title: Fast determination of beef quality parameters with time-domain nuclear magnetic resonance spectroscopy and chemometrics.
abstract: The noteworthy of this study is to predict seven quality parameters for beef samples using time-domain nuclear magnetic resonance (TD-NMR) relaxometry data and multivariate models. Samples from 61 Bonsmara heifers were separated into five groups based on genetic (breeding composition) and feed system (grain and grass feed). Seven sample parameters were analyzed by reference methods; among them, three sensorial parameters, flavor, juiciness and tenderness and four physicochemical parameters, cooking loss, fat and moisture content and instrumental tenderness using Warner Bratzler shear force (WBSF). The raw beef samples of the same animals were analyzed by TD-NMR relaxometry using Carr-Purcell-Meiboom-Gill (CPMG) and Continuous Wave-Free Precession (CWFP) sequences. Regression models computed by partial least squares (PLS) chemometric technique using CPMG and CWFP data and the results of the classical analysis were constructed. The results allowed for the prediction of aforementioned seven properties. The predictive ability of the method was evaluated using the root mean square error (RMSE) for the calibration (RMSEC) and validation (RMSEP) data sets. The reference and predicted values showed no significant differences at a 95% confidence level.
authors.affiliation: Embrapa Instrumentação, Rua Quinze de Novembro 1452, São Carlos, SP 13561-206, Brazil. Electronic address: fmverbi@uol.com.br.
authors.forename: Fabíola Manhas Verbi
authors.initials: FM
authors.lastname: Pereira
authors.forename: Sérgio
authors.initials: S
authors.lastname: Bertelli Pflanzer
authors.forename: Thaísa
authors.initials: T
authors.lastname: Gomig
authors.forename: Carolina
authors.initials: C
authors.lastname: Lugnani Gomes
authors.forename: Pedro Eduardo
authors.initials: PE
authors.lastname: de Felício
authors.forename: Luiz Alberto
authors.initials: LA
authors.lastname: Colnago