%0 Journal Article
%T Antioxidant properties and color of Hibiscus sabdariffa extracts
%A Salazar-Gonz¨¢lez
%A Claudia
%A Vergara-Balderas
%A Fidel T
%A Ortega-Regules
%A Ana E
%A -Beltr¨¢n
%A Jos¨¦ ¨¢
%J Ciencia e investigaci¨®n agraria
%D 2012
%I Scientific Electronic Library Online
%R 10.4067/S0718-16202012000100006
%X liquid extracts of dried roselle (hibiscus sabdariffa) calyces obtained using ethanol:water (50:50 and 70:30%, v/v), water, ethanol:1.5 n hcl (85:25%, v/v), and ethanol (96%) to evaluate selected antioxidant characteristics (phenolic compounds and antioxidant capacity), color parameters (l, a, and b), and anthocyanins (delphinidin-3-o-sambubioside, delphinidin-3-o-glucoside (myrtillin), and cyanidin-3-o-sambubioside) by high performance liquid chromatography (hplc). the total monomeric anthocyanin content was also assessed using the differential ph technique. the phenolic compound content ranged from 1,067¡À22 (in ethanol) to 2,649¡À96 (in ethanol:water 70:30%) mg of gallic acid100 g-1 of dehydrated calyces, and the antioxidant capacity ranged from 3.11¡À0.50 (in ethanol) to 8.0¡À0.2 mmoles of trolox100 g-1 of calyces. the total monomeric anthocyanin content (209¡À21 mg100 g-1) was similar to that obtained using the hplc technique (215¡À31 mg100 g-1) when extracting the calyces with the 50:50% (v/v) ethanol:water solution. the deepest red-purple (hue = 62.50¡À0.34) colored solution was observed when extracting the calyces with ethanol. the antioxidant and color properties of roselle calyces make the extracts ideal for use in foods as a natural extract, concentrate, or powder.
%K anthocyanins
%K antioxidant capacity
%K cyanidin-3-o-sambubioside
%K delphinidin-3-o-sambubioside
%K delphinidin-3-o-glucoside
%K myrtillin
%K hibiscus sabdariffa
%K roselle calyces.
%U http://www.scielo.cl/scielo.php?script=sci_abstract&pid=S0718-16202012000100006&lng=en&nrm=iso&tlng=en