scholarly journals Silver Nanoplates for Colorimetric Determination of Xanthine in Human Plasma and in Fish Meat via Etching/Aggregation/Fusion Steps

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5739
Author(s):  
Hung-Cheng Hsu ◽  
Pei-Wen Liao ◽  
Hsiang-Tzu Lee ◽  
Wei-Chen Liu ◽  
Mei-Lin Ho
Keyword(s):  
Blood Plasma ◽  
Color Change ◽  
Colorimetric Method ◽  
Partial Substitution ◽  
Colorimetric Determination ◽  
Detection Mechanism ◽  
Silver Nanoplates ◽  
Fish Meat ◽  
In Blood Plasma

Silver nanoplates (AgP) were prepared and used in a colorimetric method for the evaluation of Xanthine (Xan) in blood plasma and fish meat. The detection mechanism for Xan was observed to occur via etching of AgP particles/aggregation/fusion steps, resulting in a color change from blue to grey. First, the basic Xan solution is adsorbed through partial substitution of capping molecules around the AgP with Xan, and then intermolecular hydrogen bonds form between AgP and AgP. Subsequently, the titrant Xan solution further etches the AgP and finally fuses particles together. Owing to the step by step mechanism, the response range towards Xan has two linear regression ranges: 0.15–0.60 μM and 0.61–3.00 μM, respectively. The detection limit in the range of 0.15–0.60 μM is 0.011 μM (S/N = 3). AgP exhibits good selectivity for Xan over other potential interferents such as amino acids and blood proteins. AgP achieves rapid detection of Xan and can be applied to the satisfactory determination of Xan in blood plasma and fish meat. This colorimetric sensor is easy to use, cost effective, fast, selective and user friendly.

scholarly journals Colorimetric Determination of Hypochlorite Based on the Oxidative Leaching of Gold Nanorods

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1629 ◽  
Author(s):  
Yurong Ma ◽  
Yingyi Zhu ◽  
Benzhi Liu ◽  
Guixiang Quan ◽  
Liqiang Cui
Keyword(s):  
Gold Nanorods ◽  
Color Change ◽  
Colorimetric Assay ◽  
Tap Water ◽  
Critical Role ◽  
Colorimetric Method ◽  
Residual Chlorine ◽  
Colorimetric Determination ◽  
Oxidative Leaching

Hypochlorite plays a critical role in killing microorganisms in the water. However, it can also cause cardiovascular diseases, neuron degeneration, and cancer to humans. Although traditional methods feature excellent sensitivity and reliability in detecting hypochlorite, the expensive instruments and strict determination conditions have limited their application in environmental analysis to some extent. Thus, it is necessary and urgent to propose a cheap, facile, and quick analytical assay for hypochlorite. This paper proposes a colorimetric assay for hypochlorite utilizing gold nanorods (AuNRs) as the nanoreactor and color reader. The AuNRs were acquired via a reported seed-mediated method. NaClO with strong oxidation property can cause the etching of gold from the longitudinal tips of AuNRs, which could shorten the aspect ratio of AuNRs, decrease the absorption in the UV–Vis spectrum and also induce the solution color changing from red to pale yellow. Thus, according to the solution color change and the absorbance of longitudinal surface plasmon resonance of AuNRs, we established the calibration curve of NaClO within 0.08 μM to 125 μM (∆Abs = 0.0547 + 0.004 CNaClO, R2 = 0.9631). Compared to traditional method, we obtained the conversion formula between the concentration of residual-chlorine in tap water and the concentration of hypochlorite detected by the proposed colorimetric assay, which is Cresidual-chlorine = 0.24 CNaClO. Finally, the real application of the colorimetric assay in tap water was successfully performed, and the accuracy of the colorimetric method can reach from −6.78% to +8.53%.

scholarly journals Hydrogen-Bonding Recognition-Induced Colorimetric Determination of Hydrazine Based on the Tryptophan Capped Gold Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Wenhua Gao ◽  
Jing Xi ◽  
Yunsheng Chen ◽  
Song Xiao ◽  
Xingqing Wang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Color Change ◽  
Detection System ◽  
Colorimetric Method ◽  
Cost Effective ◽  
Colorimetric Determination ◽  
Chloroauric Acid ◽  
Sample Analysis ◽  
Higher Temperature

A simple, cost-effective, and rapid colorimetric method for hydrazine detection using tryptophan-caped gold nanoparticles (Trp-AuNPs) has been developed. Tryptophan (Trp) is a protein with reducibility and amino group which can reduce chloroauric acid (HAuCl4) to AuNPs and modify the surface of AuNPs simultaneously. The Trp-AuNPs could be used to quantitatively detect hydrazine and showed different responses to vary concentration of hydrazine in an aqueous solution based on the aggregation-induced color change of Trp-AuNPs. The real water sample analysis verified the conclusion. The sensitivity of the detection system was influenced by the size of AuNPs which is determined by the pH of the detection system, the concentration of Trp, and the react time. We found that higher temperature contributed to more rapidly results. The detection system can detect as low as 1 μM hydrazine. We expect our approach to have wide-ranging applications in the developing region for monitoring water quality in some areas.

Two SPRi biosensors for the determination of cathepsin S in blood plasma

Talanta ◽  
2021 ◽  
Vol 225 ◽  
pp. 121900
Author(s):  
Lukasz Oldak ◽  
Anna Sankiewicz ◽  
Beata Żelazowska-Rutkowska ◽  
Bogdan Cylwik ◽  
Zenon Lukaszewski ◽  
...  
Keyword(s):  
Blood Plasma ◽  
Cathepsin S ◽  
In Blood Plasma

scholarly journals DETERMINATION OF TRYPSIN INHIBITOR IN BLOOD PLASMA

1953 ◽  
Vol 204 (1) ◽  
pp. 147-152 ◽  
Author(s):  
Shirley F. McCann ◽  
M. Laskowski
Keyword(s):  
Blood Plasma ◽  
Trypsin Inhibitor ◽  
In Blood Plasma

The convenient UPLS method for the determination of Ceftiofur in blood plasma

2020 ◽  
Author(s):  
Artem V. Baklykov ◽  
Konstantin A. Chistiakov ◽  
Dmitry S. Kopchuk ◽  
Grigory V. Zyryanov ◽  
Gennady L. Rusinov ◽  
...  
Keyword(s):  
Blood Plasma ◽  
In Blood Plasma

Colorimetric Determination of Hydroxyproline as Measure of Collagen Content in Meat and Meat Products: NMKL Collaborative Study

1990 ◽  
Vol 73 (1) ◽  
pp. 54-57 ◽  
Author(s):  
Kurt Kolar
Keyword(s):  
Collaborative Study ◽  
Colorimetric Method ◽  
Meat Products ◽  
Acid Oxidation ◽  
Colorimetric Determination ◽  
Mean Values ◽  
Collaborative Studies ◽  
Freeze Dried ◽  
Analytical Result

Abstract A colorimetric method for the determination of hydroxyproline as a measure of collagen in meat and meat products has been collaboratively studied in 18 laboratories. The method includes hydrolysis with sulfuric acid, oxidation with chloramine- T, and formation of a reddish purple complex with 4- dimethylaminobenzaldehyde. Five frozen and 3 freeze-dried samples were tested, ranging in content from 0.11 to 0.88% and from 0.39 to 4.0% hydroxyproline, respectively. The mean values of 2 identical samples were 0.245 and 0.251 %. The average recovery from a spiked sample was 96.1 %. The hydroxyproline content of a known sample (a mixture of 2 samples in the ratio 5:2) was calculated to 1.42%, which agrees well with the analytical result, 1.40%. In comparison with other collaborative studies, based on the ISO analytical method, the repeatability and reproducibility of this method agree well with the other results. This method was accepted as an official NMKL method by all national Committees, and has been adopted official first action by AOAC as an NMKLAOAC method.

scholarly journals Determination of organoarsenic species in blood plasma by HPLC-ICP MS

1999 ◽  
Vol 13 (3) ◽  
pp. 183-187 ◽  
Author(s):  
Les Ebdon ◽  
Andrew Fisher ◽  
Norman B. Roberts ◽  
Magdi Yaqoob
Keyword(s):  
Blood Plasma ◽  
Icp Ms ◽  
In Blood Plasma
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