Boronic Acid Based Peptidic Receptors for Pattern-Based Saccharide Sensing in Neutral Aqueous Media, an Application in Real-Life Samples

2007 ◽  
Vol 129 (44) ◽  
pp. 13575-13583 ◽  
Author(s):  
Nicola Y. Edwards ◽  
Thomas W. Sager ◽  
John T. McDevitt ◽  
Eric V. Anslyn
Keyword(s):  
Boronic Acid ◽  
Aqueous Media ◽  
Real Life

Copper(ii)-catalyzed protoboration of allenes in aqueous media and open air

2021 ◽  
Author(s):  
Russell F. Snead ◽  
Jan Nekvinda ◽  
Webster L. Santos
Keyword(s):  
Boronic Acid ◽  
Room Temperature ◽  
Aqueous Media ◽  
Boronic Acid Derivatives

A copper(ii)-catalyzed internal protoboration of monosubstituted allenes efficiently occurs in water at room temperature and open air to generate 1,1-disubstituted vinyl boronic acid derivatives.

Monitoring of reversible boronic acid–diol interactions by fluorine NMR spectroscopy in aqueous media

2015 ◽  
Vol 13 (33) ◽  
pp. 8817-8821 ◽  
Author(s):  
L. Iannazzo ◽  
E. Benedetti ◽  
M. Catala ◽  
M. Etheve-Quelquejeu ◽  
C. Tisné ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Convenient Method ◽  
Boronic Acid ◽  
Aqueous Media ◽  
Fluorine Nmr

A new convenient method for monitoring boronic acid–diol interactions in aqueous media based on 19F NMR spectroscopy with fluorinated boronic acid probes is described.

“On water” palladium catalyzed diastereoselective boronic acid addition to structurally diverse cyclopropane nitriles

2020 ◽  
Vol 18 (43) ◽  
pp. 8886-8898
Author(s):  
Dwaipayan Das ◽  
Prasun Mukherjee ◽  
Asish R. Das
Keyword(s):  
Boronic Acid ◽  
Aqueous Media ◽  
Catalytic Amount ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Arylboronic Acids ◽  
Acid Addition ◽  
Brönsted Acid ◽  
Diastereoselective Addition ◽  
Palladium Catalyzed

An efficient palladium catalyzed diastereoselective addition of arylboronic acids to complex spirocyclopropyl dinitriles is developed in the presence of a catalytic amount of DBSA as a Brønsted acid surfactant in aqueous media.

scholarly journals Marble Waste Sludges as Effective Nanomaterials for Cu (II) Adsorption in Aqueous Media

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2305
Author(s):  
Ventura Castillo Ramos ◽  
José Rivera Utrilla ◽  
Antonio Ruiz Sánchez ◽  
María Victoria López Ramón ◽  
Manuel Sánchez Polo
Keyword(s):  
Ionic Strength ◽  
Aqueous Medium ◽  
Aqueous Media ◽  
Real Life ◽  
Intraparticle Diffusion ◽  
Surface Complexes ◽  
X Ray ◽  
Adsorption Sites ◽  
Life Conditions ◽  
Marble Waste

This study evaluated the waste generated by a Spanish marble-producing company as adsorbent for the removal of copper (Cu [II]) from aqueous media. Six marble waste sludge samples were studied, and the following operational parameters were analyzed in discontinuous regime, including pollutant concentration, pH, temperature, nature of aqueous medium, and ionic strength. The applicability of the adsorbent material was assessed with experiments in both continuous and discontinuous regimes under close-to-real-life conditions. A pseudo-second order model yielded a better fit to the kinetic data. Application of the intraparticle diffusion model revealed two well-differentiated adsorption stages, in which the external material transfer is negligible and intraparticle diffusion is the controlling stage. The equilibrium study was better fitted to a Freundlich-type isotherm, predicting elevated maximum adsorption values (22.7 mg g−1) at a relatively low initial Cu (II) concentration (25 ppm), yielding a highly favorable chemisorption process (n >> 1). X-ray fluorescence study identified calcite (CaCO3) as the main component of marble waste sludges. According to X-ray diffraction analysis, Cu (II) ion adsorption occurred by intercalation of the metallic cation between CaCO3 layers and by the formation of surface complexes such as CaCO3 and Cu2(CO3)(OH)2. Cu (II) was more effectively removed at medium pH, lower temperature, and lower ionic strength of the aqueous medium. The salinity and dissolved organic matter in surface, ground-, and waste-waters negatively affected the Cu (II) removal process in both continuous and discontinuous regimes by competing for active adsorption sites. These findings demonstrate the applicability and effectiveness of marble-derived waste sludges as low-cost and readily available adsorbents for the treatment of waters polluted by Cu (II) under close-to-real-life conditions.

scholarly journals Assessment of Nanopollution in Water Environments from Commercial Products

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2537
Author(s):  
Raisibe Florence Lehutso ◽  
Melusi Thwala
Keyword(s):  
Risk Assessment ◽  
Water Resources ◽  
Aqueous Media ◽  
Real Life ◽  
Engineered Nanomaterials ◽  
Assessment Data ◽  
Initial Amount ◽  
Commercial Products ◽  
Coating Agents ◽  
Total Concentrations

The use of nano-enabled products (NEPs) can release engineered nanomaterials (ENMs) into water resources, and the increasing commercialisation of NEPs raises the environmental exposure potential. The current study investigated the release of ENMs and their characteristics from six commercial products (sunscreens, body creams, sanitiser, and socks) containing nTiO2, nAg, and nZnO. ENMs were released in aqueous media from all investigated NEPs and were associated with ions (Ag+ and Zn2+) and coating agents (Si and Al). NEPs generally released elongated (7–9 × 66–70 nm) and angular (21–80 × 25–79 nm) nTiO2, near-spherical (12–49 nm) and angular nAg (21–76 × 29–77 nm), and angular nZnO (32–36 × 32–40 nm). NEPs released varying ENMs’ total concentrations (ca 0.4–95%) of total Ti, Ag, Ag+, Zn, and Zn2+ relative to the initial amount of ENMs added in NEPs, influenced by the nature of the product and recipient water quality. The findings confirmed the use of the examined NEPs as sources of nanopollution in water resources, and the physicochemical properties of the nanopollutants were determined. Exposure assessment data from real-life sources are highly valuable for enriching the robust environmental risk assessment of nanotechnology.

Design, synthesis and evaluation of a boronic acid based artificial receptor for l-DOPA in aqueous media

2013 ◽  
Vol 49 (88) ◽  
pp. 10403 ◽  
Author(s):  
Haruna Ueno ◽  
Takayuki Iwata ◽  
Nozomi Koshiba ◽  
Daisuke Takahashi ◽  
Kazunobu Toshima
Keyword(s):  
Boronic Acid ◽  
Aqueous Media ◽  
Design Synthesis ◽  
Artificial Receptor

Examination of pinanediol–boronic acid ester formation in aqueous media: relevance to the relative stability of trigonal and tetrahedral boronate esters

2020 ◽  
Vol 18 (14) ◽  
pp. 2716-2726
Author(s):  
Mayte A. Martínez-Aguirre ◽  
Marcos Flores-Alamo ◽  
Felipe Medrano ◽  
Anatoly K. Yatsimirsky
Keyword(s):  
Boronic Acid ◽  
Relative Stability ◽  
Acid Ester ◽  
Aqueous Media ◽  
Boronate Esters ◽  
Inverted Order ◽  
Ester Formation ◽  
Strain Release ◽  
Diol Ester

The “inverted” order of stabilities Ktrig > Ktet is observed for pinanediol boronate esters in spite of the existence of the usual strain release effect in the O–B–O angle of the cyclic diol ester.

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