AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Authors: NIKOLAOS GOUGOULIAS, ALEXANDROS PAPACHATZIS, IOANNIS VAGELAS, LIVIU GIURGIULESCU, ANASTASIA KARABOULA, DIMITRIOS KALFOUNTZOS.
A study during 36 months, was conducted in a conventional greenhouse (open type) and a geothermal (closed type) of TEI Thessaly to determine the productivity, total phenols content, antioxidant activity and certain qualitative characteristics of hydroponic tomatoes and peppers. At geothermal greenhouse the concentration of total phenols in tomatoes ranged from 151 to 324.5 µg (GAE) /g fresh weight and the antioxidant activity ranged from 3.54 to 3.90 µM (AA) /g fresh weight, while in peppers the total phenols ranged from 597 to 815 µg (GAE) /g fresh weight and the antioxidant activity ranged from 6.3 to 7.2 µM (AA) /g fresh weight. At conventional greenhouse the concentration of total phenols in tomatoes ranged from 163 to 195 µg (GAE) /g fresh weight and the antioxidant activity ranged from 3.3 to 3.9 µM (AA) /g fresh weight, while in peppers the total phenols ranged from 527 to 729 µg (GAE) /g fresh weight and the antioxidant activity ranged from 5.7 to 6.8 µM (AA) /g fresh weight. In tomatoes the yield of the production was higher in the geothermal greenhouse as compared to the conventional greenhouse, while in peppers the yield of the production between of geothermal greenhouse and of conventional greenhouse showed no statistically significant differences.
Keywords: Antioxidant activity FRAP; Hydroponic systems; Peppers; Tomatoes; Total phenols
Published Online: 2016-12
