Advertisement

If you have an ACS member number, please enter it here so we can link this account to your membership. (optional)

ACS values your privacy. By submitting your information, you are gaining access to C&EN and subscribing to our weekly newsletter. We use the information you provide to make your reading experience better, and we will never sell your data to third party members.

ENJOY UNLIMITED ACCES TO C&EN

Analytical Chemistry

Laser-Induced Shock Wave Chromatography

Proteins and quantum dots can be separated for analysis by the impact induced by a laser shock wave

by Celia Henry Arnaud
March 14, 2011 | A version of this story appeared in Volume 89, Issue 11

Nanometer-scale particles can be separated for analysis by the impact induced by a laser shock wave, Japanese researchers report (Anal. Chem., DOI: 10.1021/ac103349z). Tetsuhiko Nagahara, Nobuyuki Ichinose, and Shinpei Nakamura of Kyoto Institute of Technology use a focused laser pulse to initiate a shock wave in a water-filled capillary. As the scheme below shows, the shock wave propagates along the length of the capillary, sweeping nanoparticles such as proteins or quantum dots along with it. By collecting fluorescence images of the capillary before and after a laser pulse, the researchers obtain a difference image that reveals how far the particles travel. The distance depends on the size and molecular weight of the particles, with larger ones traveling farther. The Kyoto team constructed a linear calibration that works for proteins up to about 300 kilodaltons. The researchers were able to separate dimers of ovalbumin and bovine serum albumin from their respective monomers. They also used shock wave chromatography to separate a mixture of two sizes of CdSe quantum dots.

[+]Enlarge
Credit: Adapted from Anal. Chem.
Credit: Adapted from Anal. Chem.

Article:

This article has been sent to the following recipient:

0 /1 FREE ARTICLES LEFT THIS MONTH Remaining
Chemistry matters. Join us to get the news you need.