Figure 4From: Dual-lifetime referencing (DLR): a powerful method for on-line measurement of internal pH in carrier-bound immobilized biocatalystsEffect of Ru(dpp) loading (relative to fluorescein) on phase shift in DLR. Experiments were performed in 50 mM PPB (pH 8.0) at 37°C. A constant fluorescein load of 2.5 mg/g dry carrier was applied. Modulation frequency was 45 kHz.Back to article page