The purified SLMPs-1-1 or SLMPs-2-1 were mixed with spectroscopic-grade KBr powder (Sigma Aldrich Co., United States), ground, and then pressed into 1 mm pellets for spectral measurement in the frequency range of 4000–400 cm–1 using a Nicolet 6700 FT-IR spectrometer (Thermo Co., United States) (22).
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