Fig. 1

FTIR spectra in the range of 1180–1800 cm− 1 of native CvM (a), PkM (b), and VmM (c) and after pH adjustment to pH 4 (blue), 5 (red) and 6 (green).
FTIR spectra in the range of 1180–1800 cm− 1 of native CvM (a), PkM (b), and VmM (c) and after pH adjustment to pH 4 (blue), 5 (red) and 6 (green).