The effects of intermolecular interactions on the physical properties of organogels in edible oils

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• 作者：Francesca R. Lupi^a ; ^{francesca.lupi@unical.it" class="auth_mail" title="E-mail the corresponding author} ; Valeria Greco^a ; ^{valeria.greco@unical.it" class="auth_mail" title="E-mail the corresponding author} ; Noemi Baldino^a ; ^{noemi.baldino@unical.it" class="auth_mail" title="E-mail the corresponding author} ; Bruno de Cindio^a ; ^{bruno.decindio@unical.it" class="auth_mail" title="E-mail the corresponding author} ; Peter Fischer^b ; ^{peter.fischer@hest.ethz.ch" class="auth_mail" title="E-mail the corresponding author} ; Domenico Gabriele^a ; ^{domenico.gabriele@unical.it" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Organogel ; Edible oils ; Monoglycerides of fatty acids ; Policosanol ; FT-IR ; DSC ; Van der Waals interactions ; Hydrogen bonding ; Rheology
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：1 December 2016
• 年：2016
• 卷：483
• 期：Complete
• 页码：154-164
• 全文大小：2125 K

文摘

The microstructure of organogels based on monoglycerides of fatty acids (MAGs) and policosanol and on different edible oils was investigated by using different techniques (calorimetry, nuclear magnetic resonance, infrared spectroscopy, rheology, polarized light microscopy) towards a better understanding and control of the oil gelation phenomena. Dynamic moduli were related via a fractal model to microstructural information such as solid content and fractal dimension. Infrared spectroscopy evidenced that network structure in MAGs gel is mainly due to hydrogen bonding, whereas in policosanol system is mainly given by van der Waals interactions. Because of the different relative contribution of molecular interactions, the investigated organogelators exhibit a distinguished macroscopic behavior. MAGs are sensitive to the utilized oil and structuration occurs quickly, even though at a temperature lower than policosanol. Policosanol organogels exhibit a behavior independent of the used oil and a slower gelation rate, as a result of the weaker van der Waals interactions. Nevertheless, at lower concentration a stronger final gel is obtained, probably due to of the large number of interactions arising among the long alkyl chains of the fatty alcohols. Obtained results evidenced that policosanol is very effective in gelation of different oils and seems promising for potential commercial uses.