storage modulus (G') and loss modulus (G") as a function of temperature (Figure 8). The G" values were obviously larger than the corresponding G' values within the temperature range of 25-40 • C (Figure 8a), showing typical liquid viscosity behavior, and the storage and loss moduli gradually decreased with the temperature for the SA formulation, which exhibited Arrhenius behavior [57]. Figure 8b indicates that there were two processes involved in the change of the G' and G" of PNIPAAm as the temperature increased.…”

Section: Rheological Propertiesmentioning

confidence: 90%

Thermosensitive Hydrogel for Encapsulation and Controlled Release of Biocontrol Agents to Prevent Peanut Aflatoxin Contamination

et al. 2020

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Starch, alginate, and poly(N-isopropylacrylamide) (PNIPAAm) were combined to prepare a semi-interpenetrating network (IPN) hydrogel with temperature sensitivity. Calcium chloride was used as cross-linking agent, the non-toxigenic Aspergillus flavus spores were successfully encapsulated as biocontrol agents by the method of ionic gelation. Characterization of the hydrogel was performed by Fourier-transform infrared spectroscopy (FTIR), scanning electron micrograph (SEM), and thermogravimetry analysis (TGA). Formulation characteristics, such as entrapment efficiency, beads size, swelling behavior, and rheological properties were evaluated. The optical and rheological measurements indicated that the lower critical solution temperature (LCST) of the samples was about 29–30 °C. TGA results demonstrated that the addition of kaolin could improve the thermal stability of the semi-IPN hydrogel. Morphological analysis showed a porous honeycomb structure on the surface of the beads. According to the release properties of the beads, the semi-IPN hydrogel beads containing kaolin not only have the effect of slow release before peanut flowering, but they also can rapidly release biocontrol agents after flowering begins. The early flowering stage of the peanut is the critical moment to apply biocontrol agents. Temperature-sensitive hydrogel beads containing kaolin could be considered as carriers of biocontrol agents for the control of aflatoxin in peanuts.

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Section: Rheological Propertiesmentioning

confidence: 90%

Thermosensitive Hydrogel for Encapsulation and Controlled Release of Biocontrol Agents to Prevent Peanut Aflatoxin Contamination

et al. 2020

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“…Thus, a brush-type anionic polyelectrolyte was synthesized with Mn= 4200 g/mol PNIPAAm side chains. The synthesis and further characterization were extensively described in a previous work [47]. The mean molecular weight of the co-polymer was determined by static light scattering giving a value of Mw = 89.5 KDa.…”

Section: Methodsmentioning

confidence: 99%

Effect of surfactant concentration on the responsiveness of a thermoresponsive copolymer/surfactant mixture with potential application on “Smart” foams formulations

Lencina

Miconi

Fernández-Leyes

et al. 2018

Journal of Colloid and Interface Science

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The Cop-L/DTAB mixtures were capable of producing thermoresponsive foams but only in a very narrow surfactant concentration (c) range, 0.3 < c< 1.6 mM. The responsiveness is due to a modification of the interfacial compression elasticity induced by conformational changes of the Polyeletrolyte/surfactant aggregates at the interface. This is possible only for c < 1.6 because higher surfactant concentrations induce the polymer collapse at all temperatures, eliminating the thermal responsiveness.

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“…Alginate thermogram showed an important mass decrease, approximately 45%, in the temperature range between 200 • C and 300 • C, as a first thermal degradation step. Then, a second weight loss at around 590 • C (∼15%) was observed, and finally about 20% of the initial mass remained as a residue (Lencina, Iatridi, Villar, & Tsitsilianis, 2014). The fact that not all alginate initial weight was lost, could be related to the sodium content, as well as, to others inorganic compounds as a consequence of the extraction process from natural sources.…”

Section: Probes Processing Optimizingmentioning

confidence: 97%

“…Thus, typical signals at 1690 and 1413 cm −1 , attributed to asymmetric and symmetric stretching of alginate carboxyl groups (COO − ) were found. In addition, symmetric and asymmetric vibration bands of C O C of polysaccharide rings were observed in the 1200-1050 cm −1 range (Lencina et al, 2014). Alginate content increase led to a slight shift to higher wavenumbers of band located at 1411 cm −1 .…”

Section: Films Characterizationmentioning

confidence: 97%

Thermoplastic starch plasticized with alginate–glycerol mixtures: Melt-processing evaluation and film properties

López

Ninago

Lencina

et al. 2015

Carbohydrate Polymers

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Thermoresponsive hydrogels from alginate-based graft copolymers

Cited by 79 publications

References 45 publications

Thermosensitive Hydrogel for Encapsulation and Controlled Release of Biocontrol Agents to Prevent Peanut Aflatoxin Contamination

Thermosensitive Hydrogel for Encapsulation and Controlled Release of Biocontrol Agents to Prevent Peanut Aflatoxin Contamination

Effect of surfactant concentration on the responsiveness of a thermoresponsive copolymer/surfactant mixture with potential application on “Smart” foams formulations

Thermoplastic starch plasticized with alginate–glycerol mixtures: Melt-processing evaluation and film properties

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