Quality of cloudy plum juice produced from fresh fruit of Prunus Domestica L. The effect of cultivar and enzyme treatment

Monika Zbrzezniak, Emilia Nordlund, Monika Mieszczakowska-Frac (Corresponding Author), Witold Plocharski, Dorota Konopacka

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    The quality of cloudy juices produced from two plum cultivars varied in chemical characteristics and native polyphenol oxidase (PPO) activity, and was studied in relation to specific pectinolytic activity of enzyme preparations used for fresh fruit maceration before pressing. Process effectiveness expressed as juice yield, turbidity and the rate of transfer of anthocyanins and polyphenols were determined for five different enzyme preparations, whose activity was also analysed. Juice yields obtained after 1 hour mash maceration (50C, 100 g·t-1) were between 86.6 and 95.4%. The anthocyanins content of the obtained juices strongly depended on the cultivar and ranged from 26 to 50 mg·L-1 for 'Promis', and from 269 to 289 mg·L-1 for ' Cacanska Najbolja', which could be related to the differences in the measured PPO activity (175.4 and 79.8 nkat·g-1, respectively). The type of enzyme preparation strongly affected the degradation rate of anthocyanins during juice processing. Peonidin-3-rutinoside proved to be the most stable during plum juice production in contrast to cyanidin-3-glucoside. Irrespectively of the cultivar, the juice prepared with the mixture of Rohapect PTE + Rohament PL (2 : 1) showed the highest turbidity among the investigated combinations. The results suggest that for the production of cloudy plum juice use of a preparation with low pectin methyl esterase and polygalacturonase activities and high pectin lyase activity could be recommended.
    Original languageEnglish
    Pages (from-to)83-94
    JournalJournal of Horticultural Research
    Volume23
    Issue number2
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Keywords

    • degradation of anthocyanins
    • enzyme activity
    • juice processing
    • plum
    • PPO activity

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