基于SVM方法的猪肉新鲜度分类问题研究

文中采取减压贮藏方式对新鲜猪肉进行了贮藏实验,测定了不同贮藏时间样品的挥发性盐基氮含量(TVB-N)、细菌总数、pH值及感官评价数据,并运用支持向量机(support vector machine,SVM)对这些样本数据进行训练,选取不同的核函数,得到SVM神经网络模型,随后利用此模型对测试数据进行猪肉新鲜度分类预测。实验表明,根据样本特性进行数据预处理,且选取合适的核函数后,SVM神经网络能得到极高的猪肉新鲜度正确分类率。     

肉品新鲜度的检测方法

肉品新鲜度的检测方法很多,主要有感官检测,理化指标检测和微生物指标检测。但是这些传统的检测方法都存在检测精度不高或耗时长,不能及时准确地反馈新鲜度的信息等局限,快速精准的无损检测方法是肉品新鲜度检测发展的一个趋势。本文综述了几种肉品新鲜度的传统检测方法和快速无损检测新方法。     

SVM方法在淀粉分类问题中的应用

采用不同品牌的马铃薯淀粉和玉米淀粉共计49个样品,运用VERTEX70进行光谱扫描,在不同光谱范围内,通过对原始光谱进行不同的预处理,得到淀粉样品的近红外光谱数据。在Matlab6.5仿真环境下,采用SVM工具包实现对样品数据的训练和预测,选取不同的核函数和惩罚因子C,可以准确地将淀粉进行分类。实验结果表明,利用近红外技术结合支持向量机对淀粉类别进行判别是可行的。      

肉品新鲜度快速检测技术研究进展

介绍了肉品新鲜度的快速检测技术原理及方法,综述了肉品新鲜度各项指标快速检测技术的研究进展,展望了肉品新鲜度的快速检测技术。加快快速在线检测仪器的研究与开发,实现肉品新鲜度的快速、无损、实时检测,这对于促进我国肉类产业的现代化发展,保障人民的身体健康都具有重要的现实意义。     

肉品新鲜度的现代快速检验方法

本文针对当今社会发展的特点和实际，为了满足社会发展的需要和人们对肉品的要求，从而阐述现在发展的肉品新鲜度的快速检测技术的原理以及测定方法，以便于对肉品的新鲜度进行快速准确地检验，剔除有损害人类健康的变质肉，保障食品安全的健康发展。     

肉品新鲜度智能指示标签的形成分类与机制研究进展

生鲜肉品在流通环境中易受到微生物、酶以及物理、化学等作用使其腐败变质,而消费者只能根据包装日期和有效期来判定肉品的新鲜度及安全性,对肉品在贮藏运输过程中所发生的质量变化,不能准确判定。智能指示标签技术恰恰能够更加清晰直观地实时监测肉品的新鲜程度。本文正是在智能指示标签概述的基础上,以肉品智能指示标签的分类形式为切入点,阐述不同类型指示标签的工作原理、应用优势以及新鲜度信息的表达形式,并从pH响应机制、硫化氢敏感机制、生物胺传感机制、酸性气体敏感机制以及微生物生态感应机制等方面深入论述智能指示标签在表征肉品新鲜程度上的内在机制,以期为提升现代智能包装以及基于肉品智能指示标签的研究与创新提供理论参考。     

肉品新鲜度评价及保鲜技术研究进展

肉品新鲜度是人们对其品质的重要要求,然而有关新鲜度分级标准研究较少,从而导致无法客观评价肉品新鲜度,这将制约肉品生产和保鲜技术的规范化发展和应用。本文综述了目前已经建立的国内外肉品质分级标准和肉品新鲜度检测技术,提出新鲜度评价的备选指标,以期为评定宰后肉品新鲜度等级建立统一分等分级标准提供依据;同时,进一步总结肉品保鲜技术的开发现状和局限性,展望其未来发展,旨在为保鲜技术创新和评价、技术应用转化落地等提供一定支持。     

基于SVM的岩石薄片图像分类

支持向量机可以克服高维表示的缺陷,被广泛运用到图像分类中。文章在研究图像特征的基础上,应用支持向量机的分类性能,实现了100个样本的分类,结果表明该实验分类准确率高,效果良好。     

色彩色差计在肉品新鲜度检验中的应用

本试验应用色彩色差计法进行了9份肉新鲜度跟踪试验。与此同时,对同一样品结合感官检验、蛋白沉淀反应——硫酸铜沉淀法进行对照试验。试验结果表明,用色彩色差计法检测原料肉的新鲜度是科学可行的,与其它理化方法相比较,它还具有精密度高、测量时间短等优点。     

基于GA优化SVM参数的白酒分类识别方法应用研究

为提升支持向量机算法在白酒品牌分类预测中的准确度,利用遗传算法优化支持向量机参数,并建立最优参数的SVM白酒品牌分类预测模型.通过阵列式传感器(电子舌)采集多个待测品牌白酒的特征信息,将提取的特征信息数据经预处理(异常值处理、归一化操作等)后存储为样本数据集.其中样本数据分为训练样本与测试样本,通过训练样本对最优参数的...     

浅述肉类新鲜度的检测方法

主要叙述了肉类新鲜度的各种检测方法,从感官检测,理化检测,微生物检测三个方面进行了阐述。     

Hypoxanthine-based enzymatic sensor for determination of pork meat freshness

An enzyme sensor employing xanthine oxidase (XO), soluble or immobilised, in combination of an oxygen electrode has been developed and optimised to determinate the hypoxanthine (Hx) content in pork meat at different post-mortem times as measure of meat freshness. The amperometric signal obtained due to the oxygen depletion during the Hx oxidation was related with the consumed oxygen at 190 s in the soluble enzyme sensor or enzymatic rate at 10 s in the immobilised enzyme sensor. In both cases a linear relationship between the signal and the Hx concentration in the range 8.68–26.05 μM (R² = 0.999) and 15.63–127 μM. (R² = 0.995), respectively, was found. Both enzyme sensors exhibited very good working conditions and storage stability. A study of Hx oxidation was carried out in order to compare the Hx content measured by both sensors and those measured by high performance liquid chromatography (HPLC) obtaining a good agreement between both techniques. Therefore, the easy preparation and operation of both enzyme sensors suggests a reliable, rapid and an economical alternative for simple or multiple Hx measurements constituting a useful tool as quality control of meat freshness.     

鱼肉鲜度快速检测技术进展

鱼肉的鲜度测定技术对于评价其质量非常重要.本文就鱼肉鲜度快速检测技术,包括图像分析、电特性参数、色差测量、近红外光谱测定、物性分析和挥发性物质分析等进行分析和总结.     

真空热缩包装技术在我国鲜肉保鲜工业中的发展

分析了我国鲜肉行业的现状、鲜肉的变质机理、真空热缩包装技术的特点,国内外该技术在鲜肉保鲜中的应用,预测在不久的将来真空热缩包装技术在我国鲜肉保鲜工业中将被广泛推广和应用。     

鮰鱼肉冷藏过程中新鲜度变化

目的 研究4℃冷藏条件下斑点叉尾鮰鱼的新鲜度变化,揭示新鲜度变化规律与各项评价指标之间的关系。方法 通过感官评价、质构、菌落总数、pH、总挥发性盐基氮(total volatile basic nitrogen, TVB-N)含量、总巯基含量、Ca2+-ATP酶活性、颜色、聚丙烯酰胺凝胶电泳(sodium dodecyl sulfate polyacrylamide gel electrophoresis, SDS-PAGE)等指标,探究4℃冷藏条件下斑点叉尾鮰鱼的新鲜度变化,研究反映鮰鱼新鲜度的关键指标,确定鮰鱼的冷藏保藏期。结果 随着冷藏时间的延长,鮰鱼肉的感官评分、硬度、总巯基含量、Ca2+-ATP酶活性下降,菌落总数、TVB-N含量上升,pH先下降后上升,弹性和总色差(△E*)先上升后下降。电泳结果表明,在冷藏期间肌球蛋白降解明显。根据皮尔森相关性分析结果,菌落总数与b*值和pH的变化相似,弹性与总色差的趋势相关。结论 鮰鱼在冷藏期间品质逐渐劣变,新鲜度下降。综合各项指标,斑点叉尾鮰鱼在4℃冷藏2d内,新鲜度和品质保持较好。本研究可为斑点叉尾鮰鱼的冷藏保鲜提供参考。     

Rapid detection of pork meat freshness by using L-cysteine-modified gold electrode

In this research, a simple and rapid glucose sensor was developed and applied in the detection of meat glucose. The gold electrode was modified using L-cysteine and nanogold solution, and a polyglutamate–glucose oxidase (GOx) complex was prepared and dropped on the modified electrode; the electrostatic binding between the L-cysteine on the electrode surface and the polyglutamate moiety of the complex resulted in the formation of a GOx-attached electrode. Glucose in meat was detected, and the enzyme electrode showed a quick response. The optimum operating conditions for this sensor were determined as follows: 0.1 M citrate buffer pH 5.0 was found to be suitable for this experiment, and the temperature was kept between 25 and 30 °C which is the suitable range for the GOx activity. A linear relationship was found between 0.1 and 0.9 mM/mL. High pressure liquid chromatography (HPLC) was also used to detect pork meat glucose, and total volatile basic nitrogen (TVBN) production was as well detected as a quality index of pork meat freshness. The results showed that the developed sensor was fast and reliable method for the detection of glucose in meat.     

Assessment of meat freshness in quality control employing chemical techniques: A review

Numerous chemical and physical tests have been described which reflect the biochemical and other changes which occur in meat during storage. Although some work has occasionally included the correlation with organoleptic data, there have been few suggestions as to possible critical legal or control limits. In industrial control, however, each method has to be considered in relation to the purpose intended and semi-empirical tests may be of value provided that the procedure is standardised. Critical maxima based on chemical values have been recommended for white fish, which differs, however, from meat in having a negligible fat content. With meat, protein breakdown usually precedes fat spoilage, but in certain circumstances the order of these reactions is reversed. Recommended limits for meat should take into account both types of spoilage. The review concludes with suggestions for a coordinated programme of study which could help in clarifying some of the difficulties inherent in the application of meat spoilage research in industrial control.