IMBIV   05474
INSTITUTO MULTIDISCIPLINARIO DE BIOLOGIA VEGETAL
Unidad Ejecutora - UE
artículos
Título:
Macroporous beads modfication with Polyethyleneimines of diffrent molecular weight as Poly-cationic ligands
Autor/es:
NATALIA GONZALEZ; MIRIAM STRUMIA; CECILIA ALVAREZ I.
Revista:
JOURNAL OF APPLIED POLYMER SCIENCE
Editorial:
JOHN WILEY & SONS INC
Referencias:
Año: 2010 p. 2857 - 2865
ISSN:
0021-8995
Resumen:
Polyethylenimines (PEIs) with different molecular
weights [number-average molecular weights (Mn0s)Mn0s)
¼ 60,000, 1200, and 423] were coupled onto macroporous
beads. These rigid and spherical beads were prepared by
the crosslinking of 2-hydroxyethyl methacrylate and ethylene
glycol dimethacrylate. The PEI attachment was carried
out through epoxy groups yielded in a previous activation
step with epichlorohydrin on matrix hydroxyl groups. Different
initial concentrations of PEI were assayed. The supports
so obtained were characterized by several techniques
(Fourier transform infrared spectroscopy, scanning electron
microscopy, thermogravimetric analysis, and mercury
intrusion porosimetry). All of the PEI-containing beads
were used to analyze the influence that the molecular
weight, the shape of the polycationic ligand (PEI), and the
degree of coupling onto the matrices may have had on the
efficiency of the retention of the bovine serum albumin
protein used as a model biomolecule. In these assays, the
PEI-modified beads with Mn ¼ 60,000 showed better
results than those modified with PEIs with Mns of 1200
and 423. The presence of sparse and long chains of PEI
60,000 onto the matrix, by reason of their highest accessibility
toward the large protein, may have resulted in a better
disposition of functional groups, whereas more short
chains in the other PEIs60,000, 1200, and 423] were coupled onto macroporous
beads. These rigid and spherical beads were prepared by
the crosslinking of 2-hydroxyethyl methacrylate and ethylene
glycol dimethacrylate. The PEI attachment was carried
out through epoxy groups yielded in a previous activation
step with epichlorohydrin on matrix hydroxyl groups. Different
initial concentrations of PEI were assayed. The supports
so obtained were characterized by several techniques
(Fourier transform infrared spectroscopy, scanning electron
microscopy, thermogravimetric analysis, and mercury
intrusion porosimetry). All of the PEI-containing beads
were used to analyze the influence that the molecular
weight, the shape of the polycationic ligand (PEI), and the
degree of coupling onto the matrices may have had on the
efficiency of the retention of the bovine serum albumin
protein used as a model biomolecule. In these assays, the
PEI-modified beads with Mn ¼ 60,000 showed better
results than those modified with PEIs with Mns of 1200
and 423. The presence of sparse and long chains of PEI
60,000 onto the matrix, by reason of their highest accessibility
toward the large protein, may have resulted in a better
disposition of functional groups, whereas more short
chains in the other PEIsMn ¼ 60,000 showed better
results than those modified with PEIs with Mns of 1200
and 423. The presence of sparse and long chains of PEI
60,000 onto the matrix, by reason of their highest accessibility
toward the large protein, may have resulted in a better
disposition of functional groups, whereas more short
chains in the other PEIsMns of 1200
and 423. The presence of sparse and long chains of PEI
60,000 onto the matrix, by reason of their highest accessibility
toward the large protein, may have resulted in a better
disposition of functional groups, whereas more short
chains in the other PEIs