ANDREZA APARECIDA DEL CARMEN CASTRO GONZALEZ
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Artigo IPEN-doc 26316 Gold nanoparticle applied to brachytherapy2019 - GONZALEZ, ANDREZA A.D.C.C.; SOUZA, CARLA D.; ARCOS, WILMER A.; RODRIGUES, BRUNA T.; DOMINGUES, PAULO R.; SPINOSA, TATYANA B.; ROSTELATO, MARIA E.C.M.Cancer is a global public health problem, that consists in a disease is characterized by the uncontrolled growth of anomalous cells that impair the functioning of the body. One of the treatments for cancer is the brachytherapy. This technique a non-invasive treatment in which the radiation is placed close or in contact with the region to be treated, brachytherapy may save the healthy tissues and consequently reduces the amount of side effects. An unexplored strand is nanobrachytherapy, that unites the advantages of brachytherapy with the small size in the nanoparticle (NP), resulting in an even less invasive treatment. Nanotechnology is the science that studies the properties of nanometric materials with the aim of creating new materials with different properties of interest. In view of the synthesis of the NP and their applicabilities, there is a fundamental role that is made to coatings, which have the function of avoiding the aggregation of particles, stabilize and also control their functional properties. Besides being able to add molecules of interest, such as antibiotics and anti-inflammatories. Among the range of coatings, the most outstanding are polyethylene glycol (PEG). PEG improves the surface properties of NP and presents high stability under biomedical conditions. The NP have their size controlled, which facilitates their penetration into the vasculature, in addition to being a non-toxic coating. After the synthesis of gold nanoparticles (Au-NP) was developed, PEG were successfully incorporated into the surface. Incorporation was confirmed by DLS, FT-IR and HRTEM.Artigo IPEN-doc 24173 Coatings of nanoparticles applied to brachytherapy treatments2017 - GONZALEZ, ANDREZA A.D.C.C.; ROSTELATO, MARIA E.C.M.; SOUZA, CARLA D.; RODRIGUES, BRUNA T.; SOUZA, DAIANE C.B.; ZEITUNI, CARLOS A.; NOGUEIRA, BEATRIZ R.Resumo IPEN-doc 23127 Experiment to access Iodine-125 leakage in different vials2017 - SOUZA, C.D. de; ROSTELATO, M.C.M.; ZEITUNI, C.; COSTA, O. da; RODRIGUES, B.T.; GONZALEZ, A.C.; MARQUES, J. de O.Purpose: There are several challenges when developing a laboratory to produce radioactive sources. From choosing a prototype to radiation safety, the task is enormous. During the past 15 years, our research group is developing a laboratory to produce iodine-125 seed. These seeds are placed inside the cancer and release radiation directly in the target. The whole production line is full of new process and innovations. Among those, a new chemical reaction that deposit iodine-125 onto silver (core) was developed. This paper presents a comparison between vials in order to access their capability to retain radioactive iodine. Also, the fixation percentage in a silver core was taken into account. This information will be used to select a vial to be implemented at the iodine-125 sources manufacture laboratory. Methods: Vials made with polymers and glass was tested. Iodine-125 were placed in the vials overnight at rt. Seven vials with different materials (glass, dark glass, and plastics) were evaluated. Results: The selected vial (borosilicate glass 1 mL total volume) loss 17.61% of iodine in 24 hours and presented the highest iodine intake. It was noticeable that the vial material influenced both iodine intake and iodine loss. The goal is to maximize the reaction yield to result in a less costly product. Conclusion: We have selected the best vial for our reaction in regards to leakage and yield.