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J Sci Food Agric. 2019 Mar 30;99(5):2494-2503. doi: 10.1002/jsfa.9459. Epub 2018 Dec 9.

Green extraction of mulberry anthocyanin with improved stability using β-cyclodextrin.

Author information

1
Department of Food Science and Nutrition, National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Fuli Institute of Food Science, Zhejiang University, Hangzhou, China.

Abstract

BACKGROUND:

Mulberry anthocyanin is reported to possess various biological activities and it is unstable during extraction or food production. The use of organic solvents for extraction of mulberry anthocyanins may cause environmental pollution and safety concerns. Therefore, the aim of this study was to investigate the effect of a green extraction solvent (cyclodextrin) on the recovery of anthocyanin from mulberry fruits, as well as the thermal stability of anthocyanin.

RESULTS:

β-Cyclodextrin (β-CD) or hydroxypropyl-β-cyclodextrin showed better anthocyanin extraction efficiency than water and ethanol aqueous solution for all tested mulberry cultivars. A molecular docking study indicated that anthocyanin (cyanidin-3-O-glucoside) was encapsulated in the cavity of β-CD, thus enhancing the solubility of anthocyanin. The extraction process was subsequently optimized using a Box-Behnken design. The optimal extraction conditions for anthocyanin and antioxidant activity were found at extraction temperature of 20 °C, extraction time of 44.95 min and β-CD concentration of 45 g L-1 . Furthermore, a degradation kinetic study demonstrated that addition of β-CD could significantly improve the thermal stability of anthocyanin during extraction, with the activation energy of anthocyanin degradation increasing from 63.06 to 76.77 kJ mol-1 .

CONCLUSIONS:

Overall, our study suggests that β-CD is an alternative green extraction solvent for the recovery of anthocyanins, and addition of β-CD may potentially increase the thermal stability of anthocyanin during the extraction, which may give guidance for functional beverage production. © 2018 Society of Chemical Industry.

KEYWORDS:

Box-Behnken design; antioxidant activity; degradation kinetics; molecular docking; mulberry anthocyanin; β-cyclodextrin

PMID:
30379343
DOI:
10.1002/jsfa.9459
[Indexed for MEDLINE]

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