National Institute of Chemical Pharmaceutical RandD

Bucharest, Romania

National Institute of Chemical Pharmaceutical RandD

Bucharest, Romania

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Pirvu L.,National Institute of Chemical Pharmaceutical RandD | Hlevca C.,National Institute of Chemical Pharmaceutical RandD | Nicu I.,National Institute of Chemical Pharmaceutical RandD | Bubueanu C.,National Institute of Chemical Pharmaceutical RandD
Journal of Planar Chromatography - Modern TLC | Year: 2014

Given the large applicability in both pharmaceutical and cosmetic field, this work was aimed at analytical (high-performance thin-layer chromatography [HPTLC] method), antioxidant (2,2-diphenyl- 1-picrylhydrazyl [DPPH] method), and antimicrobial (diffusion method on Staphylococcus aureus ATCC 6538, Escherichia coli ATCC 8739, and Candida albicans ATCC 10231) studies on a series of whole vegetal extracts and corresponding aqueous, ethyl acetate and chloroform fractions (selective extracts) prepared from eight plant species growing in Romania. Briefly, it was revealed moderate to certain activity against S. aureus ATCC 6538 and E. coli ATCC 8739 in the case of greater burdock leaves (Arctium lappa), beech leaves (Fagus sylvatica) and great willowherb aerial part (Epilobium hirsutum) whole extracts. Purple loosestrife aerial part (Lythrum salicaria) and sea-buckthorn leaves (Hippophae rhamnoides) whole extracts showed only weak activity against these bacteria, while tarragon aerial part (Artemisia dracunculoides), chokeberries leaves (Aronia melanocarpa) and quince fruit (Cydonia oblonga) whole extracts have not shown activity. Subsequently studies on the selective extracts have revealed that combinations of glycosides of the same aglycones lead to very different antimicrobial properties indicating synergistic effects between polyphenols (demonstrated in the case of Fagus sylvatica extracts) or the contribution of other phytocompounds to the final effect (demonstrated in the case of Arctium lappa extracts) and, secondly, that the glycosyl chain in which they occur may also contribute to the final antimicrobial effect (demonstrated by the fact that the most active vegetal extracts emphasized the dominance of flavonoid monoglycosides). Moreover, inhibitory antimicrobial effects were revealed (Arctium lappa extracts). Finally, none of the studied extracts acted against C. albicans ATCC 10231. Concerning antioxidant activity, DPPH tests indicated high potency of all tested extracts (IC50 measuring from 2.66 to 4.80). Further studies on the most active vegetal extracts which aim to reveal MICs values and potential inhibitory or activatory effects in combination with chemical antibiotics are ongoing. © Akadémiai Kiadó, Budapest.


Pirvu L.,National Institute of Chemical Pharmaceutical RandD | Grigore A.,National Institute of Chemical Pharmaceutical RandD | Bubueanu C.,National Institute of Chemical Pharmaceutical RandD | Draghici E.,National Institute of Chemical Pharmaceutical RandD
Journal of Planar Chromatography - Modern TLC | Year: 2013

This paper was aimed at analytical and antioxidant activity studies on a series of European beech (Fagus sylvatica L.) leaves extracts in order to select the most proper period of raw material harvesting and corresponding technological approach in the final purpose of obtaining some extracts with high antioxidant effect useful as new, industrial material protecting products. Thus, comparative thinlayer liquid chromatography (TLC) studies on five series of (70%) ethanol macerates (tinctures), corresponding to the five periods of beech leaves harvesting (May-July-September-early October-late October) revealed caffeic acid (chlorogenic acid isomers), apigenin, kaempferol, quercetin, and catechin derivates as being the common polyphenolic species; it must be mentioned that while spring leaves revealed the dominance of one major kaempferol diglycoside and only traces of chlorogenic acid and apigenin derivates, summer to early autumn leaves have shown the abundance of chlorogenic acid isomers and an increasing number of apigenin derivates, as well as the appearing of one new major kaempferol mono-glycoside; different, autumn late leaves emphasized the decline of chlorogenic acid isomers versus the augmentation of summer apigenin derivates, as of two quercetin and catechin derivates, visualized only as traces in summer to early autumn samples. Further, quantitative assays indicated total phenols contents (expressed as gallic acid equivalents/GAE) of 7.04-11.61-33.55-9.40-5.81 mg g-1 GAE and total flavonoids contents (expressed as rutin equivalents/RE) of 12.40-9.02-5.71-2.22- 2.19 mg g-1 RE; among flavonoids, kaempferol glycosides levels of 2.92-2.01-1.38-0.52-0.17 mg g-1 were estimated (mean values). Once established September time as the most suitable period for leaves harvesting, antioxidant activity (AA) assessments of the subsequently beech leaves hot (70%) ethanol extracts indicated polar extracts as being moderate to augmented antioxidant products (49% â≤ AA â≤ 96%); differently, non-polar extracts indicated an augmented pro-oxidant effect (AA = -71%). The obtained results formed the foundation of new, anti-scale/anti-corrosion products based on beech leaves extracts. © 2013 Akadémiai Kiadó, Budapest.

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