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• In the first GC columns, the “liquid phase” was coated onto an inert support (firebrick and then diatomataceous earth – the silica shells of sea creatures) • However, these particles create a significant back pressure, limiting the (glass) column lengths to 2 meters • The disadvantage of using a gas as the mobile phase is that it is compressible • For a 2‐meter column, the head gas pressure is twice atmospheric • This slows linear气速和降低分离能力•毛细管柱，将液体覆盖到该色谱柱壁上的毛细管柱在1955年获得专利，但直到1975年才商业化•第一毛细管为硼硅酸盐玻璃 - 很容易折断•柱状长度•最高100米的圆柱长度•纤维上的石英毛细管
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