Correlation between a novel calpastatin biosensor and traditional calpastatin assay techniques

C. L. Bratcher, S. A. Grant, R. C. Stringer, C. L. Lorenzen

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


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 48 h 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 14 d postmortem. Results demonstrated that the measurements with highest correlation between traditional calpastatin assays and optical biosensor readings were taken at 48 h postmortem (r = 0.597, P ≤ 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.

Original languageEnglish
Pages (from-to)1429-1434
Number of pages6
JournalBiosensors and Bioelectronics
Issue number10
StatePublished - May 15 2008


  • Beef
  • Biosensor
  • Calpastatin
  • Fluorescence
  • Tenderness


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