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(A) Attenuated total reflection– Fourier transform infrared spectroscopy (ATR–FTIR) spectra of native (a) and modified waxy potato starch (WPS) with 4% sodium hexametaphosphate (SHMP) (b), 6% SHMP (c), and 8% SHMP (d), (B) ATR–FTIR spectra of native (a) and modified WPS with 4% vinyl acetate (VAC) (e), 6% VAC (f), and 8% VAC (g).
