For synthesis of synthetic melanin with an average diameter of 200 nm, 3 ml ammonia aqueous solution (NH4OH, 28–30%; Sigma) was mixed with 40 ml of 200-proof ethanol (Decon Laboratories) and 90 ml Milli-Q water (Millipore) with mild stirring at 30°C for 30 min. 0.5 g dopamine hydrochloride (Sigma) was dissolved in 10 ml Milli-Q water and injected into the above solution. The color of the solution immediately turns pale yellow and quickly darkens to brown. The reaction was left at room temperature for 24 h. The melanin mixture was centrifuged and rinsed with copious amounts of Milli-Q water. To create different concentrations, the melanin was dried, and weighed, and resuspended in RNase-free water (Ambion) before injection.
Rnase free water
RNase-free water is a high-purity water product designed for use in RNA-based applications. It is treated to remove RNase enzymes that could degrade RNA samples. RNase-free water provides a consistent, reliable source of water for maintaining the integrity of RNA during various experimental procedures.
Lab products found in correlation
220 protocols using rnase free water
Preparation and Injection of Synthetic Melanin and Chemical Compounds
For synthesis of synthetic melanin with an average diameter of 200 nm, 3 ml ammonia aqueous solution (NH4OH, 28–30%; Sigma) was mixed with 40 ml of 200-proof ethanol (Decon Laboratories) and 90 ml Milli-Q water (Millipore) with mild stirring at 30°C for 30 min. 0.5 g dopamine hydrochloride (Sigma) was dissolved in 10 ml Milli-Q water and injected into the above solution. The color of the solution immediately turns pale yellow and quickly darkens to brown. The reaction was left at room temperature for 24 h. The melanin mixture was centrifuged and rinsed with copious amounts of Milli-Q water. To create different concentrations, the melanin was dried, and weighed, and resuspended in RNase-free water (Ambion) before injection.
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