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Acid-induced gelation behavior of sonicated casein solutions
Authors:Ashkan Madadlou   Zahra Emam-Djomeh   Mohamad E. Mousavi   Mohamadamin Mohamadifar  Mohamadreza Ehsani
Affiliation:aDepartment of Food Science and Engineering, Faculty of Biosystem Engineering, Campus of Agriculture and Natural Resources, University of Tehran, Karaj, Iran;bDepartment of Food Science and Technology, Faculty of Nutrition and Food Science, Shahid Beheshti Medical University, Tehran, Iran
Abstract:
Casein gels were made from solutions sonicated by 24 and 130 kHz ultrasounds for 0, 60 and 120 min, followed by acidification with glucono-δ-lactone at 30 °C. The dynamics of gel formation were studied using rheological methods and microstructure of gels was monitored using scanning electron microscopy. Sonication postponed the gelation point to a lower pH value and increased the elasticity of freshly formed gels. It also resulted in gels with a more interconnected structure and smaller non-distinguishable particulates. This structure was especially dominant for the gel made from the solution already sonicated for 120 min.
Keywords:Acid-induced gelation   Ultrasound   Microstructure   Rheology
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