Role of naphthaleneacetic acid in the degradation of bisphenol A and wastewater treatment by microalgae: Enhancement and signaling. (November 2022)

• Record Type: Journal Article
• Authors: Zhao, Zhenhao; Yang, Huiwen; Feng, Zhixuan; Huo, Yang; Fu, Liang; Zhou, Dandan
• Is Part Of: Chemosphere. Volume 307:Part 2(2022)
• Publication Date: 2022-11
• Subjects: Naphthylacetic acid (NAA) -- Bisphenol-A (BPA) -- Bioresources -- Microalgal -- Cytotoxicity resistance; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.135829
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Coupling microalgae cultivation with wastewater treatment is a promising environmentally sustainable development strategy. However, toxics such as Bisphenol A (BPA) in wastewater damage microalgae cells and reduces bioresources production. Phytohormone regulation has the potential to solve this issue. However, phytohormone research is still in its infancy. In this work, 0.2 μM naphthyl acetic acid (NAA) significantly enhanced Chlorella vulgaris BPA detoxification by 127.3% and Chlorella biomass production by 46.4%. NAA helps Chlorella convert bisphenol A into small non-toxic intermediates by enhancing the expression of associated enzymes. Simultaneously, NAA promoted carbon fixation and photosynthetic metabolism. Activation of the mitogen-activated protein kinase (MAPK) pathway strengthened the downstream antioxidant system while improving photosynthesis and intracellular starch and lipid synthesis. Carbohydrates, pigment, and lipid production was significantly enhanced by 20.0%, 46.9%, and 21.8%, respectively. A new insight is provided into how phytohormones may increase microalgae in wastewater's bioresource transformation and toxicity resistance. Graphical abstract: Image 1 Highlights: NAA could promote Chlorella to recover bioresources from BPA wastewater. NAA enhanced Chlorella specific growth rate and BPA removal by 59% and 127.3%. NAA suppressed oxidative stress by regulating antioxidant defense metabolic network. NAA-induced MAPK pathway regulation increased the elimination of antioxidants. Carbohydrates, pigments, and lipids production increased by 46.9%, 20.0%, and 21.8%.