Bravo-Lamas Leire, Barron Luis J R, Kramer John K G, Etaio Iñaki, Aldai Noelia
Quality & Safety of Ruminant Products, Department of Pharmacy & Food Sciences, Faculty of Pharmacy, University of the Basque Country (UPV/EHU), 01006, Vitoria-Gasteiz, Spain.
Guelph Food Research Centre, Agriculture & Agri-Food Canada, Guelph, ON, Canada.
Meat Sci. 2016 Jul;117:108-16. doi: 10.1016/j.meatsci.2016.02.043. Epub 2016 Mar 2.
A survey of commercially available lamb meat was performed in northern Spain in order to evaluate their fatty acid (FA) composition with emphasis on trans fatty acid (TFA) and conjugated linoleic acid (CLA) isomers. Samples were collected in spring (n=24) and winter (n=24) of 2013, and were obtained in about equal numbers from grocery stores and butcher-shops. Subcutaneous fat, known to be a sensitive indicator of TFA content in ruminants, was analyzed by GC-FID. In general, very few differences were observed between collection periods and type of stores because of the high variability within the groups that was believed to be associated with differences in genetics and feeding strategies. However, the 10t/11t ratio of all samples showed two clearly identifiable groups irrespective of the source: 1) when 10t/11t was >1, 10t-shifted samples; 2) when 10t/11t was ≤1, non-shifted samples where 11t-18:1 was the predominant isomer. These two groups were clearly identified and associated with distinct FAs using principal component analysis.
为了评估市售羊肉的脂肪酸（FA）组成，重点关注反式脂肪酸（TFA）和共轭亚油酸（CLA）异构体，在西班牙北部开展了一项关于市售羊肉的调查。于2013年春季（n = 24）和冬季（n = 24）采集样本，样本大致等量地取自杂货店和肉店。皮下脂肪是反刍动物体内反式脂肪酸含量的敏感指标，采用气相色谱 - 火焰离子化检测法（GC - FID）对其进行分析。总体而言，由于组内变异性较高，且认为这种变异性与遗传和饲养策略的差异有关，因此在采集时间和店铺类型之间未观察到明显差异。然而，所有样本的10t/11t比值显示出两个可明确识别的组，与来源无关：1）当10t/11t＞1时，为10t移位样本；2）当10t/11t≤1时，为非移位样本，其中11t - 18:1是主要异构体。使用主成分分析明确识别了这两组，并将其与不同的脂肪酸相关联。
