IR and UV-Vis was employed to analyzed the spectrum effect of hydrogen bonding on the partially hydrolyzed polyacrylamide polymer(HPAM). The study reveals that, the characteristic absorption peak of free amino group moves to the low frequency due to the formation of intramolecular hydrogen bonding between amide group and carboxyl group. In the water solution, intramolecular hydrogen bonding is the main factor that shifted maximal absorption towards long wavelength. Intramolecular hydrogen bonding and intermolecular hydrogen bonds exist at the same time in the water solution contains intermediate sodium and calcium ions. While in the high concentration solution, the main form between amide group and carboxyl group is intermolecular hydrogen bonding. The effect of hydrogen bonding on the spectrum of HPAM demonstrates different extent in various systems. In the water solution, the maximum absorption wavelength red shifts 8 nm. In the system contains sodium ions, this shift is 4 nm. And this shift is only 2 nm in the solution contains both sodium ions and calcium ions.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Design, synthesis, anti-inflammatory evaluation, and molecular docking studies of novel quinazoline-4(3)-one-2-carbothioamide derivatives.
RSC Adv
January 2025
Institute of Chemistry, Vietnam Academy of Science and Technology Hanoi Vietnam
In this paper, a series of novel quinazoline-4(3)-one-2-carbothioamide derivatives (8a-p) were designed and synthesized the Wilgerodt-Kindler reaction between 2-methylquinazoline-4-one 10 and amines using S/DMSO as the oxidizing system. Their characteristics were confirmed by IR, NMR, HRMS spectra, and their melting point. These novel derivatives (8a-p) were evaluated for their anti-inflammatory activity by inhibiting NO production in lipopolysaccharide (LPS)-activated RAW 264.
View Article and Find Full Text PDFCharacterization and application of fluorescent hydrogel films with superior mechanical properties in detecting iron(Ⅲ) ions and ferroptosis in oral cancer.
Front Bioeng Biotechnol
January 2025
Department of Orthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Research Unit of Oral and Maxillofacial Regenerative Medicine, Chinese Academy of Medical Sciences, Shanghai, China.
A one-step hydrothermal method was applied to prepare carbon dots (CDs) with superior fluorescence properties using chitosan as a carbon source. The as-prepared carbon dots were then grafted onto a sodium alginate-gelatin hydrogel film to form a fluorescent hydrogel film (FHGF), emitting at 450 nm under excitation of 350 nm light. In comparison to the CDs, the fluorescence intensity of this film was maintained over 90.
View Article and Find Full Text PDFFacile Access to Highly Efficient 3D Printing Using Robust Self-Healing CDs/Polymer Hybrids.
ACS Appl Mater Interfaces
January 2025
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing 210009, P. R. China.
3D printing efficiency, as a key indicator of additive manufacturing technology, directly affects its competitiveness in rapid prototyping, small batch production, and even large-scale industrial applications. Compared with traditional manufacturing methods, the high efficiency of 3D printing is often considered a bottleneck, hindering its application across various fields. Herein, a versatile and efficient strategy is proposed, namely, the dimensional reduction printing (DRP) process, to break the obstacle of high efficiency of 3D printing.
View Article and Find Full Text PDFIn this study, three distinct hydrogen bonding (HB) states of tetrahydrofuran (THF)-aqueous solutions at varying concentrations were characterized and analyzed using Raman spectroscopy coupled with two-dimensional correlation Raman (2D-COS) analysis. Specifically, in the range of 10%≤N≤ 30%, the solution exhibits cluster structures characterized by free THF-5HO and THF-4HO tetrahedral configurations; in the range of 40%≤N≤ 70%, the cluster structures within the solution consisted of THF·2HO and THF·HO configurations, following the fragmentation of tetrahedral structures; in 80%≤N the disruption of the tetrahedral structure of water enters the second stage, resulting in the formation of 2THF·HO and low-dimensional self-aggregated structures of THF. Combined with density functional theory, a further discussion on the changes in bond lengths and bond angles was conducted.
View Article and Find Full Text PDFMetabolic profiles and potential antioxidant mechanisms of hawk tea.
Sci Rep
January 2025
Department of Food Science and Engineering, Moutai Institute, Renhuai, 564502, People's Republic of China.
Hawk tea has received increasing attention for its unique flavor and potential health benefits, with antioxidant function being one of its significant bioactivities. However, the metabolic profiles, potential antioxidant components, and action mechanisms of different types of hawk tea are still unclear. In this study, the chemical components of five hawk teas were determined using untargeted metabolomics.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!