Adsorption behaviour of cadmium on L-methionine immobilized on controlled pore glass

Functionalized mesoporous silica material and anionic dye adsorption: MCM-41 incorporated with amine groups for competitive adsorption of Acid Fuchsine and Acid Orange II

“…When the adsorption system is at a state of equilibrium, the distribution of anionic dyes between the liquid phase and adsorbent is obviously vital to establish, which can be generally expressed via one or more of a series of isotherm models. 2,55,56 For the present work, the adsorption isotherms used were the Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models, for describing the relationship between the amount of adsorbate adsorbed on adsorbents at equilibrium and the concentration of the remaining anionic dyes in aqueous solution at different temperatures.…”

Antioxidant capacities of fractionated barley hordein hydrolysates in relation to peptide structures

“…Obviously, the short peptides possess a greater negative charge density (charge‐to‐mass ratio) compared to large peptides, which provide more binding sites for metal ions. Amino acid analysis indicates that the smaller‐sized peptides (<1 kDa) have more positively charged residues (Arg, His, and Lys) in addition to higher content of Met and Thr, which may also contribute to ferrous ion chelating . In both medium‐ and small‐sized peptide fractions (5–10 and <1 kDa fractions), the more hydrophobic HPLC fractions (F3 and F4) exhibited stronger capacity to chelate ferrous ions.…”

Biosorption: A new rise for elemental solid phase extraction methods

“…This research group reported a retention capacity for Cd of 15.11 ± 2.58 mol g −1 on l-methionine-CPG system (l-met-CPG). The amino acid immobilization onto the solid support elapses through its amino group with the carboxyl and the functional group available to interact with metals [114]. Since protonation and deprotonation of carboxyl and functional groups play an important role in metal binding, pH becomes an important factor to optimize in the elemental retention by this class of sorbents.…”

“…Since protonation and deprotonation of carboxyl and functional groups play an important role in metal binding, pH becomes an important factor to optimize in the elemental retention by this class of sorbents. The higher elemental retention occurring at neutral or alkaline pH ranges [27][28][29][30][31]114] is correlated with the deprotonation of the carboxyl group at alkaline pH values and making possible the retention of different metals. In addition, at alkaline pH range (8.0-9.0), it was shown that the system lmethionine-CPG presents both stronger and weaker binding sites for Cd retention [114].…”