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https://flic.kr/p/21h83Km | Herbal testing laboratory | Any competent herbal testing lab would consider high-performance thin layer chromatography (HPTLC) as the preferred method for identification of ingredients in finished herbal products. www.cognibrain.com/herbal-research-services/
Thin layer chromatography (TLC) is very useful to chemists as an analytical technique to separate and identify the compounds in a mixture. Only very small samples of the analyte are needed much less than a milligram.
A fun chromatography lab with filter paper as the solid phase and isopropyl alcohol/water as the mobile phase. We tested 2 brands of water-soluble markers and 2 brands of permanent markers. The students got an appreciation that "green" isn't just "green".