Study on preparation, physicochemical properties and <i>in vitro</i> digestion of casein sol/gel induced by citric acid and heat.

The reason may be that at acidic pH, RA solution was mainly composed of yellow salt cations with positive charge, and the increase of pH value caused its structure to be destroyed, further leading its charge to change from positive to negative, and the charge number showed a trend of decreasing first and then increasing ( Huang et al., 2023 ).

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