Cov pa roj carbon activated: yog ib hom tsis-polar adsorbent siv ntau dua. Feem ntau, nws yuav tsum tau ntxuav nrog dilute hydrochloric acid, ua raws li ethanol, thiab tom qab ntawd ntxuav nrog dej. Tom qab ziab ntawm 80 ℃, nws tuaj yeem siv rau kab chromatography. Granular activated carbon yog qhov kev xaiv zoo tshaj plaws rau kem chromatography. Yog tias nws yog cov hmoov zoo ntawm cov pa roj carbon activated, nws yuav tsum tau ntxiv qhov tsim nyog ntawm diatomite raws li kev pab lim dej, kom tsis txhob khiav qeeb dhau.
Cov pa roj carbon activated yog cov tsis muaj polar adsorbent. Nws adsorption yog opposite rau silica gel thiab alumina. Nws muaj kev sib raug zoo rau cov khoom tsis muaj polar. Nws muaj lub peev xwm adsorption muaj zog tshaj plaws hauv cov kua dej aqueous thiab tsis muaj zog hauv cov kuab tshuaj organic. Yog li ntawd, lub peev xwm elution ntawm dej yog qhov tsis muaj zog tshaj plaws thiab cov kuab tshuaj organic muaj zog dua. Thaum cov khoom adsorbed yog eluted los ntawm activated carbon, lub polarity ntawm cov kuab tshuaj txo, thiab lub adsorption muaj peev xwm ntawm lub activated carbon txo, thiab lub elution muaj peev xwm ntawm lub eluent yog enhanced. Cov dej-soluble Cheebtsam, xws li amino acids, suab thaj thiab glycosides, raug cais tawm.