Table 1.

Properties of magnetic particles (MPs) and nanoparticles (NPs).

Particle	MP	NP
Size (nm)	1000	30
Settling	<5%	None
Peptides per particle	3.0 × 105	20-30
R2 (sec−1/mM Fe)	43	50
M (emu/g Fe)	105	86.6
Fe atoms per particle	2.8 × 109	8000[a]
Particle Conc. @ T2 = 100 msec, (M)	5.1 × 10−15	2.8 × 10−9

^[a]From[22].