2-acrylamido-propane sulphonic acid
(AMPS) and Polyaspartic acid (PASP)-based superabsorbent polymers, which are sensitive to pH and glucose conditions, are being exploited for chronic wound dressing.
Taurine, also known as 2-aminoethanesulfonic acid, is a naturally occurring beta-amino acid (which has a sulphonic acid
group instead of carboxylic acid, differentiating it from other amino acids) yielded by methionine and cysteine metabolism in the liver.
However, RD on Sulphonic acid
is reduced from 20 per cent to 10 per cent.
Prabhakaran, "Investigations on the electrical and structural properties of polyaniline doped with camphor sulphonic acid
," Journal of Physics and Chemistry of Solids, vol.
Chlorogenic acid standard ([greater than or equal to] 95%), 2,2-azino-bis(3-ethylbenzothiazoline-6- sulphonic acid
) (ABTS), 2,2-diphenyl-1-picrylhydrazyl (DPPH), Folin-Ciocalteau reagent, trolox, aluminum chloride, supra-pure nitric acid (65%), and solution of metal standards (1000 ppm) were purchased from Sigma (St.
Phthalic anhydride (PA) and p-toluene sulphonic acid
(pTSA) were procured from Merck, India.
Analytical grade EG, acetic anhydride, pyridine, potassium hydroxide, phenol, tetrachloroethane (TCE), sebacic acid, glycerol, p-toluene sulphonic acid
(p-TSA), zinc acetate (ZnAc), xylene, and methyl ethyl ketone (MEK) were purchased from SD Fine chemicals India and used without any further purification.
Entry Catalyst Solvent Temp ([degrees]C) 1 None Water Reflux 2 None Ethanol Reflux 3 Camphor sulphonic acid
Water Reflux 4 Camphor sulphonic acid
Ethanol Reflux 5 Camphor sulphonic acid
Solvent free 90 6 Boric acid Water Reflux 7 Boric acid Ethanol Reflux 8 Boric acid Solvent free 90 9 Tannic acid Water Reflux 10 Tanic acid Ethanol Reflux 11 Tannic acid Solvent free 90 12 Tannic acid DMF Reflux 13 Tannic acid Toulene Reflux 14 Tannic acid Acetonitrile Reflux Entry Time (min) % Yield (b) 1 180 50 2 180 55 3 180 60 4 180 65 5 180 70 6 180 56 7 180 60 8 180 68 9 180 70 10 180 74 11 45 96 12 180 60 13 180 62 14 180 54 (a) Reaction conditions: benzaldehyde (1 mmol), [beta]-naphthol (1 mmol), dimedone (1 mmol) and 10 mol % catalyst.
Supply of (a) 2,000 tons of sodium silicate in liquid form, also (b) 250 tons sulphonic acid
of 96 % concentration.
Low-cost shampoos and hair dyes contain chemicals including lineralkoil benzene and sulphonic acid
, which are used in carpet manufacturing and car washing products, and PPD chemicals that may cause skin cancer or permanent hair fall and allergy problems.
Different acidic groups such as carboxylic and sulphonic acid
also get converted into their sodium forms which have been shown to promote heavy-metal ion adsorption 36].