A spectroscopic investigation of the phenolcarboxylic acids ofCynara scolymus
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Spectroscopic investigations in the UV region of the phenolcarboxylic acids that we have isolated from the leaves ofCynara scolymus have been carried out. It has been found that:
1. Free caffeic acid can be distinguished from its esters by the changes in the UV spectra under the influence of sodium ethoxide and sodium acetate.
2. An o-dihydroxy grouping in esters can be detected from the bathochromic shift observed with boric acid in the presence of sodium acetate.
3. An o-dihydroxy grouping can be detected both in esters and in the free acid under the influence of aluminum chloride.
KeywordsCaffeic Acid Sodium Acetate Aluminum Chloride Carboxy Group Quinic Acid
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- 1.K. Herrmann, Die Pharmazie, no. 5, 266, 1958.Google Scholar