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我国核桃产地溯源研究

时间:2018-09-20 17:31来源:毕业论文
基于全波段建立的PLSDA模型的建模集和预测集的区分准确率整体略高于基于特征波段建立的PLSDA模型的准确率;对于同一品种的核桃,基于红外光谱建立的PLSDA溯源模型具有较高的识别率

摘要:为了减少因产地而产生的食品安全问题,本实验以核桃为材料,利用红外光谱和矿物质元素两种方法来获取来自全国11个地区的核桃的指纹信息,然后基于全波段和特征波段使用PLSDA分别对核桃样品的产地进行区分;采用方差分析法测定不同地区样品元素含量的显著差异。结果表明基于全波段建立的PLSDA模型的建模集和预测集的区分准确率整体略高于基于特征波段建立的PLSDA模型的准确率;对于同一品种的核桃,基于红外光谱建立的PLSDA溯源模型具有较高的识别率。方差分析结果表明,十一个地区的核桃中含有的主要元素有Mg、Ca、K,其次含有的元素是Zn、Fe、Mn、Cu、Sr、Na,还有些地区的核桃含有少量的Ba、Pb、Ni。而且不同产地的Mg、Ca、K、Zn、Fe、Mn、Sr、Na、Ba、Pb、Ni这11个元素都存在显著差异。该研究对我国不同地区的核桃进行产地溯源,为农产品产地溯源提供可靠的理论依据。28300
毕业论文关键词:核桃;产地溯源;红外光谱;矿物质元素;区分模型
Research on the Origin of Walnut Origin in China
Abstract:In order to reduce the food safety problems caused by the origin, the walnuts were used as the materials to extract fingerprint information of walnut from eleven regions of the country by infrared spectroscopy and mineral elements. And then based on the whole band and the characteristic band using PLSDA respectively to distinguish the origin of walnut. The variance analysis was used to determine the significant differences in the content of elements in different areas. The results indicated that the accuracy of the modeling and predictive set of PLSDA model based on full-band establishment was slightly higher than PLSDA model based on feature band. For the same variety of walnuts, the PLSDA model based on infrared spectrum had Higher recognition rate. Results of variance analysis showed that eleven areas of the walnuts contained the main elements were Mg, Ca, K, secondly elements were Zn, Fe, Mn, Cu, Sr, Na, and some areas of walnuts contained a small amount of Ba, Pb, Ni. And there are significant differences in the eleven elements of Mg, Ca, K, Zn, Fe, Mn, Sr, Na, Ba, Pb and Ni from different origins. The research on the origin of walnut in different regions of China, it provides a reliable theoretical basis for traceability of agricultural products.
源¥自%六:维;论-文'网=www.lwfree.cn

Key words: Walnut; Origin traceability; infrared spectroscopy; element; discriminate model
摘要    1
关键词    1
Abstract    1
Key words    1
引言    1
1 材料与方法    2
1.1 核桃品种    2
1.2 仪器和设备    3
1.3 近红外测定    3
1.4 中红外测定    3
1.5 元素测定    3
1.6 数据处理    3
2 结果与分析    4
2.1 近红外    4
2.1.1 不同地区基于近红外光谱的判别分类结果    4
2.1.2 同一品种不同产地基于近红外光谱的判别分类结果    5
2.2 中红外    7
2.2.1不同地区基于中红外光谱的判别分类结果    7
2.2.2 同一品种不同产地基于中红外光谱的判别分类结果    7
2.3 近中红外整体分析    9
2.4 元素测定    10
2.5 元素测定分析    11
3 结论    11
致谢    12
参考文献    12
我国核桃产地溯源研究
核桃(胡桃科植物)作为最常见的坚果,广泛分布于全世界,而中国是最大的产地之一[1]。我国核桃的分布,除西藏地区和辽东半岛2个产区属于隔绝环境呈间断分布之外,其他地方的核桃,都呈现连续分布[2]。核桃是我国的重要特色农产品资源,很多省市都有自己的特色品种。然而,在市场上有很多假货冒充各种产区的优质核桃,且目前关于核桃产地的分类研究还未见报道。 我国核桃产地溯源研究:http://www.lwfree.cn/shiping/20180920/23227.html
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