http://www.revistadechimie.ro 557 Woody biomass is the most abundant renewable resource and can be used for alternative energy sources and chemicals [1-4]. The major components of wood are: cellulose, hemicellulose and lignin [5-8]. Cellulose and hemicellulose could be chemical [9-10], biochemical [11], physic [12] and physico-chemical [13-15] depolymerized to sugars. Most of the chemical trans...

The high-pressure liquid chromatographic separation of ail of the known metabolites of vitamin D2 and vitamin D3 found in biological fluids has been achieved. This technique has been successfully applied to the analysis of vitamin D mixtures, purification of vitamin D metabolites, and identification of radioactive peaks. Some theoretical bases for the observed resolutions are suggested. Supplem...

two dimensional thin layer chromatography on polyamide sheets is a useful method for identification of pth-amino acids which have very close rf-values. the solvent systems described here are particularly effective and have an edge over other solvent systems used for the separation of pth-amino acids. the solvent systems provide a clear separation of all pth-amono acids except lle / leu in a rel...

Было изучено хроматографическое поведение гидроксиантрахинонов. Хорошее разделение было достигнуто при использовании предложенных новых хроматографических систем: бумажная хроматография смесью уксусной кислоты и воды на простой бумаге или бумаге импрегнированной оливковым мас­ лом, тонкослойная хроматография на целлюлозе импрегнированной диметилформамидом и на силикагеле без или с импрегнацией ...

A h igh-per formance l i q u i d chromatography (HPLC) method has been deve loped f o r t h e s e p a r a t i o n of o l e f i n , s a t u r a t e , and a r o m a t i c hydrocarbons found i n h i g h b o i l i n g d i s t i l l a t e s and r e s i d u e s of s h a l e o i l and i n whole s h a l e o i l s . The dual-column chromatographic system uses s i l i c a g e l i n one column and s i l i...

Affinity chromatography is a type of liquid chromatography that makes use of biological-like interactions for the separation and specific analysis of sample components. This review describes the basic principles of affinity chromatography and examines its use in the testing of clinical samples, with an emphasis on HPLC-based methods. Some traditional applications of this approach include the us...

Chromatographic procedures were developed and successfully employed for the separation of a high number of organic and inorganic compounds present at trace level in complicated accompanying matrices. The capacity of chromatographic separation technologies can be increased by the modification of both the stationary and the mobile phase of the system. Because of their specific adsorption characte...

Chromatographic procedures were developed and successfully employed for the separation of a high number of organic and inorganic compounds present at trace level in complicated accompanying matrices. The capacity of chromatographic separation technologies can be increased by the modification of both the stationary and the mobile phase of the system. Because of their specific adsorption characte...