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Characterization of Pectins Extracted from Different Varieties of Pink/Red and White Grapefruits [ Citrus Paradisi (Macf.)] by Thermal Treatment and Thermosonication
Author(s) -
Cava Enzo L.,
Gerbino Esteban,
Sgroppo Sonia C.,
GómezZavaglia Andrea
Publication year - 2018
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/1750-3841.14183
Subject(s) - citrus paradisi , chemistry , pectin , abts , dpph , food science , fourier transform infrared spectroscopy , differential scanning calorimetry , chromatography , antioxidant , botany , biochemistry , rutaceae , chemical engineering , physics , engineering , biology , thermodynamics
The physical and chemical properties of pectin extracts obtained from different white and pink/red varieties of grapefruit [ Citrus paradisi (Macf.)], using both conventional heating (CHE) and thermosonication (TS), were investigated. The content of galacturonic acid (GalA), degree of esterification (%DM), color and antioxidant capacity were analyzed. Fourier‐Transform Infrared Spectroscopy (FTIR) associated with multivariate analysis enabled a structural comparison among the pectin extracts, and differential scanning calorimetry (DSC) completed a full landscape of the investigated extracts. Pectin extracts obtained by CHE showed mostly higher GalA than those obtained by TS. All the extracts had a high antioxidant capacity, as determined by 2,2 diphenyl 1‐picrylhydrazyl (DPPH * ) and 2,2′‐Azino‐bis(3‐ethylbenzothiazoline‐6‐sulfonic acid) diammonium salt (ABTS * +) assays, and a high correlation with the GalA content. The main differences observed in the FTIR spectra occurred in the 1200 to 900 cm −1 region (differences in GalA). The glass transition temperatures (Tgs) of all extracts were above 85 °C, making them interesting as stabilizing agents for the food industry. Practical Application A wide database for the characterization of pectin extracts from grapefruits was obtained. The relationship between the extraction method and the source of pectins, with the physicochemical and antioxidant properties provided great support for their application in the food industry.