scholarly journals Characterization of Copoly(p-hydroxybenzoate/bisphenol A terephthalate) by NMR Spectroscopy

1996 ◽  
Vol 28 (10) ◽  
pp. 896-900 ◽  
Author(s):  
Yong Wang ◽  
Dacheng Wu ◽  
Xingguang Xie ◽  
Ruixia Li
Keyword(s):  
Nmr Spectroscopy ◽  
Bisphenol A

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.

scholarly journals Use of Solid-State NMR Spectroscopy for the Characterization of Molecular Structure and Dynamics in Solid Polymer and Hybrid Electrolytes

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1207
Author(s):  
Gabrielle Foran ◽  
Nina Verdier ◽  
David Lepage ◽  
Cédric Malveau ◽  
Nicolas Dupré ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solid State Nmr ◽  
Pulse Sequence ◽  
Dynamic Properties ◽  
Double Resonance ◽  
Solid Polymer ◽  
Pulse Field ◽  
Solid State Nmr Spectroscopy

Solid-state NMR spectroscopy is an established experimental technique which is used for the characterization of structural and dynamic properties of materials in their native state. Many types of solid-state NMR experiments have been used to characterize both lithium-based and sodium-based solid polymer and polymer–ceramic hybrid electrolyte materials. This review describes several solid-state NMR experiments that are commonly employed in the analysis of these systems: pulse field gradient NMR, electrophoretic NMR, variable temperature T1 relaxation, T2 relaxation and linewidth analysis, exchange spectroscopy, cross polarization, Rotational Echo Double Resonance, and isotope enrichment. In this review, each technique is introduced with a short description of the pulse sequence, and examples of experiments that have been performed in real solid-state polymer and/or hybrid electrolyte systems are provided. The results and conclusions of these experiments are discussed to inform readers of the strengths and weaknesses of each technique when applied to polymer and hybrid electrolyte systems. It is anticipated that this review may be used to aid in the selection of solid-state NMR experiments for the analysis of these systems.

scholarly journals Characterization of hemicelluloses from leaves and tops of the CC 8475, CC 8592, and V 7151 varieties of sugarcane (Saccharum officinarum L

DYNA ◽  
2019 ◽  
Vol 86 (210) ◽  
pp. 98-107
Author(s):  
Luz Marina Flórez Pardo ◽  
Andrea González Córdoba ◽  
Jorge Enrique López Galán
Keyword(s):  
Nmr Spectroscopy ◽  
Saccharum Officinarum ◽  
Sodium Chlorite ◽  
Bioethanol Production ◽  
Valle Del Cauca ◽  
Main Components ◽  
Holocellulose Content ◽  
Potential Use

In this research, the types of hemicellulose that predominate in the leaves and tops of the three most cultivated varieties (CC 8475, CC 8592, V 7151) of sugarcane (Saccharum officinarum L.) in Valle del Cauca, Colombia were determined. Hemicellulose analyses were performed after delignification with sodium chlorite and extraction with 18% NaOH and 24% KOH containing 0.26 M NaBH4. The main components of hemicellulose were identified via FTIR and NMR spectroscopy, and monomeric sugars were identified via HPLC. Hemicellulose A composed of arabinoxylans, glucomannans and arabinogalactactans and hemicellulose B primarily composed of arabinoxylans were extracted. The hemicelluloses of the Colombian varieties were more stable against heat than those of the Venezuelan variety. The results of this project allowed discovery of the potential use of agricultural sugarcane residues for bioethanol production because they have a holocellulose content of more than 60%.

Metabolic Characterization of the R6/2 Transgenic Mouse Model of Huntington's Disease by High-Resolution MAS1H NMR Spectroscopy

2006 ◽  
Vol 5 (3) ◽  
pp. 483-492 ◽  
Author(s):  
Tsz M. Tsang ◽  
Ben Woodman ◽  
Gerard A. Mcloughlin ◽  
Julian L. Griffin ◽  
Sarah J. Tabrizi ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
Mouse Model ◽  
Huntington's Disease ◽  
Huntington’S Disease ◽  
Transgenic Mouse ◽  
Transgenic Mouse Model

scholarly journals Characterization of β-Amino Ester Enolates as Hexamers via6Li NMR Spectroscopy

2004 ◽  
Vol 126 (19) ◽  
pp. 5938-5939 ◽  
Author(s):  
Anne J. McNeil ◽  
Gilman E. S. Toombes ◽  
Sithamalli V. Chandramouli ◽  
Benoit J. Vanasse ◽  
Timothy A. Ayers ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Amino Ester
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