Abstract
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
Bundesstrasse 45
20146 Hamburg
Germany
Phone: +49-40-42838-3896
Fax: +49-40-42838-3895
Email: elisabeth.stahl-biskup@uni-hamburg.de