Valorization of hazelnut shells into natural antioxidants by ultrasound-assisted extraction: Process optimization and phenolic composition identification

Bo Yuan, Mei Lu, Kent M. Eskridge, Milford A. Hanna

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1 Citation (Scopus)

Abstract

The objectives of this study were to optimize the ultrasound-assisted extraction for phenolic compounds from hazelnut shells and to quantify the individual phenolics. A central composite design was used to optimize extraction time, acetone concentration, and solid to liquid ratio (S/L), for the maximal yield of phenolic compounds and antioxidant capacities. The optimal conditions were 4.0 hr extraction time, 61% acetone, and 10 g/L S/L for the maximal total phenolic content (TPC, 11.23 mg gallic acid equivalents/g shell); 3.7 hr, 60.5% acetone, and 12.9 g/L for the highest ferric reducing antioxidant power (FRAP, 106.3 µmol Trolox equivalents/g shell); and 4.7 hr, 58.3% acetone, and 10 g/L for the highest DPPH radical scavenging capacity (DRSC, 101.83 µmol Trolox equivalents/g shell). Catechin, epicatechin gallate, and gallic acid were the most abundant phenolic compounds in the hazelnut shells. Ultrasound could be a good tool for accelerated recovery of polyphenols from hazelnut shells. Practical applications: There has been an increasing production and application of hazelnuts globally. As the main byproduct of hazelnut industry, hazelnut hard shells are a good source of high value polyphenols. The optimized process presented here will allow a better understanding in the extraction of polyphenols from hazelnut shells. The results of this study are expected to improve the extraction efficiency of phenolic compounds and to help with the development of industrial extraction processes of natural antioxidants from hazelnut shells and other hard shells of tree nuts.

Original languageEnglish (US)
Article numbere12692
JournalJournal of Food Process Engineering
Volume41
Issue number5
DOIs
StatePublished - Aug 2018

Fingerprint

Corylus
hazelnuts
Antioxidants
hulls
Ultrasonics
Acetone
antioxidants
Polyphenols
Chemical analysis
Gallic Acid
acetone
phenolic compounds
polyphenols
gallic acid
Acids
Catechin
Scavenging
Nuts
Byproducts
industrialization

ASJC Scopus subject areas

  • Food Science
  • Chemical Engineering(all)

Cite this

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title = "Valorization of hazelnut shells into natural antioxidants by ultrasound-assisted extraction: Process optimization and phenolic composition identification",
abstract = "The objectives of this study were to optimize the ultrasound-assisted extraction for phenolic compounds from hazelnut shells and to quantify the individual phenolics. A central composite design was used to optimize extraction time, acetone concentration, and solid to liquid ratio (S/L), for the maximal yield of phenolic compounds and antioxidant capacities. The optimal conditions were 4.0 hr extraction time, 61{\%} acetone, and 10 g/L S/L for the maximal total phenolic content (TPC, 11.23 mg gallic acid equivalents/g shell); 3.7 hr, 60.5{\%} acetone, and 12.9 g/L for the highest ferric reducing antioxidant power (FRAP, 106.3 µmol Trolox equivalents/g shell); and 4.7 hr, 58.3{\%} acetone, and 10 g/L for the highest DPPH radical scavenging capacity (DRSC, 101.83 µmol Trolox equivalents/g shell). Catechin, epicatechin gallate, and gallic acid were the most abundant phenolic compounds in the hazelnut shells. Ultrasound could be a good tool for accelerated recovery of polyphenols from hazelnut shells. Practical applications: There has been an increasing production and application of hazelnuts globally. As the main byproduct of hazelnut industry, hazelnut hard shells are a good source of high value polyphenols. The optimized process presented here will allow a better understanding in the extraction of polyphenols from hazelnut shells. The results of this study are expected to improve the extraction efficiency of phenolic compounds and to help with the development of industrial extraction processes of natural antioxidants from hazelnut shells and other hard shells of tree nuts.",
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T1 - Valorization of hazelnut shells into natural antioxidants by ultrasound-assisted extraction

T2 - Process optimization and phenolic composition identification

AU - Yuan, Bo

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AU - Eskridge, Kent M.

AU - Hanna, Milford A.

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AB - The objectives of this study were to optimize the ultrasound-assisted extraction for phenolic compounds from hazelnut shells and to quantify the individual phenolics. A central composite design was used to optimize extraction time, acetone concentration, and solid to liquid ratio (S/L), for the maximal yield of phenolic compounds and antioxidant capacities. The optimal conditions were 4.0 hr extraction time, 61% acetone, and 10 g/L S/L for the maximal total phenolic content (TPC, 11.23 mg gallic acid equivalents/g shell); 3.7 hr, 60.5% acetone, and 12.9 g/L for the highest ferric reducing antioxidant power (FRAP, 106.3 µmol Trolox equivalents/g shell); and 4.7 hr, 58.3% acetone, and 10 g/L for the highest DPPH radical scavenging capacity (DRSC, 101.83 µmol Trolox equivalents/g shell). Catechin, epicatechin gallate, and gallic acid were the most abundant phenolic compounds in the hazelnut shells. Ultrasound could be a good tool for accelerated recovery of polyphenols from hazelnut shells. Practical applications: There has been an increasing production and application of hazelnuts globally. As the main byproduct of hazelnut industry, hazelnut hard shells are a good source of high value polyphenols. The optimized process presented here will allow a better understanding in the extraction of polyphenols from hazelnut shells. The results of this study are expected to improve the extraction efficiency of phenolic compounds and to help with the development of industrial extraction processes of natural antioxidants from hazelnut shells and other hard shells of tree nuts.

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