Forensic analytics

Forensic analytics is the informal overlap of forensic analytical chemistry and peptide drug quality control that addresses three practical questions: Is the peptide the right molecule? How much of the sample is the intended peptide? What else is present? Forensic analytical chemistry identifies and measures chemical components in unknown or legally relevant samples; peptide drug quality control checks identity, purity, and impurity profiles. It is not a formally defined laboratory term in the peptide or research-chemical field.

Analytical methods used in practice

Three core techniques cover the main analytical needs in forensic analytics: reversed-phase HPLC for separation and chromatographic purity, mass spectrometry for molecular identity, and LC-HRMS for detecting related peptide impurities. Reversed-phase HPLC separates sample components and reports chromatographic purity as the area under the main peak. Mass spectrometry (LC-MS, MALDI-TOF, HRMS) confirms molecular identity by measuring mass-to-charge ratios. LC-HRMS combines both approaches to detect related peptide impurities, such as truncated, oxidized, or acetylated forms.

Key limits when interpreting lab reports

• A "98% purity" figure may reflect chromatographic area percentage rather than absolute peptide content by weight.
• HPLC alone does not prove identity; identity confirmation requires mass spectrometry.
• A clean chromatogram can still miss safety-relevant impurities.
• The word "forensic" on a certificate of analysis does not by itself guarantee legal defensibility; genuine forensic-grade work requires documented validation, reference standards, blanks, controls, and defined procedures.
• Presumptive tests, such as colorimetric field tests, are not confirmatory analysis.

Sources

1. Liquid Chromatography-High Resolution Mass Spectrometry for Peptide Drug Quality Control - PMC
2. Proteomics in forensics: from source attribution to reconstruction of events
3. New Approaches To Identify Urine and Hair Adulteration Attempts in Forensic Toxicology: A Proof-of-Concept Study Using a Proteomics Approach Based on Liquid Chromatography–Mass Spectrometry (LC-MS)
4. Advances in testing for sample manipulation in clinical and forensic toxicology - Part A: urine samples
5. Quality issue management and disclosure in forensic science: A survey of practice and perceptions
6. Impurity profiling quality control testing of synthetic peptides using ...
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9. Endogenous ethanol 'auto-brewery syndrome' as a drunk-driving defence challenge
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11. An overview on forensic analysis devoted to analytical chemists
12. [PDF] THE ROLE OF ANALYTICAL CHEMISTRY IN FORENSIC SCIENCE
13. Forensic Applications of Analytical Chemistry | Lab Manager
14. Quantitative and qualitative analysis of chemicals in forensics | Chemistry | Research Starters | EBSCO Research
15. Journal of Analytical & Bioanalytical Techniques - Forensic Analytical Chemistry: Techniques for Crime Scene Investigation and Evidence Analysis
16. Peptide purity standards: HPLC, mass spec, and what >98% really means | Compound Review
17. HPLC vs Mass Spectrometry for Peptide Purity Testing: An Analytical Methods Guide
18. Forensic Analytical Chemistry for Minimizing Injustice: Advances and Challenges | Annual Reviews