Quantitative Analysis of Flavonoids in Chamomile Flowers (Matricaria chamomilla L.) by Microcolumn HPLC-UV

Kinetics and Mechanism of Epinephrine Autoxidation in the Presence of Plant Superoxide Inhibitors: A New Look at the Methodology of Using a Model System in Biological and Chemical Research

“…Therewith, 2-hydroxy-4-methoxycinnamic acid, an isomer of ferulic acid (which is 4-hydroxy-3-methoxycinnamate), could undergo intramolecular cyclization with the corresponding coumarin ring closure to yield 7-methoxycoumarin. A comparison of our findings obtained from the peaks 2, 3, and 9 UV and MS spectra ( Figure 10 ) with the results gained by Weber et al in 2008 [ 38 ] appears to be indicative of the presence of those compounds in our aqueous–propylene glycolic extract.…”

“…With allowance for the presumed formula C 22 H 30 O 12 (molecular ion [M + H] + mass equal to 487.1791, Δ = −3.9 ppm) and the absorption maximum in UV spectra at 280 nm, peak 1 (retention time 7.2 min) could be attributed to diglucoside of a mononuclear phenolic compound. As the major components of water–ethanolic extracts from the Matricaria chamomilla plant material, apigenin and its derivatives are referred to in the scientific literature [ 38 ], which appears to be true also for the aqueous–propylene glycolic extract from the chamomile plant that we studied in this work. Thus, both aqueous solvents and mixtures with propylene glycol or ethanol essentially yield the same major extractable components when serving as the extracting agents to treat this plant material.…”