Bioactive compounds in Latvian wild edible mushroom Boletus edulis
2011
Kuka, M., Latvia Univ. of Agriculture, Jelgava (Latvia) | Cakste, I., Latvia Univ. of Agriculture, Jelgava (Latvia)
Considering the interest for mushrooms and the demand to search for natural antioxidants and other sources of bioactive-compounds, the aim of this study was to investigate the content of bioactive compounds of two widely used wild edible mushrooms Boletus edulis f. beticola and Boletus edulis f. pinicola collected at Jelgava and Riga regions in Latvia. Ash amount was determined to characterize the mineral content; protein was determined by Lowry method (325–526 mg gE-1 of dried mushrooms). Using HPLC the phenolic compounds like gallic acid, caffeic acid, catechin, epicatechin and rutin were detected and quantified. β-carotene and lycopene were determined. DPPH assay was used to evaluate free radical-scavenging activity. In water extracts titratable acidity (0.22–0.26 mmol of NaOH per g of dry mushroom matter) and formol number (0.74–1.40 mmol NaOH per g of dry mushroom matter) were determined. The total content of phenols (TP) as determined by Folin-Ciocalteu assay was higher in the water extracts (11.2–12.5 mg of gallic acid equivalents GAE per 1 g of dry mushroom matter) than in methanol extracts (7.3–8.0 mg of GAE per 1 g of dry mushroom matter). The total content of flavonoids (TF) was higher in the water extracts (0.33–0.37 mg of QE per 1 g of dry mushroom matter) than in methanol extracts (0.13 mg of quercetin equivalents QE per 1 g of dry mushroom matter).
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