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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Lecithin and phytosterols-based mixtures as hybrid structuring agents in different organic phases

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Okuro, Paula K. [1] ; Malfatti-Gasperini, Antonio A. [2] ; Vicente, Antonio A. [3] ; Cunha, Rosiane L. [1]
Total Authors: 4
[1] Univ Estadual Campinas, Sch Food Engn, Dept Food Engn, BR-13083862 Campinas, SP - Brazil
[2] CNPEM, Brazilian Synchrotron Light Lab, POB 6192, BR-13083970 Campinas, SP - Brazil
[3] Univ Minho, Ctr Biol Engn, Campus Gualtar, P-4710057 Braga - Portugal
Total Affiliations: 3
Document type: Journal article
Source: Food Research International; v. 111, p. 168-177, SEP 2018.
Web of Science Citations: 5

In this study the effect of lecithin (L) addition and solvent quality in a well-established oleogel system formed by beta-sitosterol and gamma-oryzanol (BG) was investigated. Medium chain triglycerides (MCT) and sunflower oil (SFO) were used as triglycerides and hexadecane (HEX) as a model of linear hydrocarbon. Lecithin was proposed due to its natural and versatile properties, showing different functionalities such as emulsifier and co-oleogelator. A study based on hierarchical organization of structured oil was performed applying techniques for bulk, meso and nanoscale. Self-sustained structures could no longer be observed after 40 wt% of BG replacement by lecithin. Small-angle X-ray scattering showed that the formed nanostructures (building blocks) were dependent on type of solvent and BG:L ratio in the mixture of oleogelators. Differential scanning calorimetry showed that stability against temperature was improved decreasing the polarity of the oil, and a time-dependent self-assembly of hybrid systems was observed from thermal and Theological measurements. Microscopy images exhibited changes on typical fibril aggregation of BG as lecithin was added, which promoted to a certain extent the suppression of ribbons. Oscillatory shear and uniaxial compression measurements were influenced by BG:L ratio and solvent mainly at higher lecithin amount. The combination of BG and MCT appeared to be the most affected by lecithin incorporation whereas SFO rendered harder oleogels. These results could contribute to understand the role of both lecithin and solvent type influencing the host oleogelator structure. It was hypothesized that intermolecular BG complex formation is hindered by lecithin, besides this phospholipid also might coexist as a different phase, causing structural changes in the gel network. Addressing the role of co-oleogelator it can provide the opportunity to tune soft materials with adjusted properties. (AU)

FAPESP's process: 06/03263-9 - Process, packaging, edible coatings application and final quality evaluation of some high moisture tropical fruits
Grantee:Miriam Dupas Hubinger
Support Opportunities: Regular Research Grants
Grantee:Paula Kiyomi Okuro
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 16/10277-8 - Formulation-depending parameters on the mechanical,thermal and rheological properties of lecithin-based oleogels
Grantee:Paula Kiyomi Okuro
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 11/06083-0 - Emulsification by microchannels
Grantee:Rosiane Lopes da Cunha
Support Opportunities: Regular Research Grants