Conversely, Cozzolino and Murray
(2002) and Andrés et al. (2008) accurately predicted pH values in
beef samples (R2= 0.81, 0.97; RPD= 2.11, 3.17; respectively), probably
because of the use of an intact meat sample when scanned using NIRS.
Nevertheless, Kapper et al. (2012a) were not successful in estimating
pH in intact pork samples when NIRS measurements were taken in a
laboratory setting (R2 = 0.39; RPD = 1.3), although Kapper, Klont,
Verdonk, Williams, and Urlings (2012b) improved the NIRS predictability
of pH in intact pork samples when NIRS measurements were collected
under production plant conditions (R2 = 0.65; RPD = 1.7). This disagreement
between results could be due to different ranges of pH reference
data and repeatability of the referencemethod as well as differences
between species.