Limit of Detection (LOD)
Limit of Detection (LOD) — The lowest concentration of an analyte that can be reliably detected but not necessarily quantified by an analytical method.
What Is the Limit of Detection?
The limit of detection (LOD) is the lowest concentration of a peptide that can be reliably distinguished from background noise. LOD is defined as the concentration producing a signal-to-noise ratio of 3:1 (or 3.3σ/slope of calibration curve per ICH guidelines). LOD determines whether an analytical method is sensitive enough for the intended application.
Context
- HPLC-UV: LOD typically 0.1-1 µg/mL for peptides at 214 nm
- LC-MS: LOD 0.1-10 ng/mL. 100-1000x more sensitive than UV
- ELISA: LOD 1-100 pg/mL for peptide hormones
- vs. LOQ: LOQ (S/N = 10) is the lowest accurately quantifiable concentration
Frequently Asked Questions
What is Limit of Detection (LOD)?
The lowest concentration of an analyte that can be reliably detected but not necessarily quantified by an analytical method.
Why is Limit of Detection (LOD) important in peptide research?
Limit of Detection (LOD) is a fundamental concept in analytical as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.
Authority Sources
- Limit of Detection (LOD) on Wikipedia
- Search Limit of Detection (LOD) on PubChem (NIH)
- Research articles on ScienceDirect