Department of Food Quality and Nutrition, Research and Innovation Centre, Fondazione Edmund Mach (FEM), Via E. Mach 1, 38010 San Michele all'Adige, Italy; University of Udine, Department of Agriculture, Food, Environmental and Animal Sciences, via delle Scienze 206, 33100 Udine, Italy.
Experiment and Technological Services Department, Technology Transfer Centre, Fondazione Edmund Mach (FEM), Via E. Mach 1, 38010 San Michele all'Adige, Italy.
Food Chem. 2018 Nov 30;267:288-295. doi: 10.1016/j.foodchem.2017.06.017. Epub 2017 Jun 6.
Multielement isotope ratio was assessed in fat and defatted (protein) fillet of 130 rainbow trout, reared with feed incorporating a high or low fish content in 20 Italian farms, focusing on two northern Italian regions (Friuli Venezia Giulia and Trentino). The aim was to investigate the ability of isotopic analysis to trace the geographical origin of trout, also according to the type of feed. The carbon, nitrogen and sulphur isotope ratios of feed and fillet were highly positively correlated both within each matrix (feed or fillet) and between the two matrices and negatively correlated with the δH and δO of feed and the δH. The δH and δO were positively interrelated with the δO of tank water. By applying the tested Partial Least Squares - Discriminant Analysis multiclass model (85 fillets) to the validation dataset (45 fillets), 91% accuracy was obtained for the two Italian regions.
对在意大利 20 个农场使用高或低鱼含量饲料养殖的 130 条彩虹鳟的脂肪和脱脂（蛋白质）鱼片进行了多元素同位素比值评估，重点关注意大利北部的两个地区（弗留利-威尼斯朱利亚和特伦蒂诺）。目的是根据饲料类型研究同位素分析追踪鳜鱼地理起源的能力。饲料和鱼片的碳、氮和硫同位素比值在每个基质（饲料或鱼片）内以及两个基质之间高度正相关，与饲料的δH 和δO 以及δH 呈负相关。δH 和δO 与水箱水的δO 呈正相关。将测试的偏最小二乘判别分析多类模型（85 片鱼片）应用于验证数据集（45 片鱼片），得到了两个意大利地区 91%的准确率。
