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Organic acids composition of Cydonia oblonga Miller leaf

Organic acid profiles of 36 Cydonia oblonga Miller leaf samples, from three different geographical origins of northern (Bragança and Carrazeda de Ansiães) and central Portugal (Covilhã), harvested in three collection months (June, August and October of 2006), were determined by HPLC/UV (214 nm). Quince leaves presented a common organic acid profile, composed of six constituents: oxalic, citric, malic, quinic, s...

Inflorescences of Brassicacea species as source of bioactive compounds: a compa...

Two Brassica oleracea varieties (B. oleracea L. var. costata DC and B. oleracea L. var. acephala) and Brassica rapa L. var. rapa inflorescences were studied for their chemical composition and antioxidant capacity. Phenolic compounds and organic acids profiles were determined by HPLC–DAD and HPLC–UV, respectively. B. oleracea var. costata and B. oleracea L. var. acephala inflorescences presented a similar qualit...

Multivariate analysis of of Tronchuda Cabbage (Brassica oleracea L. var. costat...

A field experiment was carried out to investigate the effect of fertilization level on the phenolic composition of tronchuda cabbage (Brassica oleracea L. var. costata DC) external and internal leaves. Eight different plots were constituted: a control without fertilization, one with organic matter, and six experiments with conventional fertilizers (nitrogen, boron, and sulfur, two levels each). The phenolic com...

Do cultivar, geographical location and crop season influence phenolic profile o...

Walnut leaves from nine different cultivars (Arco, Franquette, Hartley, Lara, Marbot, Mayette, Meylannaise, Parisienne and Rego) were studied for their phenolic compounds. Samples were harvested along three consecutive years, at two different geographical locations, in order to evaluate if significant differences in the phenolics composition can be related with genetic, climatic or geographical factors. Nine co...

Rumex induratus leaves: phytochemical profiling and antioxidant activity

Several species of the Rumex (Polygonaceae) genus have been used in traditional medicine, although their high oxalic acid content has been implicated in oxalic intoxication, mainly la children. Rumex induratus Boiss & Reuter is an endemic Liberian herb that prefers rocky habitats of the thermo Mediterranean region.

Comparative study of phytochemicals and antioxidant potential of wild edible mu...

A comparative study of the organic acids and phenolics composition and of the total alkaloids content of entire wild edible mushrooms (Russula cyanoxantha, Amanita rubescens, Suillus granulatus and Boletus edulis) and correspondent caps and stipes was performed. All species presented oxalic, citric, malic and fumaric acids, with A. rubescens exhibiting the highest total organic acids content. Organic acids were...

Leucopaxillus giganteus mycelium: effect of nitrogen source on organic acids an...

ln order to study the influence 01 lour inorganic nitrogen sources (NH4N03, NaN02, KN03 and (NH4)2HP04) on the chemical composition 01 Leucopaxillus giganteus mushroom mycelium, its organic acids profile was determined by HPLC-UV and total alkaloids content was assessed by a spectrophotometric method, alter precipitation by Dragendorlf's reagent. lhe results showed that L. giganteus presented an organic acids p...

Walnut as a potential natural anticholesterolaemic and a source of antioxidant...

The frequent nut intake has been associated with lower rates of cardiovascular diseases in several large cohorts observational studies and with a consistent hypocholesterolaemic effect in numerous controlled short-term nut feeding trials [1]. The reduction of total and low-density lipoprotein (LDL) cholesterol observed in those studies, has been attributed both to the high contents of monounsaturated (MUFA) and...

Aroma compounds in eleven edible mushroom species: relationship between volatil...

Antioxidant potential and relation with chemical composition of wild edible mus...