TY - JOUR
T1 - Silver/dendrimer nanocomposites as biomarkers
T2 - Fabrication, characterization, in vitro toxicity, and intracellular detection
AU - Lesniak, Wojciech
AU - Blelinska, Anna U.
AU - Sun, Kai
AU - Janczak, Katarzyna W.
AU - Shi, Xlangyang
AU - Baker, James R.
AU - Balogh, Lajos P.
PY - 2005/11
Y1 - 2005/11
N2 - We have synthesized water-soluble, biocompatible, fluorescent, and stable silver/dendrimer nanocomposites that exhibit a potential for in vitro cell labeling. Amino-, hydroxyl-, and carboxyl-terminated ethytenediamine core generation 5 poly(amldoamine) dendrimers were utilized to prepare aqueous sllver(l)-dendrimer complexes (with the molar ratio of 25 Ag + per dendrimer) at the biologic pH of 7.4. Conversion of silver(l)-dendrimer complexes into dendrimer nanocomposites was achieved by irradiating the solutions with UV light to reduce the bound Ag + cations to zerovalent Ag 0 atoms, which were simultaneously trapped in the dendrlmer network, resulting in the formation of {(Ag 0) 25-PAMAM_E5. NH 2}, {(Ag 0) 25-PAMAM_E5.NGly}, and {(Ag 0) 25-PAMAM_E5.NSAH} dendrimer nanocomposites (DNC), respectively. The silver-DNCs were characterized by means of UV-vis, fluorescence spectroscopy, dynamic light-scattering, zeta potential measurements, high-resolution transmission electron microscopy, X-ray energy dispersive spectroscopy, and selected area electron diffraction. The cytotoxicity of dendrimers and related silver nanocomposites was evaluated using an XTT colorimetric assay of cellular viability. The cellular uptake of nanoparticles was examined by transmission electron and confocal microscopy. Results indicate that {(Ag 0) 25-PAMAM_E5.NH2}, {(Ag 0-) 25-PAMAM_E5.NGly}, and {(Ag 0) 25-PAMAM_E5.NSAH} form primarily single particles with diameters between 3 and 7 nm. The dendrimer nanocomposites are fluorescent, and their surface charge, cellular internalization, toxicity, and cell labeling capabilities are determined by the surface functionalities of dendrlmer templates. The {(Ag 0-PAMAM_E5.NH 2} and {(Ag 0) 25-PAMAM_E5.NSAH} nanocomposites exhibit potential application as cell biomarkers.
AB - We have synthesized water-soluble, biocompatible, fluorescent, and stable silver/dendrimer nanocomposites that exhibit a potential for in vitro cell labeling. Amino-, hydroxyl-, and carboxyl-terminated ethytenediamine core generation 5 poly(amldoamine) dendrimers were utilized to prepare aqueous sllver(l)-dendrimer complexes (with the molar ratio of 25 Ag + per dendrimer) at the biologic pH of 7.4. Conversion of silver(l)-dendrimer complexes into dendrimer nanocomposites was achieved by irradiating the solutions with UV light to reduce the bound Ag + cations to zerovalent Ag 0 atoms, which were simultaneously trapped in the dendrlmer network, resulting in the formation of {(Ag 0) 25-PAMAM_E5. NH 2}, {(Ag 0) 25-PAMAM_E5.NGly}, and {(Ag 0) 25-PAMAM_E5.NSAH} dendrimer nanocomposites (DNC), respectively. The silver-DNCs were characterized by means of UV-vis, fluorescence spectroscopy, dynamic light-scattering, zeta potential measurements, high-resolution transmission electron microscopy, X-ray energy dispersive spectroscopy, and selected area electron diffraction. The cytotoxicity of dendrimers and related silver nanocomposites was evaluated using an XTT colorimetric assay of cellular viability. The cellular uptake of nanoparticles was examined by transmission electron and confocal microscopy. Results indicate that {(Ag 0) 25-PAMAM_E5.NH2}, {(Ag 0-) 25-PAMAM_E5.NGly}, and {(Ag 0) 25-PAMAM_E5.NSAH} form primarily single particles with diameters between 3 and 7 nm. The dendrimer nanocomposites are fluorescent, and their surface charge, cellular internalization, toxicity, and cell labeling capabilities are determined by the surface functionalities of dendrlmer templates. The {(Ag 0-PAMAM_E5.NH 2} and {(Ag 0) 25-PAMAM_E5.NSAH} nanocomposites exhibit potential application as cell biomarkers.
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U2 - 10.1021/nl051077u
DO - 10.1021/nl051077u
M3 - Article
C2 - 16277438
AN - SCOPUS:28144435341
SN - 1530-6984
VL - 5
SP - 2123
EP - 2130
JO - Nano Letters
JF - Nano Letters
IS - 11
ER -