The structural diversity of marine natural products is considered a potential resource for the pharmaceutical industry. In our study of marine-derived compounds, one bacterium S-1 was discovered to have the ability to produce bioactive natural products. After a further chemistry investigation, one novel 4-aminopyridinium derivative, 4-(dimethylamino)-1-(2-((4hydroxybenzoyl)oxy)propyl)pyridin-1-ium (), along with 15 known cyclic dipeptides (-) were isolated from the bacterium S-1 derived from a shallow sea sediment. The structures of compounds - were elucidated through comprehensive NMR spectroscopic and specific optical rotation (OR) data analyses. Compound showed antibacterial activity against with an MIC value of 50 µg/mL. This is the first study to discover a pyridinium derivative and cyclic dipeptides from
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http://dx.doi.org/10.3390/molecules30010007 | DOI Listing |
Molecules
December 2024
College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
Carbohydr Polym
March 2025
Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China. Electronic address:
Uncontrolled release of active agents in active packaging reduces antimicrobial efficacy, hindering the effective protection of perishable products from microbial infection. Herein, a novel defective engineering was proposed to design defective and hollow ZIF-8 structures grown on TEMPO oxidized cellulose nanofibrils (TOCNFs) and use them as fast-reacting nanocarriers for loading and controlled release curcumin (Cur) in sodium alginate (SA) active packaging systems (CZT-Cur-SA). By employing stable chelation between tannic acid (TA) and ZIF-8 zinc ions, the connections between zinc ions and imidazole ligands were severed to form a loose and hollow structure, which facilitates the rapid reaction and release of active ingredients triggered by pH changes in the microenvironment.
View Article and Find Full Text PDFMolecules
December 2024
School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
The esterase EstSIT01 from can catalyze the asymmetric hydrolysis of -dimethyl ester to produce the crucial chiral intermediate (4, 5)-hemimethyl ester for -biotin synthesis. Despite its high yields and stereoselectivity, the low thermostability of EstSIT01 limits its practical application. Herein, two kinds of rational strategies were combined to enhance the thermostability of EstSIT01.
View Article and Find Full Text PDFFront Microbiol
December 2024
Department of Laboratory Sciences, The People's Hospital of Yuhuan, Yuhuan, China.
Background: The mechanisms underlying the resistance of the genus to aminoglycosides are complex, which poses a challenge for the efficient treatment of infectious diseases caused by these pathogens. To help clinicians treat infections more effectively, a more comprehensive understanding of antibiotic resistance mechanisms is urgently needed.
Methods: Plates were streaked to isolate bacteria from the intestinal contents of fish.
J Environ Manage
December 2024
Institute of Pollution Control and Environmental Health, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China.
The new-type submerged granular sludge membrane bioreactor (S-GSMBR) was constructed by installing a membrane module inside an upflow anaerobic sludge blanket. S-GSMBR achieved the fast start-up (47 d) and long-term stable operation (133 d) of mainstream Anammox process as well as the effective control of membrane fouling. The maximum nitrogen removal rate and efficiency were 0.
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