AUREA BEATRIZ CERQUEIRA GERALDO

AUREA BEATRIZ CERQUEIRA GERALDO

(Fonte: Lattes)

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Licenciada e bacharel em Química pela Universidade Federal do Paraná (1991), mestre em Físico-Química pela Universidade Estadual de Campinas (1993) e doutora em Engenharia Metalúrgica e de Materiais pela Universidade Federal do Rio de Janeiro (1998). Atualmente é tecnologista do Instituto de Pesquisas Energéticas e Nucleares. Atua principalmente nos seguintes temas: a) eletroquímica: eletroanalítica, eletrodissolução/eletrodeposição, b) materiais modificados por radiação: modificação e caracterização de materiais poliméricos, caracterização de materiais ligados a radioisótopos, estudo e caracterização de materiais para a produção de radioisótopos primários e c) ensino de química (Texto extraído do Currículo Lattes em 4 out. 2021)

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Effect of ionizing irradiation on tilapia (Oreochromis niloticus) skin
2011 - FROSE, C.A.P.; MOURA, E.; YAMAGUISHI, R.B.; SOMESSARI, E.S.R.; SILVEIRA, C.G.; LEME, E.; GERALDO, A.B.C.; MANZOLI, J.E.
The culture of tropical tilapia (Oreochomis niloticus), as a non-native freshwater fish specie in Brazil, have had importance in the last decade due its fast growing, fast reproduction characteristics, high tolerance of climate variations in our country and high disease resistance. The high demand of whole fish or fillets is related to its good taste. Althought, its skin, that represents from 4.5 % to14 % of fish weight, is a byproduct that is generally discared or sold at low cost to feed mills. The general animal skin composition comprises protein, water, minerals and fatty matter where the relative portions of these materials depends of upon animal specie, age, breed, feeding and other animal habits. The putrecible raw animal skins can be chemically and physically treated to make it in non-putrecible stabilized material; it results in a soft and flexible polymeric material. The chemical process to obtain this material generally involves a crosslinking of carboxyl groups or amino groups of skin proteins and the chemical reactive specie [1]. Also, physical process as UV irradiation have been successfully employed to crosslink collagenous biomaterials and thus, improved some mechanical characteristics [2]. The goal of this work was to study the tilapia skins exposed to ionizing irradiation from electron beams. The raw skins and the chemically degreased skins were the studied materials. The tensile strenght and elongation at break were the mechanical parameters evaluated. The optical microscopy was used to evaluate some histological characteristics in irradiated and non-irradiated samples. Also, the polymeric product obtained when skins are treated with oxidizing ions were used to compare some results. The tilapia raw skins were kindly available by APTA, a governmental agribusiness technological agency. These skins were scales free, slighted and frosted. The skins were irradiated in atmosphere air on a Job 188 Dynamitron® Electron Beam Accelerator with 1.5 MeV energy under comprised doses of 20 kGy and 40 kGy and dose rates of 2.2 kGy/s and 7.4 kGy/s. The mechanical parameters were measured at a Lloyd LXR tensile tester at a crosshead speed of 10.00 mm/min. Irradiated samples shows high integrity and high tensile strength in comparison to the polymeric product obtained by oxidizing ions reaction. These results are discussed.
Study of bixin oxidation by ionizing irradiation
2017 - FONSECA, THAIS N.; TEIXEIRA, PAULA S.; MOURA, EDUARDO de; GERALDO, AUREA B.C.
Brazil is the world's largest producer of anatto, followed by Kenya and Peru. The fruit of the annatto tree is constituted by a capsule containing external spines and internal seeds with reddish coloration, providing a natural pigment which is environmentally efficient, being able to replace synthetic pigments and dyes. The active substance of the pigment is Bixin, which is a type of carotenoid which constitutes a greater percentage of pigment in these seeds and has a lipo soluble character. Bixin reacts with NaOH in a saponification reaction giving norbixin, which is water soluble. It is known that the destination of the dye extracted from the fruit is intended for industry, especially the food industry. The culture of annatto tree brings prospects of development in agricultural programs for medium and small producers, which are able to use decadent areas of other crops. In addition to the food sector, new applications for the pigment helps the development of family farming. The pigment extracted from annatto undergoes a natural oxidation; this work aims to evaluate this phenomenon and also the oxidation of the pigment after the irradiation process. This work also evaluates of the how the oxidation process is affected by irradiation and the modifications introduced to irradiated pigments. Irradiated and nonirradiated samples were characterized by thermogravimetry, UV-vis spectrophotometry and infrared spectroscopy (FTIR). The results are then discussed.
Evaluation of electron beam irradiation under heating process on vulcanized EPDM
2015 - GABRIEL, LEANDRO; CARDOSO, JESSICA R.; MOURA, EDUARDO; GERALDO, AUREA B.C.
Irradiation process applied in fishs scales: in improvement of its capacity for metallic sorption
2014 - BAZANTE YAMAGUISHI, RENATA; GERALDO, AUREA B.C.; MOURA, EDUARDO