| Grant number: | 14/17534-0 |
| Support Opportunities: | Regular Research Grants |
| Start date: | November 01, 2014 |
| End date: | April 30, 2017 |
| Field of knowledge: | Agronomical Sciences - Food Science and Technology - Food Engineering |
| Principal Investigator: | Jorge Andrey Wilhelms Gut |
| Grantee: | Jorge Andrey Wilhelms Gut |
| Host Institution: | Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil |
| City of the host institution: | São Paulo |
| Associated researchers: | Carmen Cecilia Tadini |
Abstract
Continuous thermal processing of liquid foods by focused microwaves is an emerging and promising technology that provides advantages over conventional heating using heat exchangers (fast volumetric heating, lower surface temperature and non-thermal effects on enzyme inactivation) that allow obtaining a safe product with high quality and commercial potential in domestic and foreign markets. The objective in this research is to study the effects of focused microwaves on the enzymatic activity of polyphenol oxidase (PPO), pectinesterase (PE) and peroxidase (POD) in selected liquid foods (green coconut water, orange juice and apple juice) and standardized media with a view to determining relevant kinetic models for the design of production processes. A microwave focused reactor operating at 2,450 MHz with power and temperature control will be used for the treatment of the samples and kinetic models will be adjusted by simultaneously integrating the real temperature histories in a nonlinear unconstrained optimization problem, avoiding the use of simplifying assumptions that compromise the quality of the adjust. The results will be evaluated based on their reliability and applicability and will allow the determination of optimal processing conditions and quantify possible non-thermal effect of microwaves. It is considered that this project will contribute to the development of this innovative technology enabling the transfer of academic knowledge into practical applications that benefit the country. (AU)
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