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Unusual free trisaccharides in caprine colostrum discovered by logically derived sequence tandem mass spectrometry.
Sci Rep
January 2025
Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 106216, Taiwan.
Free oligosaccharides in human milk have many biological functions for infant health. The reducing end of most human milk oligosaccharides is lactose, and caprine milk was reported to contain oligosaccharides structurally similar to those present in human milk. The structures of oligosaccharides were traditionally determined using nuclear magnetic resonance spectroscopy or enzyme digestion followed by various detection methods, e.
View Article and Find Full Text PDFTuning Isomerism Effect in Organic Bulk Additives Enables Efficient and Stable Perovskite Solar Cells.
Nanomicro Lett
January 2025
The Quzhou Affiliated Hospital of Wenzhou Medical University, Quzhou People's Hospital, Quzhou, 324000, People's Republic of China.
Organic additives with multiple functional groups have shown great promise in improving the performance and stability of perovskite solar cells. The functional groups can passivate undercoordinated ions to reduce nonradiative recombination losses. However, how these groups synergistically affect the enhancement beyond passivation is still unclear.
View Article and Find Full Text PDFInterplay of Monosaccharide Configurations on the Deacetylation with Lipase-B.
J Org Chem
January 2025
Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia.
Configurational differences in monosaccharides determine the products and selectivity of the transesterification reaction with lipase-B (CAL-B). The β-anomers of peresterified pyranose monosaccharides tend to yield anomeric deprotection products, while the α-anomers preferentially react at the sixth or fourth position. CAL-B differentiates between enantiomers, either reacting more rapidly with d-enantiomers of monosaccharides or having a different selectivity based on the enantiomer.
View Article and Find Full Text PDFTungsten-catalyzed stereodivergent isomerization of terminal olefins.
Chem Sci
December 2024
Department of Chemistry, The Scripps Research Institute 10550N. Torrey Pines Road, La Jolla CA 92037 USA
Catalytic alkene isomerization is a powerful synthetic strategy for preparing valuable internal alkenes from simple feedstocks. The utility of olefin isomerization hinges on the ability to control both positional and stereoisomerism to access a single product among numerous potential isomers. Within base-metal catalysis, relatively little is known about how to modulate reactivity and selectivity with group 6 metal-catalyzed isomerization.
View Article and Find Full Text PDFCharacterization of Odor-Active 2-Ethyldimethyl-1,3,6-trioxocane Isomers in Polyurethane Materials.
Polymers (Basel)
December 2024
Department of Chemistry, TUM School of Natural Sciences, Technical University of Munich, Lichtenbergstraße 4, 85748 Garching, Germany.
Polyurethane materials, widely used in indoor environments, occasionally exhibit unpleasant odors. An important source of polyurethane odorants is polyether polyols. Previous studies identified odorous 2-ethyldimethyl-1,3,6-trioxocanes in polyurethane materials and polyols but did not investigate the odor activity of the individual isomers.
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