a simple, mild and efficient method for the regioselective nitration of various aromatic compounds usingpoly(4-vinylpyridinium nitrate) (p4vpyn) in the presence of melamine trisulfonic acid (mtsa), is reported.this method provides several advantages such as good selectiveity between ortho and para positions ofaromatic compounds, clean procedure, simple work-up, short reaction times, solvent-fre...

This paper describes a fast method for the sensitive and selective determination of melamine in a wide range of food matrices, including several milk-based products. The method involves an extraction with aqueous 1% trichloroacetic acid before the injection of the 10-fold diluted extract into the liquid chromatography-electrospray tandem mass spectrometry (LC-ESI-MS/MS) system, using labelled m...

Two new tris-melamine derivatives, triazine-thio-M(3) (5) (C(3)N(3)-2,4,6-[SCH(2)C(6)H(4)-3-N(CH(2)C(6)H(4)-4-C(CH(3))(3))COC(6)N(3)-2-NHC(3)N(3)(NH(2))(NHCH(2)CH(2)C(CH(3))(3))-5-Br](3)) and benzene-thio-M(3) (6) (C(6)H(3)-1,3,5-[SCH(2)C(6)H(4)-3-N(CH(2)C(6)H(4)-4-C(CH(3))(3))COC(6)H(3)-2-NHC(3)N(3)(NH(2))(NHCH(2)CH(2)C(CH(3))(3))-5-Br](3)), were synthesized by reactions of 2,4,6-trithiocyanur...

The increasingly common application of the near-infrared (NIR) hyperspectral imaging technique to the analysis of food powders has led to the need for optical characterization of samples. This study was aimed at exploring the feasibility of quantifying penetration depth of NIR hyperspectral imaging light for milk powder. Hyperspectral NIR reflectance images were collected for eight different mi...

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Molecular self-assembly films are expected to tailor the surface process by the periodic nanostructures and add-on functional groups. In this work, a molecular network of melamine with featured pores of subnanometer size is prepared on the Au(111) surface, and is found to be able to trap the gold adatoms and concomitant single vacancies generated under the impingement of CO molecules at room te...

Pt3Fe(111), Pt3Fe(775) = 7(111)–(111), and Pt3Fe(544) 9(111)–(100) electrodes show the highest activity in low-index planes, n(111)–(111), n(111)–(100) series of Pt3Fe, respectively. The surfaces these were modified with hydrophobic species such as THA+, melamine, ionic liquid ([MTBD][beti]), effects on oxygen reduction reaction (ORR) studied. All improved ORR all examined. Pt3Fe(111) 0.1 M HCl...

Melamine is a nitrogen-rich industrial chemical which is occasionally used to increase the apparent protein content of different products destined for human and animal consumption. In this work, a liquid chromatographic procedure that uses micellar mobile phases of sodium dodecyl sulfate (SDS) buffered at pH 3, a C18 column and UV detection is reported for the determination of melamine in diete...

This article describes reactions of the trivalent melamine derivatives C6H3-1,3,5-[CONHC6H4-3-N(CH2C6H44-C(CHi)3)COC6H3-2-(NHCrN3(NH2XNHCH2CH2C(CH3)3))-5-Brl, (hubM3) and (CH3),COC(O)NHCICH2O(CHz)rSCH2C(O)NHC6H4-2-NHC3N3(NH2)(NH(CH2)2C(CH3)r)1, (trisMr) with the bivalent isocyanurate derivatives CuHzl ,5.[CH(CH)2|z-2,4.[cH,ff i(o)]z(benzCA,)andc4o-2'5-[cH(cH3)2]?-3'4-[cH,ff i6[ NHC(O)12 (furanC...