Evaluation of barley grass as a potential source of some nutritional substances
Paulickova, I.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic) | Ehrenbergerova, J.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic) | Fiedlerova, V.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic) | Gabrovska, D.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic) | Havlova, P.,Vyzkumny Ustav Pivovarsky a Sladarsky, Brno (Czech Republic) | Holasova, M.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic) | Kopacek, J.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic) | Ouhrabkova, J.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic) | Pinkrova, J.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic) | Rysova, J.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic) | Vaculova, K.,Zemedelsky Vyzkumny Ustav, Kromeriz (Czech Republic) | Winterova, R.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic)
Barley green matter was analysed for the contents of vitamin C, total polyphenols, phenolic compounds, proteins, amino acids and saccharides; the activity of catalase was also determined. The concentrations of vitamin C, total polyphenols and ferulic acid decreased with the age of barley plants, whereas the variety had no pronounced effect. Vitamin C concentrations between 0.107-6.357 g/kg DM, total polyphenols between 17.167-35.559 g/kg DM and ferulic acid between 0-5.916 g/kg DM were found. Catalase activity amounted to 4.5-29.7 TSU. The monosaccharide profile showed high concentrations of glucose (15.40-88.40 g/kg DM) and fructose (37.60-81.40 g/kg DM) which decreased with the plant growth. Saccharose and galactose concentrations were low, ranging between 0-7.70 g/kg DM and 3.70-5.30 g/kg DM, respectively. The total amino acid concentration decreased with the plant age. High concentrations of aspartic (15.232-28.682 g/kg DM) and glutamic acids (16.694-35.526 g/kg DM), as well as minimal concentrations of sulphur amino acids could be noted. The highest catalase activity was found in the early growth phase (18.5-35.1 TSU). The yield of juice pressed out from frozen green matter amounted to 68%. The juice was preserved by fluid drying, freeze drying and freezing. In respect to folates and total polyphenols contents as well as the antioxidant activity, freezing appears the most suitable procedure for preserving.
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