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Articles by M.M. Conceicao
Total Records ( 3 ) for M.M. Conceicao
  M.C.D. Silva , M.M. Conceicao , J.C.O. Santos and A.G. Souza
  The thermal decomposition kinetics of solid Zinc(II) bis(dialkyldithiocarbamate) complexes, Zn (S2CNR2)2, where R= i-C3H7, n-C4H9, i-C4H9 and n-C5H11, were studied by using isothermal thermogravimetric heating technique. Results show that the thermal decomposition of these complexes occurs in a homogeneous liquid phase, after melting, according to a unidimensional phase-boundary reactions model, R1. The thermal stability was found to be in the following order: Zn(S2CNBui2)2< Zn(S2CNPri2)2< Zn(S2CNBun2)2< Zn(S2CNPen2)2.
  M.M. Conceicao , V.J. Fernandes , T.G. Nascimento , C.F.S. Aragao , R.O. Macedo and A.G. Souza
  The calorimetric curves of sweetener, standards and aspartame/lactose mixtures indicated displacement of transition temperatures in sweetener for smaller temperatures, decreasing the thermal stability. The images in the photovisual system confirmed the displacement of transition temperatures in sweetener and binary mixtures. The brown coloration in smaller temperatures has suggested interaction of aspartame with lactose similar the Maillard’s reaction. These techniques allow a rapid evaluation of possible interactions between raw material and excipients.
  M.M. Conceicao , J.C.O. Santos , P.A. Filgueiras , R.O. Macedo , V.J. Fernandes and A.G. Souza
  The thermogravimetric profile of sweetener, Aspartame (APM) and 5-Benzyl-3,6-dioxo-2-piperazineacetic acid (5BZ) standards presented six, four and one events of thermal decomposition, respectively. In sweetener and APM have occurred dehydration and volatilization of methanol, which was confirmed stoichiometrically. The Py-GC-MS results of APM and sweetener indicated volatilization of methanol and Phenylalanine Methyl Ester (PME), which were identified as products of thermal decomposition. The product PME was common at APM and 5BZ standards suggesting the conversion of APM to 5BZ. In sweetener occurred formation of PME by degradation process similar to APM.
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