African Mango Glycosidically Bound Volatile Compounds

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Abstract

Carbohydrate and aglycon moieties released, respectively, by acid and enzymatic hydrolysis of African mango pulp extracts containing glycosidically 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, hexanol, hexanoic acid, 2,5-dimethyl-4-hydroxy-3-(2H)furanone (furaneol), linalool oxides, α-terpineol, carvacrol, vanillin, cis- and trans-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) were also found in glycosidically bound form. Ten glycosides (benzyl, 2-phenylethyl, and α-terpineyl glucosides and rutinosides, eugenyl, vanillyl and furaneyl glucosides and α-terpineyl arabinoglucoside] were identified for the first time in mango by GC/MS of trifluoroacetylated derivatives and GC using reference compounds. Linalyl oxide glucosides (four isomers) and C13 norisoprenoid derivatives [9-hydroxymegastima-4,6-dien-3-one (two isomers), 9-hydroxymegastima-4,7-dien-3-one, and vomifoliol glucosides and arabinoglucosides] were tentatively identified. Keywords: Mango; glycosidically bound compounds; TFA derivatives; GC/MS

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