Examinando por Materia "Endocrine Disruptors"

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Acceso abierto
Determinación de bisfenol-A en aguas contenidas en botellas de plástico para beber, realizado en la ciudad de Lima – año 2017
(Universidad Privada Norbert Wiener, 2018-07-11) Garcia Gutierrez, Wenceslao Andres; Parraguez Vilchez, Walter Nicolas; Lizano Gutiérrez, Jesús Víctor
Bisphenol-A (BPA) is a chemical substance classified as an endocrine disruptor, capable of causing hormonal imbalances even at very low concentrations. It is present in various consumer products such as plastic containers, cans with protective coatings, and bottled water packaging. Given the widespread use of plastics, there is concern about the potential health risks associated with BPA exposure. This study aimed to determine the concentration of BPA in bottled water contained in plastic bottles. A total of 30 bottles from the three most consumed brands, as reported in a survey, were analyzed. The bottles were purchased from kiosks and small shops in Lima. BPA concentrations were measured using High-Performance Liquid Chromatography (HPLC) under two conditions: without stress and after exposure to heat (37°C for 7 days). The results showed that non-stressed samples had BPA readings below the detection limit of 7.190 ± 0.478 µg/L, with concentrations of 1.167 µg/L for Brand A, 3.015 µg/L for Brand B, and 2.507 µg/L for Brand C. For the stressed samples, BPA concentrations could not be determined due to increased noise and signal distortion in the HPLC detector. In none of the cases were BPA levels detected above the established detection limit. In conclusion, BPA was present in bottled water at levels below the detection threshold, while heat stress compromised accurate measurement. These findings emphasize the need for further research to assess BPA release under different environmental and storage conditions.
Acceso abierto
Determinación de bisfenol-A en tomatodos de plástico comercializados en la ciudad de Lima, año 2017
(Universidad Privada Norbert Wiener, 2018-07-10) Acosta Baldera, Carlos Enrique; Huamán Bautista, Rosmery Lisbet; Lizano Gutiérrez, Jesús Víctor
Bisphenol A (BPA) is a plasticizer that interacts with the hormonal systems of the human body. In fact, its ability to behave like estrogens (female sex hormones) has been known since the 1930s, and its effects on fertility, reproduction, and the endocrine system have been the subject of significant scientific debate in recent years. BPA is found in water bottles, baby bottles, food containers, cans with coatings, and other plastic packaging, which has raised concern, since we currently live surrounded by plastic objects that contain this toxic agent, which generally causes harm to human health. Therefore, the objective of the present study was to determine the concentration of Bisphenol A in water contained in reusable water bottles (“tomatodos”) sold in the city of Lima, subjected to the temperatures and contact times to which they are exposed on a daily basis. A total of 24 samples were taken (12 blue bottles and 12 transparent bottles). The determination was carried out by high-performance liquid chromatography (HPLC), finding that all analyzed samples presented non-detectable concentrations of BPA, below the maximum levels established by the European Food Safety Authority (EFSA).