© Georg Thieme Verlag KG Stuttgart · New York
Phenolic Constituents in Dried Flowers of Aloe vera (Aloe barbadensis) and their in vitro Antioxidative Capacity
Received: February 9, 2007
Revised: April 4, 2007
Accepted: April 13, 2007
22 May 2007 (eFirst)
The dried flowers from Aloe vera (L.) Burm. f. (Aloe barbadensis Mill.) (Asphodelaceae) were analysed by means of HPLC-DAD and HPLC-MS/MS, verifying chlorogenic, caffeic, 5-p-coumaroylquinic, caffeoylshikimic, 5-feruloylquinic, 5-p-cis-coumaroylquinic, p-coumaric and ferulic acid as well as luteolin, apigenin, quercetin, kaempferol, isoorientin, isovitexin and their 7-O-glucosides, saponarin and lutonarin. On searching for anthranoids in the flower extract, aloe-emodin as well as the glycosylchromone aloeresin B could be identified. Aloin A and B, the laxative principle of the drug Curaçao-Aloes, are not accumulated in the dried flowers. The polyphenol content of three different batches was 0.73 - 1.01 % (± 0.05 %) and the flavonoid content 0.24 - 0.34 % (± 0.01 %). The hydrophilic antioxidative capacity amounted to 85.7 - 94.9 (± 0.5) μmol TEAC/g dried Aloe vera flower and was directly correlated with the polyphenol and flavonoid contents.
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Prof. Dr. Elisabeth Stahl-Biskup
Institute of Pharmacy
Division of Pharmaceutical Biology and Microbiology
University of Hamburg