Enzymatic oxidation of volatile malodorous organosulfur compounds in a two-phase reactor

Julio C. Cruz, Jesús García, Marcela Ayala

Resumen


In this work we report the oxidation of volatile organosulfur compounds (VOC) catalyzed by the enzyme chloroperoxidase from Caldariomyces fumago. VOC are regarded as atmospheric pollutants due to their unpleasant odor and low detection threshold. Diethyl sulfide, dimethyl disulfide, propanethiol, butanethiol and hexanethiol were found to be substrates for the enzyme in a liquid medium reaction at pH 6, under peroxidatic conditions. Product analysis showed that sulfides were oxidized to their respective sulfoxides whereas thiols were oxidized to the corresponding disulfides. The identified products showed significantly lower vapor pressure than the parental compounds; thus, the products are not considered atmospheric pollutants. A 70-mL two-phase reactor was assembled in order to determine the efficiency of the enzymatic treatment. The liquid phase, consisting of 15% organic solvent and 85% buffer, was contacted with the gaseous phase, consisting of a substrate-enriched air stream. Using dimethyl disulfide as model substrate, we found that only enzymatic oxidation occurred in this system; by controlling the enzyme and peroxide concentration, we found that the substrate is transferred to the aqueous phase where 1 mol of enzyme converted approximately 12,400 mol of substrate, thus highlighting the potential of enzymatic treatment of malodorous gaseous streams.

Palabras clave


Environmental biocatalysis; organosulfur compounds; chloroperoxidase; peroxidation; volatile substrates

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DOI: https://doi.org/10.1016/j.recqb.2015.05.001

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Proyecto C-290903

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TIP REVISTA ESPECIALIZADA EN CIENCIAS QUÍMICO-BIOLÓGICAS, Volumen 23, 2020, es una publicación editada por la Universidad Nacional Autónoma de México, Ciudad Universitaria, Deleg. Coyoacán, C.P. 04510, Ciudad de México, México, a través de la Facultad de Estudios Superiores Zaragoza, Campus I, Av. Guelatao # 66, Col. Ejército de Oriente, Deleg. Iztapalapa, C.P. 09230, Ciudad de México, México, Teléfono: 55.56.23.05.27, http://tip.zaragoza.unam.mx, Correo electrónico revistatip@yahoo.com, Editor responsable: Dra. Martha Asunción Sánchez Rodríguez, Certificado de Reserva de Derechos al Uso Exclusivo del Título No. 04-2014-062612263300-203, ISSN: 2395-8723 ambos otorgados por el Instituto Nacional del Derecho de Autor, Responsable de la última actualización de este número Claudia Ahumada Ballesteros, Facultad de Estudios Superiores Zaragoza, Av. Guelatao # 66, Col. Ejército de Oriente, Deleg. Iztapalapa, C.P. 09230, Ciudad de México, México, fecha de la última modificación, 28 de julio de 2020.

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