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EN
The aim of this study was to evaluate the effect of steam blanching processing on the nutritive value and the antioxidant properties of fi ve leafy vegetable species (Amaranthus hybridus, Andasonia digitata, Ceiba patendra, Hibiscus sabdariffa and Vigna unguiculata) that are used for sauce preparation in Northern Côte d’Ivoire. The selected leafy vegetables were subjected to blanching in pressure cooker for 15, 25 and 45 min and the physicochemical properties were determined using AOAC methods. The result of the study revealed that longer time of blanching (higher than 15 min) caused negative impact by reducing nutritive value but positive impact by reducing anti-nutrients and increasing polyphenols. The registered losses (p<0.05) at 15 min were as follow: ash (0.08–10.01%), proteins (0.36–12.03%), vitamin C (19.56–68.67%), carotenoids (18.91–55.48%) oxalates (3.58–21.39%) and phytates (10.51–68.02%). The average increase of polyphenols contents at 15 min of blanching was 1.61 to 30.72%. In addition, a slight increase (0.35–4.16%) of fi bres content was observed in the studied blanched leafy vegetables. Furthermore, after 15 min of blanching time the residual contents (p<0.05) of minerals were: calcium (264.88–844.92 mg/100 g), magnesium (49.45–435.43 mg/100 g), potassium (675–1895.41 mg/100 g), iron (14.54–70.89 mg/100 g) and zinc (9.48–36.46 mg/100 g). All these results suggest that the recommended time of domestic blanching must be less than 15 min for the studied leafy vegetables in order to contribute effi ciently to the nutritional requirement and to the food security of Ivorian population.
PL
Metodą absorpcyjnej spektrometrii atomowej (ASA) oznaczono zawartość manganu, miedzi, cynku i żelaza w jadalnych liściach, łodygach i nadziemnych zgrubieniach łodygowych warzyw uprawianych na terenie woj. gdańskiego. Stężenia wymienionych metali w zbadanych warzywach liściastych wydawały się być typowe dla tych środków spożywczych.
EN
Manganese, cooper, zinc and iron content of 24 species and varieties of leafy vegetables cultivated in the period of 1988 - 1989 in the region of Province of Gdańsk, was determined by atomic absorption spectrometry after dry ashing and dissolving in 1N nitric acid. Results obtained seemed to be typical of the vegetables under investigation and were roughly comparable to those reported by the other authors with reference to the similar products cultivated in the central and southern regions of the country.
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