Thermoresistometer “Mastia” for microbial heat resistance determinations under controlled conditions of temperature
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AutorPalop Gómez, Alfredo
DepartamentoIngeniería de los Alimentos y del Equipamiento Agrícola
Grupo de investigaciónAgroalimentación
Fecha de publicación2009-06-29
Palabras claveMicrobial heat resistance
Controlled of temperature
The thermoresistometer Mastia consists of a main vessel in which thermal treatments are applied, a motor to enable the homogenisation of the heating medium, a main control unit to control heating, sampling and agitation, an external pressure source and a fraction collector to allow for sampling in short duration experiments. The main control unit consists in a program logic controller (PLC).The main vessel, of 400 ml capacity, is built in stainless steel (8,5 cm outer diameter × 12 cm high) with a screw cap with O-ring. This cap has an agitation shaft with a teflon (PTFE) friction bearing with a propeller, and 8 ports with screw caps to hold: the pressure source (N2); the inoculum injection port with a gas chromatography septum; the sampling tube; a thermocouple (Pt 100) to monitor the temperature during heat treatment; two ports to hold the two branches of the electric heating element; and another two ports to hold the two branches of the coil of the cooling system. Inside the vessel, ...
The thermoresistometer Mastia enables to estimate heat resistance under isothermal and non-isothermal heating conditions as well as more complex heating profiles, like those usually applied in the food industry. Its design allows to work with liquid heating media such as buffers, liquid foods or foods containing small particles. It also allows to inoculate microorganisms or compounds and to obtain samples in order to study the changes on the quantity or the quality of these substances along with the thermal treatment. In this way, the intensity of the thermal treatments applied can be calculated and, as a consequence, the microbiological safety and nutritional quality of the food produces obtained can be estimated. With this technological offer we try to collaborate with licence agreement and comercial agreement with technical assistance.
- Oferta tecnológica 
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