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Performance of a Heating Block System Designed for Studying the Heat Resistance of Bacteria in Foods.

Abstract：

:Knowledge of bacteria's heat resistance is essential for developing effective thermal treatments. Choosing an appropriate test method is important to accurately determine bacteria's heat resistances. Although being a major factor to influence the thermo-tolerance of bacteria, the heating rate in samples cannot be controlled in water or oil bath methods due to main dependence on sample's thermal properties. A heating block system (HBS) was designed to regulate the heating rates in liquid, semi-solid and solid foods using a temperature controller. Distilled water, apple juice, mashed potato, almond powder and beef were selected to evaluate the HBS's performance by experiment and computer simulation. The results showed that the heating rates of 1, 5 and 10 °C/min with final set-point temperatures and holding times could be easily and precisely achieved in five selected food materials. A good agreement in sample central temperature profiles was obtained under various heating rates between experiment and simulation. The experimental and simulated results showed that the HBS could provide a sufficiently uniform heating environment in food samples. The effect of heating rate on bacterial thermal resistance was evaluated with the HBS. The system may hold potential applications for rapid and accurate assessments of bacteria's thermo-tolerances.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kou XX,Li R,Hou LX,Huang Z,Ling B,Wang SJ

doi

10.1038/srep30758

subject

Has Abstract

pub_date

2016-07-28 00:00:00

pages

30758

issn

2045-2322

pii

srep30758

journal_volume

6

pub_type

杂志文章

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