The purpose of this study was to assess in vitrocytotoxicity of natural rubber (NR) latex membranes stabilized with different concentrations of ammonia, as well as evaluate possible changes in oxidative stressparameters. To this end, CHO-k1 cells were exposed to NR membranes for 24 h. Cytotoxicity wasassessed by the MTT assay and the oxidative stress parameters were established by glutathione (GSH) and malondialdehyde (MDA) levels. The results show that the ammonia present in the NR latex membranes can deplete cell viability and enhance GSH consumption in the cells. NR latex membranes stabilized with 2.0% of ammonia were cytotoxic to the cell lineage used in this study. From these results, it is possible to infer that the use of ammonia to stabilize NR latex membranes with biomedical purposes has to bedone carefully, to avoid possible harmful effects to human health.
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