Aljaž Medič (Author), Jerneja Jakopič (Author), Anita Solar (Author), Metka Hudina (Author), Robert Veberič (Author)

Abstract

The present study was designed to identify and quantify the major phenolic compounds (phenolics) in the inner and outer husks, buds and bark of the Persian walnut, Juglans regia L. A comparison across six different cultivars grown in Slovenia was also carried out: ‘Fernor’, ‘Fernette’, ‘Franquette’, ‘Sava’, ‘Krka’ and ‘Rubina’. A total of 83 compounds were identified, which included 25 naphthoquinones, 15 hydroxycinnamic acids, 8 hydroxybenzoic acids, 13 flavanols, 2 flavones, 1 flavanone and 19 flavonols. For the first time, 38 phenolics in the husks, 57 phenolics in the buds and 29 phenolics in the bark were presented in J. regia within this study. Naphthoquinones were the major phenolics determined, approximately 75% of all analysed phenolics in the inner husk, 85% in the outer husk, 50% in buds and 80% in bark. The highest content of phenolics was found in the walnut buds, followed by the bark, the inner husk and the outer husk. On the basis of these high phenolic contents, walnut husks, buds and bark represented valuable by-products of the walnut tree. These data also show origin-related phenolic contents across the cultivars, and thus these phenolic profiles might serve to define the origins of different walnut cultivars.

Keywords

oreh;Juglans regia;lupina;fenolne spojine;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL BF - Biotechnical Faculty
UDC: 634.1/.7
COBISS: 67153667 Link will open in a new window
ISSN: 2079-7737
Views: 116
Downloads: 41
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Other data

Secondary language: Slovenian
Secondary keywords: oreh;Juglans regia;lupina;fenolne spojine;
Type (COBISS): Article
Pages: str. 1-24
Volume: ǂVol. ǂ10
Issue: ǂiss. ǂ6 (535)
Chronology: 2021
DOI: 10.3390/biology10060535
ID: 14808626