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Bioseguridad en la utilización del bromuro de etidio en los laboratorios de biología molecular

Authors: Castro-Chacín, Luis D.; Díaz-Martinez, Luis A.;

Bioseguridad en la utilización del bromuro de etidio en los laboratorios de biología molecular

Abstract

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Resumen El bromuro de etidio C21H20N3Br (bromuro de 3,8-diamino-5-etil-6-fenilfenantridina), comúnmente conocido como BrEt, es un agente intercalante no reactivo, utilizado en laboratorios de biología molecular como marcador para la identificación y visualización de bandas de ácidos nucleicos. El BrEt se adhiere a las moléculas de ácido nucleico, provocando un contraste entre el gel y las bandas, que en presencia de luz ultravioleta emite una luz rojo – naranja. Aunque el BrEt es un agente tóxico clasificado como mutagénico, sospechoso de ser teratógeno y carcinógeno, se usa ampliamente en laboratorios de biología molecular a concentraciones bajas (0,01 µg.mL-1). Además, es de menor costo, en comparación con otros productos de acción similar, como Sybr Safe (Invitrogen®), Gel Red (Biotum®) o verde Midori (NipponGenetics®). Como cualquier sustancia de naturaleza química compleja, requiere de la formación adecuada del personal técnico e investigadores para su uso y conocimiento de las normas de seguridad necesarias en su manipulación, almacenamiento y disposición final. Por tanto, el objetivo de este trabajo fue proporcionar una información inicial del BrEt para que las personas que emplean este producto químico, puedan planificar estrategias de higiene, prevención, bioseguridad, salud y seguridad laboral en los laboratorios de biología molecular. Abstract Ethidium bromide C21H20N3Br (3,8-diamino-5-ethyl-6-phenylphenanthridine bromide), commonly known as BrEt, is a non-reactive intercalating agent, used in molecular biology laboratories as a marker for the identification and visualization of nucleic acids bands. BrEt adheres to nucleic acid molecules, causing a contrast between the gel and the bands, which in the presence of ultraviolet light emits a red-orange light. Although BrEt is a toxic agent classified as mutagenic, suspected of being teratogenic and carcinogenic, is widely used in molecular biology laboratories at low concentrations (0,01 µg.mL-1). In addition, it is lower in cost compared to other products of similar action, such as Sybr Safe (Invitrogen®), Gel Red (Biotum®) or Midori green (NipponGenetics®). Like any substance of a complex chemical nature, it requires the adequate training of technical personnel and researchers for its use and knowledge of the safety standars necessary for its handling, storage and final disposal. Therefore, the objective of this work was to provide initial information about BrEt, so that people who use this chemical product can plan hygiene, prevention, biosafety, health and occupational safety strategies in molecular biology laboratories.

Keywords

Agente intercalante, occupational health, Bioseguridad, Intercalating agent, toxicity, Biosafety, Toxicidad, Riesgo, Salud ocupacional, risk

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