I am expressing a extracellular protein and the media is colored. So when I used nanospectrophotometer, for blank (media) it showed high absorbance >340 nm and couldnot measure it. So I diluted it in distilled water by 1/20, also I did same for the sample. But when I ran the 1/20 diluted sample it didnot show the concentration, it was only baseline. Please help.