Fig. 4

Production of caffeyl alcohol in immobilized cells. a Caffeic acid (S2), detected under 340 nm; b caffeic acid (S2), detected under 280 nm; c reaction product of caffeic acid, detected under 340 nm (P1); d reaction product of caffeic acid, detected under 280 nm (P2); e MS/MS profile of caffeldehyde under the ESI positive scan mode (P1); f MS/MS profile of caffeyl alcohol under the ESI negative scan mode (P2)