A new mode of operation for the Aerodyne Quadrupole Aerosol Mass Spectrometer (Q-AMS) has been developed and used to improve the detection limits and time resolution of the instrument. The Jump Mass Spectrum (JMS) mode works by stepping through a small number of specific user defined positions within the mass spectrum, increasing the time spent scanning specific m/z’s. The JMS mode is conceptua...

Licorice is obtained from the roots of several species Glycyrrhiza (Fabaceae), a genus containing about 20 species. The Chinese Pharmacopeia specifies three (G. glabra, G. uralensis, inflata). In an effort to unambiguously differentiate five inflata, echinata, and lepidota), LC-QToF method integrated with chemometric tools has been applied, based on chemical profiling two major classes saponins...

HPLC-DAD coupled with mass spectrometry in the positive ionization mode was applied to study the fragmentation of twelve selected flavonoids. Compounds belonging to all the major subgroups found in common plants, i.e. flavonols, flavones, dihydroflavonols, flavanones and flavanols were studied. Compound standards were injected into the spectrometer and produced characteristic mass spectra. The ...

Lanostane-triterpene acids obtained from the culture of the fungus Coriolellus malicola were studied by electrospray mass spectrometry in the negative ion mode using quadrupole time-of-flight and quadrupole ion trap analysers. Despite the differences observed in the mass spectra recorded with these instruments, a set of fragment ions was found to be characteristic of the family, depending on th...

Far-UV-induced formation of dimeric pyrimidine photoproducts within DNA is a major cause of the carcinogenic effects of solar light. The chemical structure of this class of lesion has been mostly determined by studies on model compounds. The present work is aimed at providing mass spectrometry data on the thymine-thymine photoproducts, including the diastereoisomers of the cyclobutane dimer, th...

: The identification of small molecules from mass spectrometry (MS) data remains a major challenge in the interpretation of MS data. This review covers the computational aspects of identifying small molecules, from the identification of a compound searching a reference spectral library, to the structural elucidation of unknowns. In detail, we describe the basic principles and pitfalls of search...

Suitable pattern design of drilling and blasting is very important in open pit mines. Using explosive energy for rock fragmentation with minimum cost production one the purposes The most parameters are including diameter hole, specific charge, burden thickness suitable dimensions fragmentation. In this paper, charge calculated based on quality mass then definition maximum mines calculated. a ne...