Udp disodium salt

Chemicals were from Carl Roth (Karlsruhe,
Germany) and Sigma-Aldrich (Vienna, Austria) in highest purity available.
UDP disodium salt, UDP-d-glucose disodium salt, UDP-d-glucuronic acid ammonium salt, 7-amino-4-methylcoumarin, and phloretin
(98%) were from Carbosynth (Berkshire, UK). 4-Methylumbelliferone
(≥98%) was from Sigma-Aldrich.

Chemicals were from Carl Roth
(Karlsruhe, Germany) and Sigma-Aldrich (Vienna, Austria). 4MU (3, Figure 1; ≥98%), 4NP (4, Figure 1; ≥99%) and 4NP-β-d-glucoside (≥98%) were from Sigma-Aldrich. 4MU-β-d-glucoside, UDP disodium salt, and UDP-glucose disodium salt
were from Carbosynth (Compton, U.K.). 15HCM (1, Figure 1; ≥99.5%)
and 15HCM β-d-glucoside (5, Figure 1; ≥99%) were provided
by BASF. Note: 15HCM is a racemic mixture of the (3R, 5R, 6S) and (3S, 5S, 6R) forms (Figure 1). 15HCM and the glycosylated
derivatives thereof are toxic and irritant. Proper care was taken
in their handling. Calf intestine phosphatase (CIP, 10 000
U/mL) was from New England Biolabs (Frankfurt am Main, Germany).