Road map to traceability in animal meat production may include non-destructive and objective techniques to fingerprint a typical product. Optic observation of muscle specimens by the NIRS radiation, after easy preparation in ethanol, may retrospect some intrinsic effects in a simple way. The present work aims to evaluate the characterization ability of the method applied to a rare typical heavy Italian pig production. Italian heavy pigs from Mora Romagnola breed (M, n=14) and commercial Hybrids (H, n=16) were reared in three farm conditions: Intensive (I), Confined (C), Pasture (P). Small specimens of longissimus thoracis muscle were fully immersed in ethanol 95%. After 2h aeration the samples were scanned by a LabSpec- Pro(ASD) portable (UV-Vis-NIRS:350-2500nm). Chemometrics MPLS was performed to contrast the two genetic types and the three rearing methods, then clustered. According UV-Vis-NIRS features P and C were differentiated from the I pigs. R2cv (cross-validation) for P-C, P-I and C-I were 0.32, 0.95 and 0.84 respectively, while multivariate R2cv of 10-Lab were 0.05, 0.47 and 0.48. The spectra from I system were less rich and 13% lower. Genetic type was discriminated by NIRS with R2cv 0.59 a value corresponding to a concrete 90% recovery of the Mora Romagnola or Hybrids subjects while from 5-Meat-Lab the R2cv was 0.17. In conclusions NIRS examine of ethanol preparations may reveal intrinsic properties of typical products mainly if they will be considered as lot and not as single “forensic” specimen.
NIR Spectroscopy of muscle ethanol prepared specimensto differentiate rearing mode and genetic type of Italian heavy pigs
BARBERA, Salvatore
2011-01-01
Abstract
Road map to traceability in animal meat production may include non-destructive and objective techniques to fingerprint a typical product. Optic observation of muscle specimens by the NIRS radiation, after easy preparation in ethanol, may retrospect some intrinsic effects in a simple way. The present work aims to evaluate the characterization ability of the method applied to a rare typical heavy Italian pig production. Italian heavy pigs from Mora Romagnola breed (M, n=14) and commercial Hybrids (H, n=16) were reared in three farm conditions: Intensive (I), Confined (C), Pasture (P). Small specimens of longissimus thoracis muscle were fully immersed in ethanol 95%. After 2h aeration the samples were scanned by a LabSpec- Pro(ASD) portable (UV-Vis-NIRS:350-2500nm). Chemometrics MPLS was performed to contrast the two genetic types and the three rearing methods, then clustered. According UV-Vis-NIRS features P and C were differentiated from the I pigs. R2cv (cross-validation) for P-C, P-I and C-I were 0.32, 0.95 and 0.84 respectively, while multivariate R2cv of 10-Lab were 0.05, 0.47 and 0.48. The spectra from I system were less rich and 13% lower. Genetic type was discriminated by NIRS with R2cv 0.59 a value corresponding to a concrete 90% recovery of the Mora Romagnola or Hybrids subjects while from 5-Meat-Lab the R2cv was 0.17. In conclusions NIRS examine of ethanol preparations may reveal intrinsic properties of typical products mainly if they will be considered as lot and not as single “forensic” specimen.
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