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| Product Name | Mass Spectrometry Sample Diluent, LC-MS Grade, Metal-Free |
| Catalog No. | ATRD-0027 |
| Description | Ultra-pure metal-free diluent designed for liquid chromatography-mass spectrometry (LC-MS) sample preparation to dilute peptide digests, small molecule extracts, and metabolite samples prior to injection. Produced using PFA-distilled water and LC-MS grade acetonitrile with 0.1% formic acid in a metal-free production environment to eliminate sodium, potassium, and iron adduct contamination that reduces MS sensitivity. Packaged in acid-leached glass bottles to maintain metal-free integrity throughout product shelf life. |
| Intended Use | Dilution of peptide, protein digest, metabolite extract, and small molecule samples for LC-MS/MS analysis in proteomics, metabolomics, pharmacokinetic, and clinical research applications. |
| Principle / Technology | Metal-free formulation eliminates alkali metal adducts ([M+Na]+, [M+K]+) that compete with [M+H]+ ionization; 0.1% formic acid enhances positive-mode electrospray ionization (ESI) protonation efficiency; LC-MS grade solvents minimize background chemical noise. |
| Detection Method | Dilute sample to desired concentration; briefly vortex; centrifuge at 14,000 × g for 5 minutes before transferring to autosampler vial for LC-MS injection. |
| Sample Type | Tryptic peptide digests, protein digests, extracted metabolites, small molecule drug compounds, lipid extracts. |
| Performance Range / Specifications | Total ion chromatogram (TIC) background <1 × 10^4 counts; sodium adduct intensity <1% of protonated species for standard peptide mixture at 100 fmol on column. |
| Sensitivity / LOD | Metal ion contamination below 0.5 ppb for Na, K, Fe, Ca, and Mg as verified by ICP-MS analysis of each production lot. |
| Specificity | Formic acid at 0.1% v/v provides optimal protonation for positive-mode ESI without causing ion suppression typically observed at higher acid concentrations. |
| Reaction Conditions / Protocol | N/A — diluent serves as injection solvent for LC-MS analysis; no chemical reaction with sample expected. |
| Components / Formulation | LC-MS grade water (≥18.2 MΩ·cm, TOC <2 ppb), LC-MS grade acetonitrile (≥99.9%), formic acid (≥99%, LC-MS grade) 0.1% v/v, prepared in metal-free PFA distillation system. |
| Storage Conditions | Store at room temperature (15-25 °C); keep bottle tightly capped when not in use; protect from direct sunlight. |
| Shelf Life | 12 months from date of manufacture in unopened acid-leached glass bottle. |
| Package Specifications | 100 mL, 500 mL, 1 L acid-leached borosilicate glass bottles with PTFE-lined caps. |
| Product Form | Clear, colorless liquid; free of visible particulate matter. |
| Quality Control | Each lot tested by LC-MS for background signal intensity, ICP-MS for metal ion content (Na, K, Fe, Ca, Mg, Cu, Zn <1 ppb), pH verification, and UV absorbance at 214 nm and 254 nm. |
| Key Features | Metal-free (<0.5 ppb total metals); LC-MS grade solvents; PFA-distilled water; acid-leached glass packaging; low TOC (<2 ppb); minimal alkali adduct formation in ESI-MS. |
| Purity | Water resistivity >18.2 MΩ·cm at 25 °C; TOC <2 ppb; acetonitrile ≥99.9% purity by GC; formic acid ≥99% purity. |
| Concentration | Ready-to-use; acetonitrile content customizable upon request (typically 2-5% v/v for peptide analysis). |
| Activity / Unit Definition | N/A — diluent serves as LC-MS injection vehicle without enzymatic or biological activity. |
| Molecular Weight | Formic acid: 46.03 g/mol; acetonitrile: 41.05 g/mol. |
| Source / Origin | LC-MS grade acetonitrile from high-purity synthesis; PFA-distilled water from dedicated metal-free purification system; formic acid from triple-distilled LC-MS grade. |
| pH Range / Optimal pH | pH approximately 2.7 at 25 °C due to 0.1% formic acid. |
| Shipping Conditions | Ambient temperature; glass bottles packed with protective cushioning. |
| Expiration Date / Stability | 12 months unopened; after opening, use within 3 months and store tightly capped. Retest metal content if stored beyond 6 months after opening. |
| Regulatory / Compliance | For research use only; not for diagnostic procedures. Manufactured in ISO Class 7 cleanroom. |
| Compatibility | Compatible with reversed-phase C18, C8, HILIC, and ion-pairing LC separations. Compatible with ESI, APCI, and nano-ESI ion sources. Use with PEEK or stainless steel LC systems; avoid prolonged contact with unpassivated stainless steel. |
| Recommended Buffer System | 0.1% formic acid in water-acetonitrile mixture; unbuffered for MS compatibility. |
| Application Notes / Precautions | Use only PFA or acid-leached glass containers for handling to maintain metal-free status. Pre-rinse autosampler vials with diluent before use. Avoid contact with metal spatulas, non-PTFE pipette tips, or Kimwipes that can introduce sodium contamination. For very low abundance protein analysis, consider adding 0.01% TFA for improved peptide retention on C18 columns. |
| Batch-to-Batch Consistency | Metal ion content verified by ICP-MS for each batch; Na <0.5 ppb; K <0.2 ppb; Fe <0.3 ppb; TOC <2 ppb. |
For research use only, not for clinical use.
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