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Molecules 2017, 22(8), 1344;

Fenton Discoloration of Ultrasonicated Purple Cactus Pear Juice

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
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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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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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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