Can somebody suggest a way of cleaning thin (1-2 mm diameter), long (~5 cm) capillaries (sealed on one end) from gold nanoparticle solutions?

31 January 2013 1 10K Report

Gold spheres, rods and cages; unconjugated.

I've found the answer if anybody's interested. Use aqua regia (1:3 mixture of nitric and hydrochloric acids) and a syringe with long (>3 inches) 18 Gauge needles. It cleans the capillaries perfectly and removes all the stain from gold. Since the mixture is highly corrosive, don't use the needle for purposes other than cleaning with aqua regia.

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