A260/280 Purity Ratio 1.8-2.1 Window Checker
Screen measured A260/A280 against the educational 1.8–2.1 window; blanking, pH, matrix and assay suitability still matter.
Description
Screen measured A260/A280 against the educational 1.8–2.1 window; blanking, pH, matrix and assay suitability still matter.
A nucleic-acid absorbance ratio can be compared with a declared educational window. Such a comparison is a limited screen rather than a full assessment of sample purity.
When to use this tool
Screen measured A260/A280 against the educational 1.8–2.1 window; blanking, pH, matrix and assay suitability still matter.
- Prepare the supplied a260, a280 fields for this operation.
- Compare the complete example with the representation used by your own input before carrying the result into another step.
How to use the tool and how it works
- Enter a260, a280. Use the exact text syntax, units and index conventions explained below.
- Run the tool. If input validation fails, correct the supplied fields before interpreting any result.
- Read result.ratio, result.inEducationalWindow, result.purityConfirmed. Interpret false, null and empty lists using the distinctions below; they can be valid outputs.
Require nonnegative a260 and positive a280. Return their ratio, test whether it lies inclusively between 1.8 and 2.1, and set purityConfirmed false.1
| Input field | Meaning and representation | Accepted input |
|---|---|---|
| a260 | a260. | Finite number; zero or greater |
| a280 | a280. | Finite number; greater than zero |
| Output field | Interpretation |
|---|---|
| result | Object containing the named outputs below. |
| result.ratio | The ratio value under the stated formula or text convention. |
| result.inEducationalWindow | Flag for in educational window under the exact condition described above. |
| result.purityConfirmed | Flag for purity confirmed under the exact condition described above. |
{
"input": {
"a260": 2,
"a280": 1
},
"output": {
"result": {
"ratio": 2,
"inEducationalWindow": true,
"purityConfirmed": false
}
}
}Limitations and assumptions
- The fixed window is the implementation's educational convention, not a universal acceptance criterion. Instrument baselines, sample chemistry, uncertainty and other quality measurements are not evaluated.
- Every declared top-level field is required and unexpected fields are rejected. Numeric inputs must be finite; ordinary text fields are bounded to 8,192 UTF-16 code units, with tighter operation-specific limits where stated.
- Ordinary string lists have at most 128 entries of at most 128 code units each; numeric lists and matrices have separate bounded size checks. Nonfinite results and excessively large serialized outputs are rejected.
- Indexes are zero-based and spans have an exclusive end unless explicitly stated otherwise. A valid false, null or empty-list result is distinct from malformed input.
Alternative or Complementary methods
Use a complete assay-analysis workflow for normalization, quality control and inference. Keep supplied measurements, fixed educational windows and caller-chosen thresholds distinct; these tools perform the documented calculation or retrieve a short reference note.
References
Similar or alternative tools
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