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The precipitate was dissolved in 5 ml of chromotropic reagent and vigorously shaken, and the tube was then placed in a boiling water bath for 30 min.
Spectrophotometric determination of sildenafil citrate in pure form and in pharmaceutical formulation using some chromotropic acid azo dyes.
Total amount of P (PO 3--P) in the samples was determined by Molybdate-Vanadate reagent method and N (NO--N) was analyzed by chromotropic acid methods (Kowalenko and Lowe, 1973).
Uptical density was determined at 570 nm after formation of a colored complex of formaldehyde and chromotropic acid.
Method based on reaction of formaldehyde with chromotropic acid and determination of formaldehyde concentration.
9%), chromotropic acid disodium salt dihydrate (99%), methanol (99%), propylene glycol monomethyl ether acetate (96%), 2-n-butoxyethyl acetate (98%), acetic acid (glacial), and ethanol (99%) were purchased from Sigma Aldrich, UK.
The chromotropic acid method was adopted for the analysis of formaldehyde in the rain waters [7].
In past years, traceability of clinical triglyceride measurements was established through participation in the CDC's Lipid Standardization Program (LSP), which standardized triglyceride measurements by the chromotropic acid (CA) RMP as the accuracy base for triglyceride measurements.
Thus the spectral studies prove the chromotropic character of NaHep and the cooperative nature of the dye-polymer interactions in various systems.
The determination of formaldehyde absorbed in distilled water is based on the specific reaction of formaldehyde with a chromotropic acid-sulfuric acid solution, forming a purple monocationic chromogen.
On the other hand, for the second mixture (Irbesartan/ Hydrochlorothiazide mixture), Irbesartan was determined by the first derivative zero crossing technique after extraction with chloroform, while Hydrochlorothiazide was determined by a specific colorimetric method using chromotropic acid.