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ICP-MS

ICP-MS (Inductively Coupled Plasma Mass Spectrometry) is a highly sensitive laboratory test for detecting and measuring chemical elements, including heavy metals, in extremely small amounts. The method destroys the sample completely. It can demonstrate metal safety, but it cannot identify the molecule itself.

Also called: Inductively Coupled Plasma Mass Spectrometry, ICPMS

ICP-MS (Inductively Coupled Plasma Mass Spectrometry) is a highly sensitive analytical method used to identify and measure elemental impurities, such as heavy metals, down to sub-parts-per-trillion levels. The technique uses superheated argon gas, known as plasma, to break a sample into atomic ions, which a mass spectrometer then counts based on their mass-to-charge ratio.

ICP-MS verifies elemental impurity safety on peptide certificates

On a peptide Certificate of Analysis (CoA), ICP-MS is the standard for ensuring that toxic metals like lead, mercury, or arsenic stay below strict safety limits. These limits are governed by international guidelines such as USP <233> and ICH Q3D to protect consumer health. While ICP-MS is the validated method for trace metal detection, it cannot confirm a peptide's identity, sequence, or organic purity because the high-energy plasma destroys the molecular structure. For those specific metrics, laboratories rely on molecular techniques like HPLC or LC-MS.

Common method distinctions and technical mix-ups with ICP-MS

  • ICP-MS vs. LC-MS: These methods analyze fundamentally different properties. LC-MS keeps the molecule intact to determine its structure and purity, while ICP-MS destroys the molecule to identify its individual atomic elements.
  • ICP-MS vs. ICP-OES: Although both use argon plasma, ICP-OES measures the light emitted by atoms rather than their mass. This difference makes ICP-MS significantly more sensitive for detecting ultra-trace levels of contaminants.

Sources

  1. Inductively Coupled Plasma Mass Spectrometry: Introduction to Analytical Aspects - PMC
  2. Development and validation of an ICP-MS method for the determination of elemental impurities in TP-6076 active pharmaceutical ingredient (API) according to USP 〈232〉/〈233〉 - PubMed
  3. Selective Detection of Peptide-Oligonucleotide Heteroconjugates Utilizing Capillary HPLC-ICPMS
  4. Investigation of Elemental Mass Spectrometry in Pharmacology for Peptide Quantitation at Femtomolar Levels
  5. Progress in ICP-MS Analysis of Minerals and Heavy Metals in Traditional Medicine
  6. Perspectives of Quantitative GC-MS, LC-MS, and ICP-MS in the Clinical Medicine Science—The Role of Analytical Chemistry - PMC
  7. The Role of ICP-MS in Separation Science
  8. [PDF] Elemental Impurities in Drug Products Guidance for Industry - FDA
  9. [PDF] FDA Guidance on Elemental Impurities in Drug Products | USP
  10. Inductively coupled plasma mass spectrometry - Wikipedia
  11. What is ICP-MS (Inductively Coupled Plasma Mass Spectrometry)? : SHIMADZU (Shimadzu Corporation)
  12. How ICP-MS Works: A Detailed Guide to Its Working Principles
  13. [PDF] Inductively Coupled Plasma Mass Spectrometry (ICP-MS) - IIT Kanpur
  14. Inductively coupled plasma mass spectrometry | Springer Nature Experiments
  15. FDA & EMA Guidance on Peptide Impurities Explained
  16. ICP-OES, ICP-MS and AAS Techniques Compared
  17. 11.3: Inductively Coupled Plasma Mass Spectrometer - Chemistry LibreTexts
  18. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) Information | Thermo Fisher Scientific - US