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https://hdl.handle.net/1822/56418
Título: | Structural and mechanical properties of organogels: Role of oil and gelator molecular structure |
Autor(es): | Cerqueira, Miguel Ângelo Parente Ribeiro Fasolin, Luiz H. Picone, Carolina S. F. Pastrana, Lorenzo M. Cunha, Rosiane L. Vicente, A. A. |
Palavras-chave: | Gels Oleogels Organogels Organogelator Crystallization Surfactant |
Data: | Jun-2017 |
Editora: | Elsevier 1 |
Revista: | Food Research International |
Citação: | Cerqueira, Miguel A.; Fasolin, Luiz H.; Picone, Carolina S. F.; Pastrana, Lorenzo M.; Cunha, Rosiane L.; Vicente, António A., Structural and mechanical properties of organogels: Role of oil and gelator molecular structure. Food Research International, 96, 161-170, 2017 |
Resumo(s): | This work aims at evaluating the influence of oil and gelator structure on organogels' properties through rheological measurements, polarized microscopy and small-angle X-ray scattering (SAXS). Four different food-grade gelators (glyceryl tristearate GT; sorbitan tristearate ST; sorbitan monostearate SM and glyceryl monostearate - GM) were tested in medium-chain triglyceride and high oleic sunflower (MCT and LCT, respectively) oil phases. Organogels were prepared by mixing the oil phase and gelator at different concentrations (5, 10, 15, 20 and 25%) at 80 °C during 30 min. All organogels presented birefringence confirming the formation of a crystalline structure that changed with the increase of the gelator concentration. Through the evaluation of SAXS peaks it has been confirmed that all structures were organized as lamellas but with different d-spacing values. These particularities at micro- and nanoscale level lead to differences in rheological properties of organogels. Results showed that the oil type (i.e. medium- and long-chain triglyceride) and hydrophilic head of gelators (i.e. sorbitan versus glyceryl) exert influence on the organogels physical properties, but the presence of monostearate leads to the formation of stronger organogels. Moreover, gels produced with LCT were stronger and gelled at lower organogelator concentration than MCT. |
Tipo: | Artigo |
Descrição: | Supplementary data to this article can be found online at http://dx.doi.org/10.1016/j.foodres.2017.03.021. |
URI: | https://hdl.handle.net/1822/56418 |
DOI: | 10.1016/j.foodres.2017.03.021 |
ISSN: | 0963-9969 |
Versão da editora: | http://www.journals.elsevier.com/food-research-international/ |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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document_46723_1.pdf | 2,92 MB | Adobe PDF | Ver/Abrir |