Abstract
H. taltalense (Phil.) Johnst. (Heliotropiaceae) is an endemic species of the northern coast of Chile that produces a resinous exudate that covers its foliar surface and stems. Its chemical composition was analyzed for the first time, and two aromatic geranyl derivatives: filifolinol and filifolinyl senecionate and three flavonoids – naringenin, 3-O-methylgalangin and 7-O-methyleriodictiol – were isolated. The antioxidant activity of the flavonoids and the resinous exudates was carried out by measuring the 1,1-diphenyl-2-picrylhydrazyl (DPPH) bleaching effect in ethanolic solution and in sodium dodecyl sulfate (SDS) micelles. The influence of the reaction medium was analyzed. The initial velocity reactions for the pure compounds and for the extract were higher in SDS media than in ethanolic solution. The velocity of reaction observed was interpreted in terms of the reaction medium environment in the micelle.
Highlights
Heliotropium taltalense (Phil.) Johnst., family Heliotropiaceae, Cochranea section, is an endemic resinous bush that grows in the north of Chile
We report the results obtained on the evaluation of the antioxidant activity of the resinous exudate and the flavonoids isolated from Heliotropium taltalense Phil., using two different reaction media
Like that of other species of Heliotropium, this resinous exudate was characterized by the presence of flavonoids and aromatic geranyl derivatives
Summary
Heliotropium taltalense (Phil.) Johnst., family Heliotropiaceae, Cochranea section, is an endemic resinous bush that grows in the north of Chile. The antioxidant activity of this type of constituents of vegetable resinous exudates, where the complexity of the matrix and the presence of high solar ultraviolet radiation in the environment can make of them an important defense mechanism, has not been well studied In this regard, studies consisting in their antioxidant evaluation, have mostly been carried out in homogeneous systems, without considering their hydrophobic properties. This poor correlation can be attributed to the evaluation of total antioxidant charge in complex mixture that is extremely dependent upon the procedure employed, concluding that much care must be exercised in the interpretation of the results Based in these antecedents, we report the results obtained on the evaluation of the antioxidant activity of the resinous exudate and the flavonoids isolated from Heliotropium taltalense Phil., using two different reaction media. The phytochemical analysis of resinous exudates isolated from Heliotropium taltalense Phil. is reported for the first time
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