4.7 Article

Identification and quantification of phenolic compounds in kernels, oil and bagasse pellets of common walnut (Juglans regia L.)

期刊

FOOD RESEARCH INTERNATIONAL
卷 67, 期 -, 页码 255-263

出版社

ELSEVIER
DOI: 10.1016/j.foodres.2014.11.016

关键词

HPLC-MS; Total phenolic content; DPPH; Hydrolysable tannins; Flavanols; Hydroxycinnamic acids; Hydroxybenzoic acids

资金

  1. European Social Fund (European Union)
  2. Ministry of Education, Science and Sport
  3. Slovenian Research Agency (ARRS) [P4-0013-0481]

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Individual phenolic compounds, total phenolic content and antioxidant potential were assessed in kernels, oils and bagasse pellets (residues of oil pressing) of different walnut cultivars. Twenty-seven phenolic compounds were detected in kernels and pellets conducting high-performance liquid chromatography-tandem mass spectrometry. The main polyphenolic subclass comprised hydrolysable tannins, which accounted approximately 60.80% (kernels) and 61.66% (pellets) of the total phenolics identified (TPI). Walnut oil was poor in phenolics and contained only six different compounds but due to their low content (from 0.15 to 1.44 mu g g(-1)) jost two compounds have been identified. Glansreginin A and glansreginin B were detected in all analyzed walnut products. A comparison of average amount of total phenolic content revealed that walnut oil contains as much as 154 fold less phenolics (0.05 mg GAE g(-1) FW) compared to kernels (7.7 mg GAE g(-1) FIN) or pellets (7.9 mg GAE g(-1) FIN). (C) 2014 Elsevier Ltd. All rights reserved.

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