Simultaneously verifying the original region of green and roasted coffee beans is very important for protecting legal interests stakeholder according to chemical analyzing method. 131 bean samples are collected from six different regions pretreated with three degrees (green, middle, dark roasted); five stable isotope ratios (δ13C, δ14N, δ18O, δ2H, δ32S) twelve elemental contents (Al, Cr, Ni, Zn...

Sequential phosphorus (P) fractionation procedures are one of the most widely used wet chemical methods for characterizing P pools in soils and sediments, but have also been criticized repeatedly their lack accuracy to measure chemically specified phosphate fractions. In recent investigation, sediments from two different sample locations with same pretreatments were analyzed sequential fraction...

Abstract Crude oil is a complex mixture that includes polycyclic aromatic hydrocarbons (PAHs) as one of its major components. The toxicity some chemically substituted PAHs found in oil, such the methylated species, are relatively understudied. A combination chemical fractionation and analysis coupled with bioassay was used to identify subset activated aryl hydrocarbon receptor (AHR). Silica gel...

In vivo and in vitro properties of the Transfer Factor (TF) and Migration Inhibition Factor (MIF) obtained from 2,4-dinitrofluorobenzene (2,4-DNFB) and tuberculin systems were studied simultaneously. Purified fractions of TF and MIF were obtained by Geon-Pevikon block electrophoresis and Sephadex G-200 exclusion chromatography. The physical and biological properties of these purified fractions ...

In the past few years several methods have been developed for the analysis of serum lipoproteins. Lindgren, Elliott, and Gofman (1) have utilized the relatively low density of the lipoproteins to separate them from the other serum proteins by ultracentrifugal flotation. Quantitation was subsequently performed by refractometric methods in the analytical ultracentrifuge. Separations of lipoprotei...

The phosphorus (P) composition of sediment profiles in three subtropical lakes of contrasting trophic state in Florida, USA, was determined by sequential fractionation and solution P NMR spectroscopy. Sediment from Lake Annie, an oligo-mesotrophic sinkhole with moderately acidic sediment (pH 5.4; loss on ignition 58 %), contained higher total P concentrations than sediment from eutrophic Lake O...

In the past few years several methods have been developed for the analysis of serum lipoproteins. Lindgren, Elliott, and Gofman (1) have utilized the relatively low density of the lipoproteins to separate them from the other serum proteins by ultracentrifugal flotation. Quantitation was subsequently performed by refractometric methods in the analytical ultracentrifuge. Separations of lipoprotei...

One of the most important tools to investigate chemical history our Galaxy and own Solar System is measure isotopic fractionation elements. This process that distributes less abundant stable isotopes an element in different molecules. The ratios are governed by two main processes: 1. evolution whole due stellar nucleosynthesis; 2. local effects. In this Proceeding we report some results highlig...