Chromatography and Spectroscopy Techniques

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Table of Content: Volume 4, Issue 1

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Research Article Pages 61-68

Characterization of Triterpenoid Saponins, Phenylethanoids and Flavonoids in Bacopa Caroliniana (Walt.) B.L. Robins Using LC-ESI-QTOF-MS/MS Technique

Authors: Nitra Nuengchamnong, Tongchai Saesong and Kornkanok Ingkaninan

Abstract: This research reports upon the chemical constituent of the aerial part of Bacopa caroliniana identified using the liquid chromatography with electrospray ionization/mass spectrometry (LC-ESI-QTOF-MS/MS) technique. The LC separation along with high resolution mass spectrometry data revealed significant differences in phytochemicals of B. caroliniana. The mass spectral fragmentation patterns in both positive and negative modes indicated the numbers

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Research Article Pages 48-60

Scattering and Absorption Coefficients of Biological Chlorophyll Pigmented Grains in Aqueous Suspension

Authors: Shirley Quirós Achí and William E Vargas Castro

Abstract: Chlorophyll pigmented grains were extracted from leaves of palm trees and maintained in aqueous solutions containing an organic solvent. Their transmittance spectra were measured for visible wavelengths, from 400 to 700 nm. Four dissolutions were prepared to consider different pigment concentrations. The transmittance measurements show a somewhat spectrally structured band between 474 and 650 nm, limited by the light extinction (scattering + absorption) due to the pigments.

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