1000 resultados para Restrepo Restrepo, Nicanor, 1869-1925


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The effects of the extraction system (50% methanol or 50% methanol pH 2.0), volume/material ratio, temperature, time and extractions with 70% acetone were evaluated in the total phenolic compounds (TPC) extraction and in antioxidant activities (AA) using FRAP and ABTS assays in guava fruit. The best yield was obtained when 0.5 g of guava were extracted first with 20 mL 50% methanol and then four times with 20 mL 70% acetone during 30 min at 50 °C. Among the different trials guava fruit exhibited high levels of AA as well as TPC.

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Etat de collection : 3e s., t. 1 (1867, oct.-déc.) ; t. 3 (1868, juil.-déc.) ; t. 5 (1869, juil.-déc.) ; t. 7 (1870, juil.-août)

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12 x 18 cm

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13 x 21 cm