Solution and diffusion properties of cyclohexane, cyclohexanol, and cyclohexanone in poly(ethylene glycol) by inverse gas chromatography

2011 ◽  
Vol 123 (1) ◽  
pp. 124-134 ◽  
Author(s):  
Chuyi Zeng ◽  
Min Huang ◽  
Hong Zhao ◽  
Jicheng Zhou ◽  
Jiding Li
Keyword(s):  
Gas Chromatography ◽  
Ethylene Glycol ◽  
Inverse Gas Chromatography ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene ◽  
And Diffusion ◽  
Diffusion Properties

scholarly journals Dispersive Surface Energy and Acid-Base Parameters of Tosylate Functionalized Poly(ethylene glycol) via Inverse Gas Chromatography

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Feyza Sesigur ◽  
Dolunay Sakar ◽  
Ozlem Yazici ◽  
Fatih Cakar ◽  
Ozlem Cankurtaran ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Free Energy ◽  
Ethylene Glycol ◽  
Inverse Gas Chromatography ◽  
Basic Medium ◽  
Poly Ethylene Glycol ◽  
Dispersive Component ◽  
Dispersive Surface Energy ◽  
Base Parameters ◽  
Poly Ethylene

An inverse gas chromatographic (IGC) study of the sorption properties of poly(ethylene glycol) modified with tosylate (PEG-TOS) was presented. PEG-TOS was synthesized via the tosylation of the corresponding poly(ethylene glycol) (PEG) withp-toluenesulfonyl chloride in the basic medium. The synthesized PEG-Tos was characterized by FTIR-ATR and1HNMR techniques. The retention diagrams of n-hexane, n-heptane, n-octane, n-nonane, n-decane, dichloromethane, chloroform, acetone, tetrahydrofuran, ethyl acetate, and ethanol on the PEG and PEG-Tos were plotted at temperatures in K between 303 and 373 by inverse gas chromatography technique. The dispersive component of the surface-free energy,γSD, of studied adsorbent surface was estimated using retention times of different nonpolar organics in the infinite dilution region. Thermodynamic parameters of adsorption (free energy,ΔGAS, enthalpy,ΔHAS, and entropy,ΔSAS), dispersive components of the surface energies,γSD, and the acid,KA, and base,KD, constants for the PEG and PEG-Tos were calculated and the results were discussed.

Selectivity equivalence of poly(ethylene glycol) stationary phases for gas chromatography

2000 ◽  
Vol 898 (2) ◽  
pp. 211-226 ◽  
Author(s):  
Colin F. Poole ◽  
Qinglin Li ◽  
Waruna Kiridena ◽  
Wladyslaw W. Koziol
Keyword(s):  
Gas Chromatography ◽  
Ethylene Glycol ◽  
Stationary Phases ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

The Profile of Payload Release from Gold Nanoparticles Modified with a BODIPY®/PEG Mixed Monolayer

2013 ◽  
Vol 25 ◽  
pp. 16-30 ◽  
Author(s):  
Dhiraj Kumar ◽  
Isha Mutreja ◽  
Brian J. Meenan ◽  
Dorian Dixon
Keyword(s):  
Gold Nanoparticles ◽  
Ethylene Glycol ◽  
Fold Increase ◽  
Average Diameter ◽  
Poly Ethylene Glycol ◽  
Mixed Monolayer ◽  
Agglomeration Effects ◽  
High Concentrations ◽  
Poly Ethylene ◽  
And Diffusion

Gold nanoparticles with an average diameter of ~15.5 nm as measured via TEM were functionalised with various amounts of thiol-terminated 5000MW poly (ethylene glycol) (0-37.75 μg/ml), or with a mixed monolayer of thiol-terminated BODIPY and poly (ethylene glycol) (PEG) in various ratios. BODIPY is a fluorescing molecule which was used here as a model payload, while PEG was added to the surface in order to increase nanoparticle stability and biocompatibility. It was observed that the gold nanoparticle surface saturates with PEG at a loading rate of ~15 wt%. Glutathione (GSH) is an antioxidant that occurs as high concentrations inside cells and this can be used to trigger therapeutic payload release therein. The release of BODIPY from nanoparticles functionalised with a mixed monolayer of PEG and BODIPY was investigated at typical intracellular glutathione concentrations. The release profiles were fitted using zero, first order, Higuchi and Reciprocal Powered Time (RPT) models. It was observed that BODIPY release from the surface of nanoparticles capped only with BODIPY and PEG was best described by the RPT and Higuchi models, suggesting diffusion and diffusion-dissolution controlled release. However, the release profile of the nanoparticles capped only with BODIPY did not fit the expected profile due to agglomeration effects. The ratio of BOBIPY to PEG on the surface had a dramatic effect on the release rate. The predicted time to release 50% of the payload compound from the gold nanoparticles displayed a ~500 fold increase for a mixed monolayer prepared with 0.5-18.75 μg/ml of BODIPY-PEG compared to nanoparticle samples prepared with 1.5-6.25 μg/ml of BODIPY-PEG.

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