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Effect of the concentration of DODMAC and 1‐decanol on the behavior of reverse micelles in the extraction of amino acids
Author(s) -
Wang W.,
Weber M. E.,
Vera J. H.
Publication year - 1995
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260460407
Subject(s) - micelle , extraction (chemistry) , chemistry , chromatography , amino acid , biophysics , food science , biochemistry , biology , organic chemistry , aqueous solution
The concentrations of dioctyldimethyl ammonium chloride (DODMAC) and 1‐decanol in isooctane needed to form reverse micelles by phase contact have been determined. The behavior of these reverse micelles in the extraction of aspartic acid, glutamic acid, and threonine was studied by analyzing all of the ionic species in the aqueous phase. The amino acid is extracted from the aqueous phase by exchanging with the Cl − counterions of DODMAC in the reverse micelles. The ionic species in the reverse micelles tend toward their undissociated states as the water uptake by the reverse micelles decreases. The effect of 1‐decanol on the extraction of the amino acids with two negative charges is due to the change in the water uptake of the reverse micelles. The concentration of DODMAC has no effect on the ion exchange of the amino acid with one negative charge with the Cl − counterions of DODMAC in the reverse micelles. Higher molar ratios of decanol to DODMAC favor the selective separation of amino acids with different charge numbers. © 1995 John Wiley & Sons, Inc.