A study of temperature effect on chemical, structural and transport parameters determined for two different regenerated cellulose membranes

Vázquez, M.I.; Benavente, J.

doi:10.1016/s0376-7388(03)00179-0

Cited by 24 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6. The small differences obtained in the background for 2000-3000 cm −1 among membrane C5 and the irradiated samples (C5-Ir10 and C5-Ir80) may be due to chemical modification of the cellulose matrix, but the result obtained for the annealed sample (heated at 60 • C for 4 h) indicates that another kind of modification should also exists; particularly, changes in hydrodynamic permeability of the annealed samples were obtained [17]. Similar behaviour is assumed for the other cellulosic membranes [26].…”

Section: Resultsmentioning

confidence: 87%

“…It is also important to point out that membranes used for medical and biological applications are commonly sterilized by using temperature or radiation [11,12], which can modify the membrane parameters [13][14][15][16]. In fact, the effect of these treatments on hydrodynamic and electrical parameters as well as the chemical modification caused in a given cellophane membrane (containing 0.05 kg/m 2 regenerated cellulose) has already been considered [17,18]. Moreover, differences in transport parameters across cellulosic membranes depending on the cellulose concentration and chemical conditions in the manufacturing casting solution have recently been reported, and the results show a sharp water flux reduction when the cellulose concentration increases, which is associated to changes in the membrane structure [19]; then, the effect of membrane treatment on transport parameters might be related to the manufacturing conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modification of cellulose based membranes by γ-radiation: Effect of cellulose content

Lara

Vázquez

Galán

et al. 2006

Journal of Membrane Science

Self Cite

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Modification of cellulose based membranes by γ-radiation: Effect of cellulose content

Lara

Vázquez

Galán

et al. 2006

Journal of Membrane Science

Self Cite

View full text Add to dashboard Cite

“…70,71 Therefore, EIS was used to investigate the nature of ST and AA interaction at PEDOT/Pt surface in the presence of SDS. In EIS, the semicircle diameter equals the electron transfer resistance.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Determination of Catecholamines and Serotonin on Poly(3,4-ethylene dioxythiophene) Modified Pt Electrode in Presence of Sodium Dodecyl Sulfate

Atta

Ahmed²

2011

J. Electrochem. Soc.

View full text Add to dashboard Cite

A promising electrochemical sensor was developed using poly(3,4-ethylene dioxythiophene) modified platinum electrode in the presence of sodium dodecyl sulphate (SDS). This sensor is sensitive for the determination of catecholamine compounds, namely dopamine, epinephrine, L-norepinephrine, and L-DOPA, as well as serotonin (ST) in the presence of interference molecules such as uric acid, ascorbic acid (AA), and glucose. The presence of SDS in the medium plays a key role in the electrostatic attraction of these compounds toward the polymeric surface and causes repulsion toward the interfering ones. Cyclic voltammetry, linear sweep voltammetry, ultraviolet-visible (UV-vis), nuclear magnetic resonance and electrochemical impedance spectroscopy were used to verify the behavior of the studied compounds in micellar media. In the presence of an anionic surfactant, the presence of large excess of AA and glucose did not interfere with the voltammetric responses of catecholamine and ST. The linear response was obtained for serotonin in the range of 0.05-10 lmol l À1 and 20-100 lmol l À1 with correlation coefficients of 0.997 and 0.998 and detection limits 48 and 71 nmol l À1 , respectively. The utility of this modified electrode was demonstrated for the determination of ST in human urine.There is considerable interest in developing electrochemical techniques for measurement of catecholamines such as epinephrine (E), norepinephrine (NE), dopamine (DA), and serotonin (ST), which are important neurotransmitters in mammalian species. 1 DA is widely distributed in the brain tissues for message transfer in mammalian central nervous system. The deficiency of DA can result in some neurological disorders such as schizophrenia and Parkinson's disease. 2-4 ST is also distributed in the brain and plays a crucial role in emotional system together with other neurotransmitters. Uric acid (UA) is the primary end product of purine metabolism. Abnormal levels of UA are symptoms of several diseases such as hyperuricaemia, gout, and Lesch-Nyan disease. 5 Thus, detecting and determining the concentrations of catecholamines in the presence of interfering species is an important goal in electrochemical analysis. Much attention has been given to the design and development of novel materials coated on electrode surfaces with improved molecular recognition capabilities. 6-9 The determination of monoamine neurotransmitters have been carried out by using spectrophotometery, 10 fluorescence, 11 chemical luminescence, 12 pseudopolarography, 13 voltammetry, 14 capillary electrophoresis, 15 and sensors based on enzymatic amplification. 16 High performance liquid chromatography (HPLC) with electrochemical detection is most often used for the analysis of catecholamines and their metabolites. 1,16-18 The detection of neurotransmitters and their metabolites by electrochemical methods have attracted great interests because of their simplicity, rapidness, high sensitivity, and the ability of sensing neurotransmitters in living organisms and in vivo real time an...

show abstract

“…It is well known that electrochemical alternating current impedance technique is a useful tool for studying the interface properties of surface-modified electrodes [47][48][49][50]. Therefore, EIS was used to investigate the nature of DA interaction at SDS/PEDOT surface.…”

Section: Electrochemical Impedance Spectroscopy (Eis) Of Dopaminementioning

confidence: 99%

Poly(3,4-ethylene-dioxythiophene) electrode for the selective determination of dopamine in presence of sodium dodecyl sulfate

Atta

Galal

Ahmed

2011

Bioelectrochemistry

106

View full text Add to dashboard Cite

A study of temperature effect on chemical, structural and transport parameters determined for two different regenerated cellulose membranes

Cited by 24 publications

References 23 publications

Modification of cellulose based membranes by γ-radiation: Effect of cellulose content

Modification of cellulose based membranes by γ-radiation: Effect of cellulose content

Simultaneous Determination of Catecholamines and Serotonin on Poly(3,4-ethylene dioxythiophene) Modified Pt Electrode in Presence of Sodium Dodecyl Sulfate

Poly(3,4-ethylene-dioxythiophene) electrode for the selective determination of dopamine in presence of sodium dodecyl sulfate

Contact Info

Product

Resources

About