[reaction: see text] A method for converting 2-nitroalkanols to precursors for stereodefined amino polyols is described. Diphenylvinylsilylation of the 2-nitroalkanols' hydroxy groups and subsequent silyl nitronate generation by using TMS-Cl and Et(3)N in CH(3)CN at 0 degrees C to room temperature led to fused-bicyclic heterocycles through stereoselective intramolecular nitronate-olefin [3 + 2] cycloaddition reaction. Some examples for transforming the cycloadducts to amino polyols are also presented.
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http://dx.doi.org/10.1021/ol035423v | DOI Listing |
Physiol Plant
December 2024
Institut d'Ecologie et des Sciences de l'Environnement de Paris, Univ Paris Est Creteil, CNRS, Sorbonne Université, INRAE, IRD, IEES-Paris, Créteil, France.
Urban vegetation provides many ecosystem services like heat island mitigation. However, urban trees are subjected to the stresses that they are meant to alleviate, with drought being a main constraint. We investigated the drought response strategy of plane trees (Platanus × hispanica), focusing on stomatal regulation and metabolic remodelling.
View Article and Find Full Text PDFPharmaceutics
October 2024
Department of Tissue Engineering and Regenerative Medicine, Faculty of Medicine, Universiti Kebangsaan Malaysia, Cheras 56000, Kuala Lumpur, Malaysia.
Proteins are commonly used in the healthcare industry to treat various health conditions, and most proteins are sensitive to physical and chemical changes. Lyophilization, also known as freeze-drying, involves sublimating water in the form of ice from a substance at low pressure, forming a freeze-dried powder that increases its shelf life. Extreme pressure and varying temperatures in the freeze-drying process may damage the protein's structural integrity.
View Article and Find Full Text PDFBiotechnol Bioeng
October 2024
State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology (ECUST), Shanghai, People's Republic of China.
While traveling through different zones in large-scale bioreactors, microbes are most likely subjected to fluctuating dissolved oxygen (DO) conditions at the timescales of global circulation time. In this study, to mimic industrial-scale spatial DO gradients, we present a scale-down setup based on dynamic feast/famine regime (150 s) that leads to repetitive cycles with rapid changes in DO availability in glucose-limited chemostat cultures of Penicillium chrysogenum. Such DO feast/famine regime induced a stable and repetitive pattern with a reproducible metabolic response in time, and the dynamic response of intracellular metabolites featured specific differences in terms of both coverage and magnitude in comparison to other dynamic conditions, for example, substrate feast/famine cycles.
View Article and Find Full Text PDFFoods
September 2024
School of Food and Nutritional Sciences, University College Cork, T12 YN60 Cork, Ireland.
Fava bean ( L.) is a protein-rich pulse with high nutritional value, but its functional and sensory characteristics limit its application in foods. Solid-state fermentation (SSF) can modify the composition of plant proteins, modulate its functionality, and enhance the sensory aspects.
View Article and Find Full Text PDFMolecules
August 2024
Beltsville Agricultural Research Center, Beltsville, MD 20705, USA.
Considering that maize ( L.) is a staple food for a large segment of the population worldwide, many attempts have been made to improve the nutritional value of its grain and at the same time to achieve sustainable cropping systems. The present study aimed to characterize the composition and nutritional value of maize grain as influenced by cropping system, genetic background (variety), and growing year using untargeted NMR metabolomics.
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