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Molecules 2017, 22(8), 1344; doi:10.3390/molecules22081344

Fenton Discoloration of Ultrasonicated Purple Cactus Pear Juice

1
Centro de Investigación Interdisciplinario, Área Académica de Nutrición, Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Circuito Actopan-Tilcuautla s/n, Ex hacienda La Concepción, San Agustín Tlaxiaca, Hidalgo 42160, Mexico
2
Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Km 4.5 Carretera Pachuca-Tulancingo, Mineral de la Reforma, Hidalgo 42184, Mexico
*
Author to whom correspondence should be addressed.
Received: 30 June 2017 / Revised: 31 July 2017 / Accepted: 9 August 2017 / Published: 15 August 2017
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Abstract

The aim of this study was to evaluate the stability of color, betaxanthin, and betacyanin pigments in the presence of Cu(II)-dependent hydroxyl radicals (HO•) from ultrasonicated purple cactus pear juice at amplitudes of 40%, 60%, and 80%, in comparison to untreated sample. L* parameter of juice treated at 40% and 80% amplitude for 25 and 15 min, respectively (11.3 and 9.3, respectively), were significantly higher compared to the control; b* and hue parameters of juice treated at 80%, 25 min showed values of 1.7 and 0.1, respectively. Color differences (ΔE) were lower (<3) for juices treated at high amplitude (80%) and short times (3–5 min). Juice treated at 40% 15 min, 60% 25 min, 80% 15 and 25 min presented high values of betacyanins (281.7 mg·L−1, 255.9 mg·L−1, 294.4 mg·L−1, and 276.7 mg·L−1, respectively). Betaxanthin values were higher in the juices treated at 40% 5 min and 80% 15 and 25 min (154.2 mg·L−1, 135.2 mg·L−1, and 128.5 mg·L−1, respectively). Purple cactus pear juice exhibited significant chelating activity of copper ions and great stability when exposed to HO•. View Full-Text
Keywords: cactus pear; juice; ultrasound; color; betalains; Fenton reaction cactus pear; juice; ultrasound; color; betalains; Fenton reaction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Reyes-Hernández, I.; Cruz-Cansino, N.S.; Santander-Martínez, I.R.; Alanís-García, E.; Delgado-Olivares, L.; Ramírez-Moreno, E.; Ariza-Ortega, J.A.; Omaña-Covarrubias, A.; Torres-Valencia, J.M.; Manríquez-Torres, J.J. Fenton Discoloration of Ultrasonicated Purple Cactus Pear Juice. Molecules 2017, 22, 1344.

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