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
Method based on reaction of formaldehyde with chromotropic
acid and determination of formaldehyde concentration.
Cholesterol, chloroform, chromotropic
acid, sodium arsenite, and calcium chloride were purchased from Merck, Germany.
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.
acid method was adopted for the analysis of formaldehyde in the rain waters .
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