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FTIR-ATR (Fourier transform infrared-attenuated total reflection) spectra of TO, CD native powders, and TO/CD freeze-dried powders. When present, the CD most intense band at around 1025 cm−1 was taken as reference signal for normalization of traces. Asterisks and circles indicate marker bands for TO and CD, respectively. The trend of their ratio in TO/CD freeze-dried powders is depicted in the histogram.
