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nestekromatografiakolonni, 250 mm x 4 mm, c18, hiukkaskoko 5 tai 10 >iso_7>ì>iso_1>m, tai vastaava (suorituskykyvaatimus: vain yksi piikki kaikille retinoli-isomeereille ko. hplc-ajo-olosuhteilla).
liquid chromatographic column, 250 mm x 4 mm, c18, 5 or 10 >iso_7>ì>iso_1>m packing, or equivalent (performance criterion: only a single peak for all retinol isomers under the hplc-conditions)