Materials Science & Engineering C-Materials for Biological Applications
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2020
·
IF 5.88
Liwei Sun,Lingjie Song,Xu Zhang,Rongtao Zhou,Jinghua Yin,Shifang Luan
Pathogenic bacterial infections associated with wound healing progress usually result in serious complications. Herein, biocompatible and antimicrobial electrospun nanofibrous mats with photodynamic therapy (PDT) effect were fabricated to accelerate the infected wound healing. The nanofibrous mats were fabricated by co-electrospining of polyanionic poly(γ-glutamic acid) (γ-PGA) and cationic photosensitizer 5,10,15,20-tetrakis(1-methylpyridinium-4-yl)porphyrin tetra (p-toluenesulfonate) (TMPyP) in aqueous solution and stabilized by the chemical crosslinking. The as-prepared nanofibrous mats can not only confer the moist microenvironment to the wound bed, but also provide potent bactericidal activity upon visible light irradiation by releasing the cytotoxic reactive oxygen species (ROS). The antibacterial assay in vitro showed that they can effectively eradicate the board-spectrum bacteria at a relatively low loading dose of TMPyP ( e.g. , 0.1 wt%). Meanwhile, those nanofibrous mats showed good biocompatibility with no obvious adverse effects on mammalian cells and red blood cells (RBCs). The animal test in vivo suggested that the restrained inflammatory reaction and better wound healing could be achieved upon timely and effective antibacterial treatment with negligible local toxicities. This biocompatible and antibacterial γ-PGA-TMPyP nanofibrous mat may show great potential in practical infection-resistant applications, particularly for wound dressing applications.
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Catalysts
·
2025
·Vol. 15
·期 6
·530
·
IF 4
Yalin Guo,Zhuang Ma,Binbin Jin,Limin Ma,Guodong Yao
The sustainable valorization of lignocellulosic biomass into high-value platform chemicals presents a crucial pathway for reducing reliance on fossil resources. Gamma (γ)-valerolactone (GVL) has gained recognition as a versatile bio-derived compound with broad applications in renewable energy systems and green chemical synthesis. While conventional GVL production strategies from carbohydrate biomass typically depend on noble metal catalysts paired with high-pressure hydrogen gas, these approaches face substantial technical barriers including catalyst costs, hydrogen storage requirements, and operational safety concerns in large-scale applications. This work develops an innovative catalytic system utilizing earth-abundant iron for in situ hydrogen generation through water splitting, integrated with Raney Ni as the hydrogenation catalyst. The designed two-stage process enables direct conversion of cellulose—first through acid hydrolysis to levulinic acid (LA) followed by catalytic hydrogenation to GVL without intermediate purification. Through systematic parameter optimization, a remarkable 61.9% overall GVL yield from cellulose feedstock was achieved. Furthermore, the methodology’s versatility was demonstrated through wheat straw conversion experiments, yielding 24.6% GVL. This integrated methodology explores a technically feasible pathway for direct cellulose-to-GVL conversion utilizing abundant water as the hydrogen source, effectively overcoming the critical limitations associated with conventional hydrogenation technologies regarding hydrogen infrastructure and process safety.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Kun Zhou,Deliang Yin,Chen Liu,Rongguo Sun
Farmland mercury (Hg) pollution poses a significant threat to human health, but there is a lack of highly efficient phytoextraction for its remediation at present. This study investigates the impact of poly-γ-glutamic acid (γ-PGA) on the phytoextraction capabilities of Pennisetum giganteum ( P. giganteum ) in Hg-contaminated soil. Our research indicates that amending γ-PGA to soil markedly enhances the assimilation of soil Hg by P. giganteum and transformation of Hg within itself, with observed increases in Hg concentrations in roots, stems, and leaves by 1.1, 4.3, and 18.9 times, respectively, compared to the control. This enhancement is attributed to that γ-PGA can facilitate the hydrophilic and bioavailable of soil Hg. Besides, γ-PGA can stimulate the abundance of Hg-resistance bacteria Proteobacteria in the rhizosphere of P. giganteum , thus increasing the mobility and uptake of soil Hg by P. giganteum roots. Moreover, the hydrophilic nature of Hg-γ-PGA complexes supports their transport via the apoplastic pathway , across the epidermis, and through the Casparian strip , eventually leading to immobilization in the mesophyll tissues. This study provides novel insights into the mechanisms of Hg phytoextraction, demonstrating that γ-PGA significantly enhances the effectiveness of P. giganteum in Hg uptake and translocation. The findings suggest a promising approach for the remediation of Hg-contaminated soil, offering a sustainable and efficient strategy for environmental management and health risk mitigation.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Xinyu Wang,Mingyang Hu,Yun Liu
This study investigates a one-step process for the simultaneous separation of cellulose, hemicellulose, and lignin from lignocellulosic biomass using γ-valerolactone (GVL)/H 2 O pretreatment, which also converts hemicellulose to furfural (FF). A response surface methodology (RSM) was applied to optimize the process parameters. Under optimal conditions (163 °C for 1.5 h), the maximum FF yield reached 85.36 %, and cellulose purity was 80.80 %. The extracted GVL-lignin was characterized as low-molecular-weight guaiacyl-syringyl (G-S) type nanospheres with significant antioxidant activity. The conversion of hemicellulose to FF was enhanced by the synergistic interaction of Lewis acid (MgCl 2 ) and Brønsted acid (H 2 SO 4 ), which promoted the isomerization of xylose and dehydration to FF. The high-purity cellulose yielded 18.87 g/L ethanol through separate hydrolysis and fermentation (SHF), 27 times higher than untreated solids. Additionally, GVL exhibited consistent performance in lignocellulose separation after six cycles. This method offers an efficient and sustainable approach to valorize lignocellulosic biomass, advancing the production of high-value products.
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JOURNAL OF ORGANIC CHEMISTRY
·
2025
·
IF 3.6
Mengxuan Bai,Xuetong Zhang,Shengxin Zhang,Caicai Zhang,Zhiqiang Hao,Jin Lin
γ-Amino alcohol is of great importance, as a broad number of bioactive and pharmaceutical alcohols contain this motif. Herein, a selective formal anti-Markovnikov hydroamination of allyl alcohols to access γ-amino alcohols has been achieved by using NNN-pincer Ru complexes. The electronic effect of the catalysts is critical for their catalytic performance. A wide substrate scope (65 examples) and up to 96% yields were achieved at low catalyst loadings via a borrowing hydrogen (BH) process in one pot. This protocol was easily extended to the hydroamination of both primary and secondary allyl alcohols and applications for the synthesis of drug derivatives.
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MATERIALS RESEARCH BULLETIN
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2025
·
IF 5.7
Shuaida Song,Jie Zhao,Xiangjie Duan,Na Zhou,Jizhuang Fan,Bo Tian,Yunchen Du
Polymer-based composites attract increasing attention for γ-ray shielding because of their light weight, flexibility, and easy processing. In this study, tungsten carbide–carbon (WCC) with dual-scale characteristics, composed of ultrafine WC 1-x nanoparticles (3–4 nm) anchored on micrometer-scale carbon scaffolds, is incorporated into a polypropylene (PP) matrix to develop high-performance shielding materials. WCC possessing combined micro– and nano-scale features effectively mitigates nanoparticle agglomeration and enhances radiation attenuation across a wide energy range. Among the prepared composites, WCC45PP (45 wt % WCC) exhibits a linear attenuation coefficient ( μ L ) of 3.597 cm -1 and a radiation protection efficiency (RPE) of 48.3 % at 59.6 keV, while also showing superior mechanical and thermal stability compared with the composite containing commercial WC. These results indicate that WCC with dual-scale characteristics provides an effective strategy for designing lightweight, flexible, and lead-free polymer composites for γ-ray shielding applications.
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CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Xuebin Ma,Tingting Xu,Wei Chen,Hongye Qin,Bo Chi,Zhiwen Ye
Injectable hydrogels have great potential in minimally invasive delivery. In this work, novel injectable hydrogels were prepared via self-crosslinking of aldehyde hyaluronic acid (HA-CHO) and hydrazide-modified poly (γ-glutamic acid) (γ-PGA-ADH) for proteins delivery. The HA/γ-PGA hydrogels could be formed in situ as fast as 9s with high swelling ratios. Rheological properties illustrated a wide processing range and good mechanical properties, which were reflected by broad linear viscoelastic region and higher threshold shear stress ( σ c ) and storage modulus ( G′ ). Meanwhile, the gelation time, swelling ratio, rheological properties, as well as the protein release behavior could be modulated conveniently. Bovine serum albumin (BSA) was designed as a model drug to study the release behavior. We found that the release mechanisms were either diffusion or Case-II relaxation depending on the different hydrogel components. The HA/γ-PGA hydrogels also showed good biocompatibility. Therefore, the HA/γ-PGA hydrogels have great potential as promising injectable biomaterials for controlled protein delivery.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Penghui Wang,Wenjie Zhang,Rong Yang,Shuai Liu,Yanhan Ren,Xin Liu,Xiaoyan Tan,Bo Chi
For the problems in the research on differentiation of mesenchymal stem cells (BMSCs), such as poor differentiation tendency and low differentiation efficiency, a novel photo-crosslinked extracellular matrix (ECM) inspired double network hydrogel that composed of poly(γ-glutamic acid) (γ-PGA) hydrogel and Fe 3+ ligand coordination was designed and manufactured. Compared with those traditional γ-PGA based hydrogels, the introduction of Fe 3+ significantly enhanced the mechanical properties of the hydrogel and accelerated the chondrogenesis efficiency of BMSCs chondrogenesis. The experimental results confirmed that the mechanical properties of hydrogel enhanced by the introduction of metal ions Fe 3+ could promote BMSCs proliferation, induce cartilage-specific gene expression, and increase secretion of hydroxyproline (HYP) and glycosaminoglycan (GAG). As a result, this method could promote chondrogenic differentiation of BMSCs, accelerate the regeneration of cartilage, and was prospective to be conducive to the research work of cartilage defect repair. Thus, the mechanically enhanced γ-PGA hydrogel scaffold by Fe 3+ could mediate BMSCs differentiation and provide a scientific and theoretical basis for research and development of biomedical materials on cartilage tissue engineering field.
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Food Bioscience
·
2023
·
IF 5.2
Han Hu,Caiyun Wu,Fanglan Ge,Yao Ren,Wei Li,Jiao Li
Soybean meal (SBM), a high-protein animal feed, contains several anti-nutritional factors, which limit its utilization. Poly-γ-glutamic acid (γ-PGA), a biological macromolecule , can significantly improve the health and growth benefits of animal feed. However, there are rare reports about SBM fermentation with γ-PGA-producing bacteria to improve its nutritional quality . In this study, we isolated a glutamic acid-independent poly γ-glutamic acid (γ-PGA) producing Bacillus velezensis SCP024–S-4 bacterial strain and used it for solid fermentation of SBM. The results showed that the maximum γ-PGA yield in fermented soybean meal (FSBM) reached up to 89.64 g/kg without adding glutamic acid . Meanwhile, the content of proteins, free amino acids and small peptides increased by 12.83%, 347.96 μg/g and 108.11 mg/g, respectively. Soy globulin, β-conglutinin and trypsin inhibitor all decreased below 3 mg/g. Mice were fed with CK (control diet), SBM and FSBM respectively. The average daily food intake in the FSBM, SBM, and CK groups were 7.68, 5.25, and 6.36 g, respectively. Compared with the CK group, the mice weight growth rate was significantly higher in the FSBM group. Mice blood and spleen tests showed no negative effect of FSBM. The high-throughput sequencing of mice intestinal microflora indicated that FSBM increased the richness of intestinal microbiota ; especially, the types and quantities of Lactobacillus were significantly increased. This study provides a feasible strategy to improve the nutritional quality of SBM as an animal feed.
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OZONE-SCIENCE & ENGINEERING
·
2025
·
IF 1.4
Zhibo Liu,Jing Zhang,Jingcheng Wei,Bingyan Zhu,Tingfeng Xue,Xiaofu Li,Liwei Pan
To address the challenges posed by highly toxic and recalcitrant compounds in phenol-containing wastewater, a novel CoAl2O4/γ-Al2O3 catalyst was synthesized via an impregnation-calcination method and applied for catalytic ozonation of phenolic wastewater. The catalyst was thoroughly characterized using X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area analysis, Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma (ICP) analysis. The catalyst’s abundant Lewis acid sites act as active centers, promoting the decomposition of ozone into reactive oxygen species. This study elucidates the pathways by which the CoAl2O4/γ-Al2O3 catalyst synergistically activates O3 to generate O2·−, ·OH, and 1O2, revealing that phenol mineralization primarily proceeds through ·OH and 1O2-mediated oxidation. Compared to ozonation alone, the CoAl2O4/γ-Al2O3 catalyst demonstrates superior O3 activation capability, significantly enhancing the phenol mineralization efficiency from 13.5% to 56.5% while improving ozone utilization (mgTOCremoved/mgO3consumed) from 0.02 to 0.08. Remarkably, the catalyst maintains excellent stability over multiple reaction cycles. Toxicity evaluation confirms substantial reduction in biotoxicity of the treated wastewater. These findings collectively demonstrate that CoAl2O4/γ-Al2O3-based catalytic ozonation represents an efficient and promising technology for phenolic wastewater treatment.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 20
·14117-14123
·
IF 3.906
Jun Zhou,Yunyun Huang,Chaoyan Chen,Aoxiang Xiao,Tuan Guo,Bai-Ou Guan
Interfacing bio-recognition elements to optical materials is a longstanding challenge to manufacture sensitive biosensors and inexpensive diagnostic devices. In this work, a graphene oxide (GO) interface has been constructed between silica microfiber and bio-recognition elements to develop an improved γ-aminobutyric acid (GABA) sensing approach. The GO interface, which was located at the site with the strongest evanescent field on the microfiber surface, improved the detection sensitivity by providing a larger platform for more bio-recognition element immobilization, and amplifying surface refractive index change caused by combination between bio-recognition elements and target molecules. Owing to the interface improvement, the microfiber has a three times improved sensitivity of 1.03 nm/log M for GABA detection, and hence a lowest limit of detection of 2.91 × 10−18 M, which is 7 orders of magnitude higher than that without the GO interface. Moreover, the micrometer-sized footprint and non-radioactive nature enable easy implantation in human brains for in vivo applications.
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Crystals
·
2026
·Vol. 16
·期 11
·683
·
IF 2.9
Lan Cheng,Tianwen Zhang,Yu Fang
Electrochemical conversion of chloride to active chlorine is promising for treating chloride-rich organic wastewater, but enhanced oxidant production does not necessarily improve electrical efficiency. Here, Ti–Sn–Sb@γ-Al2O3particle electrodes were prepared and applied in a flow-through three-dimensional electrocatalytic oxidation (3DEO) system. Modification promoted chlorine evolution while suppressing oxygen evolution. Active chlorine production showed diminishing gains above 30 mA/cm2and 10 g/L Cl−, whereas increasing flow rate improved production and reduced specific energy consumption. An 80% particle filling ratio provided the highest average generation rate. Initial pH (3–11) had limited influence because the solution became alkaline during electrolysis. For simulated aniline wastewater, 3DEO with NaCl achieved 95.20% aniline and ~47% total organic carbon (TOC) removal, compared with 77.33% aniline removal in the two-dimensional system. Specific energy consumption was ~110 Wh/g TOC, versus 1070 Wh/g with Na2SO4, while TOC-based current efficiency increased from ~11% to ~75%. The laboratory results demonstrate aniline and partial TOC removal. Chlorinated organic by-products and chlorate were not quantified, so effluent safety and practical applicability remain unverified.
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