title: Correlation between a novel calpastatin biosensor and traditional calpastatin assay techniques.
abstract: An optical fiber biosensor to detect calpastatin has been investigated as a preliminary step in developing tenderness detection instrumentation. Longissimus dorsi samples were taken from beef carcasses (n=21) at 0, 24, 36 and 48h postmortem. Muscle homogenates were assayed for calpastatin activity using traditional methods and an optical fiber biosensor. Warner-Bratzler shear force was also performed on a steak from each carcass at 14d postmortem. Results demonstrated that the measurements with highest correlation between traditional calpastatin assays and optical biosensor readings were taken at 48h postmortem (r=0.597, P< or =0.01), suggesting that this is the best time for use of this biosensor in an on-line grading system. This research further advances the development of a calpastatin biosensor and would be useful in laboratory determination of the presence of biologically active calpastatin concentrations.
authors.affiliation: Department of Animal Sciences, University of Missouri, Columbia, MO 65211, United States.
authors.forename: C L
authors.initials: CL
authors.lastname: Bratcher
authors.forename: S A
authors.initials: SA
authors.lastname: Grant
authors.forename: R C
authors.initials: RC
authors.lastname: Stringer
authors.forename: C L
authors.initials: CL
authors.lastname: Lorenzen
mesh_terms: D000818:Animals; D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D002135:Calcium-Binding Proteins / Q000032:analysis*; D002417:Cattle; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005504:Food Analysis / Q000295:instrumentation* / Q000379:methods; D008460:Meat / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013223:Statistics as Topic
chemical_list: D002135:Calcium-Binding Proteins; C033668:calpastatin