Ion Exchange Method for Rapid Determination of Alkalinity of Water-Soluble Tea Ash Containing High Levels of Manganese

1980 ◽  
Vol 63 (3) ◽  
pp. 460-461
Author(s):  
Saidul Z Qureshi ◽  
Fadhil M Najib ◽  
Fahmi A Mohammed
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Rapid Determination ◽  
Cation Exchange Resin ◽  
Water Soluble ◽  
Exchange Method ◽  
Strong Cation Exchange ◽  
Ion Exchange Method

Abstract An ion exchange method to determine the alkalinity of water-soluble tea ash containing high levels of manganese is described. A chromatographic column containing a strong cation exchange resin (20–50 mesh) in Na+ form, with a bed volume of 5 mL is used. The present ion exchange method is compared to pH titrations and also to the official AOAC methods (31.012, 31.015, 31.016). Results with the new method are accurate and precise.

Ion Exchange Method for Phenylpropanolamine Hydrochloride in an Elixir

1970 ◽  
Vol 53 (1) ◽  
pp. 116-117
Author(s):  
Donald J Smith
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Positive Charge ◽  
Exchange Resin ◽  
Collaborative Study ◽  
Cation Exchange Resin ◽  
Sulfonated Polystyrene ◽  
Exchange Method ◽  
Phenylpropanolamine Hydrochloride ◽  
Ion Exchange Method

Abstract Phenylpropanolamine is retained on a sulfonated polystyrene cation exchange resin by the positive charge located in the cationic center of the molecule. Phenylpropanolamine hydrochloride is eluted from the column with 0.27N HCl and determined by UV absorption. Duplicate recoveries were 101 and 101%. The method is recommended for collaborative study.

Collaborative Study and Ion Exchange Method for the Determination of Methyldopa, Chlorothiazide, and Hydrochlorothiazide in Drug Mixtures

1971 ◽  
Vol 54 (3) ◽  
pp. 603-608
Author(s):  
Rod Chu
Keyword(s):  
Standard Deviation ◽  
Ion Exchange ◽  
Exchange Resin ◽  
Collaborative Study ◽  
Cation Exchange Resin ◽  
Resin Column ◽  
Exchange Method ◽  
Average Recovery ◽  
Ion Exchange Method

Abstract A method for the assay of methyldopa with either chlorothiazide or hydrochlorothiazide was studied collaboratively by 8 laboratories. The method involves the use of AG50-4X, 100-200 mesh H+ cation exchange resin to resolve the compounds. The thiazides pass freely through the resin column, while methyldopa is retained and subsequently eluted with 1N methanolic HCl. The components are quantitatively measured by spectrophotometry at 280 (methyldopa), 277 (chlorothiazide), and 270 nm (hydrochlorothiazide). For the methyldopa-chlorothiazide combination, the overall average recovery for methyldopa was 98.5% with a standard deviation of 2.50; and for the methyldopa-hydrochlorothiazide combination, 96.4% with a standard deviation of 2.30. The average recoveries for chlorothiazide and hydrochlorothiazide were 99.6 (standard deviation of 1.14) and 98.8% (standard deviation of 2.92), respectively. The method has been adopted as official first action for the determination of methyldopa and chlorothiazide in combination.

Collaborative Study of an Ion Exchange Method for Ephedrine in Ephedrine Sulfate Sirup NF

1969 ◽  
Vol 52 (4) ◽  
pp. 854-857
Author(s):  
Donald J Smith
Keyword(s):  
Hydrochloric Acid ◽  
Ion Exchange ◽  
Positive Charge ◽  
Exchange Resin ◽  
Collaborative Study ◽  
Cation Exchange Resin ◽  
Polystyrene Sulfonate ◽  
Resin Column ◽  
Exchange Method ◽  
Ion Exchange Method

Abstract An ion exchange procedure for Ephedrine Sulfate Sirup NF, based on the ability of ephedrine to be retained on a polystyrene sulfonate cation exchange resin column, was studied collaboratively by eight laboratories. The compound is held on the column by a positive charge located in the cationic center of the molecule, it is then eluted with hydrochloric acid, and its ultraviolet absorption is measured. The addition of 57.88 mg ephedrine sulfate to Ephedrine Sulfate Sirup NF resulted in recoveries of 58.39 and 57.72 mg, or 101 and 100%, respectively. Recoveries for collaborative samples, each containing 19.22 and 19.33 mg/5 ml, were 99.8 ± 1.83 and 101 ± 4.09%, respectively.

Rapid Determination of Plasma Ammonia by an Ion-Exchange Technic

1964 ◽  
Vol 10 (6) ◽  
pp. 497-508 ◽  
Author(s):  
Donald T Forman
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Rapid Determination ◽  
Cation Exchange Resin ◽  
Great Sensitivity ◽  
Ammonium Ion ◽  
Colorimetric Determination ◽  
Experimental Conditions ◽  
Colorimetric Procedure

Abstract A method is described for the colorimetric determination of ammonia in plasma by a batch ion-exchange procedure. The method combines separation of ammonium ion, using a strongly acidic cation-exchange resin, with a sensitive colorimetric procedure which simultaneously elutes and colorimetrically reacts with the ammonium ion to produce a stable color. Interference by basic amino acids is negligible, and the great sensitivity of the color reaction permits the measurement of ammonia of the order of 0.5 µg./ml. The effects of variations in the experimental conditions are examined, and the results of recovery experiments and other tests of precision and accuracy are reported. In comparison with other methods in current use, this method has distinct advantages in sensitivity, simplicity, and rapidity of determination, provided the conditions and methods of measurement are controlled carefully.

Determination of formaldehyde in fruit juice based on magnetic strong cation-exchange resin modified with 2,4-dinitrophenylhydrazine

2012 ◽  
Vol 131 (1) ◽  
pp. 380-385 ◽  
Author(s):  
Hui Wang ◽  
Jie Ding ◽  
Xiaobo Du ◽  
Xin Sun ◽  
Ligang Chen ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Fruit Juice ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Strong Cation Exchange

The non-protein nitrogen composition of grass silages: I. The estimation of the basic amino acids and non-volatile amines by chromatography on a weak cation exchange resin

1969 ◽  
Vol 72 (3) ◽  
pp. 459-466 ◽  
Author(s):  
A. D. Hughes
Keyword(s):  
Amino Acids ◽  
Ion Exchange ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Protein Nitrogen ◽  
Weak Cation Exchange

SUMMARYInvestigations into the non-protein nitrogen composition of grass silages using the 50 cm strong cation-exchange column of Spackman, Stein & Moore (1958) to determine the basic amino acids led to difficulties in the determination of ethanolamine in the presence of high concentrations of ammonia, and of histidine in the presence of δ amino-n-valeric acid. An alternative technique for the ion exchange chromatography and estimation of histidine, lysine, ornithine, ethanolamine, arginine and ammonia on a weak cation-exchange resin has been developed. This method enables small amounts of ethanolamine to be determined in the presence of large amounts of ammonia and values for the ethanolamine content of a number of silage samples are presented. When used in conjunction with the technique of Spackman et al. (1958) the δ-amino-n-valeric acid content of grass silages could also be determined in the presence of histidine.The estimation of amines produced by the microbial decomposition of herbage proteins during ensiling has previously involved their initial separation from the amino acids followed by quantitative partition chromatography. An alternative method for the estimation of these amines by ion-exchange chromatography on a weak cation-exchange resin is described. This method permits the colorimetric determination of β-phenylethylamine, tyramine, tryptamine, 5-hydroxytryptamine, putrescine, cadaverine and histamine without interference from the amino acids. The efficiency of this technique has been investigated using standard solutions of the naturally occurring amines and samples of good quality and of high pH spoilt silages.

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