Search results for "Propylene Glycol"
showing 7 items of 27 documents
In vitro skin penetration of bronidox, bronopol and formaldehyde from cosmetics
2020
The objective was to evaluate the influence of the formulation in the in vitro transdermal absorption through pig ear skin of three preservatives, bronopol, bronidox and formaldehyde as well as the absorption of formaldehyde from bronopol and dimethyloldimethyl hydantoin (DMDM hydantoin). An aqueous solution, an O/W emulsion and a hydrogel were assayed. Bronidox and bronopol absorption depends on the formulation. The O/W emulsion was the system that least promoted absorption of bronidox while the absorption of bronopol was lower from the hydrogel. The aqueous solution provided maximal transdermal absorption of both preservatives. Moreover, the transdermal absorption of formaldehyde released…
A general concept for the introduction of hydroxamic acids into polymers.
2019
Polyethers (PEG) with hydroxamic acid groups enable chelation of a variety of metal ions, coating of metal oxide surfaces and stabilization of nanoparticles. In contrast to catechol, hydroxamic acids are oxidation stable and biocompatible.
Aliphatic Polyethers: Classical Polymers for the 21st Century.
2015
Polyethers-polymers with the structural element (R'-O-R)n in their backbone--are an old class of polymers which were already used at the time of the ancient Egyptians. However, still today these materials are highly important with applications in all areas of our life, reaching from the automotive and paper industry to cosmetics and biomedical applications. In this Review, different aliphatic polyethers like poly(epoxide)s, poly(oxetane)s, and poly(tetrahydrofuran) are discussed. Special emphasis is placed on the history, the polymerization techniques (industrially and in academia), the properties, the applications as well as recent developments of these materials.
Dynamic evolution of the oscillatory Belousov-Zhabotinsky reaction upon addition of a non-ionic polymer
2006
Abstract The dynamic evolution of the oscillatory Belousov–Zhabotinsky reaction upon addition of increasing amount of the non-ionic polymer polypropylene glycol with molecular weight 425 g mol−1 (PPG-425) was investigated in a stirred-batch reactor by monitoring the Ce(IV) absorbance changes. The oscillatory parameters are significantly altered by the presence of the polymer. The findings obtained in the present work revealed that the PPG-425 is not only more effective, than other polymer previously [R. Lombardo, C. Sbriziolo, M.L. Turco Liveri, K. Pelle, M. Wittmann, Z. Noszticzius, in: J.A. Pojman, Q. Tran-Cong-Miyata (Eds.), Nonlinear Dynamics in Polymeric Systems, American Chemical Soci…
Lichtstreuungsmessungen an oligomeren; lösungsverhalten von polypropylenglykol
1967
Es wird uber Lichtstreuungsmessungen an Polypropylenglykolen mit Molekulargewichten von M = 400 bis 4000, an monomerem und dimerem Propylenglykol, an Diphenyl, Tristearin und Pentaerythrittetrastearat in Losung berichtet. Die molekulareinheitlichen Substanzen dienten zur Untersuchung der Leistungsfahigkeit der Lichtstreuungstechnik im Bereich niedriger Molekulargewichte. Fur den CABANNES-Faktor und das Brechungsinkrement wurde eine Abhangigkeit von Molekulargewicht und Konzentration gefunden. Die Streulichtmessungen an den polymerhomologen Propylenglykolen in Verbindung mit Viskositatsmessungen in Aceton und Benzol wurden zur Charakterisierung des Losungsverhaltens verwendet. Es ergab sich,…
Effect of propylene glycol on pre- and post-partum performance by dairy ewes
2005
This study was carried out in order to determine the effects, after feeding propylene glycol to Valle del Belice ewes 30 days prepartum and 30 days postpartum, on metabolic profiles, body-condition score, milk yield, milk composition, milk clotting ability and the performance of suckling lambs. Ewes were blocked by parity, body-condition score and previous milk production, and assigned randomly to either a control diet or a diet containing propylene glycol fed at the rate of 80 g/ewe/day (low PG) or 160 g/ewe/day (high PG). Feeding propylene glycol prepartum decreased the concentration of BHBA and NEFA and increased the concentration of glucose in the ewes’ plasma. Milk yield from ewes fed …
A fluorescence study of the loading and time stability of doxorubicin in sodium cholate/PEO-PPO-PEO triblock copolymer mixed micelles
2019
Abstract Hypothesis Doxorubicin hydrochloride (DX) is one of the most powerful anticancer agents though its clinical use is impaired by severe undesired side effects. DX encapsulation in nanocarrier systems has been introduced as a mean to reduce its toxicity. Micelles of the nonionic triblock copolymers of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) (PEO-PPO-PEO), are very promising carrier systems. The positive charge of DX confines the drug to the hydrophilic corona region of the micelles. The use of mixed micelles of PEO-PPO-PEO copolymers and a negatively charged bile salt should favour the solubilization of DX in the apolar core region of the micelles. Experiments We st…