Starch in rubbery and glassy states by FTIR spectroscopy

Plasticizers effect on native biodegradable package materials

“…A similar situation is also mentioned for the 1000/1022 cm -1 ratio in the case of extruded starch and granular starch with water content under 20% [9].…”

“…According to Capron et al [9] the intense absorption from 998 cm -1 may be assigned to hydrated crystalline domains whereas the band at 1014 cm -1 or 1022 cm -1 reveals the amorphous contribution of plasticizers in starch samples.…”

“…In the papers [9][10][11]13] are given many correlations between changes in the some band intensities from the 1000 cm -1 region (994, 1000, 1022, 1040, 1047, 1053 cm -1 ) and the crystalline or amorphous phases (forms) of different starches materials.…”

“…The plasticizers molecule (water, glycerol) and other proceedings as annealing extrusion or enzymatic digestion can destabilize the crystalline regions and increase the amorphous domains [7,8]. The vibrational spectroscopic techniques, such as IR and Raman spectroscopy are successfully used in the structural investigation of many starch materials [9][10][11][12][13]. It is suggested that the change in the 1015-22/1000 bands ratio intensities may be related with amorphous / crystalline ratio in starch samples.…”

Characterization Methods for Starch-Based Materials: State of the Art and Perspectives

“…FTIR can be used to observe the relative height of peaks related to ordered and amorphous starch resulting in a measure of the samples' helical content; these peaks are at 1000 and 1022 cm À1 respectively. [112,113] However, the ratios of these peaks are quite sensitive to water content, as there is a large overlap between water peaks and the peaks of interest. [112,114] This makes the production of absolute values using FTIR quite difficult, as the positioning of the baseline for analysis is crucial.…”