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Transport properties and morphology of CHI / PSS multilayered microfiltration membranes for the low pressure filtration of amino acids
Author(s) -
Mathew Jissy,
Gopalakrishnan Akhil,
Aravindakumar Charuvila T,
Aravind Usha K
Publication year - 2017
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5067
Subject(s) - membrane , amino acid , microfiltration , bilayer , chemistry , polystyrene sulfonate , lysine , chromatography , filtration (mathematics) , glycine , permeation , organic chemistry , biochemistry , polymer , statistics , mathematics , pedot:pss
Abstract BACKGROUND As amino acids provide a green feedstock for the synthesis of chemicals, their isolation through low energy route sounds encouraging. RESULTS The changes in the permeation characteristics of microfiltration ( MF ) membranes with the deposition of a few bilayers of chitosan ( CHI ) and polystyrene sulfonate ( PSS ) for the low pressure filtration (∼0.69 bar) of selected amino acids glycine, histidine, lysine and aspartic acid is reported here. Glycine, with minimal electrostatic interaction with the multilayer film, is almost completely transmitted. Among the basic amino acids, lysine was isolated to a larger extent at both pI ( pH 9.5, 7 bilayer, 67.8%) and below pI ( pH 5, 7 bilayer, 96.4%). Aspartic acid was also isolated at both feed pHs ( pH 5, 93.6%). Donnan effects operate in a different manner in both cases. At pH 5, lysine is adsorbed to the membrane as counter ions, whereas aspartic acid is excluded as co‐ion from the film. The morphological features of membranes are illustrated through histogram, skewness, and Minkowski measures using AFM . CONCLUSIONS The present study brings forward the possibility of cutting down the filtration pressure to a lower value for the isolation of small molecules like amino acids by water based coating of a few bilayers on MF membranes. © 2016 Society of Chemical Industry