Analytical quality
Interpreting recovery and matrix effects
Recovery and matrix effects: Did the signal change because of sample loss or detector response?
Source editorial review:
Before interpreting the result
Did the signal change because of sample loss or detector response?
- Identify when the analyte or comparison standard was added.
- Compare preparation, matrix extract and reference solution separately.
- Verify that the proposed correction was assessed in representative matrices.
Recovery and matrix effects
Sample preparation can lose some analyte, while accompanying components can modify system response. These are different problems: recovery and matrix effects. A result close to expectation can conceal compensation between them. Evaluating them requires a design that separates preparation from analytical response, using references and comparisons appropriate to the studied matrix.
A reading case: what to check
When two formulations yield different signals at the same nominal concentration, do not attribute the entire difference to peptide quantity. Review solvents, excipients and extraction or transfer stages. Calibration prepared in another medium may not represent the sample. The record should identify what was evaluated, in which matrix, and which part of the uncertainty remains unresolved.
What to preserve in the record
Low recovery and signal suppression can require different investigations. Recording both contributions avoids numerically correcting a physical loss as though it were solely a detector effect.
Questions and answers
Did the signal change because of sample loss or detector response?
Sample preparation can lose some analyte, while accompanying components can modify system response. These are different problems: recovery and matrix effects. A result close to expectation can conceal compensation between them. Evaluating them requires a design that separates preparation from analytical response, using references and comparisons appropriate to the studied matrix.
What should the review record preserve?
Low recovery and signal suppression can require different investigations. Recording both contributions avoids numerically correcting a physical loss as though it were solely a detector effect.