Chemical, antioxidant, functional and thermal properties of rice bran proteins after yeast and natural fermentations

The paper focuses on the chemical, antioxidant, functional and thermal properties of rice bran proteins after yeast, natural fermentations and unfermented rice bran. Protein content of yeast-fermented rice bran protein concentrate (YFRBPC), naturally fermented rice bran protein concentrate (NFRBPC) and unfermented rice protein concentrate (UFRBPC) were 72.50%, 68.92% and 65.73%, respectively, while ash content were 4.72%, 4.61% and 3.04%, respectively. The total amino acids of YFRBPC, NFRBPC and UFRBPC were 123.16, 118.45 and 99.39, respectively. DPPH radical inhibition of YFRBPC, NFRBPC and UFRBPC were 58.62%, 55.29% and 47.14%, respectively, while ferric reducing ability power were 0.73, 0.58 and 0.41 mmol TE per gram, respectively. The highest foam capacity of UFRBPC (57.56%), NFRBPC (64.15%) and YFRBPC (76.00%) was observed at pH 9.0. YFRBPC and NFRBPC were lighter in colour than UFRBPC. YFRBPC had higher denaturation temperature and enthalpy value than NFRBPC and UFRBPC. The β-sheets structures were more in YFRBPC and NFRBPC than UNFBPC

A comparative review of protein and starch characteristics and end-use quality of soft and hard wheat

Hardness of wheat endosperm is a physical property that depends on the genetic makeup of the grain and varies amongst different types/varieties. It is associated with proteins, particularly 14–15 kDa friabilins, which exist in higher amounts at the surface of starch in soft wheat grains while either absent or occur in smaller quantities on granules of hard wheat varieties. The storage proteins in hard wheat flours exhibit a higher proportion of polymeric proteins, β-sheets and β-turns. Soft wheat starches show lower crystallinity, amylose-lipid complex content and proportion of A-type granules (disk or lenticular-shaped granules with diameter >10 µm) while higher gelatinisation temperatures, swelling, breakdown susceptibility and retrogradation than hard wheat starches. Flours from hard and soft wheat also differ for processing and end-use quality based on differences in dough rheological properties, solvent retention capacities and particle size