Search Results

You are looking at 1 - 10 of 101 items for :

  • "nicotinamide" x
  • Refine by Access: All Content x
Clear All
Acta Chromatographica
Authors: Andreea Silvia Neamţu, Andrei Biţă, Ion Romulus Scorei, Gabriela Rău, Ludovic Everard Bejenaru, Cornelia Bejenaru, Otilia-Constantina Rogoveanu, Carmen Nicoleta Oancea, Antonia Radu, Cătălina Gabriela Pisoschi, Johny Neamţu, and George Dan Mogoşanu

Introduction The main building blocks of nicotinamide riboside (NAR), a pyridine-nucleoside form of vitamin B 3 , are nicotinamide (NA) and ribose. NAR can be found in milk, yeast, and beer but also in bacteria and mammals. NAR

Open access

Ananda PK, Kumarappan CT, Christudas S, Kalaichelvan VK: Effect of Biophytum sensitivum on streptozotocin and nicotinamide-induced diabetic rats. Asian Pac. J. Trop. Biomed. 2, 31–35 (2012) Kalaichelvan V

Restricted access

Abstract  

The complex Mn(Nica)2Cl2 (Nica=nicotinamide) was prepared, and its decomposition was studied by means of TG and DSC. The IR spectra of the products of thermal decomposition were examined at every stage. Kinetic analysis of the first stage of thermal decomposition was performed via the TG-DTG curves, and the kinetic parameters were obtained from analysis of the TG-DTG curves with integral and differential methods. The most probable kinetic function was suggested from a comparison of the kinetic parameters. Mathematical expressions were derived for the kinetic compensation effect.

Restricted access

Abstract  

New zinc complex compounds of general formula ZnL2,X2 {X=CI, Br; L=phenazone(phen), nicotinamide(nam)} were synthesized. The new compounds were characterized by elemental analysis, IR spectroscopy and DTA, TG/DTG methods. Thermal properties of the new compounds were investigated. It was found that nicotinamide, phenazone and ZnCl2 or ZnBr2 are released during the thermal decomposition of the compounds. Mass spectroscopy has been used for the determination of the thermal decomposition intermediate products.

Restricted access

Abstract  

The zinc(II) complex with nicotinamide (ncam) was prepared and investigated by single-crystal X-ray diffraction, infrared spectrum (FTIR), conductivity and thermal analysis techniques. The formula of complex is [Zn(ncam)2(H2O)4](NO3)2·2H2O. The nicotinamide molecule has three following donor sites: pyridine ring nitrogen, aminonitrogen and carbonyl group oxygen. In this monomeric complex, the Zn(II) ion is six-coordinated by two pyridine ring N atoms and four water O atoms in a slightly distorted octahedral arrangement. In the crystal structure, intermolecular O-H…O and N-H…O hydrogen bonds link the molecules to form a supramolecular structure. The complex is stable up to 323 and above 360 K it dehydrates in one step losing six water molecules. The dehydration proceeds in the range of 360–438 K, and its enthalpy value is equal to 62.6±1.5 kJ mol−1.

Restricted access

Abstract  

The mixed-ligand m-hydroxybenzoate complexes of Co(II), Ni(II), Cu(II) and Zn(II) with nicotinamide were synthesized and characterized. The chemical, FT IR and UV-vis spectrophotometric, thermal and mass spectral analyses, magnetic susceptibility measurements revealed that the compounds contain two water molecules, two m-hydroxybenzoate (m-hba) and two nicotinamide (na) ligands per formula unit. m-Hydroxybenzoate and nicotinamide ligands bind to the metal atoms monodentately through their acidic oxygen and pyridinic nitrogen atoms, respectively. The thermal decomposition pathways and the stability of the complexes are interpreted in the terms of the structural data.

Restricted access

Abstract  

The stoichiometry of thermal decomposition was studied for the following Mg(II) nicotinamide (NA) complexes: Mg(Ac)2(NA)52H2O (I), Mg(CIAc)2(NA)66H2O (II), Mg(Cl2Ac)2(NA)65H2O (III) and Mg(Cl3Ac)2(NA)62H2O (IV), where Ac=CH3COO, ClAc=ClCH2COO, Cl2Ac=Cl2CHCOO and Cl3Ac=Cl3CCOO. Heating the compounds results first in the release of water molecules. The NA molecules are released in one step (complexes II and III) or in two steps (complexes I and IV). The compositions of the complexes, the solid-state intermediates and the products of thermolysis were identified by means of elemental analysis and complexometric titration. The results reveal that MgO is left as residue at the end of thermal degradation of compounds I–IV, NA is coordinated to Mg(II) through the nitrogen atom of the heterocyclic ring. The IR data indicate unidentate coordination of the carboxylate ions to the Mg(II) in complexes I–IV.

Restricted access

– 161 ( 2005 ) 19. Masiello P , Broca C , Gross R , Roye M , Manteghetti M , Hillaire-Buys D , Novelli M , Ribes G : Experimental NIDDM: development of a new model in adult rats administered streptozotocin and nicotinamide

Restricted access

drugs [ 23 – 27 ]. Structural reports on metal (Zn 2+ ) nicotinamide complexes exist in [ 28 – 31 ]. Nicotinamide is known as a component of the vitamin B complex as well as a component of the coenzyme, nicotinamide adenine dinucleotide (NAD). It

Restricted access