CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Ziheng Bai,Qi Liu,Hongsen Zhang,Jingyuan Liu,Jing Yu,Jun Wang
Plenty of uranium resources were consumed with the development of nuclear energy. Therefore, the effective collection of uranium resources has been received much focus. It is well known that the amount of uranium resources in the seawater is abundant. However, the extremely low concentration of U(VI) and complex environments pose are considerable challenges for the extraction of uranium. Herein, the polyethylenimine (PEI) and Guanidineacetic acid (GDAC) were covalently grafted onto the surface of the hemp fibers (HF) to prepare a novel 3D reticular anti-fouling green adsorption material. Subsequently, a series of adsorption batch experiments were performed to evaluate the performance of the adsorbent. The experimental results showed that the maximum adsorption capacity of HF-PEI-GDAC is 414.93 mg/g. Meanwhile, the adsorbent exhibited great adsorption properties in simulated seawater. In addition, the adsorbent still presents excellent resistance to the algae adhesion after 15 days. Therefore, the HF-PEI-GDAC can be considered as a highly promising adsorbent for the extraction of U(VI) from seawater.
研究领域:
材料科学
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环境科学
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 6
·3469-3483
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IF 4.21
Wan Caiyan,Zhang Guangxian,Zhang Fengxiu
Abstract A novel reactive N–P flame retardant ammonium salt of guanidine acetate tetramethylenephosphonic acid (AGATMPA) with good solubility was synthesized under mild conditions. AGATMPA was combined with cotton cellulose through P–O–C and C–O–C covalent bonds. The molecular structure of AGATMPA was characterized by 1 H NMR, 13 C NMR, and 31 P NMR. The control cotton and treated cotton were characterized by FT-IR, SEM, and EDX to verify that the flame retardant was successfully grafted onto the cotton fabric. The LOI and vertical flammability tests indicated that the AGATMPA-treated cotton showed outstanding flame retardance with LOI of 45.5% and durability with LOI of 29.5% after 50 laundering cycles, respectively. TG analysis showed that treated cotton exhibits favorable thermal and thermal oxidation stability, and the carbon residual can reach 42.26% in nitrogen and 12.55% in air at 700 °C. Cone calorimetry suggested that the PHRR and THR values of treated cotton decreased by 95.18% and 70.07%, respectively. TG-IR results revealed that the amount of thermally-degraded volatiles of treated cotton decreased and no new types of toxic gases were produced, compared with control cotton. XRD results showed little change in the crystalline region of the cotton fabric before and after treatment with AGATMPA. The flame retardant finishing process has some effect on the physical properties of cotton fabric while only slightly influencing its application. Graphic abstract
研究领域:
材料科学
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纺织工程
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化学工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Jun Ma,Hang Xu,Meng Zhang,Jingjun Wang,Tao Lin,Hui Tao
Nanofiltration (NF) membranes hold promise for energyefficient liquid separation, but achieving high permeance and precise separation membrane via a facile approach remains a great challenge. Herein, we introduce guanidinoacetic acid (GAA) as an economical additive to modify interfacial polymerization (IP) for high-performance NF membranes. Comprehensive characterizations and simulations revealed that GAA regulates the IP process through two mechanisms: (1) modulation of piperazine (PIP) diffusion kinetics at the aqueous–organic interface and (2) covalent incorporation of GAA that triggers in situ modification within the polyamide (PA) layer. This controlled diffusion and reaction kinetics produced a thinner, more electronegativity PA layer with an optimized microstructure. Benefiting from these optimized physicochemical properties, the GAA-functionalized membranes exhibit a 2.3-fold increase in water permeance compared to conventional NF membranes, while maintaining high Na 2 SO 4 rejection (>98.5 %) and excellent removal efficiency for organic micropollutants. Moreover, the modified membranes achieve superior ion selectivity, particularly for the separation of Ca 2+ /SO 4 2− , surpassing the state-of-the-art PA-based NF membranes. The incorporation of GAA presents a rational design paradigm for engineering selective layers in NF membranes, thereby advancing the prospects of NF technology for sustainable water purification.
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高影响因子
TENSIDE SURFACTANTS DETERGENTS
·
2021
·Vol. 58
·期 3
·187-194
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IF 1.049
Yongbo Song,Yulan Niu,Hongyan Zheng,Ying Yao
The interactions between cocopropane bis-guanidinium acetates, tallowpropane bis-guanidinium acetates with bovine serum albumin (BSA) in an aqueous solution were studied by fluorescence and circular dichroic spectroscopy measurements. The aim of the study was to elucidate the influence of the hydrophilic group and the length of the hydrophobic chain of these surfactants on the mechanism of binding to BSA. The results revealed that for both surfactants, at low concentrations, the Stern–Volmer plots had an upward curvature and at high concentrations, the quenching efficiency was decreased with increase in surfactant concentration. Different thermodynamics parameters demonstrated the existence of hydrogen bond and van der Waals force which acting as binding forces. Static quenching was observed among the protein and surfactant. The conformation of BSA was changed at higher surfactant concentrations as shown by synchronous fluorescence and CD spectroscopy. This work reveals the mechanism and binding characteristics between guanidine surfactants and protein, and provided the basis for further applications of surfactants.
研究领域:
生物化学
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分子生物学
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DOI
高影响因子
CRYSTAL GROWTH & DESIGN
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2024
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IF 3.2
Wenyao Zhang,Zichen Li,Xudong Leng,Qun Jing,Qiao Wen
The development of efficient methods for producing novel birefringent materials has become a significant and urgent undertaking. Herein, we propose to use organic units as a structural guide to obtain organic–inorganic hybrid structures, where oxyfluoride units are used to optimize the arrangement of organic motifs, resulting in an enhanced optical anisotropy of the structure. Two novel C(NH2)3+-containing oxofluorovanadates, [C(NH2)3]3V2O4F5 (Gu3V2O4F5) and [C(NH2)2NHCH2COOH]2VOF5 (guanidinoacetic acid-VOF5, GA2VOF5) with dimensions up to 5 × 4 × 0.1 and 5 × 3 × 1 mm3, have been successfully designed and grown via facile reactions. Remarkably, Gu3V2O4F5 features an optimized two-dimensional (2D) van der Waals layer structure. It shows a birefringence of 0.35 at 546 nm (cal.); this is larger than most previously reported birefringences of C(NH2)3+-based organic–inorganic compounds. Additionally, it possesses an ultraviolet cutoff edge. GA2VOF5 is the first GA-containing oxofluorovanadate with a birefringences of 0.066 at 546 nm (cal.), which was verified experimentally. Theoretical calculations show that the remarkable birefringence observed in the title compounds primarily arises from the incorporation of π-conjugated units and [VOxF6–x] (x = 1 and 2) groups. Our study further confirms the effectiveness of structural optimization in the design and engineering of structural-driven functional materials.
研究领域:
材料科学
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光学
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化学
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DOI
高影响因子
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
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2024
·Vol. 38
·期 17
·1-1572
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IF 1.8
Yunpeng Bai,Yuming Zou,Yingjia Zeng,Linhui Hu,Sumei Huang,Kunyong Wu,Qingxia Yi,Jingchun Chen,Guowu Liang,Yingbang Li,Wendong Huang,Chunbo Chen
Rationale Because acute kidney injury (AKI) is closely related to poor prognosis in critically ill patients, developing biomarkers for its prediction and early diagnosis is particularly important. Endogenous guanidino compounds (GCs) and ureido compounds (UCs) can participate in various biochemical processes because of their important physiological activities. The aim of this study was to investigate the alteration profiles of urinary GCs/UCs as potential biomarkers in patients with cardiac surgery–associated acute kidney injury (CSA-AKI) at different stages. Methods GCs/UCs were reacted with benzil via benzylic rearrangement, and their derivatives were used to investigate fragmentation mechanisms using tandem mass spectrometry (MS/MS) in positive ion mode. Furthermore, a high-performance liquid chromatography (HPLC)–MS/MS method was developed to measure the concentrations of GCs/UCs in urine samples taken from patients with CSA-AKI at different time points. Results MS/MS analysis in positive ion mode showed that benzylic GCs/UCs exhibited similar fragmentation processes, which could produce the characteristic ion (C 13 H 12 N + ) at m/z 182.0. Furthermore, an obviously different fragmentation pattern of benzylic UCs in the positive ion mode might be due to the neutral loss of the H 2 CO 2 group under low collision energy. Of the eight selected GCs/UCs, methylguanidine exhibited significantly increased concentrations in urine when CSA-AKI occurred, whereas guanidinoethyl sulfonate (GDS), homoarginine (HArg) and homocitrulline (HCit) exhibited decreased concentrations. After recovery from AKI, the urinary concentrations of the aforementioned GCs/UCs returned to normal. Some of the aforementioned metabolites with significant changes (GDS, HArg and HCit) had large areas under the curve in the receiver operating characteristic curve for distinguishing AKI stages on the third day after surgery. Conclusions In patients with CSA-AKI, urinary GCs/UCs were significantly disrupted due to injured kidney, and some GC/UC metabolites exhibited a good ability to become potential biomarkers for AKI stages. The present study provides essential resources and new therapeutic targets for further research on CSA-AKI.
研究领域:
医学
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生物化学
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肾脏病学
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DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2019
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IF 5.839
Tong Shi,Zhiyu Xiong,Wengang Jin,Li Yuan,Quancai Sun,Yuhao Zhang,Xiuting Li,Ruichang Gao
The suppression mechanism of l -arginine (Arg) in fish myosin heat-induced aggregation was investigated in this work. The hydrodynamic radius determined by dynamic light scattering (DLS) and the turbidity of a myosin solution decreased in a dose-dependently manner with Arg after heating, especially in a solution without pH modification ( P < 0.05). The surface hydrophobicity of myosin exhibited the same trend as that for hydrodynamic radius and turbidity ( P < 0.05). The myosin secondary structures clearly changed with Arg concentration during heating ( P < 0.05). These results demonstrate that positively-charged Arg could form ionic interactions with negatively charged myosin, as well as promote repulsion between myosin molecules induced by higher pH values. Furthermore, the resultant hydrogen bonding observed indicated that, in addition to Arg having ionic linkage effects, the specific structure of Arg played an important role in the suppression of myosin aggregation. Essentially, Arg markedly disturbed the hydrogen bonds of the myosin backbone and formed new hydrogen bonds with myosin molecules via two amino groups (-NH 2 ), which are part of the guanidinium moiety of Arg, preferentially hydrogen bonding with the backbone carbonyl oxygen atoms of myosin molecules. This work provides support for using Arg as an additive to modify the texture of fish products to produce liquid and semiliquid food suitable for the elderly consumers in an aging society.
研究领域:
食品科学
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生物化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Ning Zhang,Ting Huang,Peisi Xie,Zhu Yang,Lan Zhang,Xiaoping Wu,Zongwei Cai
The flexible and controlled synthesis of metal–organic framework (MOF)-derived hybrid nanostructures is of great significance in fine tuning of their enrichment performance in large-scale and in-depth phosphoproteome analysis. Herein, a magnetic guanidyl-functionalized MOF hybrid coating with multiaffinity sites, denoted as Fe3O4@G-ZIF-8, was fast fabricated via a one-pot epitaxial growth strategy for the first time and applied for selective and highly efficient enrichment of global phosphopeptides. The intrinsic unsaturated metal sites of ZIF-8 endow the surface-mounted MOF coatings with immobilized metal ion affinity chromatography interaction with multiphosphorylated peptides. The oriented anchoring of bifunctional guanidineacetic acid on the magnetic MOF nanospheres provides additional affinity sites (guanidyl groups) for specific recognition of phosphopeptides by “salt bridge” interaction, as well as active site carboxyl groups for the coordination with the metal ions. The as-prepared Fe3O4@G-ZIF-8 exhibits large surface area (382.5 m2 g–1), good superparamagnetic property (41.6 emu g–1) and stability, and size-exclusion effect (1.73 nm), which can serve as a specific adsorbent for global phosphopeptide analysis with satisfactory selectivity, great detection sensitivity (1 fmol), and rapid magnetic separation. Moreover, the successful application of Fe3O4@G-ZIF-8 for selective capture of both multi- and mono-phosphopeptides from human saliva and serum demonstrated the great potential of magnetic surface-mounted MOF coatings in effective identification of low-abundance phosphopeptides by matrix-assisted laser desorption ionization time-of-flight mass spectrometry from complicated biological matrices.
研究领域:
分析化学
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生物医学
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材料科学
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DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2023
·
IF 8.1
Xiang Ren,Xinyu Zhang,Peizi Sun,Junxin Lin,Yuying Zhang,Dongmei Li
Antarctic krill suffers from severe water loss after heating, and its quality deteriorates, so it is in urgent need of a green and healthy improver. In this paper, the effects of L-arginine (L-Arg) soaking on the modification of the quality of heat-treated Antarctic krill and the structure of myofibrillar proteins (MPs) in Antarctic krill were investigated. The results showed that L-Arg had an ameliorating effect on heat-treated krill in a concentration-dependent relationship. The water-holding capacity of L-Arg-soaked krill was 1.41 times higher than that of sodium tripolyphosphate (STPP) at an equivalent concentration (80 mM). At 120 mM L-Arg soaked, L * and hardness of krill decreased to 58.31 and 334.81 g, while resilience and moisture content increased to 0.47 and 85.29% after heating, respectively. The scanning electron microscopy (SEM) results revealed that the tissue state of the pH-corrected groups was better than the control, but not as well as that of the pH-uncorrected groups. pH and the guanidinium group in L-Arg both played roles in promoting the transition of MPs from disordered to ordered secondary structures. This transition reduced the exposure of hydrophobic and sulfhydryl groups in MPs, inhibited the protein aggregation and increased the solubility of MPs to 71.61%, which ultimately improved the quality of heat-treated krill. It is worth noting that the pH effect had a primary influence on the observed effects, while the guanidinium group made a secondary contribution. These results could broaden the potential application of L-Arg as an improver of the quality of heat-treated krill.
研究领域:
食品科学
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蛋白质化学
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海洋生物学
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DOI
PubMed
高影响因子
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