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Quantitative species determination based on real time PCR–Can the results be expressed as weight/weight equivalents?
Food Biotechnology ( IF 1.8 ) Pub Date : 2020-04-02 , DOI: 10.1080/08905436.2020.1743305
Liping Song 1 , Zhikai Hu 1 , Qinglong Wang 1 , Jie Jiang 2 , Yue Cao 1 , Dan Wang 1 , Sun Rui 1 , Long Li 1 , Xuefeng Cai 1 , Yantao Wu 1 , Yiping Suo 1
Affiliation  

ABSTRACT Food adulteration is a common challenge in the meat industry. Polymerase chain reaction (PCR) has been used as a method to detect contamination from different species of meat. From a consumer perspective, a PCR method with measurements in terms of weight/weight (w/w) ratios will be more familiar. In this study, the focus was on how to convert the results of quantitative analysis from genome/genome (g/g) to w/w using real-time PCR. The mixtures with different ratios of mutton in pork were analyzed as test samples. The c values of different species, as a reflection of the key conversion factors, were established and evaluated. The effects of heat treatment on w/w conversion of PCR data were also assessed. The results indicated that the c value shows significant variability among individual samples. An average c value was found to cause a bias of more than 7% for mixtures in the range of 20–80%. For individual meat samples with pre-determined c-values, real-time PCR was useful for quantitative analysis of mutton contamination in pork within the range of 20–80%, with a bias of detection of less than 2%. However, this method was shown to have a limit of quantification of 5% with mutton in pork. Furthermore, heat treatment (121°C, 15 min) significantly reduced the accuracy of quantitative analyses. Because the c value is not available for most commercial samples, and some food products are subjected to heat treatment as a method of sterilization, accurate quantitative analysis (w/w) may not be an option for commercial samples using PCR-based technology.

中文翻译:

基于实时 PCR 的定量物种确定 - 结果可以表示为重量/重量当量吗?

摘要 食品掺假是肉类行业普遍面临的挑战。聚合酶链反应 (PCR) 已被用作检测不同种类肉类污染的方法。从消费者的角度来看,以重量/重量 (w/w) 比进行测量的 PCR 方法将更加熟悉。在这项研究中,重点是如何使用实时 PCR 将定量分析的结果从基因组/基因组 (g/g) 转换为 w/w。以猪肉中不同比例羊肉的混合物作为测试样品进行分析。建立并评估了不同物种的 c 值,作为关键转换因子的反映。还评估了热处理对 PCR 数据 w/w 转换的影响。结果表明,c 值在各个样品之间显示出显着的变异性。对于 20-80% 范围内的混合物,发现平均 c 值会导致超过 7% 的偏差。对于具有预先确定的 c 值的单个肉类样品,实时 PCR 可用于定量分析猪肉中羊肉污染在 20-80% 范围内,检测偏差小于 2%。然而,该方法被证明对猪肉中的羊肉具有 5% 的定量限制。此外,热处理(121°C,15 分钟)显着降低了定量分析的准确性。由于大多数商业样品无法获得 c 值,并且一些食品经过热处理作为灭菌方法,因此使用基于 PCR 的技术的商业样品可能无法进行准确的定量分析 (w/w)。对于具有预先确定的 c 值的单个肉类样品,实时 PCR 可用于定量分析猪肉中羊肉污染在 20-80% 范围内,检测偏差小于 2%。然而,该方法被证明对猪肉中的羊肉具有 5% 的定量限制。此外,热处理(121°C,15 分钟)显着降低了定量分析的准确性。由于大多数商业样品无法获得 c 值,并且一些食品经过热处理作为灭菌方法,因此使用基于 PCR 的技术的商业样品可能无法进行准确的定量分析 (w/w)。对于具有预先确定的 c 值的单个肉类样品,实时 PCR 可用于定量分析猪肉中羊肉污染在 20-80% 范围内,检测偏差小于 2%。然而,该方法被证明对猪肉中的羊肉具有 5% 的定量限制。此外,热处理(121°C,15 分钟)显着降低了定量分析的准确性。由于大多数商业样品无法获得 c 值,并且一些食品经过热处理作为灭菌方法,因此使用基于 PCR 的技术的商业样品可能无法进行准确的定量分析 (w/w)。证明该方法对猪肉中的羊肉具有 5% 的定量限。此外,热处理(121°C,15 分钟)显着降低了定量分析的准确性。由于大多数商业样品无法获得 c 值,并且一些食品经过热处理作为灭菌方法,因此使用基于 PCR 的技术的商业样品可能无法进行准确的定量分析 (w/w)。证明该方法对猪肉中的羊肉具有 5% 的定量限。此外,热处理(121°C,15 分钟)显着降低了定量分析的准确性。由于大多数商业样品无法获得 c 值,并且一些食品经过热处理作为灭菌方法,因此使用基于 PCR 的技术的商业样品可能无法进行准确的定量分析 (w/w)。
更新日期:2020-04-02
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