ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2017
·Vol. 25
·期 4
·3922-3932
·
IF 2.741
Yi Xiaofeng,Yang Meixia,Mo Liuda,Xu Wenkai,Wang Shuai,He Jiarui,Gu Junjie,Ou Minrui,Xu Xiaoping
Copper in drinking water causes a significant environmental problem. Composite material based on alginate hydrogel has been gaining attention in the field of Cu(II) adsorption. However, alginate-based hydrogel exhibits poor mechanical property and relative low adsorption capacity which limit their application. The present study is devoted to the modification of chitosan/calcium alginate/Fe 3 O 4 (CAF) hydrogel microsphere by NaOH solution for enhancement of Cu(II) adsorption. Results reveal that modification of CAF via NaOH solution significantly improves the mechanical strength and Cu 2+ adsorption capacity of pristine materials. FTIR and XRD analysis confirms that CAF and newly prepared materials (NACAF) are successfully prepared. SEM and EDX are employed to analyze the surface morphology and elemental composition, respectively, both before and after their loading with Cu 2+ . XPS study demonstrates adsorption mechanism is based on chelation and ion-exchange. Compressive stress-strain curves demonstrate NACAF has better mechanical performance than CAF. The adsorption kinetics of the two adsorbents follow a pseudo-second-order model. The equilibrium data were best described by Langmuir isotherm model, and the estimated maximum equilibrium sorption capacity, q
m ,is 261.31 mg/g for the NACAF, which is larger than that of CAF (145.39 mg/g). Hence, NACAF shows excellent mechanical strength and high sorption capacity for Cu 2+ . It has great potential for Cu(II) removal in aqueous solutions.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Feixiang Gao,Jianwei Bai,Junqing Li,Huijun Yan,Shouzheng Su,Chunhong Zhang,Jun Wang
The development of high-efficiency adsorbents for rapid recovery of uranium from wastewater and seawater is considered an important condition for the sustainable development of nuclear energy. Herein, polyamidoxime (PAO) was introduced into a novel Artemisia sphaerocephala Krasch. gum -polyvinyl alcohol gel system, and ASKG-PVA/PAO gel membrane was prepared by crosslinking and membrane laying. Due to the high swelling capacity of ASKG, PAO chain is fully exposed, and ASKG-PVA/PAO membrane shows excellent uranium adsorption capacity of 681.20 mg·g −1 (pH = 6). The introduction of ASKG greatly improve the adsorption rate of the membrane, and the adsorption process reach equilibrium within 60 min (1/6 of original material). The static adsorption process conforms to the second-order kinetics and Langmuir model. X-ray photoelectron spectroscopy analysis shows that the strong coordination of N and O in amidoxime group is the main reason for uranium adsorption. ASKG-PVA/PAO membrane has great potential as uranium adsorbent due to its fast and efficient adsorption, easy separation and good recycling performance.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2015
·
IF 2.858
Jing-jing Rong,Ming Liang,Feng-qi Xuan,Jing-yang Sun,Li-jun Zhao,Hui-zhen Zhen,Xiao-xiang Tian,Dan Liu,Quan-yu Zhang,Cheng-fei Peng,Tian-ming Yao,Fei Li,Xiao-zeng Wang,Ya-ling Han,Wei-ting Yu
To date, transcatheter arterial embolization (TAE) has become a standard treatment to control intracavitary bleeding as an alternative to surgery. Due to excellent biocompatibility and no residual in vivo , biodegradable materials are preferred in TAE. However, gelfoam is the only commercially available biodegradable embolic material used to treat blunt trauma of solid abdominal viscera until now, and controversial on its stability and reliability never stopped in the past five decades. In this study, a new biodegradable macromolecule material (thrombin-loaded alginate-calcium microspheres, TACMs) was prepared using electrostatic droplet techniques and a special method was developed for hemostatic embolization. Thrombin was successfully loaded into microspheres with high encapsulation efficiency and drug loading capacity. A burst release of TACMs was observed at early stage and sustained release later on, with the activity of thrombin preserved well. The strength of TACMs mixed thrombus, which was used as embolic agent, increased in a dose-dependent manner after TACMs were added. In addition, the TACMs were verified to be of no cytotoxicity and systemic toxicity, and biodegradable in vivo . Finally, the results of preliminary applications revealed that the TACMs could serve as an effective and promising embolic material for blunt trauma and hemorrhage of solid abdominal viscera.
研究领域:
医学
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生物材料学
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DOI
PubMed
高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2023
·Vol. 46
·期 8
·1175-1194
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IF 3.8
Liu Siyuan,Liu Wei,Yin Hao,Yang Chunyan,Chen Jianxin
This work focused on the development of an inexpensive carbon source and the improvement of the fermentation-foam fractionation coupling system. The rhamnolipids production capacity of waste frying oil (WFO) was evaluated. The suitable bacterial cultivation of seed liquid and the addition amount of WFO was 16 h and 2% (v/v), respectively. A combined strategy of cell immobilization and oil emulsion avoid cell entrainment inside foam and improves the oil mass transfer rate. The immobilization conditions of bacterial cells into alginate-chitosan-alginate (ACA) microcapsules were optimized using the response surface method (RSM). Under the optimal conditions, rhamnolipids production using batch fermentation with immobilized strain reached 7.18 ± 0.23% g/L. WFO was emulsified into a fermentation medium using rhamnolipids as emulsifier (0.5 g/L). By monitoring dissolved oxygen, 30 mL/min was selected as a suitable air volumetric flow rate for fermentation-foam fractionation coupling operation. The total production and recovery percentage of rhamnolipids were 11.29 ± 0.36 g/L and 95.62 ± 0.38%, respectively. Graphical abstract
研究领域:
生物技术
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环境工程
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化学工程
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DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
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2024
·
IF 11
Biyang Zhu,Siyu Guo,Peter Chi-Keung Cheung,Kseniya Hileuskaya,Lijun You
Probiotics as pharmaceutical and nutraceutical products are essential to human health, whereas maintaining their viability in adverse environments remains an obstacle. This study presents a well-designed W 1 /O/W 2 emulsion system incorporated in calcium-alginate hydrogel particles for the targeted delivery and sustained release of Lactobacillus bulgaricus in the gastrointestinal tract. Firstly, the degraded fucoidan (DF) with the highest carboxyl content (2.99%), prepared using UV/H 2 O 2 treatment, was more favorable for forming DF-CS nanogel through ionic cross-linking with chitosan (CS). The W 1 /O/W 2 double emulsion fabricated by 0.4 mg/mL DF-CS nanogel possessed the highest interface stability, as concluded from visual appearance, confocal laser scanning microscope (CLSM), droplet size distribution, and ζ-potential results. The double emulsion loaded in 2% alginate hydrogel showed desirable textural properties and swelling behavior, thereby offering a high encapsulation efficiency of Lactobacillus bulgaricus (74.5%). Additionally, the hydrogel delivery system not only achieved sustained release of Lactobacillus bulgaricus in the simulated gastrointestinal condition (>10 7 CFU/g) but also maintained at least 71.3% and 55.1% survival of probiotics at −20 °C and 4 °C, respectively, after 28 d of long-term storage. Overall, these W 1 /O/W 2 double emulsion-filled multilayer self-assembled hydrogel particles can be utilized for better protection and delivery of probiotics in the food and pharmaceutical industries.
研究领域:
食品科学
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生物工程
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药剂学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 36
·
IF 1.866
Jiangquan Liu,Xiaoguang Ying,Hongxun Wang,Xiao Li,Weiying Zhang
Polyethylene glycol grafted calcium alginate hydrogel microspheres are synthesized by ring-opening and addition reaction of epoxy chloropropane. FTIR, 13 C NMR, optical microscope, SEM, TG, and DSC are used for characterization. Swelling behaviors are studied and it is found that polyethylene glycol grafted calcium alginate microspheres are improved in anti-swelling properties. Protein-imprinted polyethylene glycol grafted calcium alginate hydrogel microspheres exhibit enhanced specific rebinding quantity (11.16 mg/g) and selective recognition properties (4.71 against BHb), towards target molecule in the presence of competing protein, compared with that of the unmodified samples (4.96 mg/g and 1.75, respectively). © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43617.
研究领域:
材料科学
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生物化学
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DOI
高影响因子
Crystals
·
2019
·Vol. 9
·期 5
·255
·
IF 2.061
Niannian Yang,Runkai Wang,Pinhua Rao,Lili Yan,Wenqi Zhang,Jincheng Wang,Fei Chai
Calcium alginate (CA) beads as a green sorbent were easily fabricated in this study using sodium alginate crosslinking with CaCl2, and the crosslinking pathway was the exchange between the sodium ion of α-L-guluronic acid and Ca(II). The experimental study was conducted on Cu(II), Cd(II), Ni(II) and Zn(II) as the model heavy metals and the concentration was determined by inductively coupled plasma optical emission spectrometry (ICP-OES). The characterization and sorption behavior of the CA beads were analyzed in detail via using scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The adsorption experiments demonstrated that the CA beads exhibited a high removal efficiency for the selective adsorption of Cu(II) from the tetra metallic mixture solution and an excellent adsorption capacity of the heavy metals separately. According to the isotherm studies, the maximum uptake of Cu(II) could reach 107.53 mg/g, which was significantly higher than the other three heavy metal ions in the tetra metallic mixture solution. Additionally, after five cycles of adsorption and desorption, the uptake rate of Cu(II) on CA beads was maintained at 92%. According to the properties mentioned above, this material was assumed to be applied to reduce heavy metal pollution or recover valuable metals from waste water.Keywords:alginate beads;green sorbent;selective adsorption;heavy metals
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wenbin Liu,Yiwei Huang,Guolin Huang,Lijiao Fan,Yuming Xie,Qin Zhang,Jeffery Shi
Uranium is both an important resource and an environmental hazard. It is vital to separate/enrich uranium from liquid for energy production as well as for environmental protection. Herein, the amidoxime-functionalized mesoporous silica/calcium alginates (Al/MS-AO) were synthesized by co-condensation and post-gluing process. The morphology and the characteristics of the Al/MS-AO were studied by using Scanning electron microscope (SEM), energy dispersive spectrometer (EDS), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), N 2 adsorption–desorption and X-ray photoelectron spectroscopy (XPS). These analyses have also revealed the in-depth information of the materials including function groups, structure, and Uranium adsorption mechanism. Batch experiments were conducted, and the results suggest that the adsorption of uranium by Al/MS-AO is a spontaneous and endothermic process. This process can be described with the combination of a pseudo second order kinetic model and a Langmuir isotherm model. The maximum adsorption capacity achieved is 328.68 mg·g −1 . Three possible adsorption mechanisms are proposed, which involve the chemical chelation of the N and O atoms of amidoxime.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 3.978
Jinqiong Wang,Yi Xie,Jie Hou,Xinyu Zhou,Jing Chen,Changhong Yao,Yongkui Zhang,Yonghong Li
The wide application of biodegradation technology makes it particularly significant to use immobilized microorganisms to achieve continuous degradation of pollutants. In this study, the performance of Ca-alginate (CA) immobilized Phanerochaete chrysosporium beads in a consecutive biocycle treatment of bisphenol A (BPA) effluent was researched. The effects of initial BPA concentration, biomass dosage, pH and curing time were investigated. Results showed that CA-immobilized P. chrysosporium can be successive cycle at least 9 times (12 h each), and each time the removal efficiency of BPA reached 100%. The degradation process of BPA in the treatment process was investigated. According to the analyses of glucose, ammonia nitrogen, total nitrogen, extracellular proteins and biomass, it was found that consumed carbon and nitrogen sources were used for the rapid growth of fungal hyphae and the synthesis of a series of proteins. These extracellular proteins can be utilized as a nitrogen source by P. chrysosporium , and played a key role in the removal of BPA. Biodegradation process followed the pseudo-first-order kinetics. Moreover, intermediates in the BPA degradation process were identified by gas chromatography-mass spectrometry (GC–MS) and liquid chromatography-mass spectrometry (LC-MS), and three possible degradation pathways were proposed. This strategy presented in the study provides a convenient and efficient biological method for the continuous treatment of BPA effluent.
研究领域:
环境科学
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微生物学
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DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2016
·
IF 3.902
Yang Hu,Shanshan Ma,Zhuohong Yang,Wuyi Zhou,Zhengshan Du,Jian Huang,Huan Yi,Chaoyang Wang
In this study, we develop a facile one-pot approach to the fabrication of poly(L-lactic acid) (PLLA) microsphere-incorporated calcium alginate (ALG-Ca)/hydroxyapatite (HAp) porous scaffolds based on HAp nanoparticle-stabilized oil-in-water Pickering emulsion templates, which contain alginate in the aqueous phase and PLLA in the oil phase. The emulsion aqueous phase is solidified by in situ gelation of alginate with Ca 2+ released from HAp by decreasing pH with slow hydrolysis of d -gluconic acid δ-lactone (GDL) to produce emulsion droplet-incorporated gels, followed by freeze-drying to form porous scaffolds containing microspheres. The pore structure of porous scaffolds can be adjusted by varying the HAp or GDL concentration. The compressive tests show that the increase of HAp or GDL concentration is beneficial to improve the compressive property of porous scaffolds, while the excessive HAp can lead to the decrease in compressive property. Moreover, the swelling behavior studies display that the swelling ratios of porous scaffolds reduce with increasing HAp or GDL concentration. Furthermore, hydrophobic drug ibuprofen (IBU) and hydrophilic drug bovine serum albumin (BSA) are loaded into the microspheres and scaffold matrix, respectively. In vitro drug release results indicate that BSA has a rapid release while IBU has a sustained release in the dual drug-loaded scaffolds. In vitro cell culture experiments verify that mouse bone mesenchymal stem cells can proliferate on the porous scaffolds well, indicating the good biocompatibility of porous scaffolds. All these results demonstrate that the PLLA microsphere-incorporated ALG-Ca/HAp porous scaffolds have a promising potential for tissue engineering and drug delivery applications.
研究领域:
生物材料学
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组织工程学
·
药物递送系统
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 14
·16745-16753
·
IF 3.056
Yu Cheng,Zhang Yi,Fang Yu,Tan Yujie,Dai Ke,Liu Shilin,Huang Qiaoyun
Shewanella oneidensis MR-1 (MR-1)-impregnated alginate capsules with 3D porous structure were prepared through cation crossing-linking and was used for the Cr(VI) reduction and removal. After being encapsulated by alginate, the endurance of the MR-1 was largely enhanced under conditions of high Cr(VI) concentrations (up to 4 mM) and low pH (pH 5). The Cr(VI) reduction over the MR-1-impregnated alginate capsules could be fitted by pseudo first-order kinetic model. With the Cr(VI) initial concentration increasing from 1 to 4 mM, the first-order rate constant for the encapsulated MR-1 ( k capsules ) and free cells ( k cells ) fell by 26.3% and 82.4%, respectively. At pH 5, the k capsules value was 0.19 h − 1 , which was about 3.7 times higher than k cells . Moreover, the encapsulated MR-1 held 90.5% of the Cr(VI) reduction ability after 15 days of resting time, while the free MR-1 held 19.7%. After bioreduction, 73.6% of total chromium was adsorbed on the MR-1 impregnated Ca-alginate capsules. XPS results showed 85% of the adsorbed chromium was Cr(III). The mechanism for chromium removal over the MR-1-impregnated Ca-alginate capsules was proposed with the following steps: (1) Cr(VI) was bioreduced via the encapsulated MR-1; (2) the reduced soluble Cr(III) was adsorbed by alginate selectively. In the study, the Ca-alginate shell of the cabbage-like MR-1 impregnated capsules could be a shelter for encapsulated MR-1 to endure unfavorable conditions (e.g., low pH and high concentration of Cr(VI)) and immobilize the soluble chromium. Considering the obtained capsules derived from biomolecules were environment-friendly, the MR-1-impregnated Ca-alginate capsules were potential for the application in the remediation of environmental pollution.
Graphical abstract
研究领域:
环境科学
·
微生物学
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DOI
高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 21
·2763-2768
·
IF 2.378
Zengjin Li,Beibei Zhu,Xinrui Duan,Wei Tang
Glucose is a metabolic intermediate of living cells. Tumor cells exploit anaerobic glycolysis for their energy needs and cause a greater glucose consumption than that is observed in normal tissue. Therefore, the detection and imaging of glucose levels in tumor tissues serves as an effective method for the detection and staging of tumors. Peroxyoxalate chemiluminescence (POCL) shows high sensitivity and selectivity toward hydrogen peroxide (H2O2), which offers a high imaging specificity for H2O2 and glucose in tumor, as glucose can react with the dissolved oxygen to produce H2O2 in the presence of glucose oxidase (GOx). Herein, we reported a simple POCL–GOx–alginate/Ca gel system to detect and image the local concentration of glucose in the tumor periphery. We constructed nanoparticles enwrapping rubrene and CPPO as a CL nanoreactor and mixed with GOx. Then, alginic acid sodium salt solution was added to form a POCL–GOx–alginate solution. When Ca2+ was added into this solution, alginate could gelate to render the POCL-NPs/GOx to gather around the tumor and prevent the nanoparticles from dispersing. When glucose permeated into this POCL–GOx–alginate/Ca gel system, it was oxidized by GOx and H2O2 was produced. Then, H2O2 ignited the CPPO/rubrene nanoreactor, and the CL intensity was observed immediately. Our results showed that this POCL–GOx–alginate/Ca gel system could quantitatively detect glucose in vitro and successfully be applied for the in vivo imaging of the local glucose concentration in a tumor-bearing mouse. Our strategy had a high signal-to-noise ratio because of the high efficiency of the oxidation of GOx due to the abundant supply of oxygen in tumor periphery and the gathering of CL reactors by alginate/Ca gel network. Owing to the high biological safety of alginate, this simple and low-cost CL/gel system has a potential to be used as a partial alternate for FDG-PET in clinical diagnose. Furthermore, this CL nanoparticle–oxidase enzyme–alginate/Ca gel system provides a platform for the in situ imaging of substrates of other oxidase enzymes in vivo.
研究领域:
生物医学工程
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肿瘤学
·
成像技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）