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Radio frequency heating of shell eggs - A prelude.

机译:带壳蛋的射频加热-前奏。

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摘要

Owing to their rich nutritive value, eggs serve as potential hosts to pathogenic microbes like Salmonella enteritidis. Administering heat treatments is the best solution for controlling these pathogens. However, heating affects the quality of the egg due to denaturation of proteins. Therefore a technique which causes minimal changes to the functional properties of the egg protein needs consideration.;In this study, the suitability of Radio frequency (RF) treatments of eggs is evaluated for effectiveness in terms of reducing/eliminating the microbial load. Finite difference time domains (FDTD) and Finite element models (FEM) were developed based on preliminary laboratory trials to simulate the electric field and temperature distribution in the egg components keeping in mind the dielectric properties, shape and composition of in-shell eggs.;Laboratory scale experiments were conducted to determine the dielectric properties of individual egg components followed by an investigation of the heating rates of individual egg components as well as intact in-shell eggs at different electric field strengths, where the electrode voltages are 2.5 kV, 3.5 kV and 4.25 kV with 60 mm spacing between the electrodes. The heating trends were then analyzed to obtain the time required to attain the targeted temperature. Models for calculating the dielectric parameters were presented.;As heat treatments invariably affect the functional properties of eggs the heat induced changes with respect to properties like foam stability, foam density, viscosity and turbidity were studied and compared with the physical properties of raw eggs. RF treated eggs showed minimal changes at lower power levels. However the change in properties was more pronounced at higher power levels. The coagulation taking place within the eggs at higher power levels with a view to assessing the quality of heat treated eggs was studied by means of hyperspectral imaging (400-1700 nm).;The heat treatment process was validated by inoculating egg with a microbial contaminant and treating them in an RF applicator. The results indicated that RF heating may possibly serve as a way to pasteurize the eggs provided the process is improved and optimized to reach the required pasteurization temperature with minimum damage to the functional properties of the egg..
机译:鸡蛋具有丰富的营养价值,可作为肠道沙门氏菌等致病微生物的潜在宿主。进行热处理是控制这些病原体的最佳解决方案。但是,由于蛋白质变性,加热会影响鸡蛋的质量。因此,需要考虑使卵蛋白的功能特性发生最小变化的技术。在本研究中,就减少/消除微生物负荷方面评估了射频(RF)处理卵的适用性。在初步实验室试验的基础上,开发了有限差分时域(FDTD)和有限元模型(FEM),以模拟鸡蛋成分中的电场和温度分布,同时牢记带壳鸡蛋的介电特性,形状和组成。进行了实验室规模的实验,以确定各个蛋组分的介电性能,然后研究各个蛋组分以及完整带壳蛋在不同电场强度下的加热速率,其中电极电压分别为2.5 kV,3.5 kV和4.25 kV,电极之间的间距为60 mm。然后分析加热趋势,以获得达到目标温度所需的时间。提出了计算介电参数的模型。随着热处理对蛋的功能特性的不断影响,研究了热诱导的泡沫稳定性,泡沫密度,粘度和浊度等特性的变化,并将其与生鸡蛋的物理特性进行了比较。射频处理的鸡蛋在较低的功率水平下变化很小。但是,在更高的功率水平下,性能的变化更为明显。为了评估热处理过的鸡蛋的质量,通过高光谱成像(400-1700 nm)研究了在较高功率水平下鸡蛋中发生的凝结。热处理过程通过用微生物污染物接种鸡蛋来验证并在射频施加器中对其进行处理。结果表明,如果对过程进行改进和优化以达到所需的巴氏灭菌温度,并且对鸡蛋的功能特性造成的损害最小,则RF加热可能可以用作对鸡蛋进行巴氏灭菌的一种方法。

著录项

  • 作者

    Kannan, Shrikalaa.;

  • 作者单位

    McGill University (Canada).;

  • 授予单位 McGill University (Canada).;
  • 学科 Agriculture Food Science and Technology.;Engineering Agricultural.
  • 学位 M.Sc.
  • 年度 2012
  • 页码 130 p.
  • 总页数 130
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:42:40

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