Computer modelling for the control of particulate sterilization under dynamic flow conditions

A sterilisation Time–Temperature Integrator based on amylase from the hyperthermophilic organism Pyrococcus furiosus

“…Models such as Ball (1923), Stumbo (1953), NumeriCAL (FMC Inc., USA) or CTemp (Tucker, Noronha, & Heydon, 1996) predict the required process conditions to achieve a desired sterilisation value. • Process models that predict, for example, the temperaturetime history of the critical food particles as they travel through the heating, holding and cooling zones of the process (Heppell, 1985;Lee, Singh, & Larkin, 1990;McKenna & Tucker, 1991;Sastry, 1986).…”

Optimal Sterilization Temperatures for Conduction Heating Foods Considering Finite Surface Heat Transfer Coefficients

“…11). Optimum T, was calculated to within O.l"C. Optimum 160 < Th < 100°C were excluded (Hendrickx et al, 1990;Banga et al, 1991;Mckenna and Tucker, 1990). (Table 4).…”

“…A negligible surface resistance may be assumed to be valid only when condensing steam is used to heat foods in metal containers (Tucker and Holdsworth, 1991). To model the product temperature distribution during processing with water (e.g., during cooling), steam/air mixtures processing of foods in glass or plastic containers or processing of liquid/ particle mixtures it is necessary to consider a finite surface heat transfer coefficient (Heldman and Singh, 1981;Ramaswamy et al, 1983;Tung et al, 1984;Bhowmik and Tandon, 1987;Deniston et al, 1987;Lebowitz and Bhowmik, 1989;Tucker and Clark, 1990;Shin and Bhowmik, 1990;Tucker and Holdsworth, 1990;Zuritz et al, 1990;Stoforos and Merson, 1990;Mckenna and Tucker, 1990;Deniston et al, 1991).…”

“…Thijssen et al (1978) calculated optimal sterilization conditions, maximizing overall quality retention, for conduction heating packaged foods and corrected for Biot numbers greater than 10. Tucker andHoldsworth (1990, 1991) calculated optimal sterilization temperatures for products in plastic rectangular containers (trays) which considered thermal resistance of the plastic material, surface heat transfer coefficient and headspace gases. Hendrick et al (1990) developed regression equations for optimal temperatures based on minimum quality and nutrient degradation at the surface.…”

Application of a novel enzymatic sterilisation Time Temperature integrator

“…• Mathematical process models that predict, for example, the temperature-time history of the critical food during a process (Sastry, 1986;McKenna and Tucker, 1991).…”