Functional and sensory properties of pistachio nuts as affected by cultivar

Abstract

BACKGROUND Modern agriculture allows farmers to choose among different cultivars of the same fruit to fulfill their agronomic needs and consumers' demands; however, there are only a few studies that describe and compare key functional and sensory properties of different pistachio cultivars. The main objective of this study was to compare eight pistachio cultivars by analyzing key functional properties (phenolic compounds, polymeric procyanidins, antioxidant activity, and inhibition of α-amylase and β-glucosidase), aromatic compounds with gas chromatography–mass spectrometry (GC–MS), and by examining their sensory properties with a trained panel.

RESULTS A combination of LC-PDA-MS-QTof (liquid chromatography photodiode array quadrupole time-off flight mass spectrometry) and electrospray ionization was used to determine two phenolic acids, nine flavonols, one anthocyanin, and three flavan-3-ols in pistachio cultivars, with a total concentration ranging from 500 to 6065 mg 100 g−1 dry weight (dw). The total polymeric procyanidins concentrations oscillated between 348 and 5919 mg 100 g−1 dw, (−)-epicatechin being the major monomer contributor. Pinene was the most abundant volatile compound (∼200 mg kg−1 dw), and, in the sensory analysis of samples, 23 sensory attributes were found to differ significantly among the cultivars.

CONCLUSION The cultivar ‘Larnaka’ stood out as having the best functional profile (high polyphenolic content, high antioxidant activity, and high values of α-amylase and β-glucosidase inhibition), and the cultivars ‘Kastel’ and ‘Kerman’ showed the most attractive sensory properties, mainly the most intense flavor. © 2019 Society of Chemical Industry