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Witaminy B1 i B2 w sokach owocowych i owocowo-warzywnych oznaczano techniką wysokosprawnej chromatografii cieczowej par jonowych w odwróconym układzie faz. Średni odzysk witaminy B1 wahał się w zakresie od 85 do 104%, a witaminy B2 od 94 do 106%. Granice wykrywalności i oznaczalności, w mg/ml produktu, wynosiły, odpowiednio: 0,0008 i 0,0024 (witamina B1) oraz 0 0002 i 0,0007 (witamina B2).
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