Albonoursin [cyclo(ΔPhe-ΔLeu)], an antibacterial peptide produced by Streptomyces noursei, is one of the simplest representatives of the large diketopiperazine (DKP) family. Formation of α,β unsaturations was previously shown to occur on cyclo(L-Phe-L-Leu), catalyzed by the cyclic dipeptide ...

The photochemical transformation of the chlorophenoxy herbicide MCPA was investigated under a variety of reaction conditions using distilled water, Thames river water and solutions of naturally occurring photosensitizers. Under low intensity UV (300–450 nm), MCPA was transformed in river water ...

Hydrotalcite-like compounds [Mg3Al(OH)8]Cl·4H2O; [Mg3Fe(OH)8]Cl·4H2O; [Mg3Al0.5Fe0.5(OH)8]Cl·4H2O (LDHs) and calcined product of [Mg3Al(OH)8]Cl·4H2O, Mg3AlO4.5 (HT500), were studied as potential adsorbents of the herbicide MCPA [(4-chloro-2-methylphenoxy)acetic acid] as a function of pH, con...

Herbicide leaching through soil into groundwater greatly depends upon sorption–desorption and degradation phenomena. Batch adsorption, desorption and degradation experiments were performed with acidic herbicide MCPA and three soil types collected from their respective soil horizons. MCPA was fo...

The study describes the preparation of graphene oxide based silica coated magnetic nanoparticles (Fe3O4@SiO2@GO) functionalized with 2-phenylethylamine (PEA) as an adsorbent for selected organophosphorus pesticides (OPPs) namely chlorpyrifos, parathion, and malathion from aqueous solution. The s...

Sonochemical degradation of MCPA ((4-chloro-2-methylphenoxy) acetic acid) in dilute aqueous solutions was studied using ultrasound with a frequency of 500 kHz. The effect of gas atmosphere on MCPA degradation was investigated in nitrogen (N2), air (O2/N2), oxygen (O2), argon (Ar) and Ar/O2 (60/4...

The photocatalytic decomposition of the herbicide (4-chloro-2-methylphenoxy)acetic acid (MCPA), C9H9ClO3, in aqueous suspensions containing TiO2 was investigated by following the formation of intermediates via recording proton NMR spectra. One of theoretically possible intermediates, 4-chloro-2-...

The work describes a study of the oxidation power of nitrogen-doped titanium dioxide (TiO2) suspensions for photocatalytic degradation of the herbicides RS-2-(4-chloro-o-tolyloxy)propionic acid (mecoprop) and (4-chloro-2-methylphenoxy)acetic acid (MCPA) using various light sources. The nitrogen-...

The photocatalytic TiO2-assisted decomposition of 2-(4-methylphenoxy)ethanol (MPET) in aqueous solution has been studied for the first time. The intermediate compounds of MPET photodegradation have been also determined. A toxic p-cresol is formed in significant quantities during the photocatalyt...

Silica-bonded 1,4-diaza-bicyclo[2.2.2]octane-acetic acid bromide (SBDBAAB) as a novel nanostructured catalyst was prepared and fully characterized by several techniques including fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), differe...

The musk fragrances galaxolide (HHCB) and tonalide (AHTN) are compounds of emerging concern that have been found in various environmental compartments. The present study addressed the ability of HHCB and AHTN to elicit the avoidance response in the estuarine shrimp Palaemon varians and to predic...

The environmental risk of galaxolide (HHCB) spurs the need to develop efficient and economical removal technology. Although sorption is one of the best removal approaches, studies on sorption of HHCB by biochar were limited. With the purpose of combining the advantages of ball-milling and sorpti...

Generally, dietary intake assessment and risk characterization are evaluated using contaminant concentration in raw fish while it is usually ingested cooked, which can cause an overestimation because one of the essential issues for risk-benefit analysis is to determine the maximum amount of a co...

The vapor pressures and vaporization enthalpies of dibenzofuran, (−) Ambroxide™ and Galaxolide™ are evaluated by correlation gas chromatography. (−) Ambroxide™ and Galaxolide™ are important commercial products, the latter of which has been the subject of some controversy regarding its impact on ...

The elimination of doxylamine and metabolites was determined after iv administration of [14C]doxylamine succinate at 0.7 and 13.3 mg/kg to the adult female rhesus monkey. Although the total recovery of radioactivity was the same for the low-and high-dose studies (90.2%), the rate of plasma elimi...

The time-of-flight secondary ion mass spectrometry (TOF-SIMS) has emerged as a powerful tool for the unswerving detection of biomolecules, in particular, proteins and peptides. To date, there is very little information available on the direct determination of trimethyl/triethyl amines using TOF-...

Ammonia triethyl amide (ATEA) was synthesized by a new facile one-step method using chloroacetamide and ammonia as raw materials, and its structure was characterized by FTIR and 1HNMR. TGA showed that the decomposition temperature of compounds was about 110 °C, which had good thermal stability....

A silica supported ionic liquid was synthesized and characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, X-ray diffraction, N2 adsorption-desorption, and thermogravimetric analysis. All these techniques, especially SEM results indicated the presence of we...

Electropolishing of Steel in phosphoric acid is considered as corrosion rate of Steel and due to the economic importance of Steel, there are several researches deals with acceleration and inhibition of this process. This paper threw some light on the effect of adding some organic amines on the e...

Structural and vibrational properties of 4-hydroxy-3-(3-methyl-2-butenyl)acetophenone, isolated from Senecio nutans Sch. Bip. (Asteraceae) were studied by infrared and Raman spectroscopies in solid phase. The Density Functional Theory (DFT) method together with Pople’s basis set show seven stab...