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

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Pinela, J (Author) Other; Prieto, MA (Author) Other; Barreiro, MF (Author) Other; Carvalho, AM (Author) Other; Beatriz B P P Oliveira (Author) FFUP; Vazquez, JA (Author) Other; Ferreira, ICFR (Author) Other

Journal

Title: Food and Bioproducts Processing: Transactions of the Institution of of Chemical Engineers, Part C

Vol. 98

Pages: 283-298

ISSN: 0960-3085

Publisher: Institution of Chemical Engineers

Indexing

ISI Web of Knowledge - 21 Citations

Scopus - 28 Citations

Other information

Authenticus ID: P-00K-95P

DOI: 10.1016/j.fbp.2016.02.002

Abstract (EN): 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 beta-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 degrees C; Et, 99.1%; and S/L, 45.0 g/L for H antioxidants; and t, 15.4 min; T, 60.0 degrees 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16