Fig. 3A presents the FT-IR spectra of native and citrate starch samples. Compared with native starch, a new peak at 1724 cm−1 was appeared in all citrate starch samples. This new absorption peak can be attributed to the characteristic ester group from citric acid in the structure of citrate starch. The band of 1724 cm−1 was associated with the stretching vibration of Cdouble bond; length as m-dashO bond from the acetyl group (Chatel, Voirin, & Artaud, 1997). The peak signal was weak in the citrate starch samples with DS of 0.058, however, with the increase in DS, the intensity became stronger, which was in agreement with the contents of SDS and RS in the starch samples.
Fig. 3A presents the FT-IR spectra of native and citrate starch samples. Compared with native starch, a new peak at 1724 cm−1 was appeared in all citrate starch samples. This new absorption peak can be attributed to the characteristic ester group from citric acid in the structure of citrate starch. The band of 1724 cm−1 was associated with the stretching vibration of Cdouble bond; length as m-dashO bond from the acetyl group (Chatel, Voirin, & Artaud, 1997). The peak signal was weak in the citrate starch samples with DS of 0.058, however, with the increase in DS, the intensity became stronger, which was in agreement with the contents of SDS and RS in the starch samples.
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