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Puzzling Aqueous Solubility of Guanine Obscured by the Formation of Nanoparticles

Puzzling Aqueous Solubility of Guanine Obscured by the Formation of Nanoparticles

Termeh Darvishzad, Tomasz Lubera, Stefan S Kurek

J Phys Chem B. 2018 Aug 2;122(30):7497-7502.

PMID: 29999329

Abstract:

Dissolution of guanine in neutral solutions was obscured by peculiar behavior of guanine, indicating an apparent dependence of solubility on the amount of solid guanine used. Here, we demonstrate that the problem is caused by the formation of tiny guanine nanoparticles that tend to grow forming stable particles of ca. 800 nm size. This effect can be minimalized by using small quantities of guanine powder for dissolution. We also show that assuming a constant, independent of pH, concentration of neutral form of guanine, at 25 °C equal 25.4 μM, and applying known p Ka values related to its dissociation or protonation, it is possible to calculate the concentrations of all conjugate acids and bases of guanine at the given pH value, and by summing them up, the guanine solubility.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP73405-A	Guanine		73-40-5	Price

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