Repurposing Hazelnut Waste Products for a Sustainable Economy: A Metabolomic Analysis of Cuticles and Shells to Highlight Their Antioxidant Potential and Inhibitory Activity against Verocytotoxic Escherichia coli

Frazzini, Sara; Zuorro, Antonio; Panseri, Sara; Pavlović, Radmila; Rossi, C.A. Sgoifo; Rossi, Luciana

doi:10.3390/su15043268

Cited by 7 publications

(4 citation statements)

References 41 publications

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“…These properties were experienced with a concentration of extract of 8.45 µg/mL. Antimicrobial activity was also observed for shell and cuticle extract against Escherichia coli O137 strain, probably because of their content of tannins and phenols [110].…”

Section: Hazelnut Shellmentioning

confidence: 78%

“…Phenolic compounds can be extracted with an interesting yield exploiting water as a solvent and thus valorising the waste used as raw material [124]. Hazelnut cuticle extracts were also demonstrated to be effective against a specific E. coli strain [110].…”

Section: Hazelnut Skinmentioning

confidence: 99%

“…Figure 4.Hazelnut by-products and innovative applications described in the literature for each fraction. Shell (fortified food[108], molecules extraction[96,[109][110][111][112][113], and materials[114][115][116][117]); skin (fortified food[118][119][120][121][122][123] and molecules extraction[96,109,110,124]); and oil cake (fortified food[125][126][127]). …”

mentioning

confidence: 99%

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Recent Innovations on the Reuse of Almond and Hazelnut By-Products: A Review

Ollani,

Peano,

Sottile

2024

Sustainability

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Nuts consumption has increased significantly in the last 10 years, especially driven by the stimulated awareness of their possible beneficial health effects. Increased nuts consumption is linked to an obvious accumulation of by-products and waste. With the view of the circular economy, the aim of this review is to analyse the recent and innovative approaches able to valorise the by-products derived from almonds and hazelnuts, two important nut products of the Italian scene, with historical and traditional importance. The most important solutions are concerned with reuse of almond hull, shell, skin, oil cake, and hazelnut shell; skin and oil cake are often considered waste or by-products. Many interesting implications in the feed and food sectors have been detected in the last ten years, aimed at designing innovative materials developed from by-products and extraction of bioactive molecules for different purposes. The perspective chosen to discuss the topic is related to the sustainability of these processes, in terms of both the environment and economy. The circular economy supports a zero-waste approach, which should not also be meant as a zero-cost process in terms of the level of technology that has been partially developed.

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Section: Hazelnut Shellmentioning

confidence: 78%

Section: Hazelnut Skinmentioning

confidence: 99%

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Recent Innovations on the Reuse of Almond and Hazelnut By-Products: A Review

Ollani,

Peano,

Sottile

2024

Sustainability

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“…The development of society worldwide has led to the growing demand to maximize natural resources in a sustainable way, thus the use of waste derived by-products from the agri-food industry has become a key aspect in terms of circular economy (Frazzini et al, 2023). In this sense, during the last decades, certain nut crops such as walnut (Juglans regia L.) and hazelnut (Corylus avellana L.) have generated significant interest due to their shells as main by-products from industry (Manterola-Barroso et al, 2024).…”

Section: Introductionmentioning

confidence: 99%

Total phenolics, oxygen radical absorbance capacity, color and microstructure of walnut and hazelnut shells by-products from southern Chile agro-industry

Manterola-Barroso,

Sánchez,

Scheuermann

et al. 2024

Preprint

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Considerable amounts of agro-industrial by-products are discarded or burnt as fuel every year. However, they can be utilized as a valuable source of fiber, phenolics and other useful compounds such as antioxidants. The profile of beneficial compounds can be affected by genotype, locality, orchard management and productive season, adding or decreasing the bioactive potential of by-products. In this study, hazelnut (Corylus avellana L.) and walnut (Juglans regia L.) nutshells were investigated for their fiber content and antioxidant capacity as valorized by-products for the industry. Determinations (ORAC, TPC and color asses) were performed in hazelnut and walnut orchards located in Southern Chile during three consecutive seasons (2020/21; 2021/22 and 2022/23). Analyses of oxygen radical absorbance capacity (ORAC) in nutshells showed the highest ORAC from both species in the season 2020/21 (3217 µmol TE g1DW for hazelnut shells and 4663 µmol TE g DW1 for walnut shells), while variability in the consecutive seasons was lower for hazelnut than in walnut. Total phenolic content in hazelnut shells was positively correlated with L* (R: 0.883) and E (R: 0.924) during 2020/21 season, also with L* for 2022/23 (R: 0.907). While ORAC was negatively correlated with L* (R: 0.922) in 2021/22. In addition, morphological and structural features of both nutshells examined by Scavenging Electron Microscopy (VP-SEM) and Confocal Scavenging Laser Microscopy (CSLM) revealed differential tissue distribution and accumulation patterns of both cellulose and lignin. On the other hand, photo-colorimetric values were determined for both shells and corresponding seasons, and non-significative differences were found both shells and among seasons Finally, these results provide insight into the physicochemical characteristics of two shell types which should be considered together with antioxidant capacity in their valorization as a residual material.

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