This work aimed to improve β-Lg interfacial and foaming properties at pH 5. β-Lg was subjected to glycation followed by hydrolysis (GH) and vice versa (HG). GH and HG hardly changed the foaming capacity with respect to that of β-Lg at pH 7. GH improved the viscoelastic character of β-Lg interfacial films at pH 5. Improvement of β-Lg interfacial properties after GH led to highly stable foams at pH 5.