Asetada kahte 250ml mahuga lihvkorgiga mõõtekolbi A ja B võrdne kogus hoolikalt peenestatud proovi, mis sisaldab ligikaudu 200 g vitamiini C. Lisada kolbi A 0,4 ml standardlahust ja segada kergelt loksutades (sisestandard).
The sterols are transformed into trimethyl-silyl ethers and are analysed by capillary-column gas chromatography with reference to an internal standard betulin.
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