scholarly journals The fluorescence of a mercury probe based on osthol

2021 ◽  
Vol 17 ◽  
pp. 22-27
Author(s):  
Guangyan Luo ◽  
Zhishu Zeng ◽  
Lin Zhang ◽  
Zhu Tao ◽  
Qianjun Zhang
Keyword(s):  
Mass Spectrometry ◽  
Aqueous Solution ◽  
Detection Limit ◽  
Stoichiometric Ratio ◽  
Mercury Ions ◽  
Recognition Mechanism ◽  
H Nmr ◽  
Specific Selectivity ◽  
Good Linear Correlation

The ability of osthol (OST) to recognize mercury ions in aqueous solution was studied using fluorescence, UV–vis spectrophotometry, mass spectrometry, and 1H NMR spectroscopy, and the recognition mechanism is discussed. The results showed that OST and Hg2+ can form a complex with a stoichiometric ratio of 1:1. The binding constant was 1.552 × 105 L∙mol−1, having a highly efficient and specific selectivity for Hg2+. The fluorescence intensity of OST showed a good linear correlation with the Hg2+ concentration (6.0 × 10−5 to 24.0 × 10−5 mol∙L−1, R 2 = 0.9954), and the detection limit of the probe was 5.04 × 10−8 mol∙L−1, which can be used for the determination of Hg2+ traces.

Spectrofluorimetric Study of the Inclusion Complex of 7-Hydroxymethylnalidixic Acid with γ-Cyclodextrin in Aqueous Solution

1997 ◽  
Vol 51 (5) ◽  
pp. 684-688 ◽  
Author(s):  
Isabel Durán-Merás ◽  
Arsenio Muñoz De La Peña ◽  
Francisco Salinas ◽  
Isabel Rodríguez Cáceres
Keyword(s):  
Aqueous Solution ◽  
Inclusion Complex ◽  
Formation Constant ◽  
Spectral Characteristics ◽  
Stoichiometric Ratio ◽  
Acid Base ◽  
Method Of Determination ◽  
Cyclodextrin Cavity ◽  
Complexation Process

A fluorimetric study on the spectral characteristics and acid-base behavior of 7-hydroxymethylnalidixic acid has been performed. The host–guest complexation process between γ-cyclodextrin and 7-hydroxymethylnalid ixic acid has also been investigated by fluorescence spectroscopy. Scatchard and Benesi-Hildebr and methods have been applied to determine the stoichiometry of the complex, and a 1:1 stoichiometric ratio has been established. A K1 = 118 ± 25 M−1 formation constant has been calculated for the inclusion complex, by using the changes produced on the fluorescence of 7-hydroxymethylnalid ixic acid, when it is included on the hydrophobic cyclodextrin cavity. A fluorimetric method of determination of 7-hydroxymethylnalid ixic acid, in γ-cyclodextrin aqueous solution, has been proposed. The analytical parameters and detection and quantification limits of the method have been determined.

scholarly journals Determination of Combined Residues of Metalaxyl and 2,6-Dimethylaniline Metabolites in Urine byGas Chromatography/Mass Spectrometry

1996 ◽  
Vol 79 (1) ◽  
pp. 117-123 ◽  
Author(s):  
John V Headley ◽  
Donald B Maxwell ◽  
Christopher Swyngedouw ◽  
John R Purdy
Keyword(s):  
Mass Spectrometry ◽  
Detection Limit ◽  
Electron Impact ◽  
Methylene Chloride ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Mass Spectrometric ◽  
Steam Extraction ◽  
Chromatographic Mass

Abstract A gas chromatographic/mass spectrometric (GC/MS) method for determination of combined residues of the fungicide metalaxyl and its metabolites in urine containing the 2,6-dimethylaniline moiety is described. The method is a modification of a method of Balasubramanian and Perez for analysis of metalaxyl invegetables. Noted modifications include replacement of steam extraction with extraction by methylene chloride and use of electron impact ionization GC/MS in the selected-ion mode. The method is linear over the range of 0.1-5 μg 2,6- dimethylaniline/g urine and has a detection limit of 0.025 μg/g.

scholarly journals A Novel Method for Determination of Protein in Human Serum Utilizing the Trihydroxylphenylfluorone-Molybdenum(VI) Complex as a Probe by Fluorescence Spectrometry

2007 ◽  
Vol 90 (1) ◽  
pp. 238-243 ◽  
Author(s):  
Qin Wei ◽  
Hongmin Ma ◽  
Caihong Duan ◽  
Jin Wang ◽  
Shuyuan Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Detection Limit ◽  
Human Serum ◽  
Fluorescence Intensity ◽  
Acetate Buffer Solution ◽  
Buffer Solution ◽  
Protein Assay ◽  
Novel Method

Abstract The fluorescence intensity of the trihydroxylphenylfluorone-molybdenum(VI) Mo(VI) complex is quenched by protein. Based on this, a novel method for protein assay in aqueous solution was developed. With pH 3.75 acetic acidsodium acetate buffer solution, in the presence of p-octyl polyethylene glycol phenyl ether microemulsion, the quenched fluorescence intensity is proportional to the concentration of bovine serum albumin (BSA) in the range of 07.00 μg/mL, and the detection limit of BSA is 5.65 ng/mL. There is no interference from amino acids and most metal ions. The method developed in this paper has been used for the successful determination of protein in human serum.

A highly selective two-photon fluorescent probe for the determination of mercury ions

The Analyst ◽  
2015 ◽  
Vol 140 (9) ◽  
pp. 3285-3289 ◽  
Author(s):  
Fang Liu ◽  
Changqin Ding ◽  
Ming Jin ◽  
Yang Tian
Keyword(s):  
Detection Limit ◽  
Fluorescent Probe ◽  
High Selectivity ◽  
Fluorescent Sensor ◽  
Mercury Ions ◽  
Two Photon ◽  
Specific Recognition ◽  
Low Detection Limit ◽  
Recognition Molecule

A two-photon fluorescent sensor ATD was developed for Hg2+ determination with high selectivity and low detection limit, in which two-photon fluorophore TD was designed and synthesized with a specific recognition molecule for Hg2+ – PT.

Gas Chromatographic Determination of the Plant Growth Regulator Flurprimidol in Soil and Soil-Grass Samples

1986 ◽  
Vol 69 (4) ◽  
pp. 572-575
Author(s):  
Sheldon D West ◽  
Bonnie S Rutherford
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Detection Limit ◽  
Plant Growth ◽  
Plant Growth Regulator ◽  
Chromatographic Determination ◽  
Gas Chromatography Mass Spectrometry ◽  
Electron Capture Detection ◽  
Control Samples

Abstract A method is described for the determination of flurprimidol residues in soil and soil-grass samples. Flurprimidol is extracted from the sample by refluxing with methanol-water. An aliquot is partitioned into hexane and purified by alumina B Sep-Pak column chromatography. The compound is detected and measured by gas chromatography with electron capture detection. Residue identity is confirmed by gas chromatography-mass spectrometry with detection at m/z 269.0. The detection limit is 0.01 ppm, and recoveries for control samples fortified with flurprimidol at 0.01-2.0 ppm averaged 80% for soil and 78% for soil-grass samples.

The Sensitive Fluorimetric Method for the Determination of Curcumin Using the Enhancement of Mixing Micelle

2014 ◽  
Vol 525 ◽  
pp. 89-92
Author(s):  
Wei Huang ◽  
Feng Wang ◽  
Hong Long Zhu
Keyword(s):  
Aqueous Solution ◽  
Detection Limit ◽  
Fluorescence Intensity ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Benzene Sulfonate ◽  
Fluorimetric Method ◽  
Dodecyl Benzene Sulfonate

It is found that the fluorescence of curcumin is greatly enhanced by La3+ in the prescence of sodium dodecyl benzene sulfonate (SDBS). Based on this, a sensitive fluorimetric method for the determination of curcumin in aqueous solution is proposed. In the HOAc-NaOAc buffer, the fluorescence intensity of curcumin is proportional to the concentration of curcumin in the range of 0.0074-7.4μg·mL-1 and the detection limit is 3.66ng·mL-1. The actual samples are satisfactorily determined.

Cucurbit[7]uril host-guest complexes with cationic bis(4,5-dihydro-1H-imidazol-2-yl) guests in aqueous solution

2006 ◽  
Vol 84 (6) ◽  
pp. 905-914 ◽  
Author(s):  
D Saroja N Hettiarachchi ◽  
Donal H Macartney
Keyword(s):  
Mass Spectrometry ◽  
Aqueous Solution ◽  
Nmr Spectroscopy ◽  
Stability Constants ◽  
Electrospray Mass Spectrometry ◽  
Hydrophobic Core ◽  
Guest Complex ◽  
H Nmr ◽  
Host Guest Complex ◽  
Proton Resonances

The host–guest interactions between cucurbit[7]uril and a series of novel cationic bis(4,5-dihydro-1H-imidazol-2-yl)arene and 1-(4,5-dihydro-1H-imidazol-2-yl)- and 1,3-bis(4,5-dihydro-1H-imidazol-2-yl)-adamantane guests have been investigated in aqueous solution using UV–vis and NMR spectroscopy, and electrospray mass spectrometry. With the exception of the 1,3-bis(4,5-dihydro-1H-imidazol-2-yl)adamantane (which binds externally to the CB[7]), these guests form very stable inclusion complexes with slow exchange on the 1H NMR timescale. The direction and magnitude of the complexation-induced shifts (CIS) in the proton resonances of the guests are indicative of the residence of the hydrophobic core of the guest within the CB[7] cavity and the charged 4,5-dihydro-1H-imidazol-2-yl units outside the cavity adjacent to the carbonyl-lined portals of the host. The CIS values and the inclusion stability constants have been correlated with the nature of the guest core and with the distance between the charges on the terminal 4,5-dihydro-1H-imidazol-2-yl rings.Key words: cucurbit[7]uril, host–guest complex, dihydroimidazolyl, inclusion stability constants.

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