The phytochemical rich potential of acorn (Quercus aegilops) products and by products
2018
Vassiliki T. Papoti, Alexander Technological Educational Institute of Thessaloniki, Thessaloniki, Greece | Nikoleta Kizaki, Alexander Technological Educational Institute of Thessaloniki, Thessaloniki, Greece | Alexia Skaltsi, Alexander Technological Educational Institute of Thessaloniki, Thessaloniki, Greece | Panayotis D. Karayannakidis, Alexander Technological Educational Institute of Thessaloniki, Thessaloniki, Greece | Maria Papageorgiou, Alexander Technological Educational Institute of Thessaloniki, Thessaloniki, Greece
The phytochemical content of acorn (Quercus aegilops) products (nuts and flour) and by products (shells and leaching waters) regarding their content in total phenols, fatty acids, sodium, potassium and calcium was investigated. Antioxidant activity was also examined. Acorn materials presented high total phenol content (up to 47.6 ± 0.6 mg gallic acid equivalents (GAE)/g dry material), with a substantial amount remaining after leaching (11.6 ± 0.7 mg GAE/g flour), and high DPPH radical scavenging and ferric reducing activity. Their content in potassium, calcium, oleic and linoleic acids was considered significant. Molecular weight distribution of proteins and peptides was also studied and found between 7 and 45 kDa; only for acorn shells a band greater than 250 kDa appeared. Leaching parameters (time, material size, material to water ratio, temperature, NaCl presence) significantly affected the phytochemical content of the remained leached material.
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