Why does the color of RPMI medium change very fast during the culture?

I'm using RPMI 1640 media from Sigma-Aldrich. Within 24 hours of incubation (37℃, 5% CO2) of DG44-CHO cells the color of the media is changing to yellow even with very low density of cells. I have...

05 May 2019 3,222 2 View