Gold nanoparticles functionalized with amine-terminated polyethylene glycol (PEG).
 
	
Can be covalently conjugated to carboxyl-terminated molecules
	
Core diameter: 4 nm – 200 nm
	
Absorbance peak: 520 – 850 nm
	
Shelf life: > 1 year (4°C storage)
	
Supplied as liquid suspension in PBS or in water with 0.01% (w/v) Tween-20