Trigonelline biosynthesis and the pyridine nucleotide cycle in Coffea arabica fruits: Metabolic fate of [carboxyl-14C]nicotinic acid riboside

► The metabolic fate of [carboxyl-14C]nicotinic acid riboside was investigated. ► Nicotinic acid riboside is utilized efficiently for NAD synthesis in coffee fruits. ► Trigonelline is synthesized mainly from nicotinic acid delivered from NAD.