C18 packing is one of the stationary phase materials used in reverse phase chromatography, usually based on high-purity silica gel and bonded with octadecylsilane (C18) to form a hydrophobic stationary phase. It is a "universal core packing" for liquid chromatography separation. The core characteristics of $r $n are long carbon chains and strong hydrophobicity, which can retain organic compounds with medium to weak polarity (such as drugs, natural products, environmental pollutants, etc.) through hydrophobic interactions. Separation selectivity can be adjusted through carbon chain bonding processes, end capping treatments, etc. - fully capped C18 can reduce interference from silanol groups and improve peak symmetry;
C18 packing is a stationary phase material used in reverse phase liquid chromatography. It uses high-purity porous silica gel as the matrix core and connects octadecylsilane (C18) chains to the surface of the silica gel through chemical bonding process, forming a highly hydrophobic stationary phase structure. It is one of the "universal basic consumables" in laboratory chromatographic separation scenarios.
Its core characteristics stem from the structure of the octadecyl carbon chain: the long carbon chain endows the filler with strong hydrophobic properties, which can interact with the hydrophobic groups of the target compound to achieve the retention and separation of moderately to weakly polar organic molecules, such as pharmaceutical intermediates, natural products (such as lignin and flavonoids), food additives, environmental pollutants, etc., all of which are typical separation objects. At the same time, the performance of C18 fillers can be adjusted through process details: fully capped products will use silane reagents to shield residual silanol groups in the silica gel matrix, reducing peak tailing problems caused by secondary adsorption and improving the symmetry of separation peak shapes; Unfolded products retain some silanol groups and increase polarity binding sites to meet the separation requirements of some special polarity samples.
From the perspective of specifications, the particle size, pore size, and other parameters of C18 fillers need to be matched with application scenarios: analytical scenarios commonly use particle sizes of 3 μ m and 5 μ m, combined with pore sizes of 100 Å -120 Å, to ensure efficient mass transfer and separation efficiency of small molecule compounds; For preparation scenarios, larger particle sizes (such as 10 μ m) will be selected to balance separation capability and sample loading capacity. In addition, its pH tolerance range is usually between 2-8 (some modified products can be extended to 1-10), which is suitable for the elution requirements of different mobile phase systems. It can achieve gradient elution separation of different compounds by adjusting the organic phase ratio (such as acetonitrile water, methanol water system).
As the core filler of reverse phase chromatography, the adaptability of C18 filler covers multiple fields such as purity detection in pharmaceutical research and development, residue screening in food safety, and pollutant analysis in environmental monitoring. It is one of the basic supporting materials for laboratory to achieve complex sample separation and qualitative and quantitative analysis.
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