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Publikováno v:
Microchimica Acta. 186
An ultrasensitive fluorometric and colorimetric dual-mode assay is described for the determination of the activity of alkaline phosphatase (ALP). ALP catalyzes the decomposition of 2-phospho-L-ascorbic acid, and the ascorbic acid thus generated reduc
Publikováno v:
Microchimica Acta. 185
A competitive colorimetric assay has been established to detect chloramphenicol (CAP). It is based on the use of colloidal and electrostatically stabilized aptamer-modified gold nanoparticles (GNPs). The CAP aptamer is modified by a sequence of 5 ade
Publikováno v:
Microchimica Acta. 185
The authors describe a rapid, sensitive and selective colorimetric assay for sialic acid (SA) based on the use of gold nanoparticles (AuNPs) modified with 3-aminophenylboronic acid (3-APBA) which acts as the recognition probe for SA. 3-APBA contains
Publikováno v:
Microchimica Acta. 185
A method is described for the determination of the pesticide chlorothalonil (CLT). It is based on the finding that citrate-capped gold nanoparticles (AuNPs) undergo aggregation on exposure to chlorothalonil. This is accompanied by a visually detectab
Publikováno v:
Microchimica Acta. 182:2037-2043
We demonstrate a selective and sensitive method for determination of creatinine using citrate-stabilized gold nanoparticles (AuNPs) as a colorimetric probe. It is based on a direct cross-linking reaction that occurs between creatinine and AuNPs that
Publikováno v:
Microchimica Acta. 182:1677-1683
A branched polyethyleneimine was used to functionalize gold nanoparticles (AuNPs). It is found that copper ions rapidly induce the aggregation of such AuNPs, this resulting in a color change from red to purple. The effect can be exploited for visual
Publikováno v:
Microchimica Acta. 182:1501-1507
The colorimetric assay for neomycin presented here is based on melamine-modified gold nanoparticles (mel-AuNPs) and the finding that hydrogen bonding between melamine and neomycin results in the aggregation of mel-AuNPs. This results in a change in t
Publikováno v:
Microchimica Acta. 182:395-400
We describe a highly sensitive method for the determination of traces of xanthine based on the aggregation of citrate-stabilized gold nanoparticles (AuNPs). It is found that, under optimal conditions of pH, the imide group of xanthine is adsorbed on
Publikováno v:
Microchimica Acta. 181:775-781
We have developed a one-step method for the synthesis of mesoporous upconverting nanoparticles (MUCNs) of the type NaYF4:Yb,Er@mSiO2 in ammoniacal ethanol/water solution. The mesoporous silica is directly encapsulating the hydrophobic upconversion na
Publikováno v:
Microchimica Acta. 180:845-853
We report on a fluorescence resonance energy transfer (FRET)-based ratiometric sensor for the detection of Hg(II) ion. First, silica nanoparticles were labeled with a hydrophobic fluorescent nitrobenzoxadiazolyl dye which acts as a FRET donor. A spir
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