Abstract
Jurubeba fruit, raw and thermally processed for different periods of time, were preserved in soybean oil or vinegar and evaluated for physical characteristics, phytochemicals, antioxidant capacity and polyamines. The loss of green color in many vegetables after cooking is a frequent problem that affects the quality of pickled foods, and chlorophyll content is a relevant parameter to assess the quality. Data showed that a 20 min cooking treatment maintained the best fruit quality and no change in the chlorophyll content occurred. The thermal processing caused no increase in the carotenoid and flavonoid content as compared to the raw fruits, but caused an increase in the phenol content. At a cooking time of about 10 min, the antioxidant capacity increased. Cooking time did not cause significant differences in the content of isoorientin, rutin and caffeic acid. Spermine and spermidine contents were lower after 20 min of boiling. Jurubeba that was preserved in vinegar showed a lower pH and putrescine level, regardless of the cooking time used, whereas the use of oil caused an increase in carotenoids and antioxidant capacity. Key words: Thermal processing, antioxidants, polyamines, phytochemicals, Solanaceae.  
Highlights
Significant improvements have been made through studies of regional dietary habits and considerable inter- and intra-country variability (Kearney, 2010)
Cooking time influenced the quality parameters in S. paniculatum fruit that were conserved in oil (Table 1)
The results showed a slight variation in quality parameters for fruits that were pickled in vegetable oil and cooked for different lengths of time
Summary
Significant improvements have been made through studies of regional dietary habits and considerable inter- and intra-country variability (Kearney, 2010). Much important information has been provided by research that has focused on non-conventional foods that are consumed together with staple foods to improve taste and nutritional quality. These non-conventional foods include Solanum paniculatum L. (Solanaceae), popularly known as “Jurubeba”, which is widely used in folk medicine as a tonic and antipyretic agent (Santos et al, 1988). This plant is native to northern and northeastern regions of Brazil and produces a dark-green fruit that is used for culinary purposes.
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