Nanoparticle Diameter: 30 nm PEG: 2 kDa PEG Volume (@ 50 OD): 3 mL Gold nanoparticles functionalized with carboxyl-terminated polyethylene glycol (PEG). Can be covalently conjugated to amine-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