Uso De Espectroscopia De Ultravioleta Visível (Uv-Vis) Para a Detecção De Quercetina Em Plantas Por Meio Da Formação Do Complexo Quercetina-Alumínio

Abstract

Nine plant samples were studied from complexation reaction that occurs between aluminum from aluminum chloride (AlCl 3 ) and quercetin. The reaction shows yellow solution, which was spectroscopically evidenced by the bathochromic shift from 360-370 nm to 420-430 nm. Four samples of petals were investigated: white and magenta azalea, burnt yellow lily and dandelion; three leaf samples: aloe, orange and lime; and two peel samples: orange and lime fruits. Among the analyzed samples, only azalea (Rhododendron sp.) white and magenta petals had sufficient quercetin concentration to be detected by UV-Vis spectroscopy and analyzed by quercetin-aluminum complex formation. The interaction between aluminum and quercetin showed a stoichiometry of 2:1, with a binding constant of 3.94 ± 0.34 x 10 3 mol L -1 .

Síntese, caracterização e estudo in vitro do potencial de mineralização do composto Quercetina-Sr>sup<2+>/sup<

“…É possível verificar que a banda referente ao anel B sofreu deslocamento batocrômico, ocorrendo por volta de 409 nm. Tal evidência, como no grupo 3OH com a carbonila do anel C 94,95 .…”