The nitrogen K-edge spectra of aqueous proline and diglycine solutions have been measured by total electron yield near-edge X-ray absorption fine structure (NEXAFS) spectroscopy at neutral and high pH. All observed spectral features have been assigned by comparison to the recently reported spectrum of aqueous glycine and calculated spectra of isolated amino acids and hydrated amino acid cluster...

The structural specificity of amine oxidation by lysyl oxidase was investigated using kinetic and NMR spectroscopic analyses. Substrate efficiency increased with increasing molecular distance from the alpha-carbon of the aromatic moiety substituted on the aliphatic chains of a series of primary amines. The p-hydroxyl substituent of p-hydroxybenzylamine significantly increased kcat over that of ...

In this study, plantwide control of an absorption/stripping CO2 capture process using mono-ethanol-amine was investigated using dynamic simulation. In this system, CO2 removal ratio is influenced by operating variables such as lean solvent rate and lean solvent loading, which is in-turn determined by reboiler duty in the stripper. Moreover, we found that the long term stability of the system ca...

Paper spray mass spectrometry is a method for the direct analysis of biofluid samples in which extraction of analytes from dried biofluid spots and electrospray ionization occur from the paper on which the dried sample is stored. We examined matrix effects in the analysis of small molecule drugs from urine, plasma, and whole blood. The general method was to spike stable isotope labeled analogs ...

We report the kinetic study of the substitution reaction of a cationic platinum(II) complex [Pt(dpma)Cl](+) (dpma identical with di(2-picolyl)amine) with thioacetate in room temperature ionic liquids {[C(4)C(1)im][NTf(2)], [C(4)C(1)py][NTf(2)], [C(4)C(1)py][OTf] and [(C(3)O)C(1)im][NTf(2)]} and molecular solvents (water, methanol and DMSO). The reaction was studied as a function of the nucleoph...

There are some studies on the synthesis of polyurea microcapsules. However, there is hardly a case where both green solvents and non-toxic isocyanates used, especially in microfluidics. In this work, an environmentally friendly chemical system interfacial polymerization (isocyanate: HDB-LV; solvent: octyl salicylate or dibutyl adipate) tested for first time to produce The size microcapsules cal...

Abstract As a result of massive bee deaths in recent years, beekeeping is raising concerns about the presence pesticides propolis which considered as safe product. The paper focused on analysis and propolis-based products using various chromatographic techniques mass spectrometry detection predominantly. An important part work an overview concerning methods sample preparation, extraction, purif...

Membrane gas–liquid contactors have been developed to reduce the capital cost and energy consumption of conventional CO2 absorption stripping columns. As a hybrid technology membrane separation amine absorption, these units can improve gas process by generating 400–1500% greater mass transfer area per unit volume leading smaller equipment sizes. Regeneration occur within contactor below boiling...

Using solid phase extraction (SPE) combined with HPLCfluorescence/photodiode array (PDA) detection several low molecular-weight alkylamines (including ethylamine and propylamine) have been detected in the gas-phase, released during the oxidative/thermal degradation of monoethanolamine (MEA), an amine-based postcombustion CO2 capture solvent. In this study, a 30 wt% aqueous MEA solution was degr...

A biomass-based catalyst with amine groups (-NH₂), viz., amine-functionalized sugarcane bagasse (SCB-NH₂), was prepared through the amination of sugarcane bagasse (SCB) in a two-step process. The physicochemical properties of the catalyst were characterized through FT-IR, elemental analysis, XRD, TG, and SEM-EDX techniques, which confirmed the -NH₂ group was grafted onto SCB successfully. The c...