Publications by authors named "H M Navickiene"
Article Synopsis
- The isobutyl amides derived from Piper tuberculatum, namely pellitorine (compound 1) and 4,5-dihydropiperlonguminine (compound 2), were extracted with yields of 6.10% and 4.45%, respectively.
- The toxicity of these compounds and plant extracts against the velvetbean caterpillar was tested, showing that extracts caused 80% mortality at doses above 800 micrograms per insect, while compound 1 and compound 2 led to 100% mortality at lower doses of 200 and 700 micrograms per insect, respectively.
- The study established the LD(50) and LD(90) values for both compounds, suggesting potential as efficient insect
Quantitative determination of anti-fungal and insecticide amides in adult plants, plantlets and callus from Piper tuberculatum by reverse-phase high-performance liquid chromatography.
Phytochem Anal
December 2003
A rapid, sensitive and reliable reverse-phase HPLC method was used for the quantitative determination of the anti-fungal and insecticide amides, dihydropiplartine (1), piplartine (2), deltaalpha,beta-dihydropiperine (3) and pellitorine (4) in plants in natura, in plantlets in vitro and ex vitro, and in callus of Piper tuberculatum. Well-resolved peaks were obtained with good detection response and linearity in the range of 15.0-3000 microg/mL.
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- The study focuses on isolating various amides from the Piperaceae family, specifically from the leaves of Piper arboreum and Piper tuberculatum.
- Two new amides were discovered, along with several known compounds, and additional amides were synthesized through catalytic hydrogenation.
- The isolated compounds exhibited antifungal properties, particularly against the fungi Cladosporium sphaerospermum and C. cladosporioides.
Piper hispidum and Piper tuberculatum accumulate amides bearing isobutyl, pyrrolidine, dihydropyridone and piperidine moieties. The isolation and characterization of several representatives including two hitherto unreported amides were performed by chromatographic techniques and by analysis of spectroscopic data. The antifungal activity of each amide was determined by direct bioautography against Cladosporium sphaerospermum.
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