Disposable reversed-phase chromatography columns were tested for their effectiveness in removing unreacted trichloroethanol (TCE) from derivatized samples for gas-liquid chromatography analysis. Derivatized acidic chloroform extracts of saponified whole cells of Mycobacterium species, spent culture media, and derivatized acidic chloroform extracts of serum and cerebrospinal fluids from patients...

Preparation of microfibre constructs of collagen by electrospinning has been problematic due to the instability of collagen in volatile solvents, such as 1,1,1,3,3,3-hexafluoro-2-propanol, so that electrospinning leads to a substantial amount of gelatin fibres. In the present study we have demonstrated the production of collagen-based microfibre constructs by use of a layer-by-layer coating pro...

Microwave heating treatment was the one type of pretreatment process used in manufacture bioethanol because it can be applied singly or combination with other chemicals. The purpose this study to determine effect microwave on using acid and alkaline solvents. research carried out two stages, namely preparation raw materials microwave. At stage materials, bagasse dried for 2 days then crushed a ...

Well-established label in biomolecules analysis, fluorescein isothiocyanate is commercially available its two different isomers with equal fluorescence sensitivity, differing meta- vs. para-isothiocyanate position. It was found this study that the stability of depends on polarity solvents and pyridine (stabiliser) presence. The lowest has water solvent. In acidic solution, their quinoid (acid) ...

A novel simultaneous phase-trafficking approach using spatially separated solid-supported reagents for rapid separation of neutral, basic, and acidic compounds from organic plant extracts with minimum labor is reported. Acidic and basic ion-exchange resins were physically separated into individual sacks ("tea bags") for trapping basic and acidic compounds, respectively, leaving behind in soluti...

Abstract A critical overview of the separation three relevant triterpenic acids, namely betulinic, oleanolic, and ursolic by liquid supercritical fluid chromatography is presented in this review. These acids are commonly found different biomass residues have raised great research attention recent years due to their broad valuable therapeutic properties. Accordingly, fundamental aspects such as ...

Flavanone was synthesized through the Claisen–Schmidt condensation between benzaldehyde and acetophenone and subsequent intramolecular Michael addition over aminopropyl-functionalized SBA-15 materials. The catalysts with well-ordered hexagonally arranged mesopores were synthesized by one-pot co-condensation of tetraethoxysilane and aminopropyltriethoxysilane using amphiphilic block copolymer as...