Determination of the rate control step of purin and pyrimidine bases adsorption on cobalt(II) - CDAE-sporopollenin
Küçük Resim Yok
Tarih
2003
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
ELSEVIER SCIENCE BV
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this work, adsorption kinetics of nucleic acid bases and nucleosides as ligands on cobalt(II)-carboxylated diaminoethyl sporopollenin (CDAE-sporopollenin) have been performed using continuous column runs. Adsorption rate measurements were carried out by using a-UV-Vis spectrophotometer, and rate control step of the adsorption process was determined. The adsorption of nucleic acid bases and nucleosides from solutions of different initial concentrations onto resin was measured as a function of time at 25degreesC. The results show that type of ligand has a great effect on ligand adsorption behaviour. External ligand concentrations play a significant role on adsorption rate of nucleic acid bases. The homogeneous diffusion model (HDM) is applied to the experimental breakthrough data. In all of the concentration range of adenine and uracil (nucleic acid bases), the graphs of -ln[l - U(alpha)] versus t were a straight line, which suggests that fractional attainment of equilibrium adsorption under film diffusion control is observed. On the contrary, adenosine and uridin (nucleosides), the graphs were not a straight line and have underwent adsorption under particle diffusion control. (C) 2003 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
rate control step, breakthrough curve, sporopollenin, nucleic acid bases, nucleosides
Kaynak
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
229
Sayı
45352
