Colorimetric Determination of Niobium by Molybdenum Blue Method

1954 ◽  
Vol 26 (7) ◽  
pp. 1230-1234 ◽  
Author(s):  
George. Norwitz ◽  
Maurice. Codell
Keyword(s):  
Colorimetric Determination ◽  
Molybdenum Blue

Colorimetric determination of serum 5'-nucleotidase without deproteinization.

1981 ◽  
Vol 27 (3) ◽  
pp. 464-465 ◽  
Author(s):  
R J Wood ◽  
D G Williams
Keyword(s):  
Stannous Chloride ◽  
Protein Precipitation ◽  
Colorimetric Determination ◽  
Molybdenum Blue

Abstract We present a sensitive colorimetric determination of 5'-nucleotidase based on the measurement of liberated phosphate by reaction with stannous chloride/molybdenum blue. No protein precipitation is required. The method is simple, sensitive, economical, and easy to use, and involves relatively stable reagents.

Colorimetric determination of phospholipids by use of molybdophosphate, and its application to amniotic fluid.

1977 ◽  
Vol 23 (11) ◽  
pp. 1995-2000 ◽  
Author(s):  
H G Worth ◽  
D J Wright
Keyword(s):  
Amniotic Fluid ◽  
Present Method ◽  
Biological Fluids ◽  
The Other ◽  
Molar Ratio ◽  
Colorimetric Determination ◽  
Molybdenum Blue ◽  
Present Technique ◽  
Ratio Determination

Abstract We studied the reaction between molybdophosphoric acid and lecithin. The resulting complex was isolated and shown to contain molybdophosphate and lecithin in the molar ratio 1/3. It is insoluble in water but soluble in chloroform, and the reaction is specific for molecules containing electrophilic nitrogen, indicating good specificity in biological fluids for nitrogen-containing phospholipids. In solution the complex may be reduced, yielding molybdenum blue. We applied the reaction to the measurement of phospholipid concentrations in amniotic fluid. As compared with procedures involving either digestion or the determination of lecithin/sphingomyelin ratio, the present technique is faster and its analytical precision exceeds that of the lecithin/sphingomyelin ratio determination. Although results by the three methods do not correlate well, the predictive value of the present method appears to be comparable with the other two.

A Method for the Colorimetric Determination of β-Glucuronidase in Urine, Serum, Tissue; Assay of Enzymatic Activity in Health and Disease

1959 ◽  
Vol 36 (2) ◽  
pp. 193-201 ◽  
Author(s):  
Julius A. Goldbarg ◽  
Esteban P. Pineda ◽  
Benjamin M. Banks ◽  
Alexander M. Rutenburg
Keyword(s):  
Enzymatic Activity ◽  
Colorimetric Determination ◽  
Health And Disease ◽  
Urine Serum

Colorimetric Determination of Fluoride in Drinking Groundwater using a Polymeric Zirconium Complex of 5-(2-Carboxyphenylazo)-8-Hydroxyquinoline

2013 ◽  
Vol 12 (7) ◽  
pp. 460-465
Author(s):  
Sameer Amereih ◽  
Zaher Barghouthi ◽  
Lamees Majjiad
Keyword(s):  
Drinking Water ◽  
Detection Limit ◽  
Complex Formation ◽  
Molar Absorptivity ◽  
Colorimetric Determination ◽  
Zirconium Complex ◽  
Reliable Determination ◽  
Percentage Recovery ◽  
Quantitation Limit

A sensitive colorimetric determination of fluoride in drinking water has been developed using a polymeric zirconium complex of 5-(2-Carboxyphenylazo)-8-Hydroxyquinoline as fluoride reagents. The method allowed a reliable determination of fluoride in range of (0.0-1.5) mg L-1. The molar absorptivity of the complex formation is 7695 ± 27 L mol-1 cm-1 at 460 nm. The sensitivity, detection limit, quantitation limit, and percentage recovery for 1.0 mg L-1 fluoride for the proposed method were found to be 0.353 ± 0.013 μg mL-1, 0.1 mg L-1, 0.3 mg L-1, and 101.7 ± 4.1, respectively.

Colorimetric Determination of Amoxicillin in Pure and some Pharmaceutical Formulations Via Reaction with Potassium Permanganate as Oxidant Reagent

2019 ◽  
Vol 10 (02) ◽  
Author(s):  
Abbas Shebeeb Al-kadumi ◽  
Sahar Rihan Fadhel ◽  
Mohammed Abdullah Ahmed ◽  
Luma Amer Musa
Keyword(s):  
Potassium Permanganate ◽  
Pharmaceutical Preparations ◽  
Pharmaceutical Formulations ◽  
Atomic Emission ◽  
Basic Medium ◽  
Photometric Method ◽  
Colorimetric Determination ◽  
Spectrophotometric Methods ◽  
Label Claim

We proposed two simple, rapid, and convenient spectrophotometric methods are described for the determination of Amoxicillin in bulk and its pharmaceutical preparations. They are based on the measurement of the flame atomic emission of potassium ion (in first method) and colorimetric determination of the green colored solution for manganite ion at 610 nm formed after reaction of Amoxicillin with potassium permanganate as oxidant agent (in the second method) in basic medium. The working conditions of the methods were investigated and optimized. Beer's law plot showed a good correlation in the concentration range of 5-45 μg/ml. The detection limits and relative standared deviations were (2.573, 2.814 μg/ml) (2.137, 2.498) for the flame emission photometric method and (1.844, 2.016 μg/ml) (1.645,1.932) for colorimetric methods for capsules and suspensions respectively. The methods were successfully applied to the determination of Amoxicillin in capsules and suspensions, and the obtained results were in good agreement with the label claim. No interference was observed from the commonly encountered additives and expectancies.

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