Journal article Open Access

Recovery of Bioactive Compounds from Hazelnuts and Walnuts Shells: Quantitative–Qualitative Analysis and Chromatographic Purification

René Herrera; Jarl Hemming; Annika Smeds; Oihana Gordobil; Stefan Willför; Jalel Labidi


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    "description": "<p>Hazelnut (HS) and walnut (WS) shells, an abundant by\u2010product of the processing industries of these edible nuts, are traditionally considered as a low\u2010value waste. However, they are a source of valuable compounds with an interesting chemical profile for the chemical and pharmaceutical sectors. In this study, the lipophilic and hydrophilic extracts present in HS and WS were quantified and identified, then the polar fractions were chromatographically separated, and their antioxidant capacity was studied. The experimental work includes the isolation of crude lipophilic and hydrophilic extracts by an accelerated extraction process, chromatographic analysis (gas chromatography\u2010flame ionization (GC\u2010FID), GC\u2010mass spectroscopy (GC\u2010MS), highperformance size\u2010exclusion chromatography (HPSEC), thin\u2010layer chromatography (TLC)), and quantification of the components. In addition, a thorough compositional characterization of the subgroups obtained by flash chromatography and their antioxidant capacity was carried out. The gravimetric concentrations showed different lipophilic/hydrophilic ratios (0.70 for HS and 0.23 for WS), indicating a higher proportion of polar compounds in WS than in HS. Moreover, the lipophilic extracts were principally composed of short\u2010chain fatty acids (stearic, palmitic, and oleic acid), triglycerides, and sterols. The polar fractions were screened by thin\u2010layer chromatography and then separated by flash chromatography, obtaining fractions free of fatty acids and sugar derivatives (97:3 in HS and 95:5 in WS), and mixtures richer in phenolic compounds and flavonoids such as guaiacyl derivatives, quercetin, pinobanksin, and catechin. The most polar fractions presented a higher antioxidant capacity than that of the crude extracts.</p>", 
    "alternate_identifiers": [
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        "scheme": "issn", 
        "identifier": "2218-273X"
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    ], 
    "title": "Recovery of Bioactive Compounds from Hazelnuts and Walnuts Shells: Quantitative\u2013Qualitative Analysis and Chromatographic Purification", 
    "license": {
      "id": "CC-BY-4.0"
    }, 
    "journal": {
      "volume": "10", 
      "issue": "10", 
      "title": "Biomolecules"
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    "keywords": [
      "nutshells", 
      "biowaste valorization", 
      "accelerated extraction", 
      "chromatographic analysis", 
      "fractionation", 
      "phenolic compounds", 
      "antioxidant capacity"
    ], 
    "publication_date": "2020-09-24", 
    "creators": [
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        "affiliation": "InnoRenew CoE; Chemical and Environmental Engineering Department, University of the Basque Country (UPV/EHU)", 
        "name": "Ren\u00e9 Herrera"
      }, 
      {
        "affiliation": "\u00c5bo Akademi University, Process Chemistry Centre", 
        "name": "Jarl Hemming"
      }, 
      {
        "affiliation": "\u00c5bo Akademi University, Process Chemistry Centre", 
        "name": "Annika Smeds"
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      {
        "affiliation": "InnoRenew CoE", 
        "name": "Oihana Gordobil"
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        "orcid": "0000-0001-8071-1184", 
        "affiliation": "\u00c5bo Akademi University, Process Chemistry Centre", 
        "name": "Stefan Willf\u00f6r"
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      {
        "orcid": "0000-0002-8382-9492", 
        "affiliation": "Chemical and Environmental Engineering Department, University of the Basque Country (UPV/EHU)", 
        "name": "Jalel Labidi"
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