Carbohydrate Polymer Technologies and Applications
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2025
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IF 6.5
Yunning Yang,Chen Song,Xiaona Sun,Zhejin Chen,Tong Wu,Chunqing Ai,Fanhua Kong,Shuang Song
Although nuclear magnetic resonance (NMR) spectroscopy is a powerful analytical tool, obtaining high-resolution NMR spectra of some high-molecular-weight and viscous polysaccharides remains challenging. Partial degradation could facilitate polysaccharides for NMR analysis, but potential composition alterations raise concerns, especially for sulfated polysaccharides. To explore the applicability of degradation approaches for sulfated polysaccharides, the present study compared outcomes of acid (HCl) and photoelectrocatalysis pretreatments for depolymerizing 2 representative sulfated polysaccharides, carrageenan and fucoidan. The results revealed that 1 M HCl at 100 °C could efficiently depolymerize carrageenan to 20 kDa within 30 min and fucoidan to 30 kDa within 10 min, but destruct more than half of sulfated polysaccharides. In contrast, photoelectrocatalysis could generate low-molecular-weight products while preserving structure blocks. Notably, both depolymerization pretreatments could facilitate sulfated polysaccharides for NMR analysis and enhance the spectral resolution. However, HCl tended to produce mono- and oligo-saccharides thereby affecting NMR spectra, while 50-min and 60-min photoelectrocatalysis treatments were suitable for carrageenan and fucoidan, respectively, to improve their NMR spectra without signal alterations. Therefore, the present study demonstrated photoelectrocatalysis depolymerization as a potential pretreatment for sulfated polysaccharides to facilitate their NMR analysis.
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TALANTA
·
2017
·
IF 4.162
Ting Li,Yong Liao,Xiaoyan Jiang,Di Mu,Xiandeng Hou,Chunchun Zhang,Pengchi Deng
The chemical shifts of several important endogenous phosphorus compounds under different pH conditions were explored, including adenosine-5′-triphosphate, adenosine-5′-diphosphate, adenosine-5′-monophosphate, phosphorylcholine and phosphorylethanolamine. Their 31 P NMR and 1 H NMR chemical shifts were all pH-sensitive in the similar pH range. Two dimensional (2D) 1 H– 31 P NMR spectra were found helpful to identify these endogenous phosphorus markers in biological samples from rather complicated NMR spectra. Herein, for the first time, a pH sensor based on 2D 1 H– 31 P NMR was established and applied to biological samples analysis with pH values determined in good agreement with those by potentiometric method . Apart from being simple, green, rapid and less sample-consuming, information concerning both the endogenous phosphorus markers and pH status could be attained in a single NMR run, which demonstrated the great potential of this method in rare sample analysis and even disease diagnosis.
研究领域:
生物化学
·
医学诊断
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Chengyong Gao,Xueni Hou,Tieling Xing,Guoqiang Chen
The water retention of printing inks is of the utmost importance. According to low -field nuclear magnetic resonance (LF-NMR) to detect the behavior of polyols and water, polyols with excellent water retention performance can be selected quickly. The water retention of disperse ink is closely related to the intramolecular/intermolecular forces of each component in the disperse ink. The relationship between each component of the ink is revealed by LF-NMR. The water retention of ink was also evaluated by LF-NMR. Therefore, the LF-NMR was able to design ink formulation and evaluate ink quality. Compared with NNO and TD-1109, Surfynol CT-136 had a higher grinding efficiency for disperse dyes. The physicochemical properties of disperse ink was evaluated to meet the requirements of inkjet printing ink. The rheological properties of the disperse inks were characterized by rotary rheometer, which were confirmed as Newtonian fluid ; The quality of the ink-jet printing pattern is closely related to the ink jet performance. The formation process of the ink droplet and the parameters of the ink droplets were observed by the ink droplet observer. The ink has excellent jetting properties and a high-quality print pattern at an appropriate viscosity (3.1 mPa.s) and surface tension (34.2 mN/m). The excellent affinity between NVP/VA copolymer (NVP/VA64) and disperse dyes was confirmed by ultraviolet spectrophotometer (UV spectrophotometer). The scanning electron microscope (SEM) images of printed fabrics show that there is a film on the surface. The NVP/VA copolymer can be used as a carrier for disperse dye to improve the fixation and fastness of disperse dye in polyester fabrics.
研究领域:
材料科学
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化学工程
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ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Xu-Dong Gao,Yue Hu,Wei-Feng Wang,Xiao-Bo Zhao,Xin-Zhen Du,Yan-Ping Shi
Ribose plays an important role in the process of life. Excessive ribose in the human cerebrospinal fluid or urine can be used as an early diagnostic marker of leukoencephalopathy. Fluorinated phenylboronic acid combined with 19F NMR spectroscopy was a powerful method for molecular recognition. However, phenylboronic acid-based sensors for selective detection of ribose are rarely reported in the literature. In this study, the rapid and highly selective recognition of ribose was studied by 19F NMR and 2-fluorophenylboric acid. It was found that 2-fluoro-phenylboric acid was an appropriate 19F NMR-based sensor molecule for the determination of ribose under physiological conditions with high selectivity and robust anti-interference ability. When 2-fluorophenylboric acid was used for the detection of ribose in human urine without any sample pretreatment, a limit of detection of 78 μM was obtained at room temperature under given 19F NMR experimental conditions (400 MHz, 512 scans, ca. 12 min), which can well meet the needs of practical application.
研究领域:
分析化学
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生物化学
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医学诊断
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JOURNAL OF MAGNETIC RESONANCE
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2022
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IF 2.734
Xue Yang,Kai-Rui Hu,Jia-Xiang Xin,Yu-Xiao Li,Guang Yang,Da-Xiu Wei,Ye-Feng Yao
Selectively probing specific molecules in complex mixtures with nuclear magnetic resonance promises new insights into molecular structures or molecular interaction. Such a study often can be further facilitated when two or more objects in chemical moieties of interest can be precisely targeted. Herein, we proposed a novel method to implement the multiple-targeting signal selection by optimal control of the spin singlets of two or more targeted spin systems from one or more molecules. This method can endow the conventional nuclear magnetic resonance (NMR), magnetic resonance image (MRI) and magnetic resonance spectrum (MRS) with the multiple-targeting signal selectivity to selectively probe several targeted molecules and/or chemical groups simultaneously.
研究领域:
化学
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物理学
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FOOD CHEMISTRY
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2022
·
IF 9.231
Hongtu Qiu,Kexin Qu,Hua Zhang,Jong-Bang Eun
In this study, 1 H nuclear magnetic resonance was used to track the evolution of oxidation products of different multi-element oleogels (DMEOs) during temperature-accelerated oxidative degradation. The nutritional properties of the DMEOs were also indirectly explored. Oleogels prepared using sitosterol/lecithin oleogelator showed higher nutritional properties than those prepared using carnauba wax or ethyl cellulose oleogelators. Only a small amount of primary oxidation product hydroxide, (Z,E)-conjugated dienic systems, and (E,E)-conjugated dienic systems were produced from all oleogels upon accelerated oxidation. Furthermore, no 1 H signal peaks of secondary oxidation products, such as aldehydes or ketones, were detected. However, very small amounts of primary alcohols (−CH 2 OH–), secondary alcohols (−CHOH–), and epoxides were identified. Moreover, resveratrol loading and surfactant addition effectively stabilized the internal structure and unsaturated fatty acid acyl content of the oleogels.
研究领域:
食品科学
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分析化学
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Membranes
·
2022
·Vol. 12
·期 2
·107
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IF 4.562
Shukun Wei,Yaqing Yang,Yuan Yuan,Lingyu Du,Hongjuan Xue,Bo OuYang
The gaseous plant hormone ethylene influences many physiological processes in plant growth and development. Plant ethylene responses are mediated by a family of ethylene receptors, in which the N-terminal transmembrane domains are responsible for ethylene binding and membrane localization. Until now, little structural information was available on the molecular mechanism of ethylene responses by the transmembrane binding domain of ethylene receptors. Here, we screened different constructs, fusion tags, detergents, and purification methods of the transmembrane sensor domain of ethylene receptors. However, due to their highly hydrophobic transmembrane domain (TMD), only a KSI-fused LeETR21–131from tomato yielded a good-quality nuclear magnetic resonance (NMR) spectrum in the organic solvent. Interestingly, a dimer model of LeETR21–131built by the AlphaFold2 algorithm showed greatly converged structures. The interaction analysis of ethylene and LeETR21–131using molecular docking and molecular dynamics (MD) simulations demonstrated the potential binding sites of ethylene in LeETR21–131. Our exploration provides valuable knowledge for further understanding of the ethylene-perception process in ethylene receptors.Keywords:LeETR2;AlphaFold2;membrane protein expression;solution NMR;organic solvent;molecular docking;molecular dynamics simulation
研究领域:
植物生物学
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结构生物学
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生物化学
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ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Kaixu Jin,Caipeng Xu,Yufen Zhao,Songsen Fu
Accurately determining the concentration and redox ratio of iron ions is crucial in fields such as biogeochemistry and environmental chemistry. While current NMR relaxometry-based methods are lauded for their simplicity and speed, they face challenges when paramagnetic matrices are present. This study overcomes this limitation by leveraging the redox sensitivity of iron ions. By using appropriate redox reagents and pH conditions, seamless transitions between Fe2+ and Fe3+ are achieved without altering the valence states of other common paramagnetic metals. The significant difference in the relaxometry rates of water protons induced by Fe2+ and Fe3+ enables a strong linear relationship across a concentration range of 0 to 500 μM, with a detection limit of less than 1 μM. The established standard curves were effectively applied to determine the redox ratio and total iron concentration in both artificial and real samples, validated by X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma-optical emission spectrometry (ICP-OES) analyses. Furthermore, the method demonstrates resistance to interference from common ligands, suggesting its promising potential for analyzing biological and food samples.
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Journal of Physical Chemistry C
·
2016
·
IF 4.509
Ruili Zhang,Marcos de Oliveira,Zaiyang Wang,Roger Gomes Fernandes,Andrea S. S. de Camargo,Jinjun Ren,Long Zhang,Hellmut Eckert
The structure of glasses in the systems (100 – x)B2O3–xPbF2 (x = 30, 40, and 50) and 50B2O3–(50 – x)PbO–xPbF2 (x = 5, 10, 15, 20, 25, 30, 35, 40, and 45) has been studied by solid state NMR and EPR spectroscopies. On the basis of 11B and 19F high resolution solid state NMR as well as on 11B/19F double resonance results, we develop a quantitative structural description on the atomic scale. 19F NMR results indicate a systematic dependence of the fluoride speciation on PbF2 content: At low x-values, F– ions are predominantly found on BO3/2F– units, whereas, at higher x-values, fluoride tends to be sequestrated into amorphous domains rich in PbF2. In addition, both pulsed EPR studies of Yb3+ doped glasses and photophysical studies of Eu3+ doped samples indicate a mixed fluoride/borate coordination of the rare-earth ions and the absence of nanophase segregation effects.
研究领域:
材料科学
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玻璃化学
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光谱学
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固体物理
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无机化学
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Journal of Physical Chemistry C
·
2020
·
IF 4.189
Xuyang Zhang,Lili Hu,Jinjun Ren
The detailed local structures of fluoroborosilicate glasses with the compositions of (50 + x)SiO2–(20 – x)B2O3–10Na2O–10NaF–10YF3 (x = 0, 5, 10, 15 mol %) were investigated by advanced one- and two-dimensional solid-state nuclear magnetic resonance (SSNMR) techniques. The borosilicate glass network is characterized by 29Si and 11B magic angle spinning NMR (MAS NMR) spectra. 29Si MAS spectra show that the silicate network strengthens with the decrease of the B2O3 content. Two three-coordination boron species (B(3)-ring, B(3)-nonring) and two four-coordination boron species (BO4, BO3F) are observed in the 11B MAS spectra. The two types of B(4) species are identified by 11B triple-quantum magic angle spinning (TQMAS) and J-coupling-based 11B{19F} heteronuclear multiple quantum coherence (J-HMQC) methods. The F– species are confirmed by 19F MAS spectra and a 19F{23Na} rotational echo double resonance (REDOR) method, revealing the existence of Na–F–B and multiple Na–F–Y linkages. The clustering of F– ions is proved by 19F static spin echo results, which indicate that B3+ ions have a dispersive effect on F– ions. 11B/23Na REDOR results show that the distribution of Na+ around B(3) and B(4) is similar, and independent of the content of B2O3. On the basis of these results, a quantitative atomic structure evolution with glass compositions is investigated.
研究领域:
材料科学
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物理学
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ACS Omega
·
2025
·
IF 4.3
Yujie Wen,Fang Wang,Heqing Zhu,Changju Yang,Xiaokang Ke,Wei Li,Hua Huo,Luming Peng
Noble metal oxides are highly valuable and act as a key component of metal-oxide interfaces in oxide-supported noble metal catalysts, which play a crucial role in modern industrial society. Here, we investigate the structure of four common and stable noble metal oxides using 17O solid-state NMR. The optimal isotopic labeling temperature ensures the highest labeling efficiency while preserving the structure of the oxides. The variation in characteristic signals for each noble metal oxide reveals oxygen species in different chemical environments, while the NMR parameters related to chemical shift anisotropy and quadrupolar interaction obtained from spectral fitting indicate more structural information. DFT calculations are used to assist spectral assignments for various oxygen species. This work serves as a prerequisite for studying solid-state NMR of oxide-supported noble metal catalysts.
研究领域:
材料科学
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物理化学
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Mengdi Guo,Zhibin Yi,Huo Li,Yang Liu,Liping Ding,Sergey P. Babailov,Chunhong Xiong,Ganhui Huang,Jinsheng Zhang
Detecting harmful pathogens in food is not only a crucial aspect of food quality management but also an effective way to ensure public health. In this paper, a complete nuclear magnetic resonance biosensor based on a novel gadolinium (Gd)-targeting molecular probe was developed for the detection of Salmonella in milk. First, streptavidin was conjugated to the activated macromolecular polyaspartic acid (PASP) via an amide reaction to generate SA–PASP. Subsequently, the strong chelating and adsorption properties of PASP toward the lanthanide metal gadolinium ions were exploited to generate the magnetic complex (SA–PASP–Gd). Finally, the magnetic complex was linked to biotinylated antibodies to obtain the bioprobe and achieve the capture of Salmonella. Under optimal experimental conditions, the sensor we have constructed can achieve a rapid detection of Salmonella within 1.5 h, with a detection limit of 7.1 × 103 cfu mL–1.
研究领域:
食品安全
·
生物医学工程
·
分析化学
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高影响因子
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