Nanoparticle Diameter: 4 nm PEG: 2 kDa PEG Volume (@ 50 OD): 0.4 mL Gold nanoparticles functionalized with Biotin-terminated Polyethylene Glycol (PEG). Can be directly conjugated to streptavidin-functionalized molecules or substrate Core diameter: 4 nm – 200 nm Shelf life: > 4 months (4°C storage) Supplied as liquid suspension in PBS or in water with 0.01% (w/v) Tween-20