Composition and Antioxidant Activity of Geopropolis Collected by Melipona subnitida (Jandaíra) Bees.
An investigation of the geopropolis collected by Melipona subnitida (jandaíra) stingless bee led to the isolation and characterization of two phenylpropanoids, 6-O-p-coumaroyl-D-galactopyranose (1) and 6-O-cinnamoyl-1-O-p-coumaroyl- β -D-glucopyranose (2), and seven flavonoids, 7-O-methyl-naringenin (3), 7-O-methyl aromadendrin (4), 7,4'-di-O-methyl aromadendrin (5), 4'-O-methyl kaempferol (6), 3-O-methyl quercetin (7), 5-O-methyl aromadendrin (8), and 5-O-methyl kaempferol (9). The structure of the new phenylpropanoid (1) was established from IR, LC-ESI-MS, and NMR spectral data, including 2D NMR experiments. The extract and fractions demonstrated significant antioxidant activity in DPPH, ABTS, and β -carotene/linoleic acid tests.
Laboratório de Bioprospecção Fitoquímica, Departamento de Ciências Moleculares, Universidade Federal Rural de Pernambuco, 52171-900 Recife, PE, Brazil.
Silvana
S
Alves de Souza
Celso Amorim
CA
Camara
Eva
E
Monica Sarmento da Silva
Tania Maria Sarmento
TM
Silva