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Morphological, rheological and thermal characteristics of biopolymeric microcapsules loaded with plant stimulants

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Abstract

Morphological, rheological, and thermal properties of biopolymeric microcapsules loaded with novel plant growth regulators (2,3-dehydroaspartic acid dimethyl ester (PGR1), Z-isomer of the potassium salt of 2-amino-3-methoxycarbonylacrylic acid (PGR2) and 1-methyl-3-methylamino-maleimide (PGR3)) were studied. Microcapsule formulations containing PGR2 or PGR3 had a granular surface structure with substructures, whereas those containing PGR1 had smooth surfaces with no grain substructures. All formulations had storage moduli (G ′) greater than loss moduli (G ′′), indicating viscoelastic solid behavior. The application of angular frequency over the range tested did not significantly change G’ and G’’ values indicating well-ordered structures for all samples. Compared to other formulations, the highest values of storage modulus, yield strength and flow point obtained for formulations with PGR3 indicated an advantage in terms of stability in various physical environments. Thermal analysis showed good thermal stability of all formulations and is consistent with rheological properties confirming well-ordered structures. Encapsulated PGRs affect the intensity of intermolecular forces (electrostatic interaction and hydrogen bonds), thus changing the crosslinking density of the alginate network and the basic physicochemical properties of the formulations.

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Acknowledgements

The authors acknowledge the Ministry of Education and Sciences of the Republic of Kazakhstan for the support of project AP 05132810 “Scientific-practical bases of microencapsulation of bioactive substances and principally new stimulators of plant development with the purpose of agricultural production intensification” and CloudiFacturing Project — Grant Agreement number: 768892 — H2020-IND-CE-2016-17/H2020-FOF-2017.

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Authors and Affiliations

  1. Faculty of Agriculture, Department of Chemistry, University of Zagreb, Svetošimunska 25, Zagreb, Croatia

    Marko Vinceković, Slaven Jurić & Marijan Marijan

  2. Division of Physical Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia

    Suzana Šegota

  3. Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia

    Nataša Šijaković Vujičić

  4. Faculty of Forestry, University of Zagreb, Zagreb, Croatia

    Nikola Španić

  5. Biotechnology Department, M. Auezov South-Kazakhstan University, Shymkent, pr. Tauke Khan, Kazakhstan

    Botagoz Mutaliyeva

  6. Gagarina Av, UkrainianState University of Chemical Technology, Dnipro, Ukraine

    Alexander V. Prosyanik

Authors
  1. Marko Vinceković
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  2. Slaven Jurić
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  7. Alexander V. Prosyanik
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  8. Marijan Marijan
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Contributions

The corresponding author designed the research work and wrote the manuscript. Other authors carried out work under the guidance of the corresponding author. Conceptualization, M.V. and B.M.; Data curation, M.M., S.J. and A.V.P.; Formal analysis, S.J., M.M. and A.V.P.; Funding acquisition, B.M.; Investigation, N.Š., S.Š. N.Š.V., S.J. and M.M.; Methodology, M.V. and S.J.; Project administration, B.M.; Supervision, M.V.; Validation, M.V.; Visualization, M.V..; Writing—original draft, M.V.; Writing—review & editing, MV. and B.M. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Marko Vinceković.

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This manuscript describes original work and is not under consideration by any other journal. All authors approved the manuscript and this submission. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Vinceković, M., Jurić, S., Šegota, S. et al. Morphological, rheological and thermal characteristics of biopolymeric microcapsules loaded with plant stimulants. J Polym Res 29, 204 (2022). https://doi.org/10.1007/s10965-022-03057-8

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