Cypex UGT1A6 QC Assays

Substrate: 1-naphthol

Incubation conditions
Assay buffer: 0.05 M potassium phosphate pH 7.4, 10 mM MgCl₂, 5 mM saccharolactone
Incubation volume: 200 µl
Stop reagent: acetonitrile (100 µl)

HPLC conditions
Column: Hypersil ODS (5 µm) 250 x 4 mm
Temperature: 30°C
Mobile phase: 2% acetic acid/water/acetonitrile, 40/40/20 (v/v/v) (initial)
Separation type: Gradient
Flow rate: 1.0 ml/min
Run time: 13 min
Injection volume: 20 µl
Detection: fluorescence l(ex) = 280 nm, l(em) = 335 nm
Retention times:
       1-naphthylglucuronide      5.4 min
     1-naphthol                      7.9 min

Substrate: 4-methylumbelliferone (4-MU)

Incubation conditions
Assay buffer: 0.05 M potassium phosphate pH 7.4, 10 mM MgCl₂, 5 mM saccharolactone
Incubation volume: 200 µl
Stop reagent: 1 M hydrochloric acid (20 µl)

HPLC conditions
Column: Hypersil ODS (5 µm) 250 x 4 mm
Temperature: 30°C
Mobile phase: 0.05% orthophosphoric acid/acetonitrile (gradient separation)
Flow rate: 1.0 ml/min
Run time: 15.0 min
Injection volume: 10 µl
Detection: fluorescence l(ex) = 315 nm, l(em) = 375 nm
Retention times:
       4-MU glucuronide               3.8 min
     4-methylumbelliferone        8.9 min

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United States Patent Nos. 4,952,496, 5,693,489 and 5,869,320.