Design and Preparation of a Bioresponsive Hydrogel for Biomedical Application as a Wound Dressing

2008 ◽  
Vol 55-57 ◽  
pp. 681-684 ◽  
Author(s):  
C. Witthayaprapakorn ◽  
Robert Molloy ◽  
K. Nalampang ◽  
B.J. Tighe
Keyword(s):  
Aqueous Solution ◽  
Wound Dressing ◽  
Biomedical Application ◽  
Transmission Rate ◽  
Crosslinking Agent ◽  
Sheet Thickness ◽  
Ambient Air ◽  
Water Soluble ◽  
Parallel Plates ◽  
Good Transparency

In this work, the sodium salt of 2-acrylamido-2-methylpropanesulfonic acid (Na-AMPS) was photopolymerised in aqueous solution with ethylene glycol dimethacrylate (EGDM) added as a crosslinking agent and 4,4'-azo-bis(4-cyanopentanoic acid) as the water-soluble photoinitiator. The aqueous solution was poured into a vertical sheet-forming mould consisting of two parallel plates covered with Teflon® sheets as release liners. Spacers were used to control the sheet thickness with a polymer mesh inserted in the middle to strengthen the hydrogel. The hydrogel sheets obtained were of 1.2 ± 0.2 mm thickness and showed good transparency, flexibility and skin adhesion. On immersion in distilled water at 37°C, it was found that the equilibrium water content (EWC) reached 98 ± 1% within 20 mins following which the equilibrium water retention (EWR) in ambient air was 21 ± 1% over a period of about 4 hrs. The water vapour transmission rate (WVTR) was measured at 37 °C and was found to be 82 ± 2 g m-2 hr-1. It is concluded that this Na-AMPS hydrogel sheet has properties which show potential for biomedical use as a wound dressing.

Novel nanocomposite hydrogel for wound dressing and other medical applications

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 103036-103046 ◽  
Author(s):  
Ali Hebeish ◽  
S. Sharaf
Keyword(s):  
Carboxymethyl Cellulose ◽  
Wound Dressing ◽  
Graft Copolymerization ◽  
Crosslinking Agent ◽  
Water Soluble ◽  
Medical Applications ◽  
Nanocomposite Hydrogel ◽  
Hydrogel Nanocomposites

Graft copolymerization of DADMAC with a MBA crosslinking agent was achieved on water soluble carboxymethyl cellulose with an APS initiator. A CuO nanocomposite hydrogel was formed in situ on cotton. The synthesis of Ag/CMC-DADMAC hydrogel nanocomposites was also studied.

Investigation of Dialdehyde Corn Starch as Crosslinking Agent in Collagen-Based Wound Dressing Materials

2016 ◽  
Author(s):  
Cigdem Kilicarislan Ozkan ◽  
Hasan Ozgunay ◽  
Stefania Marin ◽  
Madalina Georgiana Albu Kaya
Keyword(s):  
Wound Dressing ◽  
Corn Starch ◽  
Crosslinking Agent ◽  
Dressing Materials ◽  
Wound Dressing Materials

Enantioselective Recognition of Chiral Guests by the Water-Soluble Chiral Keplerate {Mo132} Spherical Capsule with 30 Inner Lactate Ligands

2019 ◽  
Author(s):  
Nancy Watfa ◽  
Weimin Xuan ◽  
Zoe Sinclair ◽  
Robert Pow ◽  
Yousef Abul-Haija ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Chiral Recognition ◽  
Association Constants ◽  
Water Soluble ◽  
Enantioselective Recognition ◽  
H Nmr ◽  
Dosy Nmr ◽  
Spherical Capsule ◽  
Surface Pores ◽  
Guest Chemistry

Investigations of chiral host guest chemistry are important to explore recognition in confined environments. Here, by synthesizing water-soluble chiral porous nanocapsule based on the inorganic metal-oxo Keplerate-type cluster, {Mo<sub>132</sub>} with chiral lactate ligands with the composition [Mo<sub>132</sub>O<sub>372</sub>(H<sub>2</sub>O)<sub>72</sub>(<i>x-</i>Lactate)<sub>30</sub>]<sup>42-</sup> (<i>x</i> = D or L), it was possible to study the interaction with a chiral guest, L/D-carnitine and (<i>R</i>/<i>S</i>)-2-butanol in aqueous solution. The enantioselective recognition was studied by quantitative <sup>1</sup>H NMR and <sup>1</sup>H DOSY NMR which highlighted that the chiral recognition is regulated by two distinct sites. Differences in the association constants (K) of L- and D-carnitine, which, due to their charge, are generally restricted from entering the interior of the host, are observed, indicating that their recognition predominantly occurs at the surface pores of the structure. Conversely, a larger difference in association constants (K<i><sub>S</sub></i>/K<i><sub>R</sub></i> = 3) is observed for recognition within the capsule interior of (<i>R</i>)- and (<i>S</i>)-2-butanol.

scholarly journals Sulfobetaine Cryogels for Preferential Adsorption of Methyl Orange from Mixed Dye Solutions

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 208
Author(s):  
Ramona B. J. Ihlenburg ◽  
Anne-Catherine Lehnen ◽  
Joachim Koetz ◽  
Andreas Taubert
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Methyl Orange ◽  
Dye Removal ◽  
Selective Adsorption ◽  
Water Soluble ◽  
Organic Substances ◽  
Preferential Adsorption ◽  
Dimethyl Ammonium ◽  
Dye Solutions

New cryogels for selective dye removal from aqueous solution were prepared by free radical polymerization from the highly water-soluble crosslinker N,N,N’,N’-tetramethyl-N,N’-bis(2-ethylmethacrylate)-propyl-1,3-diammonium dibromide and the sulfobetaine monomer 2-(N-3-sulfopropyl-N,N-dimethyl ammonium)ethyl methacrylate. The resulting white and opaque cryogels have micrometer sized pores with a smaller substructure. They adsorb methyl orange (MO) but not methylene blue (MB) from aqueous solution. Mixtures of MO and MB can be separated through selective adsorption of the MO to the cryogels while the MB remains in solution. The resulting cryogels are thus candidates for the removal of hazardous organic substances, as exemplified by MO and MB, from water. Clearly, it is possible that the cryogels are also potentially interesting for removal of other compounds such as pharmaceuticals or pesticides, but this must be investigated further.

Biosynthesis of Carboxymethylated Bacterial Cellulose Composite for Wound Dressing

2011 ◽  
Vol 685 ◽  
pp. 322-326 ◽  
Author(s):  
Jun Wei Yu ◽  
Xiao Li Liu ◽  
Chang Sheng Liu ◽  
Dong Ping Sun
Keyword(s):  
Bacterial Cellulose ◽  
Wound Dressing ◽  
Culture Medium ◽  
Acetobacter Xylinum ◽  
Water Holding Capacity ◽  
Water Soluble ◽  
Transmission Rates ◽  
Measurement Results ◽  
Water Holding ◽  
Cellulose Composite

A novel bacterial cellulose (BC) composite (carboxymethylated-bacterial cellulose, CM-BC) was synthesized by Acetobacter xylinum by adding water-soluble carboxymethylated cellulose (CMC) in the culture medium. FTIR results showed that CM-BC is obtained by the incorporation of CMC in the network of BC. Water-holding capacity and water vapor transmission rates (WVTR) of CM-BC and BC are determined. The WVTR of CM-BC is comparable to that of BC, but the water-holding capacity of CM-BC is improved compared with BC. Tensile strengths measurement results showed that the fracture stress of CM-BC is higher than that of BC, indicating that CM-BC have more potential wound dressing applications than BC.

Cationic (Basic) dye complex pigments

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Robert Christie ◽  
Adrian Abel
Keyword(s):  
Water Soluble ◽  
Cationic Dye ◽  
Color Strength ◽  
Organic Pigments ◽  
Basic Dye ◽  
Copper Ferrocyanide ◽  
Printing Inks ◽  
Good Transparency ◽  
Printing Ink

Abstract Cationic (or basic) dye complex pigments are classical organic pigments obtained from water-soluble cationic dyes for textiles, mainly of triarylmethine (arylcarbonium ion) types, which are precipitated using large inorganic counterions, especially those derived from heteropolyacids such as phosphotungstomolybdic acid or, to a certain extent, using the counteranion derived from copper ferrocyanide. This range of pigments includes red, violet, blue and green products, offering brilliant shades, high color strength and good transparency. They are well suited to printing ink applications, although they provide only moderate levels of fastness properties. The pigments are synthesized by treating aqueous solutions of the dyes under highly controlled conditions with solutions of the heteropolyacids, prepared in situ. The copper ferrocyanide salts are obtained by treatment of potassium ferrocyanide with sodium sulfite in water, and subsequently with solutions of the cationic dye and copper (II) sulfate. The pigments are primarily used in inks for packaging and advertising materials. However, they have little use outside printing inks. Reflex or alkali blue pigments are structurally related cationic dye derivatives which are inner salts of the dye structures and are also used in printing inks.

scholarly journals DUST FALL RATE AND ITS COMPOSITION IN CHANDRAPUR INDUSTRIAL CLUSTER, CENTRAL INDIA

2015 ◽  
Vol 4 (3) ◽  
pp. 96-110 ◽  
Author(s):  
R. K. Kamble
Keyword(s):  
Central India ◽  
Sampling Period ◽  
Industrial Cluster ◽  
Ambient Air ◽  
Industrial Area ◽  
Residential Area ◽  
Water Soluble ◽  
Fall Rate ◽  
Dust Fall ◽  
Sampling Locations

  Dust is one of the significant air pollutants in ambient air of Chandrapur industrial cluster. A study was carried out to ascertain the dust fall rate in four sampling locations in the Chandrapur industrial cluster of Chandrapur district, central India. The sampling was carried out by dust fall jar method in winter season (2014-2015) and dust fall rate was estimated gravimetrically. Maximum dust fall rate was recorded in Nakoda 246.67 MT sq km-1 month-1 (industrial area, downwind direction), followed by CSTPS colony 171.77 MT sq km-1 month-1 (industrial area, downwind direction) whereas minimum concentration was found in Babupeath 55.54 MT sq km-1 month-1 (residential area, downwind direction) for December-January. Whereas, during sampling period of February-March maximum dust fall rate was observed to be 278.14 MT sq km-1 month-1 at Babupeath (residential area, upwind direction) and minimum dust fall rate was observed at Ballarpur 173.74 MT sq km-1 month-1 (industrial, upwind direction). The results indicated that dust fall rate for the sampling period of December-January in industrial cluster region was higher as compared with residential region. It has been also observed that upwind direction sampling locations had lesser dust fall rate as compared with downwind direction. The composition of dust fall from study area was dominated by water soluble components. Water insoluble components were comprised of inorganic insoluble and volatile matter. Total inorganic component per cent by weight was maximum in dust.International Journal of Environment Volume-4, Issue-3, June-August 2015Page: 96-110

scholarly journals Blinking and nonradiant dark fraction of water-soluble quantum dots in aqueous solution

2005 ◽  
Vol 102 (40) ◽  
pp. 14284-14289 ◽  
Author(s):  
J. Yao ◽  
D. R. Larson ◽  
H. D. Vishwasrao ◽  
W. R. Zipfel ◽  
W. W. Webb
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Water Soluble
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