Adding salt during DNA precipitation neutralizes nucleic acid backbone charges.
the verdict
SUPPORTED
the evidence backs this
confidence 80/100
Adding salt during DNA precipitation provides positive counterions that neutralize or screen the negative charges of the nucleic acid backbone, reducing electrostatic repulsion and allowing the molecules to aggregate.
Evidence for · 3
Using capillary electrophoresis to characterize the hydrodynamic and electrostatic properties of DNA in solutions containing various monovalent cations
2021 · cited by 6
Paper [0] describes how monovalent cations interact electrostatically with the negatively charged nucleic acid backbone to alter DNA properties.
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More for · 2
Study of the polyribosyl-ribitol-phosphate precipitation mechanism by salts and organic solvents.
2019 · cited by 4
Paper [1] notes that charged biopolymers like DNA precipitate when a significant fraction of their backbone charges are neutralized by counterions.
The Impact of Ion Mixing Entropy on Orientational Preferences of DNA Helices: FRET Measurements and Computer Simulations
2023 · cited by 0
Paper [3] explains how mobile cations provide charge screening and neutralization to overcome electrostatic repulsion between DNA backbone charges.