RELEVANCE OF SECONDARY PROCESSES IN ORAC VALUES OBTAINED EMPLOYING PYROGALLOL RED AS TARGET MOLECULE

Pyrogallol red (PGR) is readily bleached by peroxyl radicals . Addition of cinnamic acid derivatives (coumaric, caffeic, ferulic and sinapic acids), even at relatively high concentrations, barely protects PGR from bleaching, given very low ORAC (oxygen radical absorbance capacity) values. This lack...

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Autores principales:	LÓPEZ-ALARCÓN,C, ASPEÉ,A, LISSI,E.A
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2009
Materias:	ORAC pyrogallol red secondary reactions cinnamic acid derivatives
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072009000100003
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spelling	oai:scielo:S0717-970720090001000032009-05-12RELEVANCE OF SECONDARY PROCESSES IN ORAC VALUES OBTAINED EMPLOYING PYROGALLOL RED AS TARGET MOLECULELÓPEZ-ALARCÓN,CASPEÉ,ALISSI,E.A ORAC pyrogallol red secondary reactions cinnamic acid derivatives Pyrogallol red (PGR) is readily bleached by peroxyl radicals . Addition of cinnamic acid derivatives (coumaric, caffeic, ferulic and sinapic acids), even at relatively high concentrations, barely protects PGR from bleaching, given very low ORAC (oxygen radical absorbance capacity) values. This lack of protection is contrary to that expected from the relative reactivity of cinnamic acid derivatives and PGR. It is concluded that the protection is not determined by competition of the antioxidant and the target molecule for peroxyl radicals , but for secondary processes involving phenoxyl and PGR derived radicals . In particular, the occurrence of processes such as <img border=0 width=247 height=22 src="http://fbpe/img/jcchems/v54n1/form03-01a.jpg"> can explain the lack of PGR protection even in conditions where most of the peroxyl radicals are trapped by the additive.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.54 n.1 20092009-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072009000100003en10.4067/S0717-97072009000100003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	ORAC pyrogallol red secondary reactions cinnamic acid derivatives
spellingShingle	ORAC pyrogallol red secondary reactions cinnamic acid derivatives LÓPEZ-ALARCÓN,C ASPEÉ,A LISSI,E.A RELEVANCE OF SECONDARY PROCESSES IN ORAC VALUES OBTAINED EMPLOYING PYROGALLOL RED AS TARGET MOLECULE
description	Pyrogallol red (PGR) is readily bleached by peroxyl radicals . Addition of cinnamic acid derivatives (coumaric, caffeic, ferulic and sinapic acids), even at relatively high concentrations, barely protects PGR from bleaching, given very low ORAC (oxygen radical absorbance capacity) values. This lack of protection is contrary to that expected from the relative reactivity of cinnamic acid derivatives and PGR. It is concluded that the protection is not determined by competition of the antioxidant and the target molecule for peroxyl radicals , but for secondary processes involving phenoxyl and PGR derived radicals . In particular, the occurrence of processes such as <img border=0 width=247 height=22 src="http://fbpe/img/jcchems/v54n1/form03-01a.jpg"> can explain the lack of PGR protection even in conditions where most of the peroxyl radicals are trapped by the additive.
author	LÓPEZ-ALARCÓN,C ASPEÉ,A LISSI,E.A
author_facet	LÓPEZ-ALARCÓN,C ASPEÉ,A LISSI,E.A
author_sort	LÓPEZ-ALARCÓN,C
title	RELEVANCE OF SECONDARY PROCESSES IN ORAC VALUES OBTAINED EMPLOYING PYROGALLOL RED AS TARGET MOLECULE
title_short	RELEVANCE OF SECONDARY PROCESSES IN ORAC VALUES OBTAINED EMPLOYING PYROGALLOL RED AS TARGET MOLECULE
title_full	RELEVANCE OF SECONDARY PROCESSES IN ORAC VALUES OBTAINED EMPLOYING PYROGALLOL RED AS TARGET MOLECULE
title_fullStr	RELEVANCE OF SECONDARY PROCESSES IN ORAC VALUES OBTAINED EMPLOYING PYROGALLOL RED AS TARGET MOLECULE
title_full_unstemmed	RELEVANCE OF SECONDARY PROCESSES IN ORAC VALUES OBTAINED EMPLOYING PYROGALLOL RED AS TARGET MOLECULE
title_sort	relevance of secondary processes in orac values obtained employing pyrogallol red as target molecule
publisher	Sociedad Chilena de Química
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072009000100003
work_keys_str_mv	AT lopezalarconc relevanceofsecondaryprocessesinoracvaluesobtainedemployingpyrogallolredastargetmolecule AT aspeea relevanceofsecondaryprocessesinoracvaluesobtainedemployingpyrogallolredastargetmolecule AT lissiea relevanceofsecondaryprocessesinoracvaluesobtainedemployingpyrogallolredastargetmolecule
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RELEVANCE OF SECONDARY PROCESSES IN ORAC VALUES OBTAINED EMPLOYING PYROGALLOL RED AS TARGET MOLECULE

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