Abstract
State diagrams of binary mixtures of 1-stearoyl glycerol (C18) with 1-myristoyl glycerol (C14), 1-palmitoyl glycerol (C16) or 1-monobehenin glycerol (C22) in vegetable and mineral oil were obtained using different molar fractions of the monoglycerides (MGs) kee** the MG concentration constant (8% wt/wt). We observed that, independent of the MG mixture (C18:C14, C18:C16, C18:C22) and the type of oil, the MGs developed a mixed Lα phase with a transition temperature practically independent of the C18 molar fraction. In contrast, the transition temperature for the sub-α phase showed a eutectic point that, for the same MG mixture, occurred in both oils at the same MG molar fraction. At the MG molar composition corresponding to the eutectic point, the difference in length between the aliphatic chains in the mixed lamella resulted in a sub-α phase with the least efficient chain packing compared to that developed by any other MG molar fraction. Independent of the MG mixture and the type of oil, the oleogels developed by cooling (80 °C to 5 °C) followed by 180 min at 5 °C achieved the highest elasticity (G’5 °C) at the MG molar fraction composition associated with the eutectic point. Tentatively the least efficient aliphatic chains packing developed by the sub-α phase at the eutectic point, favored the incorporation and retention of higher amounts of oil. Thus, for a particular MG binary mixture, the oleogels at the eutectic point had the highest G’5 °C in comparison with the G’5 °C of oleogels formulated at any other MG proportion.
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Acknowledgements
The present research was supported by Consejo Nacional de Ciencia y Tecnología (CONACYT) through the grant CB-280981-2018. M. E., Charó Alvarado greatly appreciates the scholarship provided by CONACYT to conclude her Ph.D. program.
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M. E., Charó-Alvarado is currently a Ph. D. student, and these results are part of her thesis research. She was closely involved in the DSC and rheology measurements. M. A. Charó-Alonso was involved in data collection and along with M. E., Charó-Alvarado established the experimental conditions. J. F. Toro-Vazquez conception and design of the study, project and research group leader, also acting as M. E., Charó Alvarado's thesis advisor. The first draft of the manuscript was written by J. F. Toro-Vazquez and all authors contributed and commented on further versions of the manuscript. All authors read and approved the final manuscript.
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Charó-Alvarado, M.E., Charó-Alonso, M.A. & Toro-Vazquez, J.F. State Diagrams of Binary Mixtures of Saturated Monoglycerides in Vegetable and Mineral Oil and their Impact in the Oleogels Rheology. Food Biophysics (2024). https://doi.org/10.1007/s11483-024-09847-5
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DOI: https://doi.org/10.1007/s11483-024-09847-5