Current Isothermal Titration Calorimetry (ITC) data in the literature have relatively high errors in the measured enthalpies of protein-ligand binding reactions. There is a need for universal validation standards for titration calorimeters. Several inorganic salt co-precipitation and buffer protonation reactions have been suggested as possible enthalpy standards. The performances of several commercial calorimeters, including the VP-ITC, ITC200, and Nano ITC-III, were validated using these suggested standard reactions.
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http://dx.doi.org/10.3390/ijms10062752 | DOI Listing |
Pharmaceutics
January 2025
Department of Pharmaceutics and Medicinal Chemistry, University of the Pacific, Stockton, CA 95211, USA.
Micelles, liposomes, and solid lipid nanoparticles (SLNs) are promising drug delivery vehicles; however, poor aqueous stability requires post-processing drying methods for maintaining long-term stability. The objective of this study was to compare the potential of lipid-based micelles, liposomes, and SLNs for producing stable re-dispersible spray-dried powders with trehalose or a combination of trehalose and L-leucine. This study provides novel insights into the implementation of spray drying as a technique to enhance long-term stability for these lipid-based nanocarriers.
View Article and Find Full Text PDFPolymers (Basel)
January 2025
Department of Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials, Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany.
pH-responsive polyamidoamine (PAMAM) dendrimers are used as well-defined building blocks to design light-switchable nano-assemblies in solution. The complex interplay between the photoresponsive di-anionic azo dye Acid Yellow 38 (AY38) and the cationic PAMAM dendrimers of different generations is presented in this study. Electrostatic self-assembly involving secondary dipole-dipole interactions provides well-defined assemblies within a broad size range (10 nm-1 μm) with various shapes.
View Article and Find Full Text PDFJ Sci Food Agric
January 2025
School of Food Science and Engineering, Hainan University, Haikou, People's Republic of China.
Background: This study aimed to elucidate the transport mechanism of lycopene-loaded nanomicelles to improve intestinal absorption of lycopene. The interactive mechanism between lycopene and nanomicelles was investigated through isothermal titration calorimetry (ITC). The cytotoxicity, cellular uptake, endocytosis, and intracellular transport pathways of lycopene-loaded nanomicelles were investigated using the Caco-2 cell model.
View Article and Find Full Text PDFGels
December 2024
Department of Food Science and Technology, The Ohio State University, 2015 Fyffe Rd., Columbus, OH 43210, USA.
The effects of CaCl addition before (PreCa) or after (PostCa) heating pea protein-pectin dispersions on the formed gel's rheological and microstructural properties were investigated. Isothermal titration calorimetry (ITC) revealed that CaCl bound both pea proteins and pectins through a spontaneous exothermic reaction and pectin exhibited a stronger binding affinity to CaCl. In PreCa gels, low levels of CaCl (5 and 10 mM) increased the gel elasticity (increase in the storage modulus, G') and their microstructural compactness.
View Article and Find Full Text PDFJ Pharm Anal
October 2024
Department of Dermatology, The Third Hospital of Hebei Medical University, Shijiazhuang, 050051, China.
Tetrandrine (TET), a natural bisbenzyl isoquinoline alkaloid extracted from S. Moore, has diverse pharmacological effects. However, its effects on melanoma remain unclear.
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