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为了快速准确地检测饲料中牛、羊源性成分,试验采用实时荧光PCR方法,分别以牛、羊各自物种特异性基因为研究对象,设计实时荧光PCR扩增的特异性引物及探针,建立饲料中牛、羊源性成分的实时荧光PCR检测方法。结果表明:该检测方法特异性强、灵敏度高(达到0. 01%),可以作为饲料中牛、羊源性成分检测的常规方法。通过对15种市售饲料样品进行检验,结果 2种饲料骨粉未标明含有羊源性成分,但检出;1种饲料骨粉标签中未标明成分,但检出牛源性成分,证实该方法操作简便快捷,可以快速、准确、大批量地开展饲料的日常检测工作。 相似文献
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本研究旨在建立一种快速可视化检测牛轮状病毒(BRV)的反转录-环介导恒温扩增方法(RT-LAMP)。根据BRV的群特异性基因VP6设计一套LAMP引物,对反应条件和试剂浓度进行优化,建立了恒温(63.5℃)、快速(45 min)的检测方法。结果显示:所建立方法特异性好,检测其他对照病毒均为阴性;灵敏度高,最低可检测到1个拷贝的阳性质粒,扩增产物经酶切分析结果正确,扩增结果可通过观察浑浊度或加入染料后直接判定。建立了用于检测BRV的RT-LAMP方法,该方法简便、快速、特异性好、灵敏度高,适合基层和现场检测。 相似文献
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根据牛特异性线粒体DNA片段,设计合成1对引物,以生、熟牛肉为材料,建立了肉制品中牛源性成分的PCR检测方法,并用该法对市售的67份牛肉制品进行检测。结果显示,所检牛源性成分在271 bp处出现预期的条带,扩增片段经Sau3AⅠ酶切分析确认,获得的214和57 bp片段与预期一致;运用该引物均可扩增出水牛肉、牦牛肉、奶牛肉、黄牛肉单一的相同大小的DNA条带,而对羊、马、狗、驴、兔和鸭等14种动物肉的DNA扩增则呈阴性,其检测灵敏度达到53.2 fg/μL DNA;利用该法对67份牛肉制品进行检测,检出率为100%。结果表明,该法快速简便,且具有较高的特异性和敏感性,可用于市售牛肉制品中牛源性成分的鉴定。 相似文献
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实时荧光定量PCR检测畜禽肉制品中鸭源性成分 总被引:3,自引:0,他引:3
根据鸭mtDNA COX基因上的保守序列设计特异性引物和TaqMan探针,建立实时荧光定量PCR用于检测畜禽肉制品中的鸭源性成分。结果表明,建立的方法特异性强,与鹅、鸡、羊、牛等15种动物DNA无非特异性扩增;灵敏度高,可检测1.0pg/μL鸭源DNA的存在;重复性好,同DNA浓度所测得Ct值的变异系数均小于3%;应用该法对模拟混合样品进行检测,结果与预期相符,且常见肉类DNA的存在并不影响该法对鸭源性成分检测的灵敏度。说明本试验建立的鸭源性成分实时荧光定量PCR法特异、敏感、稳定,可快速准确检测畜禽肉制品中含有的鸭源性成分。 相似文献
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动物产品中牛、羊源性成分多重PCR检测方法的建立 总被引:16,自引:2,他引:14
以肉骨粉、鱼粉、猪肉干和鱼肉干为研究对象,异硫氰酸胍法提取总DNA,18S rDNA片段的扩增结果表明提取到的DNA中不存在抑制PCR的物质。应用梯度PCR技术对牛、羊源性成分检测的退火温度进行了优化,在单一PCR检测技术的基础上分别进行了18S rDNA片段和牛、羊源性成分的多重PCR分析,得到了预期的结果。试验表明,本文建立的多重PCR方法具有快速、简便、准确等特点,对动物产品牛、羊源性成分检测具有重要意义。 相似文献
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动物产品中猪源性和牛源性成分双重荧光PCR检测方法的建立 总被引:1,自引:0,他引:1
[目的]建立双重荧光PCR法,检测动物产品中猪、牛源性成分。[方法]分别针对猪、牛线粒体DNA(mitochondrial DNA,mtDNA)种间保守基因,设计特异性引物与探针,通过对反应体系和反应条件的优化筛选,建立了双重荧光PCR方法,在同一个荧光PCR反应中完成2种动物源性成分的检测。并对该方法的特异性、敏感性进行评估。[结果]对16种不同的动物DNA进行检测.仅猪、牛源性成分收集到相应的典型的S型扩增曲线,对猪、牛二联模板的检测,可同时收集到相应模板的扩增曲线.其余14种动物源性成分未发现扩增曲线。双重荧光PCR对猪肉、牛肉模板的最低检出限均为10^-5,与相应的单重荧光PCR方法的检出限一致。[结论]该方法特异性强,敏感性高,适用于肉制品、奶制品、饲料等动物源性产品的检测。 相似文献
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A multiplex PCR based assay was developed for the highly sensitive and specific detection of Coxiella (C.) burnetii in cow's milk. The assay simultaneously amplifies a diagnostic target within the C. burnetii IS1111 sequence and a control target within the bovine CD18 gene. The internal PCR amplification control allows the discrimination of false negative results (single tube reaction failures) from negative results due to true absence of target sequences. In order to maximize the sensitivity of the assay, a sample preparation method including a centrifugation step to concentrate the bacterium was developed. In milk samples artificially contaminated with serial dilutions of C. burnetii, about four particles per ml could reproducibly be detected. The sensitivities of both assays, multiplex PCR and PCR with only a single pair of primers ('simplex' PCR), were observed to be similar. 相似文献
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PCR方法鉴别肉骨粉中的动物成份种类 总被引:9,自引:0,他引:9
为防范疯牛病传入我国,有必要鉴别肉骨粉中动物成份的种类。针对牛、羊、猪和鸡四种动物的特异性核苷酸序列,分别选用和设计了四对特异性引物,用试剂盒提取四种动物的肉骨粉或者处理过的肉组织中的DNA,然后进行PCR扩增,所扩增的目的片断大小分别为271bp、199bp、196bp、148bp,运用PCR技术建立了鉴定这四种动物源性成分的方法。结果分别扩增出四种动物的特异性条带,证明该PCR方法具有很高的特异性和敏感性,而且成本低廉,简便易行,因此可以作为鉴别肉骨粉种类的常规方法。 相似文献
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Several phenotypic as well as genotypic methods have been published describing the detection of central nervous system (CNS) tissues that are part of the bovine spongiform encephalopathy (BSE) risk material in food products. However, none of these methods is able to differentiate between CNS tissue of the banned ruminant species and tissues of other animal species. A quantitative and species-specific real-time RT-PCR method has been developed that enables the reliable identification of CNS tissues in meat and meat products. This method is based on a messenger (m)RNA assay that uses bovine, ovine and caprine glial fibrillary acidic protein (GFAP) encoding gene sequences as markers. The in-house validation studies evaluated the tissue specificity of up to 15 bovine tissues and the standardization of absolute as well as relative quantitative measurement. The specific amplification of spinal cord and brain tissue GFAP cDNA has been shown previously. In addition, two commercially available ELISA kits were used for the comparative analysis of artificially contaminated minced meat. Small quantities of bovine brain that had been stored over the recommended period of 14 days were examined. The real-time PCR method proved to be suitable for the detection of 0.1% CNS tissue. No false negative results were observed. The quantitative detection of GFAP mRNA using real-time RT-PCR seems a suitable tool in routine diagnostic testing that assesses the illegal use of CNS tissue in meat and meat products. The stability of the selected target region of the GFAP mRNA also allows the detection of CNS tissues after the meat has been processed. 相似文献
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根据Q热贝氏柯克斯体(Coxiella burnetii)插入序列IS1111序列设计1套特异性引物,建立快速检测Q热的环介导等温扩增(loop-mediated isothermal amplification,LAMP)实时浊度检测方法。以梯度稀释含有目的扩增片段的重组质粒作为标准品,在恒温反应条件下,对靶基因的特定区域进行扩增,建立LAMP检测方法。结果显示,该方法能够检测出10个拷贝数的阳性质粒,而对结核分枝杆菌(M.tuberculosis)、衣原体(C.psittaci)、布鲁氏杆菌(Brucella.spp)及部分牛血液的核酸样本的特异性检测结果均为阴性,无交叉反应。本研究建立的LAMP实时浊度检测方法灵敏度高、特异性好,在Q热的检测与鉴定中具有良好的应用前景。 相似文献
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为鉴定和区分饲料及动物产品中牛、山羊、绵羊源性成分,根据线粒体DNA(mitochondrial DNA,mtDNA)种间保守序列,设计合成了3对特异性引物与TaqMan探针,通过对荧光PCR反应体系和反应条件的优化筛选,建立了三重荧光PCR方法,在同一个荧光PCR反应中完成3种动物源性成分的检测。用该方法对16种不同源性的动物DNA进行检测,结果表明能特异地鉴别检测出牛、山羊和绵羊源性成分,且敏感性比现行国标PCR法高100倍。该方法适用于饲料、肉制品、奶制品等动物源性产品的检测。 相似文献
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本研究针对牛传染性鼻气管炎病毒(Infectious bovine rhinotracheitis virus,IBRV)高度保守的gC基因设计单标记并具有自身荧光淬灭功能的LUX^TM引物,建立L刚新型实时荧光PCR方法用于快速检测IBRV。该方法对四株IBRV细胞培养物的检测均呈典型阳性反应,而对其它动物疱疹病毒以及健康牛组织DNA和细胞对照的检测结果为阴性,检测时间包括核酸提取仅需1h~2h。试验表明,LUX^TM荧光PCR法对IBRV细胞增殖病毒液的检测敏感性可达0.04TCID50,比病毒分离敏感性至少提高10倍;对10倍系列稀释的纯化IBRV核酸样品,L刚荧光PCR的检测敏感性比常规PCR可提高10^3倍。将病毒液添加到健康牛精液和血液样品中,该荧光PCR可检测到牛冻存精液中40TCID50牛抗凝全血、血清和临床精液中0.04TCID50的病毒,说明对临床样品的检测有效。本研究所建立的LUXTM荧光PCR方法快速敏感,适合应用于活牛及其遗传物质的进出口检疫、养牛业疾病防控等领域对IBRV的快速检测。 相似文献
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Primers were designed based on insert sequence IS1111 of Coxiella bumetii of Q fever, SYBR GreenⅠReal-time quantitative PCR assay was developed for indentification of Q fever. The recombinant plasmid containing the target sequence was constructed to detect the sensitivity and prepare the standard curve. The method could detect 102 of the plasmid copy numbers.Related coefficient was 0.991 of the standard curve,the amplification efficiency was 98%.The results of specific detection of nucleic acid sample for M.tuberculosis,Chlamydia,Brucella and bovine blood were negative. SYBR GreenⅠfluorescent quantitative PCR method developed in this study had high Brucella sensitivity and specificity,and could be used for clinical test. 相似文献