Isolation and Characterization of Flavonoids of the Ethanolic extracts of stems of Mimosa hamata (Willd.) by Chromatographic techniques

Since there are many bioactive compounds present in plant material containing various multi-component mixtures, their separation and determination is important to identify the active phytoconstituents responsible for pharmacological activity. Practically most of them have to be separated by column chromatographic techniques. The present study deals with the identification and characterization of bioactive principles from the stems of Mimosa hamata. The isolated fractions from the ethanolic extracts of stems of Mimosa hamata was carried out by column chromatography. For separation of a bioactive compound, the solvent system tried for column chromatography was Chloroform: Methanol in various ratios like 90:10, 80:20, 70:30, and 60:40 amongst these we could separate the first fraction at 80:20 and second fraction at 70:30. Two flavonoids compounds were isolated from the ethanolic extracts of stems of the medicinal plant Mimosa hamata (Willd). Based on chemical and spectral analyses their structures were elucidated as Quercetin and Cirsimaritin. From the above study it reveals the presence of flavonoids in the ethanolic extracts of stems of Mimosa hamata (Willd.) was isolated using column chromatography further subjected to characterization of isolated compounds including UV, IR, NMR and Mass spectroscopic study for elucidating the structure of the two separated compounds. The interpreted data concluded that, both isolated compounds are flavonoids i.e. Cirsimaritin and Quercetin. The pharmacological effect of Mimosa hamata stems may be due to the presence of its phytoconstituents flavonoids.

Low Energy Antikaon-nucleon/nuclei interaction studies by AMADEUS

The AMADEUS experiment at the DAΦNE collider of LNF-INFN deals with the investigation of the at-rest, or low-momentum, K− interactions in light nuclear targets, with the aim to constrain the low energy QCD models in the strangeness sector. The 0 step of the experiment consisted in the reanalysis of the 2004/2005 KLOE data, exploiting K− absorptions in H, 4He, 9Be and 12C, leading to the first invariant mass spectroscopic study with very low momentum (about 100 MeV) in-flight K− captures. With AMADEUS step 1 a dedicated pure Carbon target was implemented in the central region of the KLOE detector, providing a high statistic sample of pure at-rest K− nuclear interaction. The first measurement of the non-resonant transition amplitude $\left| {{A_{{K^ - }n \to \Lambda {\pi ^ - }}}} \right|$ at $\sqrt s = 33\,MeV$ below the K̄N threshold is presented, in relation with the Λ(1405) properties studies. The analysis procedure adopted in the serarch for K− multi-nucleon absorption cross sections and Branching Ratios will be also described.

A photoionization mass spectroscopic study on the formation of phosphanes in low temperature phosphine ices

A homologous series of phosphanes up to P8H10were detected by reflectron time-of-flight mass spectrometry with vacuum ultraviolet photoionization from irradiated phosphine ices.