Sinapine is an alkaloidal amine found in black mustard seeds. It is considered a choline

Choline

Choline is a water-soluble essential nutrient. It is usually grouped within the B-complex vitamins. Choline generally refers to the various quaternary ammonium salts containing the N,N,N-trimethylethanolammonium cation....

 ester of sinapic acid.

Sinapine was discovered by Etienne Ossian Henry

Etienne Ossian Henry

Etienne Ossian Henry was a French chemist, son of Nöel Etienne Henry , born in Paris, and trained by his father, who was director of the Central Pharmacy of the Parisian hospitals and professor in the School of Pharmacy. In 1824 he became director of the chemical laboratory of the Academy of...

 in 1825.

Metabolism

Sinapine esterase

Sinapine esterase

In enzymology, a sinapine esterase is an enzyme that catalyzes the chemical reactionThus, the two substrates of this enzyme are sinapoylcholine and H2O, whereas its two products are sinapate and choline....

 is an enzyme whose two substrates are sinapoylcholine (sinapine) and H₂O and whose two products are sinapate (sinapic acid) and choline

Choline

Choline is a water-soluble essential nutrient. It is usually grouped within the B-complex vitamins. Choline generally refers to the various quaternary ammonium salts containing the N,N,N-trimethylethanolammonium cation....

.

Sinapoylglucose—choline O-sinapoyltransferase is an enzyme whose two substrates are 1-O-sinapoyl-beta-D-glucose and choline

Choline

Choline is a water-soluble essential nutrient. It is usually grouped within the B-complex vitamins. Choline generally refers to the various quaternary ammonium salts containing the N,N,N-trimethylethanolammonium cation....

, whereas its two products are D-glucose and sinapoylcholine (sinapine).