期刊
COLLOIDS AND SURFACES B-BIOINTERFACES
卷 80, 期 1, 页码 18-25出版社
ELSEVIER
DOI: 10.1016/j.colsurfb.2010.05.023
关键词
Polyamidoamine; Multi-walled carbon nanotubes; Biocompatible hybrids; Cytotoxicity; Biomolecule-immobilization ability
资金
- National Natural Science Foundation of China [20705008, 20675029, 20875029, 20905025, 20675030]
- Hunan Provincial Natural Science Foundation of China [09JJ6026]
- Program for Excellent Talents in Hunan Normal University [080642]
- Hunan Provincial Education Department [06B056]
- Hunan Normal University [060602]
Polyamidoamine (PAMAM) dendrimers were covalently tethered onto the surface of multi-walled carbon nanotubes (MWCNTs). The morphology and dispersive properties of the MWCNT-PAMAM hybrids were characterized and the peripheral functional groups were identified. Cytotoxicity to human osteosarcoma MG-63 cells, and protein and DNA immobilization ability of the hybrids were evaluated in detail. The dendrimers were present on the surface of MWCNTs in high density. The MWCNT-PAMAM hybrids exhibited good dispersibility and stability in aqueous solution. We showed that the hybrids are biocompatible, with no obvious cytotoxicity at concentration <25 mu g mL(-1) over 24h. They possess excellent biomolecule-immobilization ability (bovine serum albumin and 5'-Fam-CAAggTCgTgTAAAggTCAg-3' were used as models). The functionalization of MWCNTs with PAMAM dendrimers improved the biomolecule-immobilization ability 70-fold and simultaneously decreased the cellular toxicity by about 30%. It is expected that the MWCNT-PAMAM hybrids will find promising applications in biosensors and biomolecule delivery systems in gene or protein therapy. (c) 2010 Elsevier B.V. All rights reserved.
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