Nanoparticle Diameter: 7 nm PEG: 1 kDa PEG Volume (@ 50 OD): 3 mL Gold nanoparticles functionalized with methyl-terminated polyethylene glycol (PEG). Biologically inert surface chemistry Highly resistant to non-specific serum protein adsorption and cell binding 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