Suitability of starch extracted from fresh pasta by-product in biodegradable film production

摘要

Starch (PS) isolated from fresh pasta by-product was plasticized with different amount of glycerol (10, 15, and 20%). X-ray diffraction highlighted that after PS plasticization, the obtained bio-films showed a partial change in the crystallinity and typical saccharide bands were put in evidence by peaks associated with C-C, C-O, C-H, and -OH stretching from the Fourier transform infrared spectroscopy spectra. The differential scanning calorimetry measurements demonstrated that glass transition temperature (T-g) of bio-films decreased with increasing glycerol content. In addition, their total soluble matter released in distilled water increased with increasing the glycerol content; and an increase in relative humidity and in plasticizer content resulted in the highest values of water uptake. The tensile properties revealed a significant decrease in both Young's modulus and tensile strength but an increase in elongation at break with increasing the glycerol content. The biodegradation tests proved that bio-films were more biodegradable than the extracted starch implying a strong connection between plasticizer and biodegradability. (c) 2018 American Institute of Chemical Engineers Environ Prog, 38: 527-533, 2019