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Drying rates of Rubi grapes submitted to chemical pretreatments for raisin production

Pesquisa Agropecuaria Brasileira, ISSN: 1678-3921, Vol: 41, Issue: 3, Page: 503-509
2006
  • 12
    Citations
  • 15,901
    Usage
  • 20
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    12
    • Citation Indexes
      12
  • Usage
    15,901
    • Full Text Views
      14,466
    • Abstract Views
      1,435
  • Captures
    20

Article Description

The objective of this work was to determine the most appropriated chemical treatment to be used to dry grapes cv. Rubi for raisin production. Drying curves for convective drying with air at 50°C, in a tray drier, were obtained for grapes submitted to chemical pretreatments with different concentrations of potassium carbonate and olive oil, and different dipping times, according to factorial designs. Convective drying curves were also obtained for grapes pretreated in aqueous suspensions of soybean lecithin, at varied lecithin concentrations and dipping times. Page model was adjusted to the experimental drying curves, and the calculated drying times showed that the best pretreatment consisted in dipping grapes for 2 minutes in a 5% olive oil and 6% K CO emulsion, at 50°C, which resulted in a drying time close to that of the pretreatment with 2.5% of olive oil, but with a lower consumption of this substance. In addition, the immersion of grapes in an aqueous suspension of 2% soy lecithin, at 50°C, for 5 minutes, resulted in a total drying time slightly higher than the most effective pretreatment.

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