Effect of glycerol on the physicochemical properties of cereal starch films

Abstract

The physical properties of corn, wheat and rice starch edible films with different level of glycerol were evaluated. Starch films exhibited an apparent endothermic peak in the range of 151–199°C with corn starch film with 1.6% glycerol having a relatively lower T<sub>o</sub> and higher T<sub>p</sub>. X-ray diffraction spectroscopy indicated that the corn, wheat, rice starch powders had ~ 39–49% crystallinity, whereas Fourier transform infrared spectra showed peaks associated with the tightly bound water present in the rice, corn, wheat starches. Overall, glycerol addition could enhance the water vapour pressure barrier properties of the films, but their tensile strength was reduced. Corn starch films were identified as the most suitable choice for edible packaging as its thermal characteristics indicated suggested a more acceptable sealability. Rice starch films is proposed as the better choice for coating as it showed better flexibility as indicted by lower tensile and higher elongation properties.

Development and Evaluation of Alginate Membranes with Curcumin-Loaded Nanoparticles for Potential Wound-Healing Applications

“…DSC is a technique used to determine the quantity of heat either absorbed or released when substances undergo physical or chemical changes [39]. In Figure 4b, DSC thermograms of curcumin, CNp, M4 membrane as vehicle, and CNp‒M4 membrane are presented.…”

Developing thermoplastic corn starch composites filled with brewer's spent grain for applications in biodegradable films

“…This composition was chosen based on previous studies, [41] which resulted in homogeneous and flexible films. TPS/BSG composites (C) were prepared by adding different contents (1, 2.5, and 5 wt%) of BSG sifted with different sieves (35,60, and 100 mesh). The amount of deionized water was reduced in order to keep the final weight of the mixture at 100 g, as shown in Table 2.…”

“…The amount of deionized water was reduced in order to keep the final weight of the mixture at 100 g, as shown in Table 2. Composite samples were named according to the size of the sieve used (35,60, and 100 mesh) to prepare BSG and the content of BSG (1, 2.5, and 5 wt%) added to the composites.…”

“…The optical micrographs of the BSG fibers sifted in sieves of different sizes (35,60, and 100 mesh) and their size distribution are presented in Figure 3. It is possible to note that fibers with three different size ranges were efficiently obtained to produce TPS/BSG composites.…”

“…In this context, the purpose of this study was to develop films of thermoplastic corn starch filled with BSG. We explored the use of different contents (1-5 wt%) of BSG fibers with different sizes (35,60, and 100 mesh), aiming to identify the film compositions with the most promising mechanical and thermal properties. The composites developed in the present study are sustainable and consist of alternatives to conventional polymer materials based on fossil sources.…”