Statistics

How do you calculate bradford / BCA protein assay?

Fit a standard curve, subtract the blank, and back-calculate protein with dilution. The relationship used is C = (A − blank − intercept) / slope.

Worked example

Every number below is computed by the calculator, not typed in

What you are given

  • Standard conc: 0, 2, 4, 6, 8, 10
  • Standard signal: 0.05, 0.25, 0.45, 0.65, 0.85, 1.05
  • Sample signal: 0.55

Formula: C = (A − blank − intercept) / slope

The working

  1. Model: Bradford (linear) = linear
  2. Blank subtracted: net = signal − blank = 0
  3. : standard curve = 1
  4. Dilution factor: applied to unknowns =

Sample 1 = 5 (R² 1)

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