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Open AccessArticle

Antioxidant, Angiotensin-Converting Enzyme Inhibitory Properties and Blood-Pressure-Lowering Effect of Rice Bran Protein Hydrolysates

1
Laboratório de Tecnologia de Alimentos, Escola de Química e Alimentos, Universidade Federal do Rio Grande, Rio Grande 96.203-900, Brasil
2
Departamento de Bioactividad y Análisis de Alimentos, Instituto de Investigación en Ciencia de Alimentación (CIAL, CSIC-UAM), 28049 Madrid, Spain
3
Grupo de Investigación en Biotecnología Alimentaria, Universidad Francisco de Vitoria, 28223 Madrid, Spain
4
Departamento de Farmacología, Facultad de Medicina, Universidad Complutense de Madrid, 28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Foods 2020, 9(6), 812; https://doi.org/10.3390/foods9060812
Received: 18 May 2020 / Revised: 11 June 2020 / Accepted: 12 June 2020 / Published: 20 June 2020
(This article belongs to the Special Issue Climate Changes and Global Warming—the Future of Foods)
This research aimed to investigate the biological properties of different hydrolysates derived from industrial and laboratory defatted rice bran proteins. Industrial and laboratory defatted rice bran protein concentrates were hydrolyzed with alcalase or flavorzyme. The degree of hydrolysis (DH), oxygen radical absorbance capacity (ORAC), reducing power, total phenolic compounds (TPC), and angiotensin-converting enzyme (ACE) inhibitory activity, were determined in the hydrolysates and the molecular fractions lower than 3 kDa. Systolic blood pressure (SBP) was measured using the tail-cuff method before and after oral administration of 80 mg/kg of different rice bran protein hydrolysate (RBPH) fractions lower than 3 kDa in male spontaneously hypertensive rats (SHR) and normotensive Wistar–Kyoto (WKY) rats. The highest values of in vitro antioxidant activity and TPC were observed in RBPH with alcalase defatted by industry (RBPH2A), and, in all cases, these bioactivities were higher in the molecular fractions lower than 3 kDa. Once again, fractions lower than 3 kDa obtained with alcalase showed a potent ACE inhibitory activity (RBPH1A<3 and RBPH2A<3). The administration of RBPH1A<3 caused a significant decrease in the SBP in SHR, where the maximum decrease was reached at 8 h after administration. SBP in WKY rats was not modified after the administration of RBPH1A<3. These results suggest that the rice bran protein hydrolysates obtained from industry after treatment with alcalase could be an interesting source of bioactive peptides, with potential action on hypertension and other related pathologies. View Full-Text
Keywords: defatted rice bran; antioxidant hydrolysates; antihypertensive activity; bioactive compounds; hypertensive rats defatted rice bran; antioxidant hydrolysates; antihypertensive activity; bioactive compounds; hypertensive rats
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Piotrowicz, I.B.B.; Garcés-Rimón, M.; Moreno-Fernández, S.; Aleixandre, A.; Salas-Mellado, M.; Miguel-Castro, M. Antioxidant, Angiotensin-Converting Enzyme Inhibitory Properties and Blood-Pressure-Lowering Effect of Rice Bran Protein Hydrolysates. Foods 2020, 9, 812.

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