Format

Send to:

Choose Destination
See comment in PubMed Commons below
ACS Appl Mater Interfaces. 2013 Feb;5(4):1190-6. doi: 10.1021/am302234z. Epub 2013 Feb 6.

Size-dependent stability of water-solubilized CdTe quantum dots and their uptake mechanism by live HeLa cells.

Author information

  • 1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, China.

Abstract

Water-solubilized quantum dots have led to a promising application in cellular labeling and biological imaging. The physicochemical properties of water-solubilized quantum dots, particularly in a physiological environment, are strongly dependent on their size. In this paper, we systematically studied the stability of mercaptosuccinic acid-coated CdTe quantum dots (MSA-QDs) of about 2.3 and 5.4 nm diameters in various buffers with different pH values and under laser irradiation by fluorescence spectroscopy. It was found that larger MSA-QDs showed better stability. Size-dependent uptake of MSA-QDs by living HeLa cells was further investigated by confocal microscopy. In phosphate buffer solution, the larger MSA-QDs entered the cells mainly by endocytosis, and part of the smaller ones entered the cells by passive penetration. In cell culture medium, their uptake pathways could be changed due to the changes of their surface properties. The cytotoxicity of smaller and larger MSA-QDs was significantly decreased due to the adsorption of some biological components in the cell culture medium on the nanoparticles surface.

PMID:
23387830
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for American Chemical Society
    Loading ...
    Write to the Help Desk