Estudo da estabilidade do complexo ácido fítico e o íon Ni(II)

Carli, Ligia De; Rosso, Neiva Deliberali; Schnitzler, Egon; Carneiro, Paulo Irajara Borba

doi:10.1590/s0101-20612006000100004

Cited by 23 publications

(38 citation statements)

References 12 publications

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“…The third event observed in the DSC curve was exothermic (Tpeak = 325.5 °C) and corresponded to the third mass loss shown in the TG/DTG curves. Carli et al (2006) [12] had evaluated the thermal behavior of phytic acid as dipotassium salt (K2C6H18P6O24) and they had identified a sample mass loss in three stages TG/DTG and the DSC profile had occurred in three thermic events. However, we found four stages of mass loss in TG/DTG curves, which could be related to the use of phytic acid in an aqueous solution.…”

Section: Thermal Analysismentioning

confidence: 99%

“…The authors concluded that phytic acid showed optimal DPPH-scavenging activity, the highest antioxidant effect observed followed by condensed tannins and chlorophyll. In another study, Carli et al (2006) [12] evaluated the thermal behavior of phytic acid and complexation with Ni (II) and concluded that this form of dipotassium salt allowed eight sites of protonation. In a system of phytic acid with Ni (II), seven stability constants were previously obtained, which revealed that the more the phytic acid was deprotonated, stronger was the interaction with the ion Ni (II).…”

Section: Introductionmentioning

confidence: 99%

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Thermal Behavior and Free-Radical-Scavenging Activity of Phytic Acid Alone and Incorporated in Cosmetic Emulsions

et al. 2015

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Phytic acid is a natural compound widely used as depigmenting agent in cosmetic emulsions. Few studies are available in the literature covering the stability and the antioxidating property of this substance, used alone or into emulsions. Therefore, the purpose of this work was to investigate the thermal behavior and antioxidant properties of phytic acid alone and into cosmetic emulsions. The thermal behavior of this substance was evaluated by thermogravimetry (TG)/derivative thermogravimetry (DTG) and differential scanning calorimetry (DSC) and the free-radical-scavenging activity by 1,1-diphenyl-2-picrylhydrazyl (DPPH). TG/DTG and DSC curves allowed evaluation of the thermal behavior of phytic acid. These results showed that the substance presented four stages of mass loss. Thermal decomposition of the material initiated at 150 °C. Thermal behavior of the cosmetic emulsions detected that the addition of phytic acid decreased the thermal stability of the system. DPPH free-radical-scavenging activity showed that phytic acid incorporated into emulsion had no antioxidant capacity compared to BHT. In summary, we concluded that the thermoanalytical techniques (TG and DSC) were efficient and reliable in the characterization of phytic acid alone and incorporated into cosmetic emulsions. OPEN ACCESSCosmetics 2015, 2 249

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Section: Thermal Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Behavior and Free-Radical-Scavenging Activity of Phytic Acid Alone and Incorporated in Cosmetic Emulsions

et al. 2015

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“…Bebot-Brigaud [20] and Sala [21] reported studies at T = 293.15 K, Torres et al [22] at T = 310.15 K, De Carli et al [76] at T = 309.15 K and Costello [18] at 301.15 K. Some authors (Bieth [17,75] and Bebot-Brigaud [20]) used (C 2 H 5 ) 4 NClO 4 as background salt, or (C 3 H 7 ) 4 NBr (Costello [18]). Other values are reported in pure water, as in Barrè [77] and Brigando [19], Hoff-Jorgensen [78], Evans [79], De Stefano et al [23].…”

Section: Literature Comparisonmentioning

confidence: 99%

The effect of the tetraalkylammonium salts on the protonation thermodynamics of the phytate anion

Bretti

Cigala

Stefano

et al. 2014

Fluid Phase Equilibria

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“…A primeira curva da Figura 2 refere-se à titulação do ácido fítico analisada por Carli et al (2006) em ausência do íon Fe(II). A segunda curva da Figura 2, referente ao sistema ácido fítico na presença de Fe(II), encontra-se coincidente com a curva do ácido fítico isolado até o pH próximo de 6,0.…”

Section: Curvas De Titulaçãounclassified

“…De acordo com o estudo realizado por Carli et al (2006) ( estiramento assimétrico) para 987,5 e 840,9 cm -1 , respectivamente. O espectro de infravermelho do complexo ácido fítico-Fe(III), Figura 9, mostra semelhanças com o espectro do complexo ácido fítico-Fe(II).…”

Section: Estudos Espectroscópicos Na Região Do Infravermelhounclassified