betulonic acid/breza

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[Genotoxic and Mutagenic Properties of Synthetic Betulinic and Betulonic Acids].

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Prijava / prijava

Synthesis of betulinic acid was performed from the birch bark extract (Betula pendula). Betulonic acid was intermediate of the synthesis. Both acids were isolated with purity 95%. Genotoxicity and mutagenicity of obtained compounds were analyzed by Ames test and SOS chromotest, none of these

Selective ultrasound-assisted extractions of lipophilic constituents from Betula alleghaniensis and B. papyrifera wood at low temperatures.

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Prijava / prijava

Betula alleghaniensis and B. papyrifera are widely distributed in the province of Québec (Canada) and, since these trees are valuable exports for the local lumber industry, large amounts of their residual ligneous biomass are available for further exploitation. Betula species are well known for

Microbial transformations of two lupane-type triterpenes and anti-tumor-promoting effects of the transformation products.

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Prijava / prijava

Microbial transformation of betulin (1), a lupane-type triterpene obtained from the bark extract of white birch (Betula platyphylla Sukatshev var. japonica), and its chemical oxidation product, betulonic acid (2), by the fungus Chaetomium longirostre yielded

Chemical profiles of birch and alder bark by ambient mass spectrometry.

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Desorption atmospheric pressure photoionization (DAPPI) is an ambient mass spectrometry (MS) technique that allows the analysis of both polar and nonpolar compounds directly from the surfaces of various sample types. Here, DAPPI was used to study the chemical profiles in different parts of birch and

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