Hydroxypropyl-β-Cyclodextrin as a Green Co-Solvent in the Aqueous Extraction of Polyphenols from Waste Orange Peels

Achillia Lakka,Dimitris P Makris,Stavros Lalas

doi:10.3390/beverages6030050

Achillia Lakka, Dimitris P Makris + Show 1 more

Open Access

https://doi.org/10.3390/beverages6030050

Copy DOI

Journal: Beverages	Publication Date: Aug 10, 2020
Citations: 19	License type: CC BY 4.0

Affiliation: University of Thessaly

Abstract

There is, to-date, an expanding interest concerning the use of cyclodextrins as green food-grade co-solvents in the aqueous extraction of polyphenols, however, data regarding polyphenol extraction from waste orange peels (WOP) are lacking. On this ground, hydroxypropyl β-cyclodextrin (HP-β-CD), a highly water-soluble cyclodextrin, was used to develop a simple and straightforward methodology for the effective recovery of WOP polyphenols. Process optimization by response surface showed that maximum total polyphenol recovery (26.30 ± 1.49 mg gallic acid equivalents g−1 dry mass) could be accomplished with 15 mM HP-β-CD at 40 °C. On the other hand, integration of ultrasonication pretreatment was found unsuitable, as it resulted in reduced polyphenol yield. Examination of solvent acidity indicated that polyphenol extraction may be enhanced at pH 4, but the difference was non-significant (p > 0.05) compared to yields attained at pH 2, 3, and 5. Extraction of WOP polyphenols with HP-β-CD was shown to provide significantly higher hesperidin yield compared to 60% (v/v) aqueous ethanol, which suggested selectivity of HP-β-CD toward this polyphenolic metabolite.

Highlights

Agri-food industry waste represents a highly significant environmental issue and valorization of fruit and vegetable side streams is paramount to establishing sustainable routes of waste management.To-date, waste biomass originating from food industry processing residues is rather undervalorized, being used as a source of fertilizers, fuel, and livestock feeds
The evidence emerged by recent studies on HP-β-CD-aided polyphenol extraction, revealed the importance of its concentration on the extraction performance [19,20,21]
Were excluded from the model, The evidence emerged by recent studies on HP-β-CD-aided polyphenol extraction, revealed its final form was: the importance of its concentration on the extraction performance [19,20,21]

Summary

Introduction

Agri-food industry waste represents a highly significant environmental issue and valorization of fruit and vegetable side streams is paramount to establishing sustainable routes of waste management.To-date, waste biomass originating from food industry processing residues is rather undervalorized, being used as a source of fertilizers, fuel, and livestock feeds. Agri-food industry waste represents a highly significant environmental issue and valorization of fruit and vegetable side streams is paramount to establishing sustainable routes of waste management. Plant-food processing by-products and wastes may be regarded as a prominent potential source for value-added natural products and chemicals [1,2]. At present, both emerging and conventional technologies must be combined in a coordinated manner to allow for an integral management of food processing wastes, thereby minimizing impacts on the environment, and reducing wastage of natural resources. Citrus peel and pulp are the major waste streams of citrus juice processing, accounting for nearly 55–60% of the fresh fruit weight, and it has been estimated that the volume of such wastes may be more than 15 × 106 tons worldwide [4]

Methods

Results

Conclusion