- Did not see mass unit 53 in LC/MS chromatograms using a different reverse-phase column and TFA mobile phase additive.
- BioResolve RP mAb
- IonHance DFA
Ammonium chloride, iron at elevated levels. Customer used Milli-Q water system and glass mobile phase containers.
FIX or WORKAROUND
Use of LC/MS water recommended to reduce prevalence of ions.
Use of LDPE containers (186009110) recommended.
Milli-Q water systems use a municipality source and deionize the water. Municipality, system-wide water flushes produce larger amounts of ions in the water. The lab Milli-Q and TOC readings were within specification for HPLC-grade water.
eluent, monoclonal antibody