Dominik Schaniel, Nicholas V. Mockus, Theo Woike, Axel Klein, Denis Sheptyakov, Teodora Todorova, B. Delley,
Nitro-nitrito photoisomerisation is investigated in solid samples and solutions of trans-[Ru(py)(4)(NO(2))(2)]. Using ... switched to the O-bound Ru-ONO configuration (nitrito-N to nitrito-O isomerisation) at temperatures below T = 250 K ... solution nearly 100% can be converted to the nitrito-O configuration. Upon heating above T = 250 K the Ru-NO(2) configuration is restored. The nitrito-O Ru-ONO configuration can be partially transferred back to the nitrito-N configuration by irradiation with light in the ...
Tópico(s): Porphyrin and Phthalocyanine Chemistry
2010 - Royal Society of Chemistry | Physical Chemistry Chemical Physics
Mona El-Ghamrawy, Wagdi Maurice Hanna, Amina Abdel-Salam, Marwa M. El-Sonbaty, Eman R. Youness, Ahmed Adel,
... capacidade antioxidante total (CAT), paraoxonase (PON), vitamina E, nitrito e malondialdeído (MDA) em 40 crianças estáveis com ... séricos médios da CAT, PON, vitamina E e nitrito foram significativamente menores, ao passo que o nível ... diferenças significativas nos níveis médios de CAT, PON, nitrito, vitamina E e MDA em pacientes com AF ... hidroxiureia. Encontramos uma correlação negativa significativa entre o nitrito sérico e a ocorrência de crises vaso-oclusivas ... CVO. A área sob a curva (ASC) do nitrito sérico na previsão da ocorrência de CVO foi ...
Tópico(s): Paraoxonase enzyme and polymorphisms
2014 - Elsevier BV | Jornal de Pediatria
S.K. Brayshaw, Timothy L. Easun, Michael W. George, A.M.E. Griffin, Andrew L. Johnson, Paul R. Raithby, T.L. Savarese, Stefanie Schiffers, J.E. Warren, Mark R. Warren, Simon J. Teat,
... low temperature, metastable structures of the nickel(II) nitrito complexes [Ni(aep)2(η1-ONO)2] 1# ... and where the #O denotes the oxygen-bound nitrito metastable molecule). These linkage isomers of the equivalent ... all three complexes 1–3 exhibit the endo-nitrito linkage isomer upon irradiation, however, for 3# (a ... of both 3 and 3#O) an exo-nitrito isomer is also observed. Under conditions of 90– ... with blue light, the conversion percentages to the nitrito isomers, 1#O, 2#O and 3#O ... respectively. At temperatures below 110 K all three nitrito isomers were stable for over four hours but ...
Tópico(s): Metal complexes synthesis and properties
2011 - Royal Society of Chemistry | Dalton Transactions
Produção Nacional
Revisado por pares
Andréa de Fátima Sato, Arthur Estivalet Svidzinski, Márcia Edilaine Lopes Consolaro, Cinthia Gandolfi Bôer,
... gram-positivas, uma vez que o teste de nitrito não revela a presença de patógenos gram-positivos ... adultos sintomáticos, relacionando-as com o resultado de nitrito urinário, para traçar o perfil epidemiológico desses pacientes. ... proporção de pacientes com hipertensão (31,3% com nitrito positivo versus 4,5% com nitrito negativo, p < 0,05). Os pacientes com resultado de nitrito positivo relataram febre em proporção maior que os com nitrito negativo (75% versus 43,2%, respectivamente; p < 0, ... clínicos e sintomas, juntamente com o resultado de nitrito urinário na tira reagente, poderia auxiliar o médico ...
Tópico(s): Kidney Stones and Urolithiasis Treatments
2005 - Sociedade Brasileira de Patologia Clínica | Jornal Brasileiro de Patologia e Medicina Laboratorial
Produção Nacional
Revisado por pares
Monalisa Pereira Dutra, Eduardo Mendes Ramos, Alcinéia de Lemos Souza Ramos, Paulo Rogério Fontes, Giselle Pereira Cardoso, Alexandre Soares Leal,
... 0, 7,5 e 15kGy) e níveis de nitrito (0, 75 e 150ppm) sobre o índice de TBARS, cor objetiva, concentração residual de nitrito e de pigmentos heme totais (PHT) e nitrosos ( ... e reduziu (P<0,05) os níveis de nitrito residual no primeiro mês de estocagem, mas pouco ... A cor dos produtos formulados com 150ppm de nitrito não foi afetada (P>0,05) pela irradiação. ... aplicadas em mortadelas com mais de 75ppm de nitrito, sem que haja grandes alterações na cor e ...
Tópico(s): Nuclear Physics and Applications
2011 - UNIVERSIDADE FEDERAL DE SANTA MARIA | Ciência Rural
Produção Nacional
Revisado por pares
Marco Antônio Trindade, Tatiana Pacheco Nunes, Carmen J. Contreras‐Castillo, Pedro Eduardo de Felício,
... 18 °C, foi realizada prévia mistura de conservante (nitrito de sódio) e antioxidante (eritorbato de sódio) em ... sem aditivos); 2) adição de 150 ppm de nitrito; e 3) adição de 150 ppm de nitrito e 500 ppm de eritorbato. Os resultados encontrados demonstraram que a adição de nitrito isoladamente não impediu a oxidação lipídica, avaliada através ... em colorímetro. Por outro lado, a adição de nitrito juntamente com eritorbato foi efetiva na redução dos ... grau, na CMS de poedeiras. A adição de nitrito e eritorbato na CMS também melhorou a preservação ...
Tópico(s): Radiation Effects and Dosimetry
2008 - Sociedade Brasileira de Ciência e Tecnologia de Alimentos | Food Science and Technology
Fidel Toldrá, M‐Concepción Aristoy, Mónica Flores,
Relevancia de nitrato y nitrito en el jamón curado y sus efectos en el desarrollo del aroma.Las sales sódica y potásica del nitrito (E249 y E250) y del nitrato (E251 y ... punto esencial en el uso de nitrato y nitrito como conservantes consiste en encontrar un balance entre ... tan bajo como sea posible.Los nitratos y nitritos están autorizados como aditivos en el jamón curado ... El efecto del nitrato y su reducción a nitrito para controlar la oxidación de los lípidos durante ... y problemas del uso de los nitratos y nitritos en el jamón curado así como sus efectos ...
Tópico(s): Muscle metabolism and nutrition
2009 - Spanish National Research Council | Grasas y Aceites
Tigran S. Kurtikyan, Astghik A. Hovhannisyan, Manya E. Hakobyan, J. C. Patterson, Alexei V. Iretskii, Peter C. Ford,
... TTP) leads to formation of the 5-coordinate nitrito complexes Fe(Por)(eta1-ONO) (1), which are ... low temperature involves ligand addition to give the nitrito-nitrosyl complexes Fe(Por)(eta1-ONO)(NO) (3); ... doublet nitro species and the quartet and sextet nitrito complexes are all relatively close in energy. The ... nitrosyl complex Fe(Por)(NO) and the ferric nitrito complex Fe(Por)(eta1-ONO) indicating the competitive ... of NO from 4 is accompanied with nitro --> nitrito isomerization consistent with 1 being the more stable ...
Tópico(s): Analytical Chemistry and Sensors
2007 - American Chemical Society | Journal of the American Chemical Society
Milyan Jorge de Oliveira, Wilma Maria Coelho Araújo, Luiz Antônio Borgo,
... trabalho foi quantificar o teor de nitrato e nitrito de sódio em amostras de lingüiças frescal de ... 2 e 221 ppm para a fração de nitrito; para as amostras de lingüiça frescal de pernil, ... 6 a 162,2 ppm para a de nitrito. Entre os lotes de lingüiça de frango, a ... entre 1,2 e 221ppm para a de nitrito; as amostras de lingüiça frescal de pernil apresentaram ... de 0,6 a 162,2 ppm para nitrito. 7,1% das amostras estavam em desacordo com ...
Tópico(s): Meat and Animal Product Quality
2005 - Sociedade Brasileira de Ciência e Tecnologia de Alimentos | Food Science and Technology
Tigran S. Kurtikyan, Vardan Hayrapetyan, M. M. Mehrabyan, Peter C. Ford,
... with initial formation of the five coordinate O-nitrito complex MnIII(TPP)(η1-ONO) (I) as demonstrated ... leads to formation of the 6-coordinate O-nitrito MnIII(TPP)(L)(η1-ONO) and monodentate nitrato ... complexes, respectively. Formation of the 6-coordinate O-nitrito complex is accompanied by the shifts of the ... Mn(TPP)(NH3)2]+ plus ionic nitrite. The nitrito complexes are relatively unstable, but several of the ...
Tópico(s): Analytical Chemistry and Sensors
2014 - American Chemical Society | Inorganic Chemistry
Alexandra Lambrou, Eftychia Pinakoulaki,
... information from resonance Raman spectroscopy on the myoglobin nitrito heme Fe-O-N=O/2-nitrovinyl species ... Our results indicate that the formation of the nitrito heme Fe-O-N=O/2-nitrovinyl species is pH-dependent. The conditions under which the nitrito heme Fe-O-N=O/2-nitrovinyl species ... at low pH results in the protonation of nitrito heme Fe-O-N=O by His64 Nε- ...
Tópico(s): Heme Oxygenase-1 and Carbon Monoxide
2014 - Royal Society of Chemistry | Physical Chemistry Chemical Physics
... X2 (nitro isomer) and [Co(NH3)5ONO]X2 (nitrito isomer) complexes (X = Cl−, Br−, I−, PF6−) was ... an equilibrium stable state in which nitro and nitrito isomers are major and minor components, respectively. Change ... nitro isomer is always more stable than the nitrito one. The equilibrium constant (nitro to nitrito molar ratio) increases in the series Cl− ≈ Br− ...
Tópico(s): Free Radicals and Antioxidants
2013 - Elsevier BV | Thermochimica Acta
Tigran S. Kurtikyan, Astghik A. Hovhannisyan, Alexei V. Iretskii, Peter C. Ford,
... ether tetrahydrofuran gives a mixture of the O-nitrito and N-nitrito isomers Fe(Por)(THF)(η1-ONO) and Fe( ... with nitrogen donor Lewis bases where the N-nitrito isomers were clearly the more stable of the ... adduct formation is reversible; the five-coordinate O-nitrito complexes Fe(Por)(η1-ONO) were largely restored ...
Tópico(s): Hemoglobin structure and function
2009 - CSIRO Publishing | Australian Journal of Chemistry
Produção Nacional
Revisado por pares
Artur Bibiano de Melo Filho, Telma Maria Barreto Biscontini, Sâmara Alvachian Cardoso Andrade,
Os sais de nitrato e nitrito em excesso prejudicam a saúde. Com o objetivo de avaliar a qualidade de salsichas comercializadas em Recife-PE, os níveis de nitrito residual e nitrato foram determinados em 54 amostras ... grupo (C) 67% das amostras apresentavam-se com nitrito residual >150mg/kg (18% do total); e os ... permitiram indicar que os níveis de nitrato e nitrito em salsichas representam um risco potencial à saúde ...
Tópico(s): Dye analysis and toxicity
2004 - Sociedade Brasileira de Ciência e Tecnologia de Alimentos | Food Science and Technology
Albert Escuer, Ramón Vicente, Xavier Soláns,
Three new one-dimensional µ-nitrito nickel(II) complexes of formula [{NiL 1 (µ-NO 2 )} n ] [ClO 4 ] n 1, [{NiL 2 (µ-NO 2 )} n ] [ ... placed in an octahedral environment with the µ-nitrito groups in trans position co-ordinated by the ... of its oxygen atoms. Inversion centres on the nitrito bridges but not on the nickel atoms allow ...
Tópico(s): Metal complexes synthesis and properties
1997 - Royal Society of Chemistry | Journal of the Chemical Society. Dalton transactions
Ibuki Nakamura, Ryo Sumitani, Tomoyuki Mochida,
Nitro–nitrito isomerization is a well-known photoreaction exhibited by metal complexes in the solid state. We previously reported ... in the salts of a cationic platinum(II) nitrito complex [Pt(L)(NO2)]+ (L = N1-(2-(dimethylamino) ... is correlated to the reaction cavity surrounding the nitrito ligand. In this study, to further elucidate the ...
Tópico(s): Polyoxometalates: Synthesis and Applications
2021 - American Chemical Society | Crystal Growth & Design
... crystal X-ray diffraction data revealed the endo-nitrito (κ1–ONO) coordination in complexes 3 and 4. ... inert atmosphere conditions, were resulted the corresponding endo-nitrito (κ1–ONO) complexes. Density functional theory (DFT) was ... of the axial bromo with the electron withdrawing nitrito ligand. The analysis of the molecular orbital (MO) ...
Tópico(s): Synthesis and Biological Evaluation
2016 - Elsevier BV | Inorganica Chimica Acta
Mark R. Warren, Timothy L. Easun, S.K. Brayshaw, Robert J. Deeth, Michael W. George, Andrew L. Johnson, Stefanie Schiffers, Simon J. Teat, Anna J. Warren, J.E. Warren, Chick C. Wilson, Christopher H. Woodall, Paul R. Raithby,
... reversible solid-state interconversion between the nitro and nitrito structural isomers have also been investigated, providing insight ... NO2 nitro isomer and the η(1)-ONO nitrito form when single-crystals are irradiated with 400 ... studies for these complexes established that the metastable nitrito isomer reverted to the ground-state nitro isomer ... K. The level of conversion to the metastable nitrito isomers is further reduced when the nickel centre ...
Tópico(s): Free Radicals and Antioxidants
2014 - Wiley | Chemistry - A European Journal
S. Naiya, Hui‐Sheng Wang, Michael G. B. Drew, You Song, Ashutosh Ghosh,
... but in these two compounds a cis-(μ-nitrito-1κO:2κN) bridge is present in addition to ... in which double phenoxo as well as μ-nitrito-1κO:2κN bridged trinuclear units are linked through a very rare μ3-nitrito-1κO:2κN:3κO′ bridge. Analysis of variable-temperature ...
Tópico(s): Metal-Organic Frameworks: Synthesis and Applications
2011 - Royal Society of Chemistry | Dalton Transactions
Eva I. Montero, Junyong Zhang, Joseph J. Moniodis, Susan J. Berners‐Price, Nicholas P. Farrell,
... glutathione (GSH), methionine (Met) and acetylmethione (AcMet) of nitrito derivatives of di- and trinuclear platinum antitumor compounds: [{ ... 2)(NO(2))(SG)] (4) shows that the nitrito group remains coordinated while the linker amine is ... of GS(-), and then trans labilization of the nitrito group occurs leading to 5 and 6. Reaction ... does not lead to trans labilization of the nitrito group.
Tópico(s): Magnetism in coordination complexes
2010 - Wiley | Chemistry - A European Journal
Fu‐Te Tsai, Ting‐Shen Kuo, Wen‐Feng Liaw,
... reversible transformation occurs between the six-coordinate chelating nitrito {Fe(NO)2}9 DNIC 1 and the four-coordinate monodentate nitrito {Fe(NO)2}9 DNIC [(1-MeIm)(ONO)Fe(NO)2] (2-MeIm). The chelating nitrito of DNIC 1, triggered by PPh3, undergoes O- ...
Tópico(s): Nitric Oxide and Endothelin Effects
2009 - American Chemical Society | Journal of the American Chemical Society
Produção Nacional
Revisado por pares
Jamily Bezerra Bruno, I.B. Lima-Verde, F.S. Martins, M.H.T. Matos, C.A.P. Lopes, J.E. Maia-Jr., Sônia Nair Báo, Hélio Vitoriano Nobre Júnior, Flávio Damasceno Maia, Cláudia Pessoa, Milton Ozório Moraes, J.R.V. Silva, J.R. Figueiredo, Ana Paula Ribeiro Rodrigues,
... verificou-se a relação entre as concentrações de nitrito presentes no meio de cultivo e a viabilidade ... entre a viabilidade folicular e a produção de nitrito. A suplementação com soro não melhorou a viabilidade de FOPA e a concentração de nitrito no meio de cultivo funcionou como um indicador ...
Tópico(s): Reproductive Biology and Fertility
2008 - UNIVERSIDADE FEDERAL DE MINAS GERAIS | Arquivo Brasileiro de Medicina Veterinária e Zootecnia
Jun Yi, Martin K. Safo, George B. Richter‐Addo,
... resolution. The nitrite ligand adopts the uncommon O-nitrito binding mode. In addition, the nitrito conformations in the α and β subunits are ... in orienting the nitrite ligand in the O-nitrito binding mode.
Tópico(s): Electron Spin Resonance Studies
2008 - American Chemical Society | Biochemistry
Tigran S. Kurtikyan, Astghik A. Hovhannisyan, Gurgen M. Gulyan, Peter C. Ford,
... gases with sublimed layers containing the 5-coordinate nitrito iron(III)−porphyrinato complexes Fe(Por)(η1-ONO) ( ... ONO) at 140 K initially led to the nitrito species Fe(Por)(NH3)(η1-ONO), and this ... to room temperature under intense pumping, the initial nitrito complexes Fe(Por)(η1-ONO) were restored. Assignments ...
Tópico(s): Electrochemical Analysis and Applications
2007 - American Chemical Society | Inorganic Chemistry
Produção Nacional
Revisado por pares
Nelcindo Nascimento Terra, Alexandre José Cichoski, Renato João Sossela de Freitas,
... durante o armazenamento, foram monitorados os valores de nitrito e TBARS com o objetivo de identificar onde o nitrito atuaria como conservante e antioxidante e onde o ... do consumidor. Observou-se que a concentração dos nitritos até o décimo dia de permanência da paleta ...
Tópico(s): Tea Polyphenols and Effects
2006 - UNIVERSIDADE FEDERAL DE SANTA MARIA | Ciência Rural
Irina Novozhilova, Philip Coppens, Jonghyuk Lee, George B. Richter‐Addo, Kimberly A. Bagley,
... the IR spectrum associated with both nitro-to-nitrito and nitrosyl-to-isonitrosyl linkage isomerism. Only the nitro-to-nitrito linkage isomer is obtained at 200 K, indicating ... isonitrosyl linkage isomer is less stable than the nitrito linkage isomer. DFT calculations reveal two ground-state ... FeNO}6 compound. Three conformations of the nitrosyl−nitrito isomer (porphine)Fe(NO)(ONO) (MSa∥, MSa⊥, and ...
Tópico(s): Nitric Oxide and Endothelin Effects
2006 - American Chemical Society | Journal of the American Chemical Society
Franz A. Mautner, Ramón Vicente, Salah S. Massoud,
... the Medpt, an oxygen atom O(1) from nitrito group and oxygen atom O(3) of a ... the second oxygen atom O(2) of the nitrito group. In the bridged thiocyanato complex 3, the ... cm−1. The IR stretching frequencies of the nitrito, ν(NO2-) and thiocyanato, ν(NCS−) groups in ...
Tópico(s): Crystal structures of chemical compounds
2005 - Elsevier BV | Polyhedron
Inamur Rahaman Laskar, Debasis Das, Golam Mostafa, Tian‐Huey Lu, Tai‐Chiun Keng, Ju-Chun Wang, Ashutosh Ghosh, Nirmalendu Ray Chaudhuri,
... K and transforms slowly to the greenish blue nitrito(O,O) isomer, cis-[NiL2(O2N)](NO2), 2. ... that 1 and 2/3 are nitro and nitrito(O,O) linkage isomers, respectively. Complexes 2 and ...
Tópico(s): Crystal structures of chemical compounds
2001 - Royal Society of Chemistry | New Journal of Chemistry
Annamaria Camus, N. Marsich, Anna Maria Manotti Lanfredi, Franco Ugozzoli, Chiara Massera,
Tópico(s): Crystal structures of chemical compounds
2000 - Elsevier BV | Inorganica Chimica Acta
Albert Escuer, Mercé Font‐Bardía, Evaristo Peñalba, N. Sanz, Xavier Soláns, Ramón Vicente,
The µ-(η1-N∶η2-O,O)-nitrito dinuclear compounds [Ni2(µ-NO2)(NCS)3(Medpt)2]·H2O 1 and [Ni2(µ-NO2)(NCS)3(dpt)2] 2, and the mononuclear nitrito compounds [Ni(NO2)(NCS)(Medpt)] 3 and [Ni( ... stabilise the tridentate co-ordination mode of the nitrito ligand. The magnetic behaviour of the dinuclear compounds ...
Tópico(s): Metal-Organic Frameworks: Synthesis and Applications
1999 - Royal Society of Chemistry | Journal of the Chemical Society. Dalton transactions