Hydrotalcites as effective biocidal materials against Aspergillus niger fungus

GEOLAR FETTER; E. I. BASALDELLA; FRANCHESCOLI DIDIER VELÁZQUEZ HERRERA; A. M. PEREYRA; VILMA ROSATO,

Cancún

Simposio; Materials for Medical Applications and Health Symposium at the XXVII International Materials Research Congress- Cancun, Mexico, 19 a 24 de agosto de 2018.; 2018

International Materials Research

Aspergillus niger is the most common fungus of the genus Aspergillus, which can cause health problems including allergies and asthma. It is frequently found in fruits and vegetables, causing a disease called black mold. Also, this fungus appears on the painted surfaces of buildings producing degradation, flaking and spalling of the coating. The typical antifungal agents, such as azoles or allylamines need be supported on organic or inorganic solids. However, some inorganic solids could have antimicrobial activity by their self, as clays of the type hydrotalcites [1,2]. Hydrotalcites have shown high activity against various microorganisms, and their activity can be attributed to metallic ions or hydroxides liberated from the structure to the microorganism medium. In this work, the synthesis of hydrotalcites containing Mg, Zn and/or Cu with Al was carried out by the co-precipitation method and crystallized by conventional heating or ultrasonic irradiation and tested against Aspergillus niger. The biocidal capacity depended mainly on the synthesis conditions, the composition of the hydrotalcites and the concentrations used in microbiological tests.