Quantum dots improve peptide detection in MALDI MS in a size dependent manner

Table 1 Properties of CdSe/ZnS Core/Shell "EviDots" quantum dots from http://www.evidenttech.com unless specified otherwise

QD	QD emission, nm^a	QD emission, nm^b	Emission FWHM, nm^a,c	Estimated crystal diameter, nm^a	Estimated molecular weight^d, g/mol	Approx. quantum yield^a, %
ED-C11-TOL-0520	515	517	< 35	2.1	10,000	30%-50%
ED-C11-TOL-0540	546	544	< 30	2.4	15,000	30%-50%
ED-C11-TOL-0560	561	566	< 30	2.6	23,000	30%-50%
ED-C11-TOL-0580	575	579	< 30	3.2	44,000	30%-50%
ED-C11-TOL-0600	596	598	< 30	4.0	86,000	30%-50%
ED-C11-TOL-0620	616	612	< 30	5.2, (5.05)^e	200,000	30%-50%

^aas specified by the manufacturer
^bmeasured experimentally, using 1:100 - 1:2000 dilutions in toluene, and Perkin Elmer LS50B spectrofluorimeter (380 nm excitation wavelength).
^cfull width at half maximum
^dfor core material, excludes shell
^eestimated, based on TEM data, see Figure 1.

ISSN: 1477-3155