I am performing a malonaldehyde assay using the TBAR method at 535nm and getting negative values. What can I do to correct this error?

I am getting both negative and positive values. Below is a sample of my results. DQ5a -0.042DQ5b -0.099DQ5c 0.166DQ5d 0.094DQ5e 0.122DQ10a 0.001DQ10b -0.16DQ10c -0.141DQ10d -0.116DQ10e -0.062DQ15a...

01 January 1970 2,890 3 View