Soluble and insoluble-bound phenolics and antioxidant activity of various industrial plant wastes

Zehra Gulsunoglu; Funda Karbancioglu-Guler; Katleen Raes; Meral Kilic-Akyilmaz

doi:10.1080/10942912.2019.1656233

Soluble and insoluble-bound phenolics and antioxidant activity of various industrial plant wastes

Zehra Gulsunoglu, Funda Karbancioglu-Guler, Katleen Raes, Meral Kilic-Akyilmaz^*

^*Corresponding author for this work

Department of Food Engineering

Research output: Contribution to journal › Article › peer-review

71 Citations (Scopus)

Abstract

The potential of selected industrial food wastes from juice and nut production including apple peel, apple pomace, pomegranate peel, pomegranate seed, chestnut shell, and black carrot pomace as resources for natural antioxidants was investigated. Soluble free and insoluble-bound phenolics were extracted from the wastes and analyzed for total phenolic and flavonoid contents, phenolic profile and antioxidant activity. Total phenolic and total flavonoid contents of wastes were positively correlated with their antioxidant activity. The highest total phenolic and antioxidant activity were determined in soluble fraction of pomegranate peel due to a significant amount of punicalagin derivatives. Pomegranate peel and seed had the most phenolics and flavonoids in soluble form while other wastes had more than 45% of total phenolics in insoluble-bound form. Chestnut shell showed more antioxidant activity in insoluble-bound fraction compared to that of its soluble fraction. These findings showed that not only soluble but also an insoluble-bound fraction of the industrial wastes has good potential for valorization as a source of natural antioxidants.

Original language	English
Pages (from-to)	1501-1510
Number of pages	10
Journal	International Journal of Food Properties
Volume	22
Issue number	1
DOIs	https://doi.org/10.1080/10942912.2019.1656233
Publication status	Published - 2019

Bibliographical note

Publisher Copyright:
© 2019, © 2019 Zehra Gulsunoglu, Funda Karbancioglu-Guler, Katleen Raes and Meral Kilic-Akyilmaz. Published with license by Taylor & Francis Group, LLC.

Funding

This work was supported by the Istanbul Technical University, Scientific Research Projects Fund [39306]; Authors would like to thank Ghent University for international mobility and cooperation in research. The study was supported by Istanbul Technical University, Scientific Research Projects Fund (BAP Project no: 39306). Authors would like to thank Ghent University for international mobility and cooperation in research. The study was supported by Istanbul Technical University, Scientific Research Projects Fund (BAP Project no: 39306).

Funders	Funder number
Istanbul Technical University, Scientific Research Projects Fund
British Association for Psychopharmacology	39306
Universiteit Gent

Keywords

antioxidant
fruits
Industrial wastes
insoluble-bound phenolics
soluble phenolics

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10.1080/10942912.2019.1656233

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abstract = "The potential of selected industrial food wastes from juice and nut production including apple peel, apple pomace, pomegranate peel, pomegranate seed, chestnut shell, and black carrot pomace as resources for natural antioxidants was investigated. Soluble free and insoluble-bound phenolics were extracted from the wastes and analyzed for total phenolic and flavonoid contents, phenolic profile and antioxidant activity. Total phenolic and total flavonoid contents of wastes were positively correlated with their antioxidant activity. The highest total phenolic and antioxidant activity were determined in soluble fraction of pomegranate peel due to a significant amount of punicalagin derivatives. Pomegranate peel and seed had the most phenolics and flavonoids in soluble form while other wastes had more than 45% of total phenolics in insoluble-bound form. Chestnut shell showed more antioxidant activity in insoluble-bound fraction compared to that of its soluble fraction. These findings showed that not only soluble but also an insoluble-bound fraction of the industrial wastes has good potential for valorization as a source of natural antioxidants.",

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Soluble and insoluble-bound phenolics and antioxidant activity of various industrial plant wastes

Abstract

Bibliographical note

Funding

Keywords

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