Author
Theodore W. Randolph
Other affiliations: MedImmune, University of Colorado Denver, Becton Dickinson ...read more
Bio: Theodore W. Randolph is an academic researcher from University of Colorado Boulder. The author has contributed to research in topics: Protein aggregation & Supercritical fluid. The author has an hindex of 77, co-authored 306 publications receiving 20474 citations. Previous affiliations of Theodore W. Randolph include MedImmune & University of Colorado Denver.
Papers published on a yearly basis
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TL;DR: The purpose of the current review is to provide a fundamental understanding of the mechanisms by which proteins aggregate and by which varying solution conditions, such as temperature, pH, salt type, salt concentration, cosolutes, preservatives, and surfactants, affect this process.
Abstract: Irreversible protein aggregation is problematic in the biotechnology industry, where aggregation is encountered throughout the lifetime of a therapeutic protein, including during refolding, purification, sterilization, shipping, and storage processes. The purpose of the current review is to provide a fundamental understanding of the mechanisms by which proteins aggregate and by which varying solution conditions, such as temperature, pH, salt type, salt concentration, cosolutes, preservatives, and surfactants, affect this process.
1,359 citations
764 citations
TL;DR: In this article, the protein bovine serum albumin (BSA) with a molecular weight of 67,000 is soluble in a carbon dioxide-continuous phase with a nontoxic ammonium carboxylate perfluoropolyether surfactant.
Abstract: Carbon dioxide in the liquid and supercritical fluid states is useful as a replacement for toxic organic solvents. However, nonvolatile hydrophilic substances such as proteins, ions, and most catalysts are insoluble. This limitation was overcome by the formation of aqueous microemulsion droplets in a carbon dioxide-continuous phase with a nontoxic ammonium carboxylate perfluoropolyether surfactant. Several spectroscopic techniques consistently indicated that the properties of the droplets approach those of bulk water. The protein bovine serum albumin (BSA) with a molecular weight of 67,000 is soluble in this microemulsion and experiences an environment similar to that of native BSA in buffer.
542 citations
TL;DR: The purpose of this commentary is to provide brief summaries on the factors affecting protein aggregation and the key aspects of protein aggregation that are associated with immunogenicity, and emphasize the current scientific gaps in understanding and analytical limitations for quantitation of species of large protein aggregates that are referred to as subvisible particles.
542 citations
TL;DR: Results show that hydrogen bonding between carbohydrate and protein is necessary to prevent dehydration-induced protein damage, however, hydrogen bonding alone is not sufficient to protect proteins during lyophilization in the absence of adequate freezing protection.
505 citations
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Journal Article•
3,940 citations
TL;DR: This review presents the most outstanding contributions in the field of biodegradable polymeric nanoparticles used as drug delivery systems from 1990 through mid-2000.
3,284 citations
TL;DR: This review introduces the recent developments in Fourier transform infrared (FTIR) spectroscopy technique and its applications to protein structural studies.
Abstract: Infrared spectroscopy is one of the oldest and well established experimental techniques for the analysis of secondary structure of polypeptides and proteins. It is convenient, non-destructive, requires less sample preparation, and can be used under a wide variety of conditions. This review introduces the recent developments in Fourier transform infrared (FTIR) spectroscopy technique and its applications to protein structural studies. The experimental skills, data analysis, and correlations between the FTIR spectroscopic bands and protein secondary structure components are discussed. The applications of FTIR to the secondary structure analysis, conformational changes, structural dynamics and stability studies of proteins are also discussed.
2,685 citations
TL;DR: Kevin Shakesheff investigates new methods of engineering polymer surfaces and the application of these engineered materials in drug delivery and tissue engineering.
Abstract: s, and 360 patents, and edited 12 books. He has also received over 80 major awards including the Gairdner Foundation International Award, Lemelson-MIT prize, ACS’s Applied Polymer Science and Polymer Chemistry Awards, AICHE’s Professional Progress, Bioengineering, Walker and Stine Materials Science and Engineering Awards. In 1989, Dr. Langer was elected to the Institute of Medicine of the National Academy of Sciences, and in 1992 he was elected to both the National Academy of Engineering and the National Academy of Sciences. He is the only active member of all three National Academies. Kevin Shakesheff was born in Ashington, Northumberland, U.K., in 1969. He received his Bacheclor of Pharmacy degree from the University of Nottingham in 1991 and a Ph.D. from the same institution in 1995. In 1996 he became a NATO Postdoctoral Fellow at MIT, Department of Chemical Engineering. He is currently an EPSRC Advanced Fellow at the School of Pharmaceutical Sciences, The University of Nottingham. His research group investigates new methods of engineering polymer surfaces and the application of these engineered materials in drug delivery and tissue engineering. 3182 Chemical Reviews, 1999, Vol. 99, No. 11 Uhrich et al.
2,532 citations
TL;DR: In the present Communication, a completely "green" synthetic method for producing silver nanoparticles is introduced, by gentle heating of an aqueous starch solution containing silver nitrate and glucose, which produces relatively monodisperse, starchedsilver nanoparticles.
Abstract: In the present Communication, a completely "green" synthetic method for producing silver nanoparticles is introduced. The process is simple, environmentally benign, and quite efficient. By gentle heating of an aqueous starch solution containing silver nitrate and glucose, we produce relatively monodisperse, starched silver nanoparticles. beta-d-Glucose serves as the green reducing agent, while starch serves as the stabilization agent.
2,028 citations