Humic acids: Structural properties and multiple functionalities for novel technological developments

Autor(es)

Gomes de Melo, Bruna Alice ^[1] ; Motta, Fernanda Lopes ^[1] ; Andrade Santana, Maria Helena ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Chem Engn, Dev Biotechnol Proc Lab, BR-13083852 Sao Paulo - Brazil

• Tipo de documento: Artigo de Revisão
• Fonte: Materials Science & Engineering C-Materials for Biological Applications; v. 62, p. 967-974, MAY 1 2016.
• Citações Web of Science: 71

Resumo

Humic acids (HAs) are macromolecules that comprise humic substances (HS), which are organic matter distributed in terrestrial soil, natural water, and sediment. HAs differ from the other HS fractions (fulvic acid and humins) in that they are soluble in alkaline media, partially soluble in water, and insoluble in acidic media. Due to their amphiphilic character, HAs form micelle-like structures in neutral to acidic conditions, which are useful in agriculture, pollution remediation, medicine and pharmaceuticals. HAs have undefined compositions that vary according to the origin, process of obtainment, and functional groups present in their structures, such as quinones, phenols, and carboxylic acids. Quinones are responsible for the formation of reactive oxygen species (ROS) in HAs, which are useful for wound healing and have fungicidal/bactericidal properties. Phenols and carboxylic acids deprotonate in neutral and alkaline media and are responsible for various other functions, such as the antioxidant and anti-inflammatory properties of HAs. In particular, the presence of phenolic groups in HAs provides antioxidant properties due to their free radical scavenging capacity. This paper describes the main multifunctionalities of HAs associated with their structures and properties, focusing on human health applications, and we note perspectives that may lead to novel technological developments. To the best of our knowledge, this is the first review to address this topic from this approach. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/05525-4 - Produção e caracterização de nanopartículas de ácidos húmicos e avaliação do seu efeito fungicida visando tratamento de onicomicose
• Beneficiário: Fernanda Lopes Motta
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado