scholarly journals A Simple Spectrophotometric Method for the Direct Determination of Uric Acid in Avian Excreta

1983 ◽  
Vol 62 (10) ◽  
pp. 2106-2108 ◽  
Author(s):  
RONALD R. MARQUARDT
Keyword(s):  
Uric Acid ◽  
Spectrophotometric Method ◽  
Direct Determination ◽  
Avian Excreta

Direct Determination of Uric Acid Based on Pd Nanoparticles Electrodepositing onto Anatase-Type TiO2Nanoparticles/Chitsan Film-Modified Electrode

2008 ◽  
Vol 41 (15) ◽  
pp. 2860-2876 ◽  
Author(s):  
Lin Tan ◽  
Guang-Ming Yang ◽  
Ping Wang ◽  
Zong-Yuan Xie ◽  
Hui-Ping Bai ◽  
...  
Keyword(s):  
Uric Acid ◽  
Modified Electrode ◽  
Direct Determination ◽  
Pd Nanoparticles

The determination of uric acid, particularly in avian excreta

The Analyst ◽  
1957 ◽  
Vol 82 (971) ◽  
pp. 110 ◽  
Author(s):  
Joseph Tinsley ◽  
T. Z. Nowakowski
Keyword(s):  
Uric Acid ◽  
Avian Excreta

Spectrophotometric Method for the Direct Determination of Available Phosphorus in Fertilizers: Use of Dry Ashing to Destroy Citrate

1965 ◽  
Vol 48 (4) ◽  
pp. 859-865
Author(s):  
Wallace S Brammell
Keyword(s):  
Spectrophotometric Method ◽  
Direct Determination ◽  
Available Phosphorus ◽  
Hot Plate ◽  
Erlenmeyer Flask ◽  
White Ash ◽  
Heat Stable ◽  
Dry Ashing ◽  
Acid Reagent

Abstract A simple, rapid spectrophotometry method has been developed for direct determination of available phosphorus in fertilizers. Citrate and other organic materials are destroyed by dry ashing. The combined water and citrate extracts are diluted, a 5 ml aliquot is pipetted into a 25 ml Erlenmeyer flask, and 2 ml of ashing reagent (dilute HNO3, sucrose, and MgO) is added. During evaporation to dryness on a hot plate, nonorthophosphates are hydrolyzed to orthophosphates which react with Mg to form heat-stable compounds. During the subsequent ashing, phosphorus remains in the ortho form. Due to sucrose, the dry residue has a very porous structure and can be converted to a white ash in about 30 minutes in a pre-heated 550°C muffle. Color is developed with vanadomolybdic acid reagent. Absorbance is read on a spectrophotometer at 400 mμ.

Spectrophotometric method for the direct determination of uranium in carbonate solution

1985 ◽  
Vol 86 (3-4) ◽  
pp. 187-193 ◽  
Author(s):  
I. Brčić ◽  
E. Polla ◽  
M. Radošević
Keyword(s):  
Spectrophotometric Method ◽  
Direct Determination ◽  
Carbonate Solution

Nonenzymatic stopped-flow fluorimetric method for direct determination of uric acid in serum and urine.

1989 ◽  
Vol 35 (2) ◽  
pp. 230-233 ◽  
Author(s):  
D Pérez-Bendito ◽  
A Gómez-Hens ◽  
M C Gutiérrez ◽  
S Antón
Keyword(s):  
Hydrogen Peroxide ◽  
Uric Acid ◽  
Direct Determination ◽  
Urine Samples ◽  
Stopped Flow ◽  
Fluorimetric Determination ◽  
Kinetic Measurements ◽  
Serum And Urine ◽  
Serum And Urine Samples

Abstract A simple, direct, sensitive, and selective stopped-flow method for the fluorimetric determination of uric acid in serum and urine samples is described. The variation of fluorescence intensity during the reaction between uric acid and 1,1,3-tricyano-2-amino-1-propene (triap) in the presence of hydrogen peroxide is monitored. For these kinetic measurements peroxide is monitored. For these kinetic measurements we used a versatile stopped-flow module that can be fitted to any fluorimeter. The linear range of the proposed method is 0.08-3.00 mg of uric acid per liter, and the detection limit is 0.03 mg/L. Within- and between-assay CVs and selectivity data are reported. Results for serum and urine samples correlated well with those obtained by the uricase method The proposed method is inexpensive and requires no sophisticated detection equipment.

A Modification of the Spectrophotometric Determination of Carbon Monoxide in Blood Enabling Direct Determination of Per Cent Hemoglobin Saturation

1959 ◽  
Vol 5 (2) ◽  
pp. 127-134 ◽  
Author(s):  
Hans Berninger ◽  
Roger Smith
Keyword(s):  
Carbon Monoxide ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Experimental Error ◽  
Direct Determination ◽  
Hemoglobin Saturation

Abstract A modification of the spectrophotometric method for the determination of carbon monoxide in blood has been presented that enables direct determination of per cent hemoglobin saturation with an overall experimental error of 3 per cent.

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