scholarly journals Recyclable Cu(i)/melanin dots for cycloaddition, bioconjugation and cell labelling

2016 ◽  
Vol 7 (9) ◽  
pp. 5888-5892 ◽  
Author(s):  
Yao Sun ◽  
Suhyun Hong ◽  
Xiaowei Ma ◽  
Kai Cheng ◽  
Jing Wang ◽  
...  
Keyword(s):  
Free Water ◽  
Water Soluble ◽  
Cell Labelling ◽  
Ligand Free

We successfully transferred melanin into a novel catalytic platform. Ligand-free, water-soluble, recyclable and biocompatible Cu(i)-loaded melanin dots [Cu(i)/M-dots] was easily prepared and demonstrate excellent properties for classic CuAAC, bioconjugation and cell labelling.

A general strategy to fabricate ligand-free water-soluble up-conversion nanoparticles

2014 ◽  
Vol 613 ◽  
pp. 18-24 ◽  
Author(s):  
Zhihua Li ◽  
Ying Li ◽  
Yanan Wang ◽  
Haixia Miao ◽  
Yu Du ◽  
...  
Keyword(s):  
Free Water ◽  
Water Soluble ◽  
General Strategy ◽  
Ligand Free

Conventional fluorophore-free dual pH- and thermo-responsive luminescent alternating copolymer

2016 ◽  
Vol 7 (45) ◽  
pp. 6895-6900 ◽  
Author(s):  
Biswajit Saha ◽  
Kamal Bauri ◽  
Arijit Bag ◽  
Pradip K. Ghorai ◽  
Priyadarsi De
Keyword(s):  
Aqueous Medium ◽  
Free Water ◽  
Water Soluble ◽  
Alternating Copolymer ◽  
Fluorescent Copolymer

Herein, we have designed and synthesized a novel traditional fluorophore-free water-soluble fluorescent copolymer based on a poly(maleimide-alt-styrene) skeleton, which responds to both pH and temperature in aqueous medium.

scholarly journals Ligand-Free (Z)-Selective Transfer Semihydrogenation of Alkynes Catalyzed by in situ Generated Oxidizable Copper Nanoparticles

2021 ◽  
Author(s):  
Rafał Kusy ◽  
Karol Grela
Keyword(s):  
Suzuki Reaction ◽  
Ammonia Borane ◽  
Water Soluble ◽  
Selective Transfer ◽  
One Pot ◽  
Ammonia Complex ◽  
Ligand Free ◽  
Simple Phase ◽  
Operational Simplicity

Herein, we present (<i>Z</i>)-selective transfer semihydrogenation of alkynes based on in situ generated CuNPs in the presence of hydrogen donors, such as ammonia-borane and a protic solvent. This environmentally-friendly method is characterized by operational simplicity combined with high stereo- and chemoselectivity and functional group compatibility. Auto-oxidation of CuNPs after the semihydrogenation reaction is completed results in the formation of water-soluble ammonia complex, so that the catalyst may be reused several times by simple phase-separation with no need of any special regeneration process. Formed NH<sub>4</sub>B(OR)<sub>4</sub> can be easily transformed back to ammonia-borane or to boric acid. In addition, one-pot tandem sequence involving Suzuki reaction followed by semihydrogenation was presented.<br>

scholarly journals Cyclopentadienone Iron Tricarbonyl Complexes-Catalyzed Hydrogen Transfer in Water

Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 421 ◽  
Author(s):  
Daouda Ndiaye ◽  
Sébastien Coufourier ◽  
Mbaye Diagne Mbaye ◽  
Sylvain Gaillard ◽  
Jean-Luc Renaud
Keyword(s):  
Metal Complexes ◽  
Hydrogen Transfer ◽  
Low Cost ◽  
Pure Water ◽  
Free Water ◽  
Water Soluble ◽  
Tricarbonyl Complex ◽  
Reaction Conditions ◽  
Catalytic Systems ◽  
Iron Tricarbonyl

The development of efficient and low-cost catalytic systems is important for the replacement of robust noble metal complexes. The synthesis and application of a stable, phosphine-free, water-soluble cyclopentadienone iron tricarbonyl complex in the reduction of polarized double bonds in pure water is reported. In the presence of cationic bifunctional iron complexes, a variety of alcohols and amines were prepared in good yields under mild reaction conditions.

Highly selective fluorescence ‘turn off’ sensing of picric acid and efficient cell labelling by water-soluble luminescent anthracene-bridged poly(N-vinyl pyrrolidone)

The Analyst ◽  
2019 ◽  
Vol 144 (11) ◽  
pp. 3620-3634 ◽  
Author(s):  
Rajshree Singh ◽  
Kheyanath Mitra ◽  
Shikha Singh ◽  
Sudipta Senapati ◽  
Vijay Kumar Patel ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Cell Imaging ◽  
Picric Acid ◽  
Water Soluble ◽  
Vinyl Pyrrolidone ◽  
Cell Labelling ◽  
Highly Efficient

ATC-PNVP showed highly efficient and selective fluorescence ‘turn off’ sensing towards picric acid and was also an effective fluorescent probe for cell imaging/tracking.

scholarly journals Preparation, Cytotoxicity, and In Vitro Bioimaging of Water Soluble and Highly Fluorescent Palladium Nanoclusters

2020 ◽  
Vol 7 (1) ◽  
pp. 20 ◽  
Author(s):  
Suresh Thangudu ◽  
Poliraju Kalluru ◽  
Raviraj Vankayala
Keyword(s):  
In Vitro Cytotoxicity ◽  
Molecular Probes ◽  
Water Soluble ◽  
Quantum Yields ◽  
Cell Labelling ◽  
Metal Nanoclusters ◽  
Extinction Coefficients ◽  
Cytotoxicity Studies

Fluorescent probes offer great potential to identify and treat surgical tumors by clinicians. To this end, several molecular probes were examined as in vitro and in vivo bioimaging probes. However, due to their ultra-low extinction coefficients as well as photobleaching problems, conventional molecular probes limit its practical utility. To address the above mentioned challenges, metal nanoclusters (MNCs) can serve as an excellent alternative with many unique features such as higher molar extinction coefficients/light absorbing capabilities, good photostability and appreciable fluorescence quantum yields. Herein, we reported a green synthesis of water soluble palladium nanoclusters (Pd NCs) and characterized them by using various spectroscopic and microscopic characterization techniques. These nanoclusters showed excellent photophysical properties with the characteristic emission peak centered at 500 nm under 420 nm photoexcitation wavelength. In vitro cytotoxicity studies in human cervical cancer cells (HeLa) cells reveal that Pd NCs exhibited good biocompatibility with an IC50 value of >100 µg/mL and also showed excellent co-localization and distribution throughout the cytoplasm region with a significant fraction translocating into cell nucleus. We foresee that Pd NCs will carry huge potential to serve as a new generation bioimaging nanoprobe owing to its smaller size, minimal cytotoxicity, nucleus translocation capability and good cell labelling properties.

Synthesis of sugar-organometallic conjugales: ferrocenyl monosaccharide derivatives

1980 ◽  
Vol 58 (12) ◽  
pp. 1188-1197 ◽  
Author(s):  
Michael J. Adam ◽  
Laurance D. Hall
Keyword(s):  
Group Technology ◽  
Chemical Shifts ◽  
Soluble Sugar ◽  
Free Water ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Water Soluble ◽  
Coupling Constants ◽  
Spin Lattice Relaxation ◽  
Spin Lattice

Suitably blocked carbohydrates containing free thio 4, amino 5, and hydroxyl 10, 19 nucleophilic functionalities have been treated with (a) ferrocenecarbonyl chlorides 2 and 3, (b) N,N-dimethylaminomethylferrocene methiodide 12, and (c) ferrocenyl tosylate 16 to form the ferrocenyl sugar derivatives 6, 7, 8, 9, 11, 13, 14, 15, and 20. Direct conjugation of a free, water-soluble sugar to ferrocene was achieved by the formation of a Schiff's base between glucosamine hydrochloride 25 and ferrocene carboxaldehyde 24. The synthesis of ferrocenyl sugars using bridging group technology is exemplified by the conjugation of the thio sugar 4 to ferrocene via the versatile coupling reagent cyanuric chloride 21 to form the s-triazine compound 23. These products have been studied by 1H nmr spectroscopy: chemical shifts, coupling constants, and proton spin–lattice relaxation measurements.

Performance Stability of Recycle Amine-Free Water-Soluble Coolant in Long Term Operation

2014 ◽  
Vol 625 ◽  
pp. 530-535
Author(s):  
Kenji Yamaguchi ◽  
Yasuo Kondo ◽  
Satoshi Sakamoto ◽  
Mitsugu Yamaguchi ◽  
Ryoichi Nakazawa
Keyword(s):  
Environmental Effect ◽  
Free Water ◽  
Water Soluble ◽  
Water Recovery ◽  
Machining Processes ◽  
Cooling Performance ◽  
Recycling System ◽  
Term Operation ◽  
The Stability

Recently, the concern for the environment has been increasing rapidly. In machining processes, the treatment of water-soluble coolants waste has caused environmental problems. Water-soluble coolants contain surfactants, preservatives, and corrosion inhibitors for maintaining the stability and performance of the coolants. To reduce the management cost and environmental effect of water-soluble coolants, the authors have been studying a recycling system for water-soluble coolants. In the recycling system, oil-free recycle water is isolated from the coolant waste and reused as a diluent of the new coolant. The authors have been developing different types of water recovery methods for the recycling system, and the recovered water from the coolant waste has potential as a diluent for a new coolant. In this report, we focused on the amine (alkanolamine) -free water-soluble coolant. Some amine-free water-soluble coolants have been developed and are commercially available. A reduction in the environmental effect in the waste treatment of coolants is expected with amine-free coolants. We have demonstrated that the amine-free water-soluble coolant has equal or better cooling and lubricating performance compared with the conventional amine-containing coolant. In addition, the amine-free coolant shows good recyclability for the recycling system. The processing time of the recycling treatment of the amine-free coolant has been decreased by half with our recycling process compared with the conventional amine-containing coolant. In this report, we examined the stability, cooling performance and lubricating performance of the recycle amine-free water-soluble coolant in long term operation. The recycle amine-free water-soluble coolant is operated in a 3-axis machining center for several months. We observed concentration, pH, corrosion inhibition performance, cooling performance, and lubricating performance of the coolant. The results from these experiments show the amine-free water-soluble coolant has the advantage to use in the recycling system for water-soluble coolant.

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