Food Characterization and Quality Department, Instituto de la Grasa (C.S.I.C.), Avda. Padre García Tejero 4, 41012 Seville, Spain.
Anal Bioanal Chem. 2011 Feb;399(6):2115-22. doi: 10.1007/s00216-010-4387-z. Epub 2010 Nov 12.
The composition of volatile components of subcutaneous fat from Iberian pig has been studied. Purge and trap gas chromatography-mass spectrometry has been used. The composition of the volatile fraction of subcutaneous fat has been used for authentication purposes of different types of Iberian pig fat. Three types of this product have been considered, montanera, extensive cebo and intensive cebo. With classification purposes, several pattern recognition techniques have been applied. In order to find out possible tendencies in the sample distribution as well as the discriminant power of the variables, principal component analysis was applied as visualisation technique. Linear discriminant analysis (LDA) and soft independent modelling by class analogy (SIMCA) were used to obtain suitable classification models. LDA and SIMCA allowed the differentiation of three fattening diets by using the contents in 2,2,4,6,6-pentamethyl-heptane, m-xylene, 2,4-dimethyl-heptane, 6-methyl-tridecane, 1-methoxy-2-propanol, isopropyl alcohol, o-xylene, 3-ethyl-2,2-dimethyl-oxirane, 2,6-dimethyl-undecane, 3-methyl-3-pentanol and limonene.
已经研究了伊比利亚猪皮下脂肪挥发成分的组成。采用了吹扫捕集气相色谱-质谱法。已经使用皮下脂肪挥发性部分的组成来鉴定不同类型的伊比利亚猪脂肪。考虑了这种产品的三种类型，montanera、extensive cebo 和 intensive cebo。为了找出样品分布的可能趋势以及变量的判别能力，应用了主成分分析作为可视化技术。应用线性判别分析（LDA）和软独立建模分类相似性（SIMCA）来获得合适的分类模型。LDA 和 SIMCA 允许使用 2,2,4,6,6-五甲基庚烷、间二甲苯、2,4-二甲基庚烷、6-甲基十三烷、1-甲氧基-2-丙醇、异丙醇、对二甲苯、3-乙基-2,2-二甲基环氧乙烷、2,6-二甲基十一烷、3-甲基-3-戊醇和柠檬烯的含量来区分三种育肥日粮。
