scholarly journals Characterization of Environmental Dust in the Dammam Area and Mud After-Effects on Bisphenol-A Polycarbonate Sheets

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Bekir Sami. Yilbas ◽  
Haider Ali ◽  
Naseer Al-Aqeeli ◽  
Mazen M. Khaled ◽  
Syed Said ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Bisphenol A Polycarbonate ◽  
After Effects

Synthesis and characterization of sulfonated telechelic bisphenol A polycarbonate ionomers

2011 ◽  
Vol 71 (10) ◽  
pp. 1001-1007 ◽  
Author(s):  
Martino Colonna ◽  
Corrado Berti ◽  
Enrico Binassi ◽  
Maurizio Fiorini ◽  
Simone Sullalti ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Synthesis And Characterization ◽  
Bisphenol A Polycarbonate

Preparation and Characterization of Bisphenol a Polycarbonate Facilitated by Supercritical Impinging Stream

2014 ◽  
Vol 875-877 ◽  
pp. 101-105
Author(s):  
Yang Xiao ◽  
Ai Qing Zhang
Keyword(s):  
Mass Transfer ◽  
Bisphenol A ◽  
Gel Permeation Chromatography ◽  
Diphenyl Carbonate ◽  
Infrared Spectrophotometry ◽  
Bisphenol A Polycarbonate ◽  
Synthetic Process ◽  
Ft Ir ◽  
C Nmr

Based on the supercritical impinging stream technique, a novel synthetic process for preparing aromatic polycarbonate (PC) by transesterification between bisphenol-A (BPA) and diphenyl carbonate (DPC) was developed. Supercritical carbon dioxide (ScCO2) is an excellent plasticizing agent and a good solvent for phenol, the by-product of the reaction. Impinging stream can markedly enhance heat and mass transfer, especially mass transfer between phases. In this process, phenol formed from the reaction was dissolved and diffused into ScCO2 phase and the transfer process were accelerated through the impingement of two flows. The structure of the product was characterized by Fourier transform infrared spectrophotometry (FT-IR), 1H-nuclear magnetic resonance (NMR) and 13C-NMR measurements. Thermal analysis was measured by a differential scanning calorimeter (DSC). The PC molecular weight (MW) was determined by gel permeation chromatography (GPC) and can reach up to 4.28×104 g/mol.

scholarly journals Changes Caused by Low Doses of Bisphenol A (BPA) in the Neuro-Chemistry of Nerves Located in the Porcine Heart

Animals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 780
Author(s):  
Krystyna Makowska ◽  
Slawomir Gonkowski
Keyword(s):  
Bisphenol A ◽  
Endocrine Disruptor ◽  
Sympathetic Innervation ◽  
Daily Intake ◽  
Everyday Objects ◽  
Living Organisms ◽  
The Impact ◽  
Heart Wall ◽  
Cholinergic Structures

Bisphenol A (BPA) contained in plastics used in the production of various everyday objects may leach from these items and contaminate food, water and air. As an endocrine disruptor, BPA negatively affects many internal organs and systems. Exposure to BPA also contributes to heart and cardiovascular system dysfunction, but many aspects connected with this activity remain unknown. Therefore, this study aimed to investigate the impact of BPA in a dose of 0.05 mg/kg body weight/day (in many countries such a dose is regarded as a tolerable daily intake–TDI dose of BPA–completely safe for living organisms) on the neurochemical characterization of nerves located in the heart wall using the immunofluorescence technique. The obtained results indicate that BPA (even in such a relatively low dose) increases the number of nerves immunoreactive to neuropeptide Y, substance P and tyrosine hydroxylase (used here as a marker of sympathetic innervation). However, BPA did not change the number of nerves immunoreactive to vesicular acetylcholine transporter (used here as a marker of cholinergic structures). These observations suggest that changes in the heart innervation may be at the root of BPA-induced circulatory disturbances, as well as arrhythmogenic and/or proinflammatory effects of this endocrine disruptor. Moreover, changes in the neurochemical characterization of nerves in the heart wall may be the first sign of exposure to BPA.

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