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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Photolysis of parabens using medium-pressure mercury lamps: Toxicity effects in MCF7, Balb/c 3T3 cells and Ceriodaphnia dubia

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Gomes, Francisco E. R. [1] ; Bergo, Patricia L. S. [2, 3] ; Trap, Marilia A. [2] ; Spadoto, Mariangela [4] ; Galinaro, Carlos A. [3] ; Rodrigues-Filho, Edson [2] ; Leitao, Andrei [3] ; Tremiliosi-Filho, Germano [3]
Total Authors: 8
[1] Fed Inst Educ Sci & Technol Mato Grosso, BR-78850000 Primavera Do Leste, MT - Brazil
[2] Univ Fed Sao Carlos, Dept Chem, CP 676, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Sao Paulo, Sao Carlos Inst Chem, Av Trabalhador Sao Carlense 400, CP 780, BR-13560970 Sao Carlos, SP - Brazil
[4] Univ sao Paulo, Sao Carlos Engn Sch, Av Trabalhador Sao Carlense 400, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Chemosphere; v. 208, p. 325-334, OCT 2018.
Web of Science Citations: 4

Degradation studies of the propylparaben (PrP), butylparaben (BuP) and of the propylparaben-butylparaben mixture (PrP-BuP) in deionized water and surface river water was investigated as a function of pH and initial concentration of the reactants using a medium-pressure mercury lamp. The photolysis of parabens (concentration ranging from 5 to 30 mg L-1) followed apparent pseudo-first-order kinetics, with rate constants (k) in deionized water and surface river water changed from 1.80 x 10(-1) to 3.68 x 10(-2) min(-1) and 1.43 x 10(-1) to 1.45 x 10(-2) min(-1), respectively. Degradation reaction was faster at pH 5 in comparison with pH 7 or 11. The photolysis of parabens was greater than 91%, with low mineralization (26.15%) observed in acidic medium after 95 min. Analysis by chromatography coupled to mass spectrometry (LC-MS/MS) showed that only one product was generated during the degradation reaction and has UV bands similar to 3,4-dihydroxybenzoic acid. Estrogenic activity tests showed that non degraded parabens stimulated the growth of breast adenocarcinoma (MCF-7) cells and this effect was evaluated after the photolysis. Cytotoxicity assays using fibroblasts cells (Balb/C 3T3 clone A31) indicated that the parental compounds and degradation products were not cytotoxic. On the contrary, non-degraded parabens were toxic to Ceriodaphnia dubia, but the product of photolysis was not. Overall, the photolytic method presented was able to degrade these parabens providing safe and non-estrogenic reaction product. (C) 2018 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 11/24137-0 - Method development and validation for standardization of Morus spp. leaves extracts and evaluation of biological activity of phytotherapic formulation for climacteric symptoms treatment
Grantee:Patrícia Luísa de Souza Bergo
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 11/07025-3 - In silico studies and cell-based assays to identify new therapeutic approaches to prostate cancer
Grantee:Andrei Leitão
Support Opportunities: Regular Research Grants