A5033285290- Analytical chemistry methods development
- Sphingolipid Metabolism and Signaling
- Asymmetric Hydrogenation and Catalysis
- Luminescence and Fluorescent Materials
- Conducting polymers and applications
- Advanced Chemical Sensor Technologies
- Molecular spectroscopy and chirality
- Porphyrin and Phthalocyanine Chemistry
- Microfluidic and Capillary Electrophoresis Applications
- Marine Sponges and Natural Products
- X-ray Spectroscopy and Fluorescence Analysis
- Innovative Microfluidic and Catalytic Techniques Innovation
- Analytical Chemistry and Sensors
- Asymmetric Synthesis and Catalysis
- CO2 Reduction Techniques and Catalysts
- Catalytic Cross-Coupling Reactions
- Axial and Atropisomeric Chirality Synthesis
- Bioactive Compounds and Antitumor Agents
- Pesticide Residue Analysis and Safety
- Advanced Synthetic Organic Chemistry
- Click Chemistry and Applications
- Bamboo properties and applications
- Advanced Polymer Synthesis and Characterization
- Mesoporous Materials and Catalysis
- Polymer Nanocomposites and Properties
North Dakota State University
2024
Brigham Young University
2023
Ateneo de Manila University
2010-2019
University of Connecticut
2002-2011
Boehringer Ingelheim (United States)
2003-2004
Due to significant advances in instrumentation, many previously specialized techniques have become “routine” user facilities. However, detailed knowledge held by experts has often not been relayed general users, so they rely on entry-level information, basic principles, and comparison with literature results for data analysis. As a result, major errors the analysis of multiple surface material techniques, including x-ray photoelectron spectroscopy (XPS), appearing scientific literature....
[structure: see text] The new BIPI ligands are phosphinoimidazolines that can be electronically tuned in three different ligand regions to explore electronic effects asymmetric catalysis. Their application the Heck reaction (AHR) creation of a chiral quaternary center is described. Enantioselectivity shown for first time depend linearly on phosphine electron density. Changing basicity by variation R(2) or R(3) substituents reverses facial selectivity.
Tracking dynamic cellular processes necessitates fluorescent materials that are photostable, biocompatible, water-soluble, nanosized, and nontoxic. In this study, highly carbon dots (CDs) were produced from cheap readily available sources, citric acid (CA) Philippine citrus (Citrus japonica Thunb.) or calamansi juice (CJ) via a microwave-assisted method. A number of synthetic conditions investigated systematically to optimize the preparation CDs CA CJ. The formation mechanism, surface...
Sphinganines can be synthesized in just three steps from easily prepared serine-derived Weinreb amide 4. Pre-deprotonation of the acidic (N-H and O-H) protons 4 allows for its efficient conversion to amino ketones 5. Such selectively reduced either erythro- or threo-sphinganines. Partially protected sphinganines 11 are also readily accessible five Thus, represents one most versatile templates described date sphinganine synthesis.
A new water soluble cationic polythiophene derivative, poly(N,N,N-trimethyl-3-(2-(thiophen-3-yl)acetamido)propan-1-aminium iodide), was synthesized via two consecutive post-polymerization functionalizations of poly(methyl 2-(thiophen-3-yl)acetate). This conjugated polymer binds DNA at N/P = 5 and forms polyplexes 10. Its potential use as a theranostic gene delivery vehicle is investigated here.
The Boehringer-Ingelheim phosphinoimidazoline (BIPI) ligands were applied to the formation of chiral quaternary centers in asymmetric Heck reaction. Several different substrates examined detail, using more than 70 members this new ligand class. Hammett relationships determined through systematic variation electronics. All showed essentially same behavior, where enantioselectivity increased as made electron-deficient. Ligand optimization has led catalysts which give highest...
[reaction: see text] A serine-derived 1,5-dioxaspiro[3.2]hexane template is shown to be a useful precursor for both aminodiol and aminotriol sphingoid bases by its conversion D-erythro-dihydrosphingosine D-xylo-phytoshingosine.
The amphiphilic block copolymer methoxy-poly(ethylene glycol)-poly(epsilon-caprolactone) (mPEG-PCL) was grafted to 2-hydroxyethyl cellulose (HEC) produce nano-sized micellar nanoparticles. nanoparticles were loaded with anti-tumor drug, doxorubicin (DOX) and the size of DOX-loaded determined by dynamic light scattering (DLS) in aqueous solution be from 197.4 230 nm. subjected co-culture macrophage cells showed that these used as drug carrier are not recognized foreign bodies. Overexpression...
ABSTRACT Due to the toxicity associated with exposure organochlorine pesticides, new materials capable of selectively capturing and detecting these compounds are highly desirable. In this study, imprinted polymers were prepared using three pesticides—dieldrin (DE), endosulfan (EN), or hexachlorobenzene (HCB) as templates. The MIPs polymerized via precipitation polymerization. yields over 90% particle sizes ranging from 62 214 nm. Binding studies combined GC‐ECD analysis showed that each...
A modular route toward the synthesis of P,N ligands containing a fluxional group along pyrazoline ring core is described. The racemic were accessed in three steps from commercially available fluoroacetophenone overall yields ranging 18 to 76%. enantiopure obtained using semi-preparative chiral high-performance liquid chromatography and enantioselective phase-transfer catalysis. effectiveness new was assessed palladium-catalyzed allylic alkylation with diphenylpropenyl acetate...
Abstract Accurate quantification of histamine levels in food and biological samples is important for monitoring the quality products detection pathophysiological conditions. In this study, solution processable histamine‐imprinted microspheres were synthesized at 30°C via dilute free radical phototochemical polymerization technique using ethylene glycol dimethacrylate (EGDMA) as crosslinker methacrylic acid (MAA) monomer. The processability resulting polymer dictated by monomer feed...
Elevated histamine (HTM) levels are closely linked to food poisoning as well pathophysiological allergic diseases. In this study, HTM-imprinted, solution-processable microspheres were prepared via high-dilution conventional thermal polymerization (CTP) and controlled radical (CRP) using ethylene glycol dimethacrylate (80 or 90 wt %) methacrylic acid at 60 °C in acetonitrile evaluated recognition materials for sensing applications. The polymers selective HTM binding studies, cross-rebinding,...
Frontal analysis capillary electrophoresis was used to evaluate the binding performance of molecularly imprinted microspheres (MIM) toward its template histamine and analogs at pH 7, compared high liquid chromatographic method. In both methods, batch employed parameters were calculated from measured concentration unbound amine analytes afforded comparable equilibrium dissociation constants (Kd ∼ 0.4 mM). FACE easily carried out shorter equilibration time (i.e. 30 min) without need separate...
A ligation protocol has been developed in which a peptide containing an N-terminal serine is linked via its side-chain alcohol to the C-terminal carboxylate of second by Mitsunobu esterification. N-Deprotection and subsequent exposure weak amine base triggers O-to-N acyl transfer, delivering desired product. unique aspect this strategy use as nucleophile rather than electrophile. As result, occurs without evidence epimerization. broad scope nucleophiles tolerated, including proline hindered...
ADVERTISEMENT RETURN TO ISSUEPREVAdditions & Corr...Additions CorrectionsNEXTORIGINAL ARTICLEThis notice is a correctionProbing Electronic Effects in the Asymmetric Heck Reaction with BIPI LigandsCarl A. Busacca, Danja Grossbach, Regina C. So, Erin M. O'Brie, and Earl SpinelliCite this: Org. Lett. 2003, 5, 9, 1595Publication Date (Web):March 19, 2003Publication History Published online19 March 2003Published inissue 1 May...
Abstract Synthesis, characterization, and FRET interaction of pyrene‐tagged β‐hydroxy acid perylen‐3‐ylmethylmethacrylate co‐ N ‐dodecylmethacrylamide polymer are described. The fluorescent donor, acid‐pyrene boronic ester was synthesized from commercially available alkyl ketene dimer via subsequent hydrolysis, reduction esterification providing the donor. Conversely, acceptor by co‐polymerization N‐dodecylmethacryamide perylen‐3‐ylmethylmethacrylate, where latter prepared perylene in three...
The ability of molecularly-imprinted polymers (MIPs) to recognize and remember the shape an imprinted molecule has expanded application these materials for separation sample enrichment. This paper describes binding efficiency characteristics MIP prepared selective extraction artemisinin, a potent anti-malaria compound present in Artemisia annua. Artemisinin is currently used combination therapy treatment severe cases malaria.The microspheres were obtained via precipitation polymerization...
Abstract For see ChemInform in Full Text.