Desalting of neutral amino acids fermentative solutions by electrodialysis with ion-exchange membranes

Electrodialytic desalting of model concentrated NaCl brines as such or enriched with a non-electrolyte osmotic component

“…The first category includes the mother liquors resulting from the separation of a number of fermentation broths rich in amino acids, such as D-˛-p-hydroxy-phenylglycine [6], lysine [7,8], DLphenylalanine [9,10], proline, valine and alanine [11]. In this case, the use of ED generally results in higher amino acid yields and lower wastewater treatment costs provided that the pH of the feed is adjusted to the isoelectric point of the amino acid of concern.…”

Transport properties of amino acid ions at isoelectric point in electrodialysis

“…For the five-compartment assemblies ( Fig. 1b), apart from ERS, the stack configuration was composed of two separate loops: D (2, 4) and C (1,3,5); namely the flowing streams circulating in diluted compartments 2 and 4 (D (2, 4)) and concentrated compartments 1, 3 and 5 (C (1, 3, 5)). The initial composition of the streams is given in Table 1b.…”

“…The electrodialysis technologies (ED), such as conventional electrodialysis (CED) [2,3], electrometathesis (EMT) [4], electro-ion substitution (EIS) [5], electrodialysis with bipolar membranes (BMED) [6] and electrodeionization (EDI) [4,7], have been proved their advance in the fields of amino acid production. According to their application, the two most important functions of ionexchange membrane separation processes are demineralization and concentration of amino acids [8].…”

Mixed matrix membranes for process intensification in electrodialysis of amino acids

“…Electro‐membrane processes have been successfully applied for the isolation of amino acids and peptides with different charge behavior with respect to pH . For example, electro‐membrane filtration, a technology that combines conventional membrane filtration with electrophoresis was developed and applied for the separation of bioactive peptides .…”