Fractionation of aluminum in commercial green and roasted yerba mate samples ( Ilex paraguariensis St. Hil.) and in their infusions.
Different trademarks of green mate and mate tea ( Ilex paraguariensis St. Hil.) were employed in this work, the aim of which was to compare the fractionation of Al from green mate and mate tea (roasted mate) and from their infusions. Using the flame atomic absorption spectrometry technique, contents determined for Al leached to green mate and mate tea infusions varied from 12.8 to 18.1% and from 5.9 to 10.6%, respectively. The concentrations of phenolics in infusions were determined using the Folin-Ciocalteu method, and the presence of melanoidins was also evaluated. The results showed that phenolic compounds are the major contributors to the leached Al in green mate infusions, but melanoidins also contribute in the case of infusions prepared from the mate tea. By employing a chelating resin batch procedure, it was observed that Al was predominantly in relatively inert forms, mainly in the case of mate tea infusions (50-70%).
Gomes da Costa
Andrey Maldonado
AM
Departamento de Quimica, Universidade Estadual de Maringa, Avenida Colombo 5790, CEP 87020-900, Maringa, Parana, Brazil.
Nogami
Eurica Mary
EM
Visentainer
Jesui Vergilio
JV
de Souza
Nilson Evelazio
NE
Garcia
Edivaldo Egea
EE
D000535:Aluminum / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D001628:Beverages / Q000032:analysis; D005591:Chemical Fractionation; D005419:Flavonoids / Q000032:analysis; D006358:Hot Temperature; D030019:Ilex paraguariensis / Q000737:chemistry*; D010636:Phenols / Q000032:analysis; D011108:Polymers / Q000032:analysis; D059808:Polyphenols; D013054:Spectrophotometry, Atomic
D005419:Flavonoids; D010636:Phenols; D011108:Polymers; D059808:Polyphenols; C011908:melanoidin polymers; D000535:Aluminum