A Novel and Efficient Colorimetric Assay for Quantitative Determination of Amlodipine in Environmental, Biological and Pharmaceutical Samples

2019 ◽  
Vol 4 (34) ◽  
pp. 10046-10053 ◽  
Author(s):  
Sana Yaqoob ◽  
Sana Rahim ◽  
Adnan Murad Bhayo ◽  
Muhammad Raza Shah ◽  
Abdul Hameed ◽  
...  
Keyword(s):  
Quantitative Determination ◽  
Colorimetric Assay ◽  
Pharmaceutical Samples

Simple Colorimetric Estimation of Cyclopiazonic Acid in Contaminated Food and Feeds

1984 ◽  
Vol 67 (1) ◽  
pp. 38-40
Author(s):  
A Rathinavelu ◽  
Edayathimangalam Rajabhavani B Shanmugasundaram
Keyword(s):  
Thin Layer ◽  
Quantitative Determination ◽  
Thin Layer Chromatography ◽  
Minimal Medium ◽  
Colorimetric Assay ◽  
Cyclopiazonic Acid ◽  
Assay Procedure ◽  
Contaminated Food ◽  
Layer Chromatography

Abstract A method has been developed for quantitative determination of cyclopiazonic acid, a mycotoxin produced by a common food contaminant, Penicillium cyclopium. The organism was grown successively in synthetic minimal medium, rice, corn, and wheat for 15 days. The toxin was extracted with chloroform followed by separation by thin layer chromatography. A colorimetric assay procedure has been successfully developed for the analysis of cyclopiazonic acid present in infected rice, corn, and wheat. The sensitivity of the method was tested by using recovery experiments.

scholarly journals A new method for the quantitative determination of monosaccharides, amino sugars and N-acetylneuraminic acid and of 6-deoxyhexose (fucose) in the presence of other sugars

1968 ◽  
Vol 110 (3) ◽  
pp. 413-417 ◽  
Author(s):  
Gwyneth M. Brearley ◽  
Jacqueline B. Weiss
Keyword(s):  
Quantitative Determination ◽  
Colorimetric Assay ◽  
Periodate Oxidation ◽  
New Method ◽  
Amino Sugars ◽  
Simple Method ◽  
Acetylneuraminic Acid ◽  
Assay Procedure ◽  
Optimum Ph

1. Monosaccharides, amino sugars and N-acetylneuraminic acid were determined by using an original colorimetric assay procedure, based on the detection of formaldehyde released after periodate oxidation. A range of these compounds was investigated by this method and they were all found to obey Beer's law within the concentration range 0–0·6μmole/ml. 2. A simple method for the determination of 6-deoxyhexose concentration in the presence of other monosaccharides is also described. 3. The optimum pH for the release of formaldehyde from sugars by periodate oxidation was 7·0–7·5. 4. The methods described have considerable advantages over existing assay systems and their particlar value in automatic colorimetry, where the use of concentrated acids is undesirable, is discussed.

Rapid colorimetric assay for acetaminophen without salicylate or phenylephrine interference.

1982 ◽  
Vol 28 (5) ◽  
pp. 1171-1173 ◽  
Author(s):  
M B Swanson ◽  
M I Walters
Keyword(s):  
High Pressure ◽  
Liquid Chromatography ◽  
Quantitative Determination ◽  
High Pressure Liquid Chromatography ◽  
Sulfonic Acid ◽  
Colorimetric Assay ◽  
Colored Complex

Abstract A simple rapid, and economical procedure is presented for the quantitative determination of acetaminophen in serum. Acetaminophen is extracted into solvent, and, when back-extracted into base, is simultaneously reacted with Folin-Ciocalteau reagent to form a colored complex. The potential interference of bilirubin is eliminated by treatment with p-diazobenzene sulfonic acid. Results obtained with this method agree with those obtained by "high-pressure" liquid chromatography.

Fabrication of TiO2-Carbon Paste Modified Electrochemical Sensor for 4-Aminophenol in Pharmaceutical Samples

2016 ◽  
Vol 32 (1-2) ◽  
pp. 58 ◽  
Author(s):  
Gidey Bahre ◽  
Tadele Hunde ◽  
Mekonen Tirfu ◽  
Rishi Pal ◽  
R. C. Saini
Keyword(s):  
Quantitative Determination ◽  
Limit Of Detection ◽  
Modified Carbon Paste Electrode ◽  
Neutral Medium ◽  
Carbon Paste ◽  
Peak Current ◽  
Pharmaceutical Samples ◽  
Square Wave ◽  
Modified Sensor

In this study the electrochemical behavior of 4-aminophenol at titanium dioxide modified carbon paste electrode was investigated using cyclic voltammetry. The working parameters for both, cyclic- and square wave- voltametric studies have been optimized using 5.0 mM 4-aminophenol (4-APOH) in 0.1 M NaH<sub>2</sub>PO<sub>4</sub>.2H<sub>2</sub>O buffer solution. The modified rather than unmodified carbon paste sensor, in neutral medium, has exhibited strong electro-catalytic activity towards the redox characteristics of 4-aminophenol by showing two-fold peak current enhancement and 174 mV peak potential shift towards negative direction. The red-ox peak current ratio (I <sub>pa</sub>/I <sub>pc</sub> = 1.6) suggested high accumulation efficiency of 4-APOH at the modified sensor. The redox process is quasi reversible and involves the transference of 2e<sup>-</sup>s and 2H<sup>+</sup>s followed by diffusion controlled, non-adsorptive behavior of 4-APOH on the surface of sensor at the interface. Further, the electro-catalytic behavior of the modified sensor has been exploited for quantitative determination of 4-aminophenol in pharmaceutical samples using square wave voltammetry. Under optimal experimental conditions, there was a linear relationship between peak current and concentration in the range 2.5 × 10<sup>-5</sup> to 2.0 × 10<sup>-4</sup> M with a correlation coefficient of 0.998 and limit of detection 1.38 × 10<sup>-8</sup> M. The method was successfully applied for the quantitative determination of 4-aminophenol in pharmaceutical formulations against the commercial drugs <em>viz</em>., <em>PANADOL</em>, and <em>Paracetamol</em> at recovery level of 100 ± 1.7 %.

Quantitative Determination of Tremortins in Agricultural Commodities

1971 ◽  
Vol 54 (5) ◽  
pp. 1035-1036
Author(s):  
C T Hou ◽  
A Ciegler ◽  
C W Hesseltine
Keyword(s):  
Thin Layer ◽  
Quantitative Determination ◽  
Thin Layer Chromatography ◽  
Colorimetric Assay ◽  
Agricultural Commodities ◽  
Agricultural Commodity ◽  
Layer Chromatography ◽  
Chloroform Methanol

Abstract The procedure described for the quantitative determination of tremortins in agricultural commodities involves extracting the agricultural commodity with chloroform-methanol (2 + 1), followed by thin layer chromatography and colorimetric assay. This procedure was successfully applied to the analysis of tremortin A added to grains and the production of tremortins A and B on various commodities.

Quantitative determination of longitudinal and transverse cross-relaxation rates

1999 ◽  
Vol 96 (9/10) ◽  
pp. 1608-1615
Author(s):  
T. E. Malliavin ◽  
H. Desvaux ◽  
M. A. Delsuc
Keyword(s):  
Quantitative Determination ◽  
Cross Relaxation ◽  
Relaxation Rates

Quantitative Determination of Gallic acid and Cyanidin-3-O-Glucoside within Sumac Extracts by HPLC-MS/MS

Planta Medica ◽  
2011 ◽  
Vol 77 (12) ◽  
Author(s):  
M Koşar ◽  
F Göger ◽  
N Kırımer ◽  
KHC Başer
Keyword(s):  
Quantitative Determination ◽  
Gallic Acid
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