Papoci Sergej, de la Calle Guntiñas María Beatriz
European Commission, Joint Research Centre (JRC), Geel, Belgium.
Curr Res Food Sci. 2025 May 29;10:101099. doi: 10.1016/j.crfs.2025.101099. eCollection 2025.
Oregano is frequently adulterated as demonstrated in a recent control plan organised by the European Commission. In this work, the elemental profiles of 282 oregano samples analysed by energy dispersive X-ray fluorescence were used in combination with multivariate analyses to detect adulteration, in particular with olive leaves. The analyses were carried out in the frame of the coordinated control plan on the authenticity of herbs and spices organised by the European Commission. Partial Least Square Discriminant Analyses, allowed the detection of adulterated samples with a sensitivity of 81 %, and a specificity of 92 %; among the adulterated samples PLS-DA allowed the detection of samples that contained olive leaves with a sensitivity of 94 % and a specificity of 92 %. Copper mass fraction is of relevance because it is significantly higher in samples adulterated with olive leaves. The ratio Cu/Zn allowed the identification of adulterated samples with a sensitivity and specificity of 85 % without the need to use modelling techniques. The elemental profile of oregano obtained by EDXRF was also used to authenticate the geographical origin declared in the labels.
正如欧盟委员会近期组织的一项控制计划所表明的那样，牛至经常被掺假。在这项研究中，通过能量色散X射线荧光光谱分析的282份牛至样品的元素谱，结合多变量分析来检测掺假情况，特别是与橄榄叶的掺假。这些分析是在欧盟委员会组织的关于草药和香料真实性的协调控制计划框架内进行的。偏最小二乘判别分析能够检测出掺假样品，灵敏度为81%，特异性为92%；在掺假样品中，偏最小二乘判别分析能够检测出含有橄榄叶的样品，灵敏度为94%，特异性为92%。铜的质量分数具有相关性，因为在掺有橄榄叶的样品中它显著更高。铜/锌比值能够识别掺假样品，灵敏度和特异性均为85%，无需使用建模技术。通过能量色散X射线荧光光谱法获得的牛至元素谱还被用于验证标签上声明的地理来源。
