"prederivatised" meaning in English

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          "text": "O’mahony et al prepared OT-CEC by immobilisation of dodecanethiol gold nanoparticles on prederivatised fused-silica capillaries and applied the columns to separate pyrethroid pesticides [21 ].",
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        "derivatised prior to some other process"
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  "word": "prederivatised"
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  "etymology_text": "From pre- + derivatised.",
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