This reagent, after preparation, can be stored for 3 months at 4˚C. It is quite common for the GOPOD reagent to change from a pale yellow colour when fresh to pale pink after storage overnight. The optical density at 510 nm should be approx. 0.05 or less. This does not affect the performance of the reagent. If you need to store 

Product Page (R-GLC4)

Product Page (K-GLUC)