A study of the variability associated with sampling peanuts for aflatoxin
A study of the variability associated with sampling peanuts for aflatoxin
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花生采样黄曲霉毒素相关变异性的研究
DOI：
10.1007/bf02540625
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发表时间：
1969
影响因子：
2
通讯作者：
P. J. Tiemstra
中科院分区：
文献类型：
--
作者：
P. J. Tiemstra
一批已知含有黄曲霉毒素的花生被广泛取样，以研究变异的来源。使用嵌套设计，其中切片（50袋单位）、子样品和分析变异性是研究的变量。样本量是表征该批次的最关键因素。从一节到另一节的变异性并不显着，表明污染物的随机分布。从1968年作物的许多批次中采集了三个20磅的样品，每个样品又细分为两个相等的子样品。对这些子样品中的每一个测定黄曲霉毒素。结果表明，所有的显着变异来自子样本，进一步加强了论文的样本量是变异性的关键因素，而不是批次不均匀性。对来自1967年作物的550批进行分析，其中三倍体和分析可用，表明变异的幅度略大于实验批次。使用1967年作物数据的合并标准差，绘制了操作特性曲线，以证明通过增加样本量可以预期的改进。
One lot of peanuts known to contain aflatoxin was extensively sampled to study the sources of variability. A nested design was used where sections (50 bag units), subsamples and analytical variation were the variables studied. Sample size was the most critical factor in characterizing this lot. Variability from section to section was not significant indicating random distribution of the contaminant. Three 20 lb samples were taken on a number of lots from the 1968 crop, each of which was subdivided into two equivalent subsamples. The aflatoxin was determined on each of these subsamples. The results indicated that all the significant variation came from the subsamples, further enforcing the thesis that sample size is the critical factor in variability, and not lot inhomogeneity. Analysis of 550 lots from the 1967 crop where triples and analysis were available indicates that the magnitude of the variability is a little greater than was found on the experimental lot. Using the pooled standard deviation of the 1967 crop data, operating characteristic curves were plotted to demonstrate the improvement that can be expected by increasing the sample size.