Percorrer por autor "Levizou, Efi"
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- Evaluation of various ecotypes of “stamnagathi’ (Cichorium spinosum L.)Publication . Caroussou, D.; Petropoulos, Spyridon Α.; Levizou, Efi; Fernandes, Ângela; Barros, Lillian; Barreira, João C.M.; Ferreira, Isabel C.F.R.; Ntatsi, GeorgiaIn the present study, the evaluation of chemical composition of various ecotypes of “stamnagathi” (Cichorium spinosum L.) was carried out. Seeds from selected ecotypes were collected in situ and sown in seed trays for plant propagation and consequent plant production. At the harvest stage, the dry matter, chlorophyll, sugars, fatty acids and organic acids content in leaves was measured. Regarding dry matter content, significant differences were observed among the ecotypes, with mean values ranging from 6.3 to 8.3%. Differences were also observed in chlorophyll a, b and total chlorophyll, with ecotypes B and D having the highest content comparing to ecotypes A and C. Sugars content differed among the ecotypes for all the detected sugars (glucose, fructose, sucrose) and the total sugars content. Ascorbic acid was detected only in the case of ecotypes B and C, whereas in the other two ecotypes only traces were detected. Finally, regarding tocopherols content, significant differences were observed for both α- tocopherol, with ecotype B having the highest content followed by ecotype C, and δ- tocopherol, where the highest content was observed for ecotype C. For total tocopherols, ecotype C had also the highest content comparing to the other ecotypes. Fatty acids content did not differ among the studied ecotypes, for both the content of the main fatty acids (α-linolenic, linoleic and palmitic acid) and the monounsaturated fatty acids (MUFA), polyunsaturated fatty acids (PUFA) and total fatty acids (TFA) content. In conclusion, genotype has an important effect on nutritional and chemical composition of ‘stamnagathi’ ecotypes, and special interest rises for detecting and evaluating ecotypes with high quality profile for commercial cultivation.
- Nutritional profile and chemical composition of Cichorium spinosum ecotypesPublication . Petropoulos, Spyridon Α.; Fernandes, Ângela; Ntatsi, Georgia; Levizou, Efi; Barros, Lillian; Ferreira, Isabel C.F.R.Wild edible greens have been consumed as leafy vegetables throughout the centuries by many rural communities within the Mediterranean basin. In the present study, the nutritional profile and chemical composition of various Cichorium spinosum L. ecotypes was evaluated. For this purpose, ten ecotypes of C. spinosum collected in situ, grown in pots or purchased by retail supermarkets were examined. Nutritional value showed a great variation between the studied ecotypes for all the assessed parameters, whereas significant differences were observed between wild and cultivated ecotypes, as well as between conventionally cultivated and organic products. In terms of fatty acid composition, the conventionally grown ecotype had the highest nutritional value, as expressed by polyunsaturated fatty acids/unsaturated fatty acids (PUFA/SFA) and omega-6/omega-3 (n-6/n-3) fatty acids ratios. In conclusion, considering the differences between ecotypes, grown conditions and cultivation systems observed in this study, the selection of ecotypes with high nutritional value and their incorporation in commercial cultivation systems could allow for further exploitation of C. spinosum
- Salinity effect on nutritional value, chemical composition and bioactive compounds content of Cichorium spinosum L.Publication . Petropoulos, Spyridon Α.; Levizou, Efi; Ntatsi, Georgia; Fernandes, Ângela; Petrotos, Konstantinos; Akoumianakis, Konstantinos; Barros, Lillian; Ferreira, Isabel C.F.R.Soil salinization is an increasing problem for many areas throughout the world that renders prohibitive vegetables and crop production in general. In the present study, Cichorium spinosum L. plants were grown under saline conditions in order to evaluate chemical composition and bioactive compounds content of their leaves. Salinity increase resulted in significant changes of macro and micro-nutrients content (nutritional value, sugars, fatty acids, minerals, ascorbic acid and tocopherols), whereas the concentration of phenolic compounds was not significantly affected. Chicoric and 5-O-caffeoylquinic acid were the most abundant phenolic acids. In contrast, antioxidant activity and mineral composition were beneficially affected by mid-to-high and high salinity levels. In conclusion, C. spinosum can be cultivated under saline conditions without compromising the quality of the final product, especially in semi-arid areas where irrigation water is scarce and/or of low quality due to high content of NaCl (coastal areas or areas where underground water is saline).