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Identificatin and quantiative analysis of amyrins in Humulus lupulus L.

100%
Rokicka K., Wojciak-Kosior M.
Current Issues in Pharmacy and Medical Sciences
|
2014
|
vol. 27
|
issue 3
142-144
EN
In the paper, the identification and quantification of α- and β-amyrin in five varieties of Humulus lupulus is described. The plant samples were extracted with ethyl acetate and analyzed using of high performance liquid chromatography (HPLC) with PAD detection. The separation was achieved on RP 18 column, at 2 mL/min flow rate and at temperature of 35°C. Acetonitrile was used as a mobile phase. The established calibration curves and the other validation parameters: linearity (correlation coefficient r > 0.9988) and precision (RSD values ranged from 0.14 to 1.81%) were found to be satisfactory for the proposed method. The content of α- and β-amyrin strongly depended on varieties of H. lupulus and amounted from 72.7 to 232.5 μg/g and from 77.9 to 176.9 μg/g of dry plant material, respectively.
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Determination of caffeic acid in root and rhizome of Black cohosh (Cimicifuga racemosa (L.) Nutt.)

81%
Zapala K., Szymczak G., Wojciak-Kosior M.
Current Issues in Pharmacy and Medical Sciences
|
2014
|
vol. 27
|
issue 2
108-110
EN
Cimicifuga racemosa, is a plant with a diverse and long history of medicinal use. Caffeic acid, bioactive compound, which often occurs with other polyphenols can influence the biological activity of this plant. The aim of our work was quantitative analysis of caffeic acid in roots and rhizomes of two varieties of C. racemosa. Analysis was performed by HPLC method. The extracts were separated on C18 reversed-phase column using mixture of methanol, water and formic acid (25:75:0.5 v/v/v) as a mobile phase. The flow rate of eluent was 1.0 ml·min-1. The obtained validation parameters such as linearity, linear regression equation and precision expressed as a relative standard deviation were adequate for quantitative determination. Caffeic acid was found in all tested extracts. The highest total amount of caffeic acid was determined in C. racemosa var. racemosa (255.3 μg·g-1) while its concentration in C. racemosa var. cordifolia was significantly lower (213.0 μg·g-1).
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