Ion-induced effective control of morphologies of soy protein biocomposites

Soy-Protein-Based Nanofabrics for Highly Efficient and Multifunctional Air Filtration

“…For simplicity, the raw material, pristine SPI, can be viewed as a large particle held by numerous intermolecular interactions contributed by 18 types of amino acids in the protein chains. 27 Therefore, the denaturation process can destroy the built-in high-level structures (secondary, tertiary, and quaternary) of the large SPI particles and finally unfold the soy protein chains, as illustrated in Figure 1c. To study the effect of the denaturation process on the SPI morphology, scanning electron microscopy (SEM) and transmission electron microcopy (TEM) were utilized.…”

“…As illustrated in Figure a, pristine soy protein takes the form of microsize powders with a diameter of about 50 μm (see Figure b). It is well-known that natural proteins usually have four different levels of structure, , including primary, secondary, tertiary, and quaternary structures. For simplicity, the raw material, pristine SPI, can be viewed as a large particle held by numerous intermolecular interactions contributed by 18 types of amino acids in the protein chains .…”

Biomedical applications of soy protein: A brief overview

“…In this case, four different types of salts with diverse solubility in water and PEO were used: LiClO 4 , Li 2 CO 3 , NaClO 4 , and NaCl. According to the results, the size of SPI particles in SPI/PEO casted biocomposite films increased by the presence of salts, especially, by those salts which were more soluble in water (NaClO 4 and NaCl) owing to the higher number of ions available to interact with SPI . However, for the salts (LiClO 4 , NaClO 4 ) which were soluble in PEO, the degree of crystallinity of PEO structure decreased because of the higher degree of dissociation of these salts in PEO structure leading to a completely amorphous structure.…”

“…Eyler et al used different types of salts for altering intermolecular interaction between the amino and carboxyl groups of SPI to produce biocomposite films of SPI/poly ethylene oxide (PEO) with adjustable morphologies. In this case, four different types of salts with diverse solubility in water and PEO were used: LiClO 4 , Li 2 CO 3 , NaClO 4 , and NaCl.…”

“…However, for the salts (LiClO 4 , NaClO 4 ) which were soluble in PEO, the degree of crystallinity of PEO structure decreased because of the higher degree of dissociation of these salts in PEO structure leading to a completely amorphous structure. Furthermore, it was observed that the uniformity of the SPI/PEO/salt blended films increased by the presence of salts which were soluble in PEO . Li et al made modified soy protein isolate powder by dispersing it in a tetrahydrofuran, maleic anhydride and zinc acetate solution, stirred the dispersion at 60˚C for half an hour and then the solution was filtered and dried.…”