NDLI: Effect of cationic polymer adsorbent pK a on the selective removal of endotoxin from an albumin solution

Content Provider	Springer Nature Link
Author	Sakata, M. Todokoro, M. Kai, T. Kunitake, M. Hirayama, C.
Copyright Year	2001
Abstract	To obtain fundamental information about the surface-environment effect of adsorbent on the selective adsorption of endotoxin (lipopolysaccharide; LPS) from a protein solution, cross-linked poly(ε-lysine)(PL) and aminated poly(γ-methyll-glutamate) (PMLG-NH2) spherical adsorbents were prepared. The apparent pK a (pK a,app) of the PL and PMLG-NH2 adsorbents was adjusted by controlling the ratio of poly(ε-lysine), in cross-linking, and the amination conditions (time and ratio of diaminoethane in the particles), respectively. When adsorption of LPS and acidic protein, e.g. bovine serum albumin (BSA), by the particles was determined by a batchwise method at pH 7.0 and an ionic strength, μ, of 0.05, they were found to depend strongly on pK a,app but not necessarily on the amino-group content. When pK a,app was increased from 6.8 to 8.2, the LPS-adsorbing capacity was increased from 1.0 to 2.7 mg mL−1 wet adsorbent and the apparent dissociation constant for adsorbent and LPS decreased from 3.7×10−10 to 1.0×10−10 m. Although PMLG-NH2 with the highest pK a,app, 8.2, had the highest LPS-adsorbing activity, it also adsorbed BSA. The BSA-adsorbing activity was sharply reduced when pK a,app was reduced to 6.8 or lower. As a result, the cross-linked PL adsorbent of pK a,app 6.8 had the highest LPS selectivity. The adsorbent could reduce levels of natural LPS associated with acidic protein (ovalbumin or BSA) at pH 7.0 and μ=0.05. The residual LPS concentration in each sample was >100 pg mL−1, and recovery of the protein was >96%.
Starting Page	619
Ending Page	623
Page Count	5
File Format	PDF
ISSN	00095893
Journal	Chromatographia
Volume Number	53
Issue Number	11-12
e-ISSN	16121112
Language	English
Publisher	Vieweg Verlag
Publisher Date	2001-01-01
Publisher Place	Wiesbaden
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Column liquid chromatography Lipopolysaccharide Poly(ε-lysine) Poly(γ-methyll-glutamate) Bovine serum albumin Analytical Chemistry Organic Chemistry Pharmacy Biochemistry Plant Sciences Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Analytical Chemistry Biochemistry Clinical Biochemistry

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