Enhanced peroxidase-like activity of Mo-doped ceria nanoparticles for sensitive colorimetric detection of glucose

2018 ◽  
Vol 10 (1) ◽  
pp. 76-83 ◽  
Author(s):  
Xue Jiao ◽  
Wanyi Liu ◽  
Di Wu ◽  
Wenhao Liu ◽  
Hongjie Song
Keyword(s):  
Catalytic Activity ◽  
Blood Glucose ◽  
Quantitative Determination ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Ceria Nanoparticles ◽  
Doped Ceria ◽  
Enzyme Mimics ◽  
Small Nanoparticles

Ultra-small nanoparticles of Mo-doped ceria (Mo/CeO2 NPs) possess enhanced peroxidase-like catalytic activity and these enzyme mimics are used here for the successful quantitative determination of blood glucose via a colorimetric method.

Colorimetric detection of hypochlorite based on the morphological changes of silver nanoprisms to spherical nanoparticles

2017 ◽  
Vol 9 (21) ◽  
pp. 3151-3158 ◽  
Author(s):  
Thangarasu Sasikumar ◽  
Malaichamy Ilanchelian
Keyword(s):  
Quantitative Determination ◽  
Morphological Changes ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Spherical Nanoparticles ◽  
Colorimetric Probe ◽  
Silver Nanoprisms

In this work, we have developed a simple, rapid, sensitive and selective colorimetric method for the quantitative determination of hypochlorite (ClO−) ions by using triangular silver nanoprisms (AgNPRs) as a colorimetric probe.

Collaborative Study of a Method for Sodium Lauryl Sulfate in Egg Whites

1968 ◽  
Vol 51 (3) ◽  
pp. 540-543
Author(s):  
John Wiskerchen
Keyword(s):  
Sulfuric Acid ◽  
Quantitative Determination ◽  
Sodium Lauryl Sulfate ◽  
Collaborative Study ◽  
Colorimetric Method ◽  
Egg White ◽  
Mean Deviation ◽  
Lauryl Sulfate ◽  
Benzethonium Chloride

Abstract A colorimetric method for the quantitative determination of sodium lauryl sulfate in liquid, frozen, and powdered egg white was studied by eight collaborators. Determinations were made on flake and powdered egg white at levels of 0.05, 0.1, and 0.2% (w/w) and on liquid egg white at levels of 0.006, 0.0125, and 0.0250% (w/w) sodium lauryl sulfate. The egg white is dissolved in water, and the protein is precipitated with ethanol and removed by filtration. An aliquot of the filtrate is evaporated to dryness, and the residue is dissolved in water and acidified with sulfuric acid. The sodium lauryl sulfate is complexed with Azure A, extracted into chloroform, and determined spectrophotometrically at 637 mμ. A blank determination is made on another aliquot of the filtrate by complexing the sodium lauryl sulfate with benzethonium chloride. This is a stable colorless complex. Average recoveries in the collaborative study were 98—102% with a mean deviation of 2.8—5.4%. It is recommended that the method be adopted as official, first action.

scholarly journals Determination of amino sugars in mixtures containing glucosamine, galactosamine and muramic acid

1968 ◽  
Vol 109 (1) ◽  
pp. 13-18 ◽  
Author(s):  
D. E. S. Stewart-Tull
Keyword(s):  
Cell Wall ◽  
Quantitative Determination ◽  
Column Chromatography ◽  
Bacterial Species ◽  
Colorimetric Method ◽  
Previous Treatment ◽  
Amino Sugars ◽  
Muramic Acid ◽  
Molar Ratios

A colorimetric method is described whereby the direct quantitative determination of glucosamine, galactosamine and muramic acid can be achieved without previous treatment of the cell-wall hydrolysate, for example by column chromatography. Molar ratios of hexosamines in cell-wall preparations, from a number of bacterial species, determined by this method were found to be in general agreement with previously published results.

A colorimetric method for the quantitative determination of thiazolidine-4-carboxylic acids

1966 ◽  
Vol 17 (3) ◽  
pp. 513-520 ◽  
Author(s):  
Guido G. Guidotti ◽  
Angelo F. Borghetti ◽  
Lodovico Loreti
Keyword(s):  
Quantitative Determination ◽  
Carboxylic Acids ◽  
Colorimetric Method

Colorimetric Method for the Quantitative Determination of Acetaminophen in Serum

1979 ◽  
Vol 15 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Christopher S. Frings ◽  
Joseph M. Saloom
Keyword(s):  
Quantitative Determination ◽  
Colorimetric Method

scholarly journals Highly Sensitive and Selective Colorimetric Detection of Methylmercury Based on DNA Functionalized Gold Nanoparticles

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2679 ◽  
Author(s):  
Zheng-Jun Xie ◽  
Xian-Yu Bao ◽  
Chi-Fang Peng
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Limit Of Detection ◽  
Low Cost ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Optimal Conditions ◽  
Surface Deposition ◽  
Highly Sensitive ◽  
Dna Strand

A new colorimetric detection of methylmercury (CH3Hg+) was developed, which was based on the surface deposition of Hg enhancing the catalytic activity of gold nanoparticles (AuNPs). The AuNPs were functionalized with a specific DNA strand (HT7) recognizing CH3Hg+, which was used to capture and separate CH3Hg+ by centrifugation. It was found that the CH3Hg+ reduction resulted in the deposition of Hg onto the surface of AuNPs. As a result, the catalytic activity of the AuNPs toward the chromogenic reaction of 3,3,5,5-tetramethylbenzidine (TMB)-H2O2 was remarkably enhanced. Under optimal conditions, a limit of detection of 5.0 nM was obtained for CH3Hg+ with a linear range of 10–200 nM. We demonstrated that the colorimetric method was fairly simple with a low cost and can be conveniently applied to CH3Hg+ detection in environmental samples.

New colorimetric method for quantitative determination of protein in urine.

1977 ◽  
Vol 23 (5) ◽  
pp. 811-812 ◽  
Author(s):  
H Yatzidis
Keyword(s):  
Quantitative Determination ◽  
Tannic Acid ◽  
Chloride Solution ◽  
Room Temperature ◽  
Colorimetric Method ◽  
Ferric Chloride Solution ◽  
Acid Protein ◽  
Analytical Recovery ◽  
Violet Color

Abstract Total urinary protein is rapidly precipitated at room temperature by tannic acid. The tannic acid/protein precipitate, dissolved in aqueous triethanolamine/ferric chloride solution, gives a purple-violet color of high absorptivity. Absorbance at 510 nm is linearly related to concentration from 0.05 to 1.50 A for a protein content of 0.05 to 1.50 g/liter, and less than 5 mg/liter can be detected. The CV and analytical recovery ranged from 0.5 to 1.8% and 98 to 103%, respectively. Nonprotein urinary constituents do not interfere.

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