Fluorescence and colorimetric detection of ATP based on a strategy of self-promoting aggregation of a water-soluble polythiophene derivative

2015 ◽  
Vol 51 (40) ◽  
pp. 8544-8546 ◽  
Author(s):  
Dandan Cheng ◽  
Yandong Li ◽  
Jing Wang ◽  
Yujiao Sun ◽  
Lu Jin ◽  
...  
Keyword(s):  
Detection Limit ◽  
Colorimetric Detection ◽  
Water Soluble ◽  
Side Chain ◽  
Polythiophene Derivative

A sensitive fluorescent and colorimetric dual-modal probe for the detection of ATP has been developed based on a strategy of self-promoting aggregation of a cationic polythiophene derivative bearing anthracene groups in the side chain with a detection limit as low as 10−9 M.

Lowest aqueous picomolar fluoride ions and in vivo aluminum toxicity detection by an aluminum(iii) binding chemosensor

2021 ◽  
Author(s):  
Monojit Das ◽  
Debdeep Maity ◽  
Tusar Kanta Acharya ◽  
Sudip Sau ◽  
Chandan Giri ◽  
...  
Keyword(s):  
Detection Limit ◽  
Aluminum Toxicity ◽  
Biological Systems ◽  
Water Soluble ◽  
Fluoride Ions ◽  
Toxicity Effect

A water-soluble PET-based chemosensor is developed which can detect Al(iii) and F− ions up to nano- and picomolar (lowest detection so far) detection limit, respectively, also utilized to establish aluminum-toxicity effect in biological systems.

Pyridine-based poly(aryleneethynylene)s: a study on anionic side chain density and their influence on optical properties and metallochromicity

RSC Advances ◽  
2015 ◽  
Vol 5 (116) ◽  
pp. 96189-96193 ◽  
Author(s):  
Markus Bender ◽  
Kai Seehafer ◽  
Marlene Findt ◽  
Uwe H. F. Bunz
Keyword(s):  
Optical Properties ◽  
Water Soluble ◽  
Side Chain ◽  
Phenylene Ethynylene ◽  
Alternating Copolymers

We report the Pd-catalyzed synthesis of six new water soluble, alternating poly(p-phenylene-ethynylene-p-pyridinylene-ethynylene) (abcb-alternating) copolymers and one poly(p-pyridinyleneethynylene).

scholarly journals Enhancement of the Peroxidase-Like Activity of Iodine-Capped Gold Nanoparticles for the Colorimetric Detection of Biothiols

Biosensors ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 113 ◽  
Author(s):  
Chia-Chen Chang ◽  
Tsz-Lian Hsu ◽  
Chie-Pein Chen ◽  
Chen-Yu Chen
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Detection Limit ◽  
Enzymatic Activity ◽  
Catalytic Properties ◽  
Colorimetric Assay ◽  
Colorimetric Detection ◽  
Synergetic Effect ◽  
Vis Spectroscopy ◽  
Wide Range

A colorimetric assay was developed for the detection of biothiols, based on the peroxidase-like activity of iodine-capped gold nanoparticles (AuNPs). These AuNPs show a synergetic effect in the form of peroxidase-mimicking activity at the interface of AuNPs, while free AuNPs and iodine alone have weak catalytic properties. Thus, iodine-capped AuNPs possess good intrinsic enzymatic activity and trigger the oxidation of 3,3’,5,5’-tetramethylbenzidine (TMB), leading to a change in color from colorless to yellow. When added to solution, biothiols, such as cysteine, strongly bind to the interface of AuNPs via gold-thiol bonds, inhibiting the catalytic activity of AuNPs, resulting in a decrease in oxidized TMB. Using this strategy, cysteine could be linearly determined, at a wide range of concentrations (0.5 to 20 μM), with a detection limit of 0.5 μM using UV-Vis spectroscopy. This method was applied for the detection of cysteine in diluted human urine.

A reusable fluorescent sensor from electrosynthesized water-soluble oligo(1-pyrenesulfonic acid) for effective detection of Fe3+

2018 ◽  
Vol 42 (24) ◽  
pp. 19450-19457 ◽  
Author(s):  
Nannan Jian ◽  
Kaiwen Lin ◽  
Bin Guo ◽  
Ge Zhang ◽  
Ximei Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Detection Limit ◽  
High Selectivity ◽  
Fluorescent Sensor ◽  
Water Soluble ◽  
Low Detection Limit

Electrosynthesized oligo(1-pyrenesulfonic acid) displays high selectivity, low detection limit and outstanding reversibility in the detection of Fe3+ in aqueous solution.

Tolerance of Birdsfoot Trefoil (Lotus corniculatus) to 2,4-D

Weed Science ◽  
1986 ◽  
Vol 34 (3) ◽  
pp. 373-376 ◽  
Author(s):  
Cynthia Davis ◽  
Dean L. Linscott
Keyword(s):  
Protein Synthesis ◽  
Lotus Corniculatus ◽  
Water Soluble ◽  
Side Chain ◽  
Birdsfoot Trefoil ◽  
Tolerance Mechanisms ◽  
Differential Binding ◽  
Dichlorophenoxy Acetic Acid ◽  
The Relationship ◽  
Soluble Components

Translocation and metabolism of14C-2,4-D [(2,4-dichlorophenoxy)acetic acid] and effects of 2,4-D on protein synthesis were compared in ‘T–68’ (2,4-D tolerant) and ‘Viking’ (susceptible) birdsfoot trefoil (Lotus corniculatusL.) in an attempt to elucidate some tolerance mechanisms. After14C-2,4-D was applied to upper trifoliate leaves, significantly less 2,4-D was found in stems, in leaves below the treated leaves, and in roots of T–68 compared to Viking. More 2,4-D was bound to alcohol-insoluble cellular constituents of T–68 leaves, stems, and roots. When alcohol-soluble components were fractionated, slightly more14C water-soluble compounds were found in T–68, indicating further inactivation by glycosylation. No amino acid-2,4-D conjugates were found. The rate of14CO2evolution from14C-2,4-D treated seedlings in T–68 was five times that in Viking. Protein synthesis appeared to be more rapid in T–68 but the relationship to 2,4-D was not clear. In part, 2,4-D resistance in T–68 may result from its ability to inactivate 2,4-D by differential binding and conjugation and by side chain breakdown as indicated by14CO2release.

Colorimetric Detection of Trace Arsenic(III) in Aqueous Solution Using Arsenic Aptamer and Gold Nanoparticles

2014 ◽  
Vol 67 (5) ◽  
pp. 813 ◽  
Author(s):  
Minglei Yu
Keyword(s):  
Aqueous Solution ◽  
Gold Nanoparticles ◽  
Detection Limit ◽  
Colorimetric Assay ◽  
Colorimetric Detection ◽  
Colour Change ◽  
Colorimetric Sensing ◽  
Detection Range ◽  
Colorimetric Indicator ◽  
Blue Solution

In this study, trace arsenic(iii) (AsIII) in aqueous solution was detected by applying a classical aptamer-based gold nanoparticles colorimetric sensing strategy. An arsenic aptamer was used as a sensing probe and gold nanoparticles as a colorimetric indicator. In the absence of AsIII, the gold nanoparticles were stabilised by the arsenic aptamer and remained dispersed at high NaCl concentrations, displaying a red solution. Contrarily, in the presence of AsIII, the gold nanoparticles were prone to aggregation, owing to the formation of aptamer–AsIII complex between the arsenic aptamer and AsIII, and thus exhibited a blue solution. By monitoring the colour change, a simple and fast colorimetric assay for AsIII was established with a detection range of 1.26–200 ppb and a detection limit of 1.26 ppb. Because this colorimetric assay only involves common reagents and can be assessed visually, it holds great potential for arsenic(iii) monitoring in environment-related and other applications.

Movement and Metabolism of CIPC in Resistant and Susceptible Species

Weed Science ◽  
1968 ◽  
Vol 16 (4) ◽  
pp. 432-435 ◽  
Author(s):  
G. N. Prendeville ◽  
Y. Eshel ◽  
C. S. James ◽  
G. F. Warren ◽  
M. M. Schreiber
Keyword(s):  
Amaranthus Retroflexus ◽  
Water Soluble ◽  
Side Chain ◽  
Pastinaca Sativa ◽  
Plant Component ◽  
Natural Plant ◽  
Plant Parts ◽  
Rf Values ◽  
Sublethal Concentrations ◽  
Root Treatment

Sublethal concentrations of isopropyl N-(3-chlorophenyl)- carbamate (CIPC) labeled with 14C in the ring or side chain were applied to all leaves present or to the roots of redroot pigweed (Amaranthus retroflexus L.), pale smartweed (Polygonum lapathiofolium L.), and parsnip (Pastinaca sativa L.). These species were selected because of their different susceptibilities to CIPC. The herbicide did not move out of the treated leaves in pigweed and smartweed and only slightly in parsnip in 21 days. In root treatment (3 days), the herbicide moved to all plant parts and the extent of movement was essentially the same in all species. Water soluble metabolites, which differed in Rf values were extracted from all three species. The metabolites apparently were not the result of cleavage of the CIPC molecule, but were more likely conjugates of CIPC with natural plant component(s). Very little 14CO2 was released by any of the species in 3 days. These data indicate that differences in movement and metabolism are not sufficient to account for the different susceptibilities of these three plant species.

Isolation of lignocellulose-decomposing actinomycetes and degradation of specifically 14C-labeled lignocelluloses by six selected Streptomyces strains

1979 ◽  
Vol 25 (11) ◽  
pp. 1270-1276 ◽  
Author(s):  
Mary Beth Phelan ◽  
Don L. Crawford ◽  
Anthony L. Pometto III
Keyword(s):  
Water Soluble ◽  
Side Chain ◽  
Lignocellulose Degradation ◽  
Structural Components ◽  
Natural Habitats ◽  
Cultural Conditions ◽  
Ring Structures ◽  
Limited Degree ◽  
Enrichment Techniques

Forty-two actinomycete strains were isolated by enrichment techniques from soils and other lignocellulose-containing natural habitats. Isolates were screened for their lignocellulose-decomposing abilities using a substrate weight loss – 14C-labeled lignocellulose degradation assay which determined the relative abilities of each isolate to attack lignin versus glucan components of lignocellulose. Six Streptomyces strains were selected for further study, based upon their abilities to decompose significantly both lignin and glucan components of lignocellulose. The selected strains were examined under defined cultural conditions for their abilities to decompose 14C-labeled lignocelluloses prepared from Douglas fir. The 14C-labeled lignocellulose substrates included specifically lignin-labeled or glucan-labeled lignocelluloses, and two [14C]lignin lignocelluloses labeled specifically in only the lignin side chain or ring components. Results showed that the Streptomyces strains decomposed substantial amounts of both lignin and glucan components to 14CO2, and 14C-labeled water-soluble products. As compared with previously described lignocellulose-degrading streptomycetes, these strains were generally more efficient decomposers of the lignin component of lignocellulose, but were similar in their abilities to decompose the glucan component. Characterization of growth on specifically labeled lignins showed that aromatic ring structures within the lignin were cleaved and a substantial percentage of the ring carbons were released as CO2. In contrast, side-chain components were attacked to only a limited degree. These streptomycetes were similar to other recently characterized lignin-decomposing bacteria in their overall abilities to degrade lignin, but their specificity of attack on the structural components of lignin appears to be different.

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