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Minimising the between-sample variance in colony counts on foods

机译：减少食物中菌落计数的样本间差异

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摘要

The objective of this study was to assess whether it is possible to minimise the variance in colony counts on replicate target samples of foods by aseptic compositing of the samples or by increasing the quantity of sample examined. The results show that compositing reduces the overall variance, and hence the standard deviation, to very low levels, although in some cases the overall variance remains relatively high, reflecting the heterogeneous distribution of microorganisms in the foods. Increasing the weight of target sample examined (e.g. from 10 g to 100 g) had a pronounced effect on the mean log_(10) colony count and significantly reduced the variance of the mean. The results are discussed in relation to the quantity of sample that is recommended for examination in international and other standards.
机译：这项研究的目的是评估是否可以通过无菌合成样品或增加被检样品的数量来使食品的复制目标样品上的菌落计数差异最小化。结果表明，尽管某些情况下总体差异仍然相对较高，但通过合成可以将总体差异（从而将标准偏差）降低到非常低的水平，这反映了食品中微生物的异质分布。增加所检查目标样品的重量（例如，从10 g增加到100 g）对平均log_（10）菌落计数有明显影响，并显着降低了平均值的方差。讨论的结果与国际和其他标准中建议检查的样品量有关。

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  • 来源
    《Food microbiology》 |2010年第5期|598-603|共6页
  • 作者

    Janet E. L. Corry; Basil Jarvis; Alan J. Hedges;

  • 作者单位

    University of Bristol, Department of Clinical Veterinary Science, Longford, Bristol BS40 5DU, UK;

    Ross Biosciences Ltd, Upton Bishop, Ross-on-Wye, HR9 7UR, UK;

    University of Bristol, Department of Cellular and Molecular Medicine, University Walk, Bristol BS8 1TD, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    colony counts; foods; variance; standard deviation; sample size;

    机译：殖民地计数;食物;方差;标准偏差样本量;

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