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Extraction Kinetics of Phenolics from Carob (Ceratonia siliqua L.) Kibbles Using Environmentally Benign Solvents

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Abstract

A series of non-toxic and environmentally benign solvent systems, composed of water/ethanol, acidified with either acetic or citric acid, were tested for their efficiency in extracting polyphenols from dried carob kibbles. The best solvent system (30 % ethanol) was then used in a kinetic study, attempted by deploying non-linear regression. The leaching of polyphenols was found to obey 2nd-order kinetics, while the correlation of the total polyphenol yield at saturation with temperature obeyed a 3-parameter exponential growth model. The highest yield of total polyphenols at saturation was 53.76 mg gallic acid equivalents per gram of dry weight, achieved at 60 °C. The analysis of this extract using liquid chromatography–diode array–mass spectroscopy led to the tentative identification of gallic acid, myricetin 3-O-rhamnoside, quercetin 3-O-rhamnoside and quercetin p-hydroxy benzoyl 3-O-rhamnoside. The detection of the last compound in carob extracts is reported for the first time.

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Abbreviations

dw:

Dry weight

GAE:

Gallic acid equivalents

TP:

Total polyphenols

TRE:

Trolox equivalents

AAR :

Antiradical activity

k :

Extraction rate constant

T:

Temperature (°C)

t :

Time (h)

YTP :

Extraction yield in total polyphenols (mg GAE g−1 dw)

YTP(s) :

Extraction yield in total polyphenols at saturation (mg GAE g−1 dw)

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Correspondence to Dimitris P. Makris.

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Cavdarova, M., Makris, D.P. Extraction Kinetics of Phenolics from Carob (Ceratonia siliqua L.) Kibbles Using Environmentally Benign Solvents. Waste Biomass Valor 5, 773–779 (2014). https://doi.org/10.1007/s12649-014-9298-3

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  • DOI: https://doi.org/10.1007/s12649-014-9298-3

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