1、 Physically intercept particles and safeguard the lifespan of chromatographic columns

The particle size of the HPLC/UHPLC column packing is small (usually 1.7-5 μ m) and highly sensitive to particulate pollutants. The disposable needle filter uses a pre installed microporous membrane (such as 0.22 μ m or 0.45 μ m pore size) to intercept impurities such as particles, colloids, fibers, etc. in the sample through a physical sieving mechanism. If the sample is injected without filtration, these impurities will block the gaps between the chromatographic column sieve or packing, causing abnormal increase in column pressure, decrease in column efficiency, and even leading to column head collapse. Experiments have shown that using needle filters can extend the service life of chromatography columns by more than three times and significantly reduce instrument maintenance costs.

2、 Reduce matrix interference and improve analysis accuracy

Complex matrix samples (such as biological fluids and environmental water samples) often contain interfering substances such as pigments, lipids, and inorganic salts, which may mask target peaks or cause irreversible adsorption with chromatographic column packing, affecting quantitative results. Disposable needle filters can remove some interfering components and reduce baseline noise and peak tailing phenomena through the adsorption characteristics of the filter membrane (such as hydrophobic membrane for lipid retention) or chemical inertness (such as low adsorption of polar compounds by polyether sulfone membrane). For example, in drug analysis, the peak separation of filtered samples is improved by 15% -20%, and the detection limit is reduced to 0.05 μ g/mL to ensure data reliability.

3、 Adapt to small volume samples and optimize operational efficiency

The disposable needle filter adopts a syringe compatible design, with a small volume (diameter 13-33mm), which can process 0.5mL to 200mL samples and flexibly meet different analysis needs. It is easy to operate - simply inhale the sample into the syringe, install the filter head, manually press and filter, without the need for additional equipment or complex cleaning steps, and the single processing time is shortened to less than 1 minute. For UHPLC analysis (requiring lower dead volume), the low residue design of the needle filter (such as membrane retention volume<0.1mL) can avoid sample loss, ensure accurate injection volume, and achieve repeatability (RSD%) better than 1%, greatly improving analysis efficiency.

Through physical interception, matrix purification, and efficient operation, disposable needle filters have become a tool for HPLC/UHPLC sample pretreatment, providing reliable assurance for high-precision chromatographic analysis.