The chemical structure of TBS and OS-TBS was analyzed qualitatively using a Spectrum Two FT-IR spectrometer (PerkinElmer, Boston, MA, USA). Samples were prepared by grinding the finely powdered starch with KBr (1:100, w/w) and spectra were obtained from 400 to 4000 cm−1 at a resolution of 4 cm−1 [33 (link)].
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