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Optimization of microwave-assisted extraction of hydrophilic and lipophilic antioxidants from a surplus tomato crop by response surface methodology

Paper ID Volume ID Publish Year Pages File Format Full-Text
18881 43036 2016 16 PDF Available
Title
Optimization of microwave-assisted extraction of hydrophilic and lipophilic antioxidants from a surplus tomato crop by response surface methodology
Abstract

•Optimal MAE conditions for hydrophilic and lipophilic antioxidants were determined.•Time, temperature, ethanol concentration and solid/liquid ratio were relevant variables.•Concentration-time response methods (crocin and β-carotene bleaching) were applied.•The antioxidant capacity of the hydrophilic fraction was higher than the lipophilic one.•No significant difference between predicted and experimental values was found.

Tomato is the second most important vegetable crop worldwide and a rich source of industrially interesting antioxidants. Hence, the microwave-assisted extraction of hydrophilic (H) and lipophilic (L) antioxidants from a surplus tomato crop was optimized using response surface methodology. The relevant independent variables were temperature (T), extraction time (t), ethanol concentration (Et) and solid/liquid ratio (S/L). The concentration-time response methods of crocin and β-carotene bleaching were applied, since they are suitable in vitro assays to evaluate the antioxidant activity of H and L matrices, respectively. The optimum operating conditions that maximized the extraction were as follows: t, 2.25 min; T, 149.2 °C; Et, 99.1%; and S/L, 45.0 g/L for H antioxidants; and t, 15.4 min; T, 60.0 °C; Et, 33.0%; and S/L, 15.0 g/L for L antioxidants. This industrial approach indicated that surplus tomatoes possess a high content of antioxidants, offering an alternative source for obtaining natural value-added compounds. Additionally, by testing the relationship between the polarity of the extraction solvent and the antioxidant activity of the extracts in H and L media (polarity–activity relationship), useful information for the study of complex natural extracts containing components with variable degrees of polarity was obtained.

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Keywords
Lycopersicon esculentum; Microwave-assisted extraction; β-Carotene/crocin bleaching assay; Concentration-time response modelling; Central composite design; Response surface methodology
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 98, April 2016, Pages 283–298
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us