Spectroscopic Evaluation of Effects of Heat Treatments on the Structures and Emulsifying Properties of Caseins |
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| Authors: | ZHANG Hao WANG Peng-jie LEI Xin-gen YANG Hong-ju ZHANG Lu-da REN Fa-zheng ZHENG Li-min |
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| Affiliation: | 1. College of Information and Electrical Engineering, China Agricultural University, Beijing 100094, China 2. Laboratory of Functional Dairy, China Agricultural University, Beijing 100094，China3. Cornel University, NY 14456, USA4. Quality Control and Inspection Center for Domestically Animal Products, Ministry of Agriculture, Beijing 100094, China |
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| Abstract: | The effects of heat treatment (heating temperature and pH) on the structures and emulsifying properties of caseins were systematically studied by spectroscopy. Heat treatment from 60 to 100 ℃ resulted in an increase in their fluorescence intensity, hydrodynamic diameter, turbidity and emulsifying activity index, but decreased the size polydispersity of caseins. In the pH range of 5.5 to 7.0, the fluorescence intensity, hydrodynamic diameter, turbidity and emulsifying properties decreased with increased heating pH, but the size polydispersity of caseins increased with increased pH. The relationship between the surface fluorescence intensity and emulsifying activity was also investigated, revealing a correlation coefficient of 0.90. These results suggested that heat treatment could be used to modify the structures and emulsifying properties of caseins by appropriately selecting heating conditions. |
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| Keywords: | Caseins Heat treatment Structures Emulsifying properties Fluorescence spectrometry Dynamic light scattering Turbidity |
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