![]() Varregoso J (2006) Braquiterapia Prostática. Nukleonika 53:S99–S103īlasko JC, Grimm PD, Ragde H (1993) Brachytherapy and organ preservation in the management of carcinoma of the prostate. Rostelato M, Rela P, Zeituni C et al (2008) Development and production of radioactive sources used for cancer treatment in Brazil. doi: 10.1016/j.urology.2005.11.008įranca CADS, Vieira SL, Bernabe AJS, Penna ABR (2007) The seven-year preliminary results of Brachytherapy with Iodine-125 seeds for localized prostate cancer treated at a Brazilian single-center. Jani AB, Feinstein JM, Pasciak R et al (2006) Role of external beam radiotherapy with low-dose-rate brachytherapy in treatment of prostate cancer. Instituto National de Cancer (2014) Estimativa 2014-Incidência de câncer no Brasil. International Agency for Research on Cancer (2014) World cancer factsheet. Changes in thermal properties, such as melting point, glass transition temperature and enthalpy of crystallisation and fusion, were also observed after irradiation. The molecular weight of all samples irradiated decreased in a dose-dependent fashion-up to 56 % loss for 10 kGy and 72 % for 50 kGy-but were less pronounced for higher doses. Doses commonly applied to sterilise materials for biomedical applications were employed-10, 18, 25 and 50 kGy. The effects of gamma radiation on PLGA were also studied. A slight increase in the racemisation with time was also observed. The reactions performed with the zirconium initiator showed a higher degree of racemisation when compared to those performed with Sn(Oct) 2. The degree of racemisation also depends on the initiator used. Although the zirconium alkoxide initiator is slower than the most commonly used Sn(Oct) 2, relatively high molecular weights were obtained at a temperature of 130 ☌, for a monomer to initiator ratio of 1000/1 (24 h) and 5000/1 (48 h). In this paper, we report the preparation and characterisation of poly(lactic-co-glycolic) acid (PLGA) using a C 3-symmetric Zr (IV) amine tris(phenolate) alkoxide initiator. ![]()
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