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Part of the book series: Environmental Chemistry for a Sustainable World ((ECSW,volume 17))

Abstract

There is a growing interest for the aromatic and biological properties of essential oils, as alternatives to synthetic chemicals. Nonetheless, essential oils and their components are poorly soluble in water, and are highly sensitive to degradation and evaporation. Encapsulation in cyclodextrins can reduce these drawbacks and improve the properties of essential oils. Cyclodextrins are non-toxic cyclic oligosaccharides obtained by enzymatic degradation of starch. Cyclodextrins inclusion complexes find applications in the food, pharmaceutical and cosmetic industries.

This chapter reviews encapsulation of essential oils in cyclodextrins. The strength of binding between cyclodextrins and essential oils components covers a wide range of formation constants with values ranging from 13 to 166,338 M−1. The encapsulation in cyclodextrins increases the aqueous solubility of essential oils up to 16-fold and reduces oil photodegradation rates up to 44-fold, while ensuring gradual release of oils. This chapter also discusses the effect of encapsulation on biological activities such as antimicrobial and antioxidant properties of essential oils. Biological effects depend on the nature and concentrations of essential oils and cyclodextrin, the tested microorganism, and other factors. Emerging cyclodextrin-based approaches for textiles and nanofibers are also discussed.

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Notes

  1. 1.

    FDA: Code Fed. Regul. (CFR). Title 21 Food Drugs. Chapter I – Food Drug Adm. Dep. Heal. Hum. Serv. Subchapter B – Food Hum. Consum. (Continued), Part 182–Subst. Gen. Recognized as Safe (GRAS). 2016.

  2. 2.

    Essential Oil Market Analysis By Product (Orange, Corn Mint, Eucalyptus, Citronella, Peppermint, Lemon, Clove Leaf, Lime, Spearmint), By Application (Medical, Food & Beverage, Spa & Relaxation, Cleaning & Home) And Segment Forecasts To 2024.

  3. 3.

    Vraz Kresevic S, Voncina B, Gersak J. Insect resistant and eco-friendly textile materials. In: Dragcevic Zvonko (ed.): 4th International Textile, Clothing & Design Conference: Magic world of textiles : book of proceedings, ITC&DC, 05-08 October, 2008, Dubrovnik, Croatia. Zagreb: Faculty of Textile Technology, University of Zagreb; 2008.

Abbreviations

CD:

Cyclodextrin

CRYSMEB:

Low methylated-β-cyclodextrin

EO:

Essential oil

HP-β-CD:

Hydroxypropyl-β-cyclodextrin

HPLC:

High performance liquid chromatography

IC50:

Half maximal inhibitory concentration

ITC:

Isothermal titration calorimetry

LD50:

Median lethal dose

MBC:

Minimal bactericidal concentration

MHE:

Multiple headspace extraction

MIC:

Minimum inhibitory concentration

NMR:

Nuclear magnetic resonance

RAMEB:

Randomly methylated-β-cyclodextrin

SH-GC:

Static headspace-gas chromatography

TG:

Thermogravimetry

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Acknowledgments

Authors thank Marc Fourmentin from the university of the Littoral Opal Coast (ULCO), France for the illustrations.

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Kfoury, M., Auezova, L., Greige-Gerges, H., Fourmentin, S. (2018). Cyclodextrins for Essential Oils Applications. In: Fourmentin, S., Crini, G., Lichtfouse, E. (eds) Cyclodextrin Applications in Medicine, Food, Environment and Liquid Crystals. Environmental Chemistry for a Sustainable World, vol 17. Springer, Cham. https://doi.org/10.1007/978-3-319-76162-6_4

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