Use of Almond Skins to Improve Nutritional and Functional Properties of Biscuits: An Example of Upcycling

Upcycling food industry by-products has become a topic of interest within the framework of the circular economy, to minimize environmental impact and the waste of resources. This research aimed at verifying the effectiveness of using almond skins, a by-product of the confectionery industry, in the p...

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Published in:Foods Vol. 9; no. 11; p. 1705
Main Authors: Pasqualone, Antonella, Laddomada, Barbara, Boukid, Fatma, Angelis, Davide De, Summo, Carmine
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 20-11-2020
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Abstract Upcycling food industry by-products has become a topic of interest within the framework of the circular economy, to minimize environmental impact and the waste of resources. This research aimed at verifying the effectiveness of using almond skins, a by-product of the confectionery industry, in the preparation of functional biscuits with improved nutritional properties. Almond skins were added at 10 g/100 g (AS10) and 20 g/100 g (AS20) to a wheat flour basis. The protein content was not influenced, whereas lipids and dietary fiber significantly increased ( < 0.05), the latter meeting the requirements for applying "source of fiber" and "high in fiber" claims to AS10 and AS20 biscuits, respectively. The addition of almond skins altered biscuit color, lowering and and increasing , but improved friability. The biscuits showed sensory differences in color, odor and textural descriptors. The total sum of single phenolic compounds, determined by HPLC, was higher ( < 0.05) in AS10 (97.84 µg/g) and AS20 (132.18 µg/g) than in control (73.97 µg/g). The antioxidant activity showed the same trend as the phenolic. The -hydroxy benzoic and protocatechuic acids showed the largest increase. The suggested strategy is a practical example of upcycling when preparing a health-oriented food product.
AbstractList Upcycling food industry by-products has become a topic of interest within the framework of the circular economy, to minimize environmental impact and the waste of resources. This research aimed at verifying the effectiveness of using almond skins, a by-product of the confectionery industry, in the preparation of functional biscuits with improved nutritional properties. Almond skins were added at 10 g/100 g (AS10) and 20 g/100 g (AS20) to a wheat flour basis. The protein content was not influenced, whereas lipids and dietary fiber significantly increased ( < 0.05), the latter meeting the requirements for applying "source of fiber" and "high in fiber" claims to AS10 and AS20 biscuits, respectively. The addition of almond skins altered biscuit color, lowering and and increasing , but improved friability. The biscuits showed sensory differences in color, odor and textural descriptors. The total sum of single phenolic compounds, determined by HPLC, was higher ( < 0.05) in AS10 (97.84 µg/g) and AS20 (132.18 µg/g) than in control (73.97 µg/g). The antioxidant activity showed the same trend as the phenolic. The -hydroxy benzoic and protocatechuic acids showed the largest increase. The suggested strategy is a practical example of upcycling when preparing a health-oriented food product.
Upcycling food industry by-products has become a topic of interest within the framework of the circular economy, to minimize environmental impact and the waste of resources. This research aimed at verifying the effectiveness of using almond skins, a by-product of the confectionery industry, in the preparation of functional biscuits with improved nutritional properties. Almond skins were added at 10 g/100 g (AS10) and 20 g/100 g (AS20) to a wheat flour basis. The protein content was not influenced, whereas lipids and dietary fiber significantly increased (p < 0.05), the latter meeting the requirements for applying “source of fiber” and “high in fiber” claims to AS10 and AS20 biscuits, respectively. The addition of almond skins altered biscuit color, lowering L* and b* and increasing a*, but improved friability. The biscuits showed sensory differences in color, odor and textural descriptors. The total sum of single phenolic compounds, determined by HPLC, was higher (p < 0.05) in AS10 (97.84 µg/g) and AS20 (132.18 µg/g) than in control (73.97 µg/g). The antioxidant activity showed the same trend as the phenolic. The p-hydroxy benzoic and protocatechuic acids showed the largest increase. The suggested strategy is a practical example of upcycling when preparing a health-oriented food product.
Upcycling food industry by-products has become a topic of interest within the framework of the circular economy, to minimize environmental impact and the waste of resources. This research aimed at verifying the effectiveness of using almond skins, a by-product of the confectionery industry, in the preparation of functional biscuits with improved nutritional properties. Almond skins were added at 10 g/100 g (AS10) and 20 g/100 g (AS20) to a wheat flour basis. The protein content was not influenced, whereas lipids and dietary fiber significantly increased (p < 0.05), the latter meeting the requirements for applying "source of fiber" and "high in fiber" claims to AS10 and AS20 biscuits, respectively. The addition of almond skins altered biscuit color, lowering L* and b* and increasing [alpha]*, but improved friability. The biscuits showed sensory differences in color, odor and textural descriptors. The total sum of single phenolic compounds, determined by HPLC, was higher (p < 0.05) in AS10 (97.84 [micro]g/g) and AS20 (132.18 [micro]g/g) than in control (73.97 [micro]g/g). The antioxidant activity showed the same trend as the phenolic. The p-hydroxy benzoic and protocatechuic acids showed the largest increase. The suggested strategy is a practical example of upcycling when preparing a health-oriented food product.
Upcycling food industry by-products has become a topic of interest within the framework of the circular economy, to minimize environmental impact and the waste of resources. This research aimed at verifying the effectiveness of using almond skins, a by-product of the confectionery industry, in the preparation of functional biscuits with improved nutritional properties. Almond skins were added at 10 g/100 g (AS10) and 20 g/100 g (AS20) to a wheat flour basis. The protein content was not influenced, whereas lipids and dietary fiber significantly increased ( p < 0.05), the latter meeting the requirements for applying “source of fiber” and “high in fiber” claims to AS10 and AS20 biscuits, respectively. The addition of almond skins altered biscuit color, lowering L* and b* and increasing a* , but improved friability. The biscuits showed sensory differences in color, odor and textural descriptors. The total sum of single phenolic compounds, determined by HPLC, was higher ( p < 0.05) in AS10 (97.84 µg/g) and AS20 (132.18 µg/g) than in control (73.97 µg/g). The antioxidant activity showed the same trend as the phenolic. The p -hydroxy benzoic and protocatechuic acids showed the largest increase. The suggested strategy is a practical example of upcycling when preparing a health-oriented food product.
Audience Academic
Author Boukid, Fatma
Summo, Carmine
Laddomada, Barbara
Angelis, Davide De
Pasqualone, Antonella
AuthorAffiliation 2 Institute of Sciences of Food Production (ISPA), CNR, via Monteroni, 73100 Lecce, Italy; barbara.laddomada@ispa.cnr.it
1 Department of Soil, Plant and Food Science (DISSPA), University of Bari Aldo Moro, Via Amendola, 165/a, I-70126 Bari, Italy; davide.deangelis@uniba.it (D.D.A.); carmine.summo@uniba.it (C.S.)
3 Institute of Agriculture and Food Research and Technology (IRTA), Food Safety Programme, Food Industry Area, Finca Camps i Armet s/n, 17121 Monells, Catalonia, Spain; fatma.boukid@irta.cat
AuthorAffiliation_xml – name: 1 Department of Soil, Plant and Food Science (DISSPA), University of Bari Aldo Moro, Via Amendola, 165/a, I-70126 Bari, Italy; davide.deangelis@uniba.it (D.D.A.); carmine.summo@uniba.it (C.S.)
– name: 2 Institute of Sciences of Food Production (ISPA), CNR, via Monteroni, 73100 Lecce, Italy; barbara.laddomada@ispa.cnr.it
– name: 3 Institute of Agriculture and Food Research and Technology (IRTA), Food Safety Programme, Food Industry Area, Finca Camps i Armet s/n, 17121 Monells, Catalonia, Spain; fatma.boukid@irta.cat
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  givenname: Antonella
  orcidid: 0000-0001-6675-2203
  surname: Pasqualone
  fullname: Pasqualone, Antonella
  organization: Department of Soil, Plant and Food Science (DISSPA), University of Bari Aldo Moro, Via Amendola, 165/a, I-70126 Bari, Italy
– sequence: 2
  givenname: Barbara
  orcidid: 0000-0002-7492-6039
  surname: Laddomada
  fullname: Laddomada, Barbara
  organization: Institute of Sciences of Food Production (ISPA), CNR, via Monteroni, 73100 Lecce, Italy
– sequence: 3
  givenname: Fatma
  orcidid: 0000-0003-4857-6351
  surname: Boukid
  fullname: Boukid, Fatma
  organization: Institute of Agriculture and Food Research and Technology (IRTA), Food Safety Programme, Food Industry Area, Finca Camps i Armet s/n, 17121 Monells, Catalonia, Spain
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  givenname: Davide De
  orcidid: 0000-0001-6048-9248
  surname: Angelis
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  givenname: Carmine
  orcidid: 0000-0002-2736-7705
  surname: Summo
  fullname: Summo, Carmine
  organization: Department of Soil, Plant and Food Science (DISSPA), University of Bari Aldo Moro, Via Amendola, 165/a, I-70126 Bari, Italy
BackLink https://www.ncbi.nlm.nih.gov/pubmed/33233841$$D View this record in MEDLINE/PubMed
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Issue 11
Keywords by-product
biscuits
fiber
almond skins
phenolic compounds
upcycling
health claims
sensory properties
nutritional composition
Language English
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Snippet Upcycling food industry by-products has become a topic of interest within the framework of the circular economy, to minimize environmental impact and the waste...
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StartPage 1705
SubjectTerms Almond
almond skins
Antioxidants
Biscuits
by-product
Byproducts
Circular economy
Color
Confectionery
Dietary fiber
Environmental impact
fiber
Flour
Food industry
Food processing industry
Food science
Friability
health claims
High-performance liquid chromatography
Impact analysis
Lipids
Liquid chromatography
Nutrient content
Nutritional aspects
Odor
Phenolic compounds
Phenols
Sensory evaluation
upcycling
Wheat
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Title Use of Almond Skins to Improve Nutritional and Functional Properties of Biscuits: An Example of Upcycling
URI https://www.ncbi.nlm.nih.gov/pubmed/33233841
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