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자료유형
학술저널
저자정보
저널정보
한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology 제17권 제9호
발행연도
2007.1
수록면
1,527 - 1,532 (6page)

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Lysine produced during microbial fermentation isusualy recovered by an ion-exchange process, in whichpH to les than 2.0 with sulfuric acid) and then fed to a cation-exchange column containing an exchanger that has a sulfonegroup with a weak counterion such as NH4+. Ammonia waterwith a pH above 11 is then supplied to the column to displacethe purified lysine from the column and allow its recovery. Toenhance the adsorption capacity and for a possible reductionin chemical consumption, monovalent lysine fed at pH 4 wasinvestigated in comparison with conventional divalent lysine70% on a mass basis using pH 4 feding compared with pH1.5 feeding. Lysine adsorbed at pH 4 started to elute earlierthan that adsorbed at pH 1.5 when ammonia water was usedas the eluant solution, and the extent of early elution becamemore notable at lower concentrations of amonia. Moreover,the elution of monovalent lysine fed at pH 4 displayed astifer front boundary and higher peak concentration. However,when the amonium concentration was greater than 2.0 N,complete saturation of the bed was delayed during adsorptionand the percent recovery yield from elution was lowered, bothdrawbacks that were considered inevitable features originatingfrom the increased adsorption of monovalent lysine.

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