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Vibrational circular dichroism (VCD) emerged during the last decade as a reliable tool for the absolute configuration (AC) determination of organic compounds. The principles, instrumentation, and methodology applied prior to early 2013 were recently reviewed by us. Since VCD is a very dynamic field, the aim of this review is to update VCD advances for the AC assignment of terpenoids, aromatic compounds, alkaloids, and other natural products for the 2013-2014 period, when VCD was applied to the AC assignment of some 70 natural products. In addition, although discovered in 2012, a brief introduction to the VCD exciton coupling approach and its applications in natural products AC assignment is presented.
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Org Lett
September 2025
Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao, 266003, China.
Halogenated phenazines hold promise as antimicrobial and antibiofilm agents, yet are mainly accessed via chemical synthesis. Herein, we report PezW, a novel single-component flavin-dependent halogenase (FDH) that halogenates phenazine scaffolds, notably enabling enzymatic synthesis of bioactive 2-bromo-1-hydroxyphenazine () and 2,4-bromo-1-hydroxyphenazine (). Structural modeling and mutagenesis revealed key residues critical for substrate binding and catalysis.
View Article and Find Full Text PDFHealth Expect
October 2025
Murdoch Children's Research Institute, Parkville, Victoria, Australia.
Introduction: Despite high coverage of routine childhood vaccines, uptake of the human papillomavirus (HPV) vaccine in the Pacific Island nation of Tonga has been slow. Culturally appropriate communication resources on the importance, safety, and effectiveness of the HPV vaccine are critical to support acceptance and uptake. To develop these resources, it is important to understand what people want to know.
View Article and Find Full Text PDFJ Food Sci
September 2025
College of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou, China.
Primary agricultural products are closely related to our daily lives, as they serve not only as raw materials for food processing but also as products directly purchased by consumers. These products face the issue of freshness decline and spoilage during both production and consumption. Freshness degradation induces sensory deterioration and nutritional loss and promotes harmful substance accumulation, causing gastrointestinal issues or even endangering life.
View Article and Find Full Text PDFInt J Biol Macromol
September 2025
Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, National and Local Collaborative Engineering Center of Chinese Medicinal Resources Industrialization and Formulae Innovative Medicine, Jiangsu Provincial Key Laboratory of Functional Substances in Traditional C
The immune system is the ultimate defense against diseases and its dysregulated homeostasis greatly threatens human health. Natural polysaccharides have a variety of biological activities and show promising applications in immunomodulation. In this study, we characterized the structure of the polysaccharide IRPS-TE-3 from Isatidis Radix using morphological analysis, molecular weight analysis, monosaccharide composition analysis, methylation analysis and nuclear magnetic resonance spectroscopy.
View Article and Find Full Text PDFInt J Biol Macromol
September 2025
Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, People's Republic of China. Electronic address:
Chitosan and tannin are both promising renewable materials for food packaging; however, their effectiveness is limited by incomplete interactions between them. Therefore, phytic acid and octadecylamine were employed to create chitosan-tannin-phytic acid-octadecylamine (CTPO) films that are flame-retardant, UV-resistant, antibacterial and hydrophobic for food packaging applications. The findings indicate that the CTPO film exhibited excellent hydrophobicity and mechanical properties, with a water contact angle of 133.
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