A5069486062- Metabolomics and Mass Spectrometry Studies
- NMR spectroscopy and applications
- Molecular spectroscopy and chirality
- Protein Structure and Dynamics
- Proteoglycans and glycosaminoglycans research
- Seaweed-derived Bioactive Compounds
- Marine Sponges and Natural Products
- Analytical Chemistry and Chromatography
- Glycosylation and Glycoproteins Research
- Computational Drug Discovery Methods
- Carbohydrate Chemistry and Synthesis
- Synthetic Organic Chemistry Methods
- Microbial Natural Products and Biosynthesis
- Heparin-Induced Thrombocytopenia and Thrombosis
- Bone health and treatments
- Microfluidic and Capillary Electrophoresis Applications
- Biochemical and Molecular Research
- Coagulation, Bradykinin, Polyphosphates, and Angioedema
- Advanced MRI Techniques and Applications
- Enzyme Structure and Function
- Protein purification and stability
- Photosynthetic Processes and Mechanisms
- HIV/AIDS drug development and treatment
- Hemoglobin structure and function
- Chemical and Physical Properties in Aqueous Solutions
Baxter (United States)
2010-2025
University of Illinois Urbana-Champaign
1999-2002
Tohoku University
2002
Urbana University
2000
University of Hawaiʻi at Mānoa
1996-1998
University of Hawaii System
1998
Monosaccharide analysis is a critical way to profile the composition of complex carbohydrates. Methods analyze neutral and amino sugars have been established for long time, but methods acidic are rare. The sugars, including uronic acids sialic acids, also important components in some In this report, high-performance anion-exchange chromatography method with pulsed amperometric detection was initially developed different acids. Subsequently, complete monosaccharides, most neutral, amino,...
The increased interest in using monoclonal antibodies (mAbs) as a platform for biopharmaceuticals has led to the need new analytical techniques that can precisely assess physicochemical properties of these large and very complex drugs purpose correctly identifying quality attributes (QA). One QA, higher order structure (HOS), is unique essential establishing consistency biopharmaceutical manufacturing, detecting process-related variations from manufacturing changes comparability between...
Fucoidan is a highly complex sulfated polysaccharide commonly extracted from brown seaweed. In addition to their many biological activities, fucoidans have recently been demonstrated inhibit or increase coagulation at different concentration ranges. Their structural features, i.e. molecular weight (Mw), Mw distribution, degree of sulfation, monosaccharide composition, and linkages, are known affect these activities. Therefore, structure-activity relationship (SAR) analysis fucoidan crucial...
The performance of three quantitative NMR methods was compared in terms short-term and long-term precision accuracy, robustness, linear range, general applicability. Internal Reference method employs a reference material co-dissolved with sample; the External contained separate solution; third method, known as Electronic REference To access In vivo Concentrations (ERETIC), an externally calibrated digital peak. results were most precise remained stable within 0.1% for at least 4 weeks. from...
We report the inhibition of a human recombinant geranylgeranyl diphosphate synthase (GGPPSase) by 23 bisphosphonates and six azaprenyl diphosphates. The IC50 values range from 140 nM to 690 μM. None nitrogen-containing that inhibit farnesyl were effective in inhibiting GGPPSase enzyme. Using three-dimensional quantitative structure−activity relationship/comparative molecular field analysis (CoMFA) methods, we find good correlation between experimental predicted activity: R2 = 0.938, Rcv2...
In addition to five new depsipeptides related kulolide-1 (1), further examination of the mollusk Philinopsis speciosa has yielded a linear peptide, pupukeamide (14), and an unprecedented macrolide, tolytoxin-23-acetate (7). Chemical makeup suggested that compounds originate from blue-green algae are transmitted via herbivorous mollusks P. speciosa. This could be verified by laboratory experiment. The structures were determined largely spectroscopic techniques stereochemistry hydrolysis...
We report the results of 3D-QSAR/CoMFA investigations activity bisphosphonate drugs, farnesyl pyrophosphate synthase (FPPSase) inhibitors, in inhibition bone resorption as well growth Dictyostelium discoideum. In case D. discoideum, we find an experimental versus QSAR predicted pIC(50) R(2) value 0.94 for 16 bisphosphonates over 9-1200 microM range IC(50) values, a cross-validated = 0.90, and bootstrapped 0.94, demonstrate that this approach has predictive utility (a 0.18 rms error three...
From late December 2007 to February 2008, the number of adverse responses heparin infusions rose noticeably above baseline levels in North America, ultimately resulting a widespread recall all vial products made by Baxter Healthcare. Using various analytical techniques and de novo synthesis fully sulfated chondroitin sulfate (FSCS) derivative, authors have confirmed identity contaminant as an oversulfated (OSCS) also defined heterogeneity concentration this lots heparin. both contaminated...
Polysialic acid (PSA) is a high molecular weight glycan composed of repeat units α(2→8) linked 5-N-acetyl-neuraminic acid. Mild periodate oxidation PSA selectively targets the end sialic ring containing three adjacent alcohols generating putative aldehyde, which can be used for terminal attachment to therapeutic proteins. The work presented here permitted complete NMR peak assignments not only units, but also two at each oxidized PSA, an intermediate, improve drug performance. were made...
Native polysialic acid (natPSA) is a high-molecular-weight glycan composed of repeat units α-(2 → 8) linked N-acetylneuraminic (Neu5Ac). Mild periodate oxidation PSA selectively targets the end sialic ring containing three adjacent alcohols generating putative aldehyde, which can be used, after attachment linker molecule, for terminal to protein. Previously, we showed that oxidized (oxoPSA) contained hemiacetal at site and react with an aminooxy group in conjugation reaction form stable...
Capillary electrophoresis (CE) of heparin, oversulfated chondroitin sulfate (OSCS), dermatan (DS), and related impurities were separated in 5 min using 1 M lithium phosphate buffer, pH 2.5 on an 8.5 cm × 25 μm i.d. capillary. The separation was optimized for overall speed, resolution between OSCS DS, particular, the limit detection (LOD) OSCS. LOD less than 0.03% heparin. migration time precision always 0.5% all solutes. peak area 1.9% 2% DS at 0.4% concentration levels, respectively....
We have expressed [U‐ 13 C, 15 N]‐labeled Saccharomyces cerevisiae iso ‐1 cytochrome c C102T;K72A in Escherichia coli with a yield of 11 mg/l growth medium. Nuclear magnetic resonance (NMR) studies were conducted on the Fe 3+ form protein. report herein chemical shift assignments for amide 1 H and N, C°, C α , β resonances based upon series three‐dimensional NMR experiments: HNCA, HN(CO)CA, HNCO, HN(CA)CO, HNCACB, HCA(CO)N, HCCH‐TOCSY HBHA(CBCA)NH. An investigation shifts threonine residues...
High-field 1 H NMR T2 relaxation studies were used to characterize the changes in physical phases of water, NaCl, and dextrose solutions over a temperature range -65 15 °C. The data analyzed with inverse Laplace transform linear fit logarithm time domain signal. Two liquid detected for NaCl at lower temperatures assigned low high concentrated solution domains. was found be present between -30 -5 °C -55 solution. Copyright © 2017 John Wiley & Sons, Ltd.
Classical 1D 1H NMR spectra are prototypic for spectroscopy in that they represent a wealth of chemical information encoded into convoluted graphs or patterns contain complex features (aka multiplets), even seemingly simple molecules. Accordingly, the utility depends on theoretical and visual skills required to extract all physical parameters usable structural quantitative information. Moreover, it ability analyst communicate them effectively reproducibly. After decades continuous...