@misc{10481/73380,
year = {2022},
month = {1},
url = {http://hdl.handle.net/10481/73380},
abstract = {“Horchata” is a well-known Spanish beverage obtained from pressing tiger nuts. Its
by-product is a potential source of sugar and fiber but also contains polyphenols; thus, it could be
used as a new ingredient in the food industry. The aim of this work is to determine the phenolic
compounds and compare the phenolic profile of two tiger nut by-products. A Box–Behnken design
has been carried out to optimize the extraction of phenolic compounds from tiger nut by-products
by ultrasound technology. The independent factors were time (min), ethanol/water (% v/v), and
solvent/sample ratio (v/w). The model was validated and confirmed by ANOVA. A Protected
Designation of Origin (PDO) of Valencia and a non-Protected Designation of Origin (n-PDO) tiger
nut by-products were extracted under the optimal conditions and were characterized by HPLC-DADESI-
TOF-MS (High Performance Liquid Chropatography coupled to a photodiode array time-offlight
mass detector). Moreover, their antioxidant activities measured by three different methods
(DPPH (2,2-diphenyl-1-picrylhydrazyl), ABTS (2,20-Azinobis [3-ethylbenzothiazoline-6-sulfonic acid]-
diammonium salt) and FRAP (ferric reducing antioxidant power)) were compared. A total of 45 polar
compounds were identified, and the phenolic ones were quantified, some of them for the first
time. PDO tiger nut by-product has been demonstrated to be richer in phenolic acids and other
polyphenols and has higher antioxidant activity; meanwhile, n-PDO tiger nut by-product is richer in
phenol precursors.},
publisher = {MDPI},
keywords = {Ultrasound-assisted extraction},
keywords = {Phenolic compounds},
keywords = {Antioxidant activity},
keywords = {Chufa},
keywords = {HPLC-ESI-TOF-MS},
title = {New Advances in the Phenolic Composition of Tiger Nut (Cyperus esculentus L.) By-Products},
doi = {10.3390/foods11030343},
author = {Razola Díaz, María del Carmen and Gómez Caravaca, Ana María and Guerra Hernández, Eduardo Jesús and García Villanova Ruiz, Belén and Verardo, Vito},
}