Vitamin C-Gehalt von frischem, tiefgek�hltem und gekochtem Spinat (Spinacia oleracea L.)

1966 ◽  
Vol 131 (1) ◽  
pp. 11-23 ◽  
Author(s):  
Wolfgang Franke
Keyword(s):  
Vitamin C ◽  
Spinacia Oleracea ◽  
Spinacia Oleracea L

scholarly journals The effect of foliar nutrition of spinach (Spinacia oleracea L.) with magnesium salts and urea on gas exchange, leaf yield and quality

2012 ◽  
Vol 63 (1) ◽  
pp. 77-86 ◽  
Author(s):  
Edward Borowski ◽  
Sławomir Michałek
Keyword(s):  
Gas Exchange ◽  
Vitamin C ◽  
Spinacia Oleracea ◽  
Leaf Gas Exchange ◽  
Magnesium Acetate ◽  
Control Treatment ◽  
Foliar Nutrition ◽  
Spinacia Oleracea L ◽  
Leaf Yield ◽  
Magnesium Salts

In a pot experiment conducted in a phytotron, the effectiveness of foliar nutrition of spinach (Spinacia oleracea L.) with different magnesium salts with and without the addition of 0.5% CO(NH<sub>2</sub>)<sub>2</sub> was studied. Magnesium was applied 3 times in the form of solutions of MgSO<sub>4</sub> x 7H<sub>2</sub>O, Mg(NO<sub>3</sub>)<sub>2</sub> x 6H<sub>2</sub>O, MgCl<sub>2</sub> x 6H<sub>2</sub>O, C<sub>4</sub>H<sub>6</sub>O<sub>4</sub>Mg x 4H<sub>2</sub>O, compared to water as the control treatment. The obtained results showed that foliar feeding of spinach with inorganic magnesium salts was an efficient method for supplementing the Mg level in plants during the growing period. But the application of a metalo-organic complex in the form of magnesium acetate (C<sub>4</sub>H<sub>6</sub>O<sub>4</sub>Mg x 4H<sub>2</sub>O) at a concentration of 1.7%, in spite of a similar effect on leaf Mg content, induced phytotoxic symptoms in the form of chlorotic and necrotic spots on the leaves. The application of the solutions of inorganic magnesium salts had a significant effect, resulting in more intensive leaf gas exchange (stomatal conductance, transpiration and photosynthesis) and an increase in leaf yield. Magnesium sulphate affected the abovementioned processes in the most effective way, while magnesium acetate had a negative impact. Foliar feeding of spinach with the magnesium salts resulted in an increased leaf content of protein, chlorophyll, carotenoids, nitrates and proline, but a decrease in vitamin C content. The addition of urea to the applied magnesium salt solutions increased the plant gas exchange rates and the leaf content of protein, chlorophyll, carotenoids, nitrates and proline, but it decreased the content of vitamin C, potassium and magnesium.

Versuche zur präparativen Isolierung pflanzlicher Zellorganellen mittels der trägerfreien, kontinuierlichen Ablenkungselektrophorese

1964 ◽  
Vol 19 (11) ◽  
pp. 1072-1075 ◽  
Author(s):  
K. Hannig ◽  
W. Klofat ◽  
H. Endres
Keyword(s):  
Spinacia Oleracea ◽  
Taraxacum Officinale ◽  
Wird Eine ◽  
Spinacia Oleracea L ◽  
Helianthus Annus

Es wird eine präparative Methode zur Isolierung pflanzlicher Zellbestandteile mittels der trägerfreien, kontinuierlichen Ablenkungselektrophorese nach HANNIG 1, 2 kurz skizziert. Als Versuchsmaterial dienen Blätter von Spinat (Spinacia oleracea L.), Sonnenblumen (Helianthus annus L.) und Löwenzahn (Taraxacum officinale Web.).Die Verteilungskurven werden durch Extinktionsmessung der einzelnen Fraktionen in den Auffanggläschen erhalten. Die Definition der Teilchen erfolgt vorläufig morphologisch durch Anfärben und lichtmikroskopische Prüfung als auch durch elektronenmikroskopische Kontrolle nach vorheriger Präparation nach dem „negativ staining“ Verfahren 3,4 oder Kontrastierung mit Phosphorwolframsäure.Bei der Trennung werden Zellkerne und Zellkernfragmente, ganze Chloroplasten, „Mitochondrien“ und plasmatische Strukturen erhalten.

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