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Gels

Title:		Alginate-Bentonite-Based Hydrogels Designed to Obtain Controlled-Release Formulations of Dodecyl Acetate
Author(s):		Flores-Cespedes F; Villafranca-Sanchez M; Fernandez-Perez M;
Address:		"Department of Chemistry and Physics, Research Centre CIAIMBITAL, University of Almeria, Agrifood Campus of International Excellence (ceiA3), Crta. Sacramento s/n, 04120 Almeria, Spain"
Journal Title:		Gels
Year:		2023
Volume:		20230506
Issue:		5
Page Number:		-
DOI:		10.3390/gels9050388
ISSN/ISBN:		2310-2861 (Electronic) 2310-2861 (Linking)
Abstract:		"Dodecyl acetate (DDA), a volatile compound present in insect sex pheromones, was incorporated into alginate-based granules to obtain controlled-release formulations (CRFs). In this research, not only was the effect of adding bentonite to the basic alginate-hydrogel formulation studied, but also that of the encapsulation efficiency on the release rate of DDA in laboratory and field experiments. DDA encapsulation efficiency increased as the alginate/bentonite ratio increased. From the preliminary volatilization experiments, a linear relationship was found between the DDA release percentage and the amount of bentonite present in the alginate CRFs. Laboratory kinetic volatilization experiments showed that the selected alginate-bentonite formulation (DDAB(75)A(10)) exhibited a prolonged DDA release profile. The value of the diffusional exponent obtained from the Ritger and Peppas model (n = 0.818) indicated that the release process follows a non-Fickian or anomalous transport mechanism. Field volatilization experiments showed a steady release of DDA over time from the alginate-based hydrogels tested. This result, together with those obtained from the laboratory release experiments, allowed the obtainment of a set of parameters to improve the preparation of alginate-based CRFs for the use of volatile biological molecules, such as DDA, in agricultural biological control programs"
Keywords:		alginate bentonite controlled release dodecyl acetate;
Notes:		"PubMed-not-MEDLINEFlores-Cespedes, Francisco Villafranca-Sanchez, Matilde Fernandez-Perez, Manuel eng Project UAL2020-RNM-B2071, co-financed by FEDER/University of Almeria/ Switzerland 2023/05/26 Gels. 2023 May 6; 9(5):388. doi: 10.3390/gels9050388"