Trifluoroacetic acid

Trifluoroacetic acid (TFA) is a strong, volatile organic acid. Its strong acidity, volatility and miscibility with common HPLC solvents make it a widely used mobile-phase additive in liquid chromatography. In reversed-phase HPLC, TFA is commonly used to acidify the mobile phase and help improve the chromatographic behavior of ionizable analytes. The acidic environment can support reproducible retention and peak shape, particularly for peptides, proteins and other basic compounds. TFA can also interact with charged analytes and influence selectivity, so its concentration and use should be established as part of the individual method.

TFA, HPLC grade, is designed for use as an acidic mobile-phase component in HPLC, especially reversed-phase methods. By lowering the mobile-phase pH, TFA can help control the ionization of analytes and contribute to consistent retention and peak shape. This makes it useful in methods for peptides, proteins, pharmaceuticals and other compounds with basic or ionizable functional groups.

TFA can be added to aqueous and organic mobile phases, including commonly used HPLC solvent systems. The required concentration depends on the analyte, stationary phase, detector and method objective. Method developers should optimize the concentration experimentally and verify system suitability before routine use.

For UV-detected HPLC, impurities that absorb in the detector’s operating range can increase baseline absorbance or affect sensitivity. A defined UV absorbance specification helps to understand the intended quality profile of the reagent before method use.

Practical method considerations

• UV detection: Select the detection wavelength with the specified UV absorbance limits in mind. The product has defined limits at 260, 270, 280, 290, 300 and 320 nm; these limits are listed in the Features and benefits section.
• Gradient methods: TFA is suitable for use in aqueous/organic gradient systems when the method has been developed and qualified for the chosen composition and gradient profile.
• Peak shape and retention: TFA may improve the chromatographic behavior of some basic or ionizable analytes, but the effect is analyte- and method-dependent.
• Detector and MS compatibility: TFA is volatile, but it can reduce electrospray ionization response in LC-MS for some analytes. For MS-based methods, evaluate signal response and consider whether an alternative acidic modifier is more appropriate.
• System suitability: Confirm retention, resolution, peak shape, baseline behavior and detector response under the final method conditions.

Appropriate for trace environmental analysis.

Used as a:

• Mobile phase component in the estimation of chlorogenic acid and rutin in Rosaceae extracts by HPLC
• Solvent to extract rabbit plasma, followed by HPLC purification of plasma protein content
• Mobile phase solvent for separation of amino acids extracted from sediments, prior to HPLC analysis

TFA, HPLCgrade, is manufactured with a defined specification intended to supportreliable chromatographic work.

The productspecification defines UV absorbance limits at the following wavelengths:

Wavelength Maximum UV absorbance

320 nm ≤ 0.025

300 nm ≤ 0.03

290 nm ≤ 0.04

280 nm ≤ 0.05

270 nm ≤ 0.10

260 nm ≤ 1.0

What these wavelength specifications mean

• The listed limits apply specifically to 260, 270,280, 290, 300 and 320 nm.
• The limits become more stringent at the longerwavelengths from 270 to 320 nm, supporting use in HPLC methods with detectionin those specified regions.
• The 260 nm limit is < 1.0, which is lessstringent than the limits specified at 270–320 nm. Users working close to 260nm should therefore account for the higher permitted absorbance when assessingbaseline and sensitivity.
• Performance at other wavelengths should be evaluated bythe user under the intended method conditions

Key customer benefits

• Defined HPLC quality: A specification tailoredto chromatographic reagent use.
• Controlled UV profile: Absorbance limits arestated at six named wavelengths rather than implied across an undefined UVrange.
• Low residue: Residue on evaporation is limitedto < 0.005%, helping reduce the risk of non-volatile contamination from thereagent.
• Controlled water content: Water is limited to< 0.05% by Karl Fischer analysis.
• High purity and consistent assay: GC purity is> 99.00 area % and titration assay is controlled to 99.00–101.00%.
• Clear expectations: The specificationidentifies the wavelengths and quality attributes within scope, helping usersselect the reagent for their HPLC method with appropriate expectations.