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Topic: Anionic


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In the News (Wed 22 May 19)

  
  D1681-92(1997) Standard Test Method for Synthetic Anionic Active Ingredient in Detergents by Cationic Titration ...
1.1 Direct titration of an anionic surfactant with a standardized cationic reagent is a simple and convenient method for the quantitative determination of the content of active ingredient.
The relationship between anionic and cationic agents is not always stoichiometric, and for maximum accuracy the anionic type of interest should first be characterized and then used to standardize the cationic reagent.
The anionic surfactants characterized in accordance with Sections 16 to 22 should be the sodium salt and not amine, ammonium, or potassium salts.
www.astm.org /DATABASE.CART/HISTORICAL/D1681-92R97.htm   (387 words)

  
 CiteULike: Effect of anionic polymers on the release of propranolol hydrochloride from matrix tablets
Anionic polymers, namely Eudragit S, Eudragit L 100-55, and sodium carboxymethylcellulose, were incorporated into hydroxypropylmethylcellulose (HPMC K100M) to modify the drug release from HPMC matrices.
The effects of changing the ratio of HPMC to anionic polymers were examined in water and in media with different pH.
The drug release was controlled with the type of anionic polymer and the interaction between propranolol hydrochloride and anionic polymers.
www.citeulike.org /user/diego_gallardo/article/490695   (371 words)

  
  Anionic
For example, the chloride ion Cl- is anionic.
Though there are an equal number of positive and negative ions in the sample as a whole, the net negative surface of an anionic particle is balanced by counter-ions in solution.
The words "double-layer" are used to describe the distribution of counter-ions adjacent to a charged surface.
www4.ncsu.edu /~hubbe/Defnitns/Anionic.htm   (166 words)

  
  Anionic polymer products and processes - Patent 6221956
An anionic aqueous dispersion of a water-soluble or water-swellable polymer having a pH greater than 4 and an anionic content of greater than 15 mole percent would be desirable because these dispersions are generally utilized by admixing with water to disperse or dissolve the polymer, then utilizing the resulting diluted admixture in the desired application.
The effective level of insolubilizing anionic recurring unit is generally found by routine experimentation, and may be chosen in concert with the choice of total anionic charge in the polymer and salt level in the aqueous dispersion.
The anionic charge of the anionic polymer that is contained in the aqueous dispersions of the instant invention may result from a combination of anionic monomer polymerization and post-reaction.
www.freepatentsonline.com /6221956.html   (12867 words)

  
 Anionic Tensides in Powdered Laundry Detergent
Anionic tensides react with cationic dyes such as methylene blue under formation of an ion pair which is transfered into the organic phase (ethylacetate).
The anionic detergent complexes with methylene blue in alkaline solution to produce a blue complex which is extracted into chloroform.
Anionic tensides consist of two functional groups: a polar, hydrophilic "head" (carboxylate group) and a non-polar, hydrophobic "tail" (hydrocarbon chain).
www.uni-regensburg.de /Fakultaeten/nat_Fak_IV/Organische_Chemie/Didaktik/Keusch/D-Tenside_anionisch-e.htm   (413 words)

  
 KCPC Education Resource Web Site: 9.5.5 - Anionic Surfactants
Other commonly used anionic surfactants are the alkyl benzenesulfonates, alkyl sulfonates and the alkyl phosphates.
Anionic surfactants are used all over the place.
Anionic surfactants are generally avoided in cosmetic products, but their use in shampoos and other products can still lead to irritation (that's why some people suggest changing shampoos every month or so).
www.kcpc.usyd.edu.au /discovery/9.5.5-short/9.5.5_anionic.html   (353 words)

  
 Anionic Liposomal Delivery System for DNA Transfection
Anionic liposomes have been previously used as models to simulate the cell surface to study non–receptor-mediated transport of DNA across cells.
Interaction of endosomal membrane anionic lipids with the cationic lipoplexes through formation of ion pairs, lateral diffusion, and lipid mixing are some of the mechanisms speculated to facilitate the DNA and lipoplex release.
In the case of anionic lipoplexes, upon endosomal compartmentalization, the formation of lipid ion pairs that promote release of the lipoplex is impossible because lipid populations in both the endosomal membrane lipids and those in the anionic lipoplex have negative charges.
www.aapspharmsci.org /view.asp?art=aapsj060429   (4140 words)

  
 Isotropic liquids incorporating anionic polymers which are not hydrophobically modified - Patent 5962398   (Site not responding. Last check: )
Anionic surface active agents which may be used in the present invention are those surface active compounds which contain a long chain hydrocarbon hydrophobic group in their molecular structure and a hydrophilic group, i.e.
One of the preferred groups of anionic surface active agents are the alkali metal, ammonium or alkanolamine salts of higher alkyl aryl sulfonates and alkali metal, ammonium or alkanolamine salts of higher alkyl sulfates.
Examples of synthetic anionic polymers are polyacrylic acid units in its partially and fully ionized forms, polyethylene sulfonic acid in its partially and fully ionized forms, poly(methacrylic acid) in its partially and fully ionized forms, poly(phosphoric acid) and its salts, poly(vinylsulfuric acid) and poly(vinyl alcohol-co-vinyl sulfuric acid) and their salts.
www.freepatentsonline.com /5962398.html   (6307 words)

  
 A Monoclonal Antibody that Binds Anionic Phospholipids on Tumor Blood Vessels Enhances the Antitumor Effect of ...
anionic phospholipids on the vascular endothelium in tumors
anionic phospholipids, was raised in this laboratory and characterized
Increased exposure of anionic phospholipids on the surface of tumor blood vessels.
cancerres.aacrjournals.org /cgi/content/full/65/10/4408   (6230 words)

  
 Chem 421 - Anionic Polymerization
The mechanism of anionic polymerization is a kind of repetitive conjugate addition reaction (the "Michael reaction" in organic chemistry).
Acrylates have problems in anionic propagation because of chain transfer to polymer.
The new anionic species is too weak to reinitiate.
chem.chem.rochester.edu /~chem421/anionic.htm   (1176 words)

  
 Palatable anionic feed mineral concentrate (US6120815)
The attrition resistant granular concentrate composition may be effectively blended with animal feeds to form storage stable feed rations for commercial breeding animals for preventing parturient paresis.
A four step method of preparing anionic mineral feed concentrate granules, which form storage stable blends with feed rations, for prevention of parturient paresis in commercial breeding animals, the method comprising;
(b) admixing 1 part of the anionic salt solution with between 1 and 4 parts of comestible proteinaceous particles until the anionic salt solution is absorbed to form damp particles exhibiting moisture contents between 15 and 30 percent;
www.delphion.com /details?pn=US06120815__   (254 words)

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