Abstract
The Chilean hazelnut (Gevuina avellana Mol., Proteaceae) is a southern South American nut consumed as a snack and included in different preparations of traditional Chilean cuisine. Recently we described the fatty acid profile, oxylipins, phenolic compounds, as well as the antioxidant capacity. The main compounds of the phenolic-enriched extract were only tentatively identified by spectrometric means. In the present work, we describe the isolation and full characterization of a cyclic dipeptide cyclo(Arg-Trp) and other compounds from the phenolic enriched extracts of the G. avellana cotyledons. Compounds were isolated by means of counter-current chromatography and structures were established by spectroscopic and spectrometric methods. This is the first report on small peptides in G. avellana and adds evidence on the possible beneficial effects of this nut in human health.
Highlights
The Chilean hazelnut (Gevuina avellana Mol., Proteaceae) is a southern South American nut consumed as a snack and included in different preparations of traditional Chilean cuisine
The fatty acid, oxylipin and phenolic compounds in this species have been recently published, and the phenolic-enriched extracts (PEE) of the cotyledons were assessed on enzymes associated with metabolic syndrome[2]
When the PEE was analyzed by HPLC-MS/MS using the negative ionization mode, no ions were detected for peaks c and e, suggesting the occurrence of nitrogen-containing compounds
Summary
The Chilean hazelnut (Gevuina avellana Mol., Proteaceae) is a southern South American nut consumed as a snack and included in different preparations of traditional Chilean cuisine. No information is available on nitrogen-containing compounds from Gevuina avellana other than the amino acids from defatted nut after hydrolysis[5]. The aim of the present study was to isolate and characterize the main nitrogen-containing compound from the PEE of G. avellana cotyledons.
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