Aqueous mixtures of cornstarch and Pluronic® F127 studied by experimental and computational techniques

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dc.contributor.authorBaldassa, Monize A.B. [UNESP]
dc.contributor.authorDias, Raphael V.R. [UNESP]
dc.contributor.authorOliveira, Leandro C. [UNESP]
dc.contributor.authorFeitosa, Eloi
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionFederal Technological University of Paraná (UTFPR)
dc.date.accessioned2023-03-01T20:55:14Z
dc.date.available2023-03-01T20:55:14Z
dc.date.issued2022-08-01
dc.description.abstractThe possibility of interaction between cornstarch (CS) and amphiphilic molecules, such as the micelle-forming triblock copolymer Pluronic® F127 (F127), also known by Poloxamer 407, indicates that CS-F127 aqueous mixtures can regulate either the starch solubility or the copolymer micellization. Herein experimental and computational techniques were used to investigate CS-F127 aqueous mixtures aiming to highlight the role of these compounds on the molecular complexation. Dynamic light scattering results show that CS in water is highly polydisperse, while the F127 concentration and temperature influence the micellization process and the interaction with CS. Circular dichroism data of CS supernatants indicate the existence of small helical-like granules (Dh ≈ 800 nm) in the CS-F127 mixed aqueous solutions at 25 °C. UV–Vis spectrophotometry shows a small absorption band around 267 or 275 nm characteristic of micelles, granules, or molecular complexes, while FTIR and X-ray diffractometry indicate negligible structural changes. Lugol iodine tests at 25 °C show that both the precipitate and supernatant in the mixtures undergo some structural changes also indicating molecular complexation. Molecular dynamic simulations show the formation of stabilized inclusion complexes (V-amylose), where the propylene oxide segment of the copolymer inside the amylose helix and the ethylene oxide branches facing the aqueous media. These results together reveal weak CS-F127 interactions, evidencing a small solubility of CS both in the absence and presence of F127 as a solubilizing agent. Furthermore, moderate CS amounts do not change the F127 micelle structure.en
dc.description.affiliationDepartment of Physics Institute of Biosciences Humanities and Exact Sciences São Paulo State University “Júlio de Mesquita Filho” (UNESP), São José do Rio Preto
dc.description.affiliationAcademic Department of Chemistry and Biology Federal Technological University of Paraná (UTFPR)
dc.description.affiliationUnespDepartment of Physics Institute of Biosciences Humanities and Exact Sciences São Paulo State University “Júlio de Mesquita Filho” (UNESP), São José do Rio Preto
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 2016/08753–6
dc.identifierhttp://dx.doi.org/10.1016/j.foodres.2022.111515
dc.identifier.citationFood Research International, v. 158.
dc.identifier.doi10.1016/j.foodres.2022.111515
dc.identifier.issn1873-7145
dc.identifier.issn0963-9969
dc.identifier.scopus2-s2.0-85133606959
dc.identifier.urihttp://hdl.handle.net/11449/241288
dc.language.isoeng
dc.relation.ispartofFood Research International
dc.sourceScopus
dc.subjectCornstarch
dc.subjectInclusion complex
dc.subjectPluronic F127
dc.subjectStarch solubility
dc.titleAqueous mixtures of cornstarch and Pluronic® F127 studied by experimental and computational techniquesen
dc.typeArtigo

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