N,N-DIMETHYLFORMAMIDE for Residual analysis, Headspace analysis. GC Grade solvent.

nn dimethyl formamide is a tertiary amide the nitrogen atom bears two methyl groups and a formyl group, giving it a polar aprotic character. This structure enables DMF to dissolve both polar and moderately non-polar compounds, including active pharmaceutical ingredients (APIs), excipients, and complex organic matrices that resist dissolution in less polar solvents. Its high polarity combined with thermal stability at GC oven temperatures makes it particularly valuable in analytical workflows where sample dissolution and chromatographic inertness must both be achieved.

Key chemical properties 

The GC grade designation on dimethylformamide CAS no 68 12 2 signifies the solvent has been tested and verified against chromatographic performance parameters beyond standard analytical reagent grade: 

• Purity ≥99.8% by GC area% — lot-tested by gas chromatography to confirm overall chemical purity 

• Water content ≤0.005% by Karl Fischer — critical for headspace GC accuracy; moisture introduces erroneous peaks and affects sample equilibrium 

• Non-volatile residue ≤0.001% — no detectable contamination deposited in injector or column after evaporation 

• Chromatographic background verified — GC run of neat solvent confirms absence of interfering peaks across the target analytical window 

GC-grade nn dimethyl formamide is used across a narrow but critical range of analytical applications where its thermal stability, solvency power, and chromatographic inertness are essential: 

Residual solvent analysis — ICH Q3C 

DMF is the matrix solvent of choice for ICH Q3C residual solvent profiling of pharmaceutical APIs and formulations. It dissolves most solid pharmaceutical matrices at concentrations sufficient for headspace injection, releasing volatile Class 1, 2, and 3 residual solvents into the headspace vial without itself interfering with the GC window used for their detection. Its ICH Q3C Class 2 status (PDE 8.8 mg/day) means it must also be quantified as a target analyte when present as a process solvent in the API manufacturing route. 

Headspace gas chromatography 

In headspace GC, the sample is dissolved in DMF in a sealed vial, which is heated to equilibrium temperature. Volatile analytes partition into the headspace vapour, which is then injected onto the GC column. DMF's high boiling point (153°C) ensures it remains predominantly in the liquid phase during headspace equilibration, contributing minimal background signal in the GC run. It is compatible with USP <467> and EP 2.4.24 headspace methods, and can be used alongside other GC-grade solvents such as dimethyl sulphoxide (DMSO) for samples that require a co-solvent to achieve complete dissolution. 

Pharmaceutical and chemical synthesis 

Beyond analytical use, DMF is an established reaction medium for amidation, esterification, alkylation, peptide coupling, and other synthetic transformations in pharmaceutical and fine chemical manufacturing. Its high boiling point and thermal stability allow reactions at elevated temperatures that would not be possible in lower-boiling solvents. 

• Peptide coupling and solid-phase synthesis — preferred solvent for coupling reagents such as HATU and HOBt 

• Polymer processing — membrane production, fibre casting, and polyacrylonitrile processing 

• Electronics and semiconductor manufacturing — precision cleaning and coating applications 

DMF's boiling point of 153°C means it elutes relatively late in a typical GC temperature programme. When developing residual solvent methods using DMF as the diluent, programme your oven to ramp to at least 160°C at the end of the run to fully elute DMF and prevent column contamination from run to run. If DMF itself is also a target analyte (as required by ICH Q3C when DMF is a process solvent), ensure your column and detector are properly calibrated for DMF at the concentrations of interest. 

For samples that are difficult to dissolve in DMF alone, DMF can be combined with other polar solvents. When pairing with acetonitrile for HPLC in complementary analytical workflows, note that acetonitrile is not compatible with headspace GC at high concentrations due to its low boiling point use DMF as the primary matrix for headspace and reserve acetonitrile for HPLC-based complementary methods. 

Lab Chemicals has been supplying GC-grade and analytical-grade solvents to pharmaceutical manufacturers, NABL-accredited contract laboratories, research institutions, and industrial QC facilities across India for over three decades. We are authorised distributors for leading global reagent brands and supply DMF with full CoA and SDS documentation, traceable to the manufacturer's batch record. Our technical team includes analytical chemists with experience in residual solvent method development and ICH Q3C compliance available to advise on solvent grade selection, method suitability, and documentation requirements before ordering.