The aim of this preliminary research was to determine the changes of phenolic compounds during apple processing into sauces, cloudy and clear juices. Four cultivars were investigated: Jonagolď, Sampioni, Idared, Topaz. Phenolic compounds content was investigated by HPLC method with novel type of column Fusion RP (Phenomenex). Production of sauces leads to minimal changes of phenolic compounds in relation to fruits. Among juices highest amount of phenolics (53%) were detected in natural cloudy juices. Clear juices contained from 19 to 40% of phenolics depending on enzyme preparation used and temperature of enzymation.
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