AFRICAN MANGO GLYCOSIDICALLY BOUND VOLATILE COMPOUNDS

Carbohydrate and aglycon moieties released, respectively, by acid and enzymatic hydrolysis of African mango pulp extracts containing glycosi dically bound compounds were identified by TLC, GC, and GC/MS. Glucose was found to be the most important sugar constituent of the glycoside saccharidic moiety, while significant amounts of arabinose and trace amounts of rhamnose were detected. Several aglycons [(Z)-hexen-3-ol, h exanol, hexanoic acid, 2,5-dimethyl-4-hydroxy-3-(2H)furanone (furaneol ), linalool oxides, alpha-terpineol, carvacrol, vanillin, cis- and tra ns-6-p-menthen-2,8-diol, 1,8-p-menthadien-7-ol, 1-p-menthen-7,8-diol, and 9-hydroxymegastima-4-en-3-one] were identified as additional mango bound volatile compounds. Fatty acids (myristic and stearic acids) we re also found in glycosidically bound form. Ten glycosides (benzyl, 2- phenylethyl, and alpha-terpineyl glucosides and rutinosides, eugenyl, vanillyl and furaneyl glucosides and alpha-terpineyl arabinoglucoside] were identified for the first time in mango by GC/MS of trifluoroacet ylated derivatives and GC using reference compounds. Linalyl oxide glu cosides (four isomers) and C-13 norisoprenoid derivatives [9-hydroxyme gastima-4,6-dien-3-one (two isomers), 9-hydroxymegastima-4,7-dien-3-on e, and vomifoliol glucosides and arabinoglucosides] were tentatively i dentified.