Phosphoesterification of soybean and peanut proteins with sodium trimetaphosphate (STMP): Changes in structure to improve functionality for food applications.

Title Phosphoesterification of soybean and peanut proteins with sodium trimetaphosphate (STMP): Changes in structure to improve functionality for food applications.
Authors A. Sánchez-Reséndiz; S. Rodríguez-Barrientos; J. Rodríguez-Rodríguez; B. Barba-Dávila; S.O. Serna-Saldivar; C. Chuck-Hernández
Journal Food Chem
DOI 10.1016/j.foodchem.2018.04.009
Abstract

Soybean and peanut protein isolates underwent phosphorylation using sodium trimetaphosphate (STMP). Changes in functional properties and the influence of STMP (1, 2 or 3% w/w), pH (11.5 or 12.5), temperature (35 or 55?°C) and time (3 or 5?h) were evaluated. The highest degree of phosphorylation was achieved at 2% of STMP and pH 12.5. The best specific conditions varied according to the raw material: in soybean, 25% phosphorylation was achieved at 55?°C and 5?h whereas in peanut, 30% was reached at 35?°C and 3?h. The modified proteins showed an improved emulsifying activity (27.3% for soybean and 6.6% for peanut), whereas NSI for soybean increased more than three times and for peanut decreased by half. In vitro digestibility improved in both isolates around 1.5%. These results showed that phosphorylation with STMP of peanut and soybean proteins yielded isolates with a wide array of potential applications in food systems.

Citation A. Sánchez-Reséndiz; S. Rodríguez-Barrientos; J. Rodríguez-Rodríguez; B. Barba-Dávila; S.O. Serna-Saldivar; C. Chuck-Hernández.Phosphoesterification of soybean and peanut proteins with sodium trimetaphosphate (STMP): Changes in structure to improve functionality for food applications.. Food Chem. 2018;260:299305. doi:10.1016/j.foodchem.2018.04.009

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Sodium

Sodium Bohr ModelSee more Sodium products. Sodium (atomic symbol: Na, atomic number: 11) is a Block D, Group 5, Period 4 element with an atomic weight of 22.989769. The number of electrons in each of Sodium's shells is [2, 8, 1] and its electron configuration is [Ne] 3s1. The sodium atom has a radius of 185.8 pm and a Van der Waals radius of 227 pm. Sodium was discovered and first isolated by Sir Humphrey Davy in 1807. In its elemental form, sodium has a silvery-white metallic appearance. It is the sixth most abundant element, making up 2.6 % of the earth's crust. Sodium does not occur in nature as a free element and must be extracted from its compounds (e.g., feldspars, sodalite, and rock salt). The name Sodium is thought to come from the Arabic word suda, meaning "headache" (due to sodium carbonate's headache-alleviating properties), and its elemental symbol Na comes from natrium, its Latin name.

Phosphorus

Phosphorus Bohr ModelSee more Phosphorus products. Phosphorus (atomic symbol: P, atomic number: 15) is a Block P, Group 15, Period 3 element. The number of electrons in each of Phosphorus's shells is 2, 8, 5 and its electronic configuration is [Ne] 3s2 3p3. The phosphorus atom has a radius of 110.5.pm and its Van der Waals radius is 180.pm. Phosphorus is a highly-reactive non-metallic element (sometimes considered a metalloid) with two primary allotropes, white phosphorus and red phosphorus its black flaky appearance is similar to graphitic carbon. Compound forms of phosphorus include phosphates and phosphides. Phosphorous was first recognized as an element by Hennig Brand in 1669 its name (phosphorus mirabilis, or "bearer of light") was inspired from the brilliant glow emitted by its distillation.

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