Video: Dab tsi ua rau TLC hnyav hnyav?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Solvent (Mob Phase) Tsim nyog kuab tshuaj kev xaiv yog tej zaum qhov tseem ceeb tshaj plaws ntawm TLC , thiab txiav txim qhov qhov hnyav tshaj plaws tej zaum yuav xav tau kev sim thiab ua yuam kev. Raws li nrog kev xaiv phaj, nco ntsoov cov tshuaj lom neeg ntawm cov analytes. Ib qho pib kuab tshuaj yog 1: 1 hexane: ethyl acetate.
Hauv qhov no, dab tsi hnyav siv rau TLC?
Ib qho hnyav uas tuaj yeem siv rau kev sib cais cov sib xyaw ua ke ntawm cov tebchaw uas muaj zog heev ethyl acetate hmoov Tom ntej: Butanol acetic acid dej, 80:10:5:5. Txhawm rau cais cov khoom tseem ceeb, sib tov ntawm 10% NH4OH hauv methanol, thiab 1 txog 10% sib tov ntawm no hauv dichlormethane.
Qhov thib ob, puas muaj cov kuab tshuaj ntau dua polar elute sai dua? Qhov siab dua qhov feem pua ntawm polar kuab tshuaj , cov sai dua tshuaj sib xyaw yuav luag . Nws kuj tseem yuav pab tau kom nco ntsoov tias alumina thiab silica muaj ntau ntau polar tshaj txhua yam organic kuab tshuaj . Yog li ntawd, nyob ruaj khov theem yuav ib txwm ua ntau polar tshaj qhov mobile.
Ib yam li ntawd, tib neeg nug, cov kuab tshuaj cuam tshuam li cas TLC?
Lub zog eluting ntawm cov kuab tshuaj nce nrog polarity. Yog li ntawd, tsis tshua muaj polarity tebchaw yuav eluted nrog tsawg polarity cov kuab tshuaj , thaum cov polarity ntau dua xav tau cov kuab tshuaj ntawm polarity siab dua. Lub zog muaj zog yog khi rau lub adsorbent, qeeb qeeb nws txav mus rau TLC phaj.
Kuv tuaj yeem txhim kho kuv qhov kev sib cais TLC li cas?
Re: TLC : nce chaw kev sib cais Koj tuaj yeem sim ntxiv me me ntawm cov kua qaub tsis muaj zog lossis cov hauv paus rau cov kuab tshuaj, xws li 0.1% TEA hauv MeOH / DCM sib tov, lossis 0.1% AcOH hauv EtOAc / Heptane sib tov.
Pom zoo:
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