Nickel Filter for Liquid Chromatograph Column to Prevent Peak Tailing
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Solution Overview
Problem
In liquid chromatography, stainless steel filters cause a disulfide adsorption phenomenon, leading to peak tailing in chromatograms and reduced sample recovery rates due to strong interactions between peptides and proteins containing cystine with iron ions, resulting in adsorption on the filter surface.
Innovation Solution
Using a nickel or Hastelloy filter with a mesh size smaller than the packing material's particle diameter to prevent disulfide adsorption, ensuring the packing material is enclosed within the column, thereby avoiding iron-related adsorption issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stainless steel filter is used in the liquid chromatograph column, then the filter can effectively enclose the packing material, but amino acids and proteins adsorb on the filter surface causing peak tailing and reduced sample recovery
Solution Approach 1:
The patent changes the material composition parameter of the filter from stainless steel (containing iron) to nickel or Hastelloy (low iron content). This parameter change eliminates the disulfide adsorption phenomenon while maintaining the filter's enclosing function, thereby preventing peak tailing and improving sample recovery rate
Solution Approach 2:
The patent employs composite material selection by using nickel-based alloys (Hastelloy) that combine corrosion resistance with low iron content. This composite material approach maintains the mechanical strength and filtering capability while eliminating the harmful interaction with cystine-containing peptides
2Quantity of substance
If peptides containing cystine interact with iron ions in stainless steel, then strong adsorption occurs on the filter surface, but this causes peak tailing and most peptide is not eluted from the column
Solution Approach 1:
The patent changes the chemical composition parameter of the filter material to reduce iron content to 1% or less. This eliminates the strong interaction between iron ions and cystine residues, preventing both peak tailing and loss of peptide quantity, thereby improving both chromatogram quality and sample recovery
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents peak tailing in chromatograms and enhances sample recovery rates by reducing adsorption of amino acids and proteins on the flow channel, improving analysis accuracy and repeatability.
Implementation Method 1
a filter with a mesh of a size smaller than a particle diameter of the packing material
Implementation Method 2
peptides and proteins including cystine which is a kind of amino acid show a strong interaction with iron ions. disulfide having two sulfur atoms specifically adsorbs on an iron atom on a metallic surface
Implementation Method 3
a main component of the filter is nickel or Hastelloy
Data Source
AI summary
In a liquid chromatograph, the disulfide adsorption of iron atoms in a filter for a column is avoided and thus peak tailing in a chromatogram is prevented to thereby prevent a lowering in the sample recovery rate. A liquid chromatograph column comprising a hollow tubular column body, a bead-shaped packing material which is packed in the hollow part of the column body, a filter provided with a mesh which has a mesh size smaller than the particle diameter of the packing material, and a cap which presses the filter against the packing material to thereby enclose the packing material within the column body, characterized in that the main component of the filter is nickel or hastelloy.