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Why can A260 by A230 ratio be useful before restriction digest?

Answer and explanation

Correct answer: To check for contaminants such as salts, phenol, or carbohydrates

The A260/A230 ratio indicates the presence of contaminants that absorb near 230 nm in a DNA sample. A low ratio may suggest phenol, salts, carbohydrates, guanidine, or EDTA, which can reduce restriction-enzyme activity or cause an unsuccessful digest. Therefore, checking this ratio before digestion helps assess DNA purity. The restriction enzyme is selected according to its recognition site, not from the A260/A230 ratio. Exam tip: Pure DNA usually has an A260/A230 ratio close to 2.

Related tags

Dna PurityA260 A230 RatioRestriction DigestDna ContaminantsRestriction EnzymesCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnology

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