Using ultrasound technology for the inactivation and thermal sensitization of peroxidase in green coconut water

Author(s)

Rojas, Meliza Lindsay ; Trevilin, Julia Hellmeister ; Funcia, Eduardo dos Santos ; Wilhelms Gut, Jorge Andrey ; Duarte Augusto, Pedro Esteves

• Document type: Journal article
• Source: ULTRASONICS SONOCHEMISTRY; v. 36, p. 173-181, MAY 2017.
• Web of Science Citations: 16

Abstract

Green coconut water has unique nutritional and sensorial qualities. Despite the different technologies already studied, its enzymatic stability is still challenging. This study evaluated the use of ultrasound technology (US) for inactivating/sensitizing coconut water peroxidase (POD). The effect of both US application alone and as a pre-treatment to thermal processing was evaluated. The enzyme activity during US processing was reduced 27% after 30 min (286 W/L, 20 kHz), demonstrating its high resistance. The thermal inactivation was described by the Weibull model under non-isothermal conditions. The enzyme became sensitized to heat after US pre-treatment. Further, the use of US resulted in more uniform heat resistance. The results suggest that US is a good technology for sensitizing enzymes before thermal processing (even for an enzyme with high thermal resistance). Therefore, the use of this technology could decrease the undesirable effects of long times and/or the high temperatures of the conventional thermal processing. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 14/16998-3 - Using the ultrasound technology for improving food processes: mass transfer and thermal processing
• Grantee: Pedro Esteves Duarte Augusto
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/17534-0 - Evaluation of the effects of focused microwave processing on liquid foods
• Grantee: Jorge Andrey Wilhelms Gut
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/25179-6 - Study of enzyme inactivation in the processing of green coconut water by focused microwave technology
• Grantee: Eduardo dos Santos Funcia
• Support Opportunities: Scholarships in Brazil - Master