Simultaneous determination of active ingredients in an ophthalmic solution by isocratic tandem-mode HPLC connected reverse phase column and strong cation exchange column

2006 ◽  
Vol 40 (2) ◽  
pp. 331-337 ◽  
Author(s):  
Takahiro Marunouchi ◽  
Masaki Ono ◽  
Toshiaki Nakajima ◽  
Yuji Ito ◽  
Takao Aketo
Keyword(s):  
Cation Exchange ◽  
Simultaneous Determination ◽  
Ophthalmic Solution ◽  
Active Ingredients ◽  
Reverse Phase ◽  
Exchange Column ◽  
Strong Cation Exchange ◽  
Cation Exchange Column ◽  
Phase Column

Determination of haemoglobin A1c by liquid chromatography using a new cation-exchange column

2003 ◽  
Vol 791 (1-2) ◽  
pp. 73-83 ◽  
Author(s):  
Maria Beatriz de la Calle Guntiñas ◽  
René Wissiack ◽  
Guy Bordin ◽  
Adela Rosa Rodrı́guez
Keyword(s):  
Liquid Chromatography ◽  
Cation Exchange ◽  
Haemoglobin A1c ◽  
Exchange Column ◽  
Cation Exchange Column

ANALYSIS FOR SMALL AMOUNTS OF CALCIUM, MAGNESIUM, BARIUM, AND SULPHATE USING PHTHALEIN PURPLE

1956 ◽  
Vol 34 (7) ◽  
pp. 921-925 ◽  
Author(s):  
J. R. McCallum
Keyword(s):  
Cation Exchange ◽  
Distilled Water ◽  
Complexometric Method ◽  
Exchange Column ◽  
Cation Exchange Column ◽  
Calcium Magnesium

For the determination of sulphate ion in samples containing 3 to 20 mgm., it was found that the standard precipitation techniques did not give sufficiently accurate results, and were time consuming. Reference to the literature showed that with certain modifications a complexometric method proposed by Schwarzenbach etal. for samples containing 20 to 50 mgm. of sulphate was most likely to give accurate results rapidly. In this method the sample is passed through a cation exchange column and washed with distilled water into a flask. This solution is boiled and precipitated with excess standard disodium ethylenediaminetetracetate in the presence of alcohol and ammonia using phthalein purple indicator. Provided that the details of procedure described in this paper are closely adhered to, accuracy is usually within two per cent. Calcium, magnesium, and barium may also be titrated directly using the phthalein purple indicator.

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