Abstract
The aim of the study was to assess whether an extra fertilization with manganese, commercial fertilizer Alkalin (N, K and Si), and combined treatment (manganese + Alkalin) affect the chemical composition of chokeberry fruits (Aronia melanocarpa (Michx) Elliot), especially sugar content and the quantity and profile of phenolics. Dry weight, soluble solids, titratable acidity, total sugar, reducing sugar, sucrose, vitamin C, total polyphenol (gallic acid equivalents); 2, 2-diphenyl-1-picrylhydrazyl radical scavenging activity; and phenolics profile were measured from the fruits harvested from different treatments. Chokeberries treated with manganese showed high content of non-identified phenolic acids [101.15 mg per 100 g fresh weight (FW), these compounds were not detected in fruit treated with Alkalin and manganese + Alkalin], and the highest content of cyanidin glycosides (813.75 mg per 100 g FW). The fruits treated with Alkalin displayed the highest content of quercetin derivatives (40.88 mg per 100 g FW) and eriodictyol 7-glucuronide (26.43 mg per 100g FW). Chokeberries in control treatments had the highest content of dry weight (30.76% FW), soluble solids (24.1% FW), total sugar (20.92% FW), vitamin C (8.4 mg 100 g1 FW), total polyphenol (2377.1 mg gallic acid equivalents per 100 g FW), the highest 2, 2-diphenyl-1-picrylhydrazyl radical % inhibition (38.1%), highest content of chlorogenic acids (210.38 mg per 100 g FW), (-)epicatechin (32.18 mg per 100 g FW) and the highest degree of procyanidin polimerization (59). The results indicate that applied fertilization exerted differential influence on chemical composition of aronia fruits.;
Highlights
Poland aronia shrubs meant for fruit production were introduced in the 1970s
In 2005, Valcheva-Kuzmanova et al investigated the effect of aronia juice pretreatment on indomethacin-induced gastric mucosal damage
Chokeberry fruits were obtained from the Experimental Station at Rajkowo near Szczecin, northwest Poland
Summary
Poland aronia shrubs meant for fruit production were introduced in the 1970s. Chokeberries are rich in phenolic compounds and have been reported to have antioxidative effects in vitro and in vivo. Elliot) belongs to the Rosaceae family and is native to eastern North America (Jeppsson 2000). Mi et al (2005) noted an anti-inflamatory effect of aronia crude extract on endotoxin-induced uveitis in rats. Valcheva-Kuzmanova et al (2004) studied the influence of the natural aronia juice on carbon tetrachloride (CCl4)-induced acute liver damage in rats. Chokeberry juice in a dose-dependent manner reduced necrotic changes in rat livers and inhibited the increase of plasma aspartate transaminase and alanine transaminase activities, induced by CCl4. In 2005, Valcheva-Kuzmanova et al investigated the effect of aronia juice pretreatment on indomethacin-induced gastric mucosal damage
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