JOURNAL OF ANALYTICAL CHEMISTRY
·
2020
·Vol. 75
·期 3
·330-342
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IF 0.84
Haishuang Jia,Liu Wenfang,Li Na,Wang Jun,Song Youtao
Abstract Two novel methods for spectrophotometric determination of Cu 2+ ion using synthesized and characterized furfuraldehyde fluorescein diacetate hydrazone ( FFDH ) and furfuraldehyde fluorescein hydrazone ( FFH ) have been proposed. Addition of Cu 2+ to FFDH and FFH solutions results in a rapid color change from colorless to dark yellow. Experimental results show that FFH and FFDH both can provide a rapid, selective and sensitive response to Cu 2+ within a linear dynamic range of 7–33 µM and the detection limits of 1.1 × 10 –7 and 7 × 10 –8 M, respectively. Apparently, the detection limit of FFDH is lower than that of FFH, which indicates that FFDH forms a more stable complex with Cu 2+ . In addition, the detection of Cu 2+ in water samples was also studied; as a result, the developed FFDH was found to be more applicable than FFH for spectrophotometric determination of Cu 2+ in environmental water samples. Particularly, as a lipid chemical compound, FFDH may be transported across the cell membrane to detect Cu 2+ in vivo. It is of great significance in many fields, such as biology, biochemistry, medicine and environment.
研究领域:
分析化学
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环境科学
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生物化学
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DOI
高影响因子
Journal of Energy Chemistry
·
2015
·
IF 2.352
Wenfei Hu,Yan Zhang,Yizheng Huang,Jiaxi Wang,Jin Gao,Jie Xu
Glycerol can be obtained as a by-product during biodiesel manufacture. It is important to convert glycerol to value-added products. Glycerol esterification with acetic acid is one of the most promising approaches for glycerol utilization. It is usually difficult to obtain diacetin with good activity and selectivity. In this work, glycerol esterification with acetic acid over different metal oxides , such as Bi 2 O 3 , Sb 2 O 3 , SnO 2 , TiO 2 , Nb 2 O 5 and Sb 2 O 5 , was investigated. It was found that in the six investigated metal oxides, only Sb 2 O 5 resulted in good activity and selectivity to diacetin. Under the optimized conditions, the glycerol conversion reached 96.8%, and the selectivity to diacetin reached 54.2%, while the selectivity to monoacetin and triacetin was 33.2% and 12.6%, respectively. The catalysts were characterized with FT-IR spectra of adsorbed pyridine , which indicated that in the six investigated metal oxides, only Sb 2 O 5 possessed Brønsted acid sites strong enough to protonate adsorbed pyridine. The good catalytic activity and selectivity to diacetin might be mainly attributable to the Brønsted acid sites of Sb 2 O 5 . Reusability tests showed that with Sb 2 O 5 as catalyst, after six reaction cycles, no significant change in the glycerol conversion and the selectivity to diacetin was observed.
研究领域:
化学工程
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催化剂科学
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DOI
高影响因子
Gels
·
2021
·Vol. 7
·期 4
·210
·
IF 4.702
Shixian Xiong,Yangbiao Hu,Sizhao Zhang,Yunyun Xiao,Zhengquan Li
Cellulose and its derivative aerogels have attracted much attention due to their renewable and biodegradable properties. However, the significant shrinkage in the supercritical drying process causes the relatively high thermal conductivity and low mechanical property of cellulose and its derivatives aerogels. Considering the pearl-necklace-like skeleton network of silica aerogels, which can improve thermal insulation property and mechanical property. Herein, we propose a new strategy for fabricating cellulose diacetate aerogels (CDAAs) with pearl-necklace-like skeletons by using tert-butanol (TBA) as exchange solvent after experiencing the freezing-drying course. CDAAs obtained have the low density of 0.09 g cm−3, the nanopore size in the range of 10–40 nm, the low thermal conductivity of 0.024 W m−1K−1at ambient conditions, and the excellent mechanical properties (0.18 MPa at 3% strain, 0.38 MPa at 5% strain). Ultimately, CDAAs with moderate mechanical property paralleled to cellulose-derived aerogels obtained from supercritical drying process are produced, only simultaneously owning the radial shrinkage of 6.2%. The facile method for fabricating CDAAs could provide a new reference for constructing cellulose/cellulose-derived aerogels and other biomass aerogels.Keywords:cellulose diacetate;aerogels;freezing drying;pearl-necklace-like skeletons
研究领域:
材料科学
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生物质材料
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DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 15
·期 1
·143
·
IF 4.967
Shiyou Zhao,Jin Li,Lifeng Wu,Ming Hua,Changmei Jiang,Ying Pan,Lirong Yao,Sijun Xu,Jianlong Ge,Gangwei Pan
Cellulose diacetate (CDA) and L-lactide (L-LA) were used to prepare CDA−g−PLLA with a low glass transition temperature under different process conditions. Given the high glass transition temperature (Tg) of CDA, the thermal processing performance of CDA is poor, which greatly limits its application fields. To decrease the Tgof CDA, graft copolymerization was used in this research. A CDA−g−PLLA graft copolymer was synthesized by grafting CDA with L-LA under different reaction conditions using stannous octanoate as the catalyst and variations in the grafting rate under different reaction conditions were compared. The chemical structure and crystal structure of the CDA−g−PLLA were investigated, and thermal properties were also studied. The results showed that the grafting rate was the highest at the L-LA/CDA mass ratio of 4:1 under a reaction temperature of 150 °C for 90 min, and no poly-L-lactide (PLLA) homopolymer was found among the CDA−g−PLLA graft copolymers after purification. The Tgof CDA−g−PLLA was 54.2 °C, and the initial temperature of weightlessness of CDA−g−PLLA was 218.7 °C. The regularity of the original CDA molecular chains was destroyed after grafting PLLA molecular chains. In this research, we investigated the optimal grafting conditions for CDA−g−PLLA and the CDA−g−PLLA had a low Tg, which improves the thermal processing performance of CDA and broadens its application prospects in the industry.Keywords:cellulose diacetate;grafting rate;process condition;polylactide;thermal processing temperature
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Fu Li,Pengfei Fei,Bowen Cheng,Jianqiang Meng,Liang Liao
In order to improve the antibacterial efficiency and spectrum of cellulose acetate reverse osmosis membrane (CA–RO), both quaternary ammonium and bromoacetyl groups were introduced into cellulose diacetate under mild conditions forming CA–RO with bi-antibacterial groups for seawater desalination. Bromoacetyl bromide and a series of tertiary amine were chosen as the modification agents respectively. The characterization results showed that both two antibacterial groups were successfully introduced with a certain density. The obtaining membrane had a less hydrophilic but more electronegative surface as well as improved mechanical property. The flux values increased firstly and decreased subsequently after twice modifications while the salt rejection rose. The membrane modified with N,N- dimethyloctylamine (DMOA) had the optimal comprehensive performance of flux and salt rejection. The antibacterial testing results indicated that the resulting RO membranes showed high antibacterial efficiency and broad-spectrum. Their bactericidal rates against gram-negative Escherichia coli ( E. coli ) and gram-positive Staphylococcus aureus ( S. aureus ) were more than 99.9%.
研究领域:
材料科学
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环境工程
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生物学
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DOI
PubMed
高影响因子
JOURNAL OF FLUORESCENCE
·
2015
·Vol. 26
·期 2
·451-457
·
IF 1.927
Liu Cui,Zhou Zhen,Zou Linling,Cao Yuan-Cheng,Liu Jun’An,Lin Yongjun
A highly sensitive transgenic protein analysis method was proposed here based on fluorescein diacetate (FDA). First, FDA was prepared by the ball mill to harvest the nano-sized organic particles. Further examines showed that the FDA size can be controlled by the speed of centrifugation which can obtain FDA in well-distributed size. Cy3 antibody immobilization tests showed that the proteins can attach onto the FDA particles while keep bioactivities. FDA and Cry1Ac antibody immunoassay tests showed that when the FDA particle was in 150 nm, the linear range was 0.01 ng/L-30 μg/mL. And it has the lower detection limitation of 0.01 ng/L, which is 100 times more sensitive than the ELISA methods. These results indicate that the FDA related immunoassays are the promising approach in the transgenic analysis.
研究领域:
生物化学
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分子生物学
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食品科学
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DOI
PubMed
高影响因子
JOURNAL OF PESTICIDE SCIENCE
·
2025
·
IF 1.8
Menghan Li,Longfei Jin,Bin Liu,Yifang Qian,Haofu Hu,Xin Wang,Yang Zhang,Wenping Xu
Emulsifiable concentrates and oil suspensions are typical pesticide formulations. Many pesticides on the market use aromatic hydrocarbons as solvents. However, studies have revealed their potential risks to humans and the environment. Ethylene glycol diacetate (EGDA) is a low-toxicity and eco-friendly solvent with low utilization in pesticides. This study explores EGDA’s potential to replace xylene. Results indicate that EGDA formulations enhance droplet adhesion to leaves, boosting pesticide efficiency. They exhibit lower surface tension and contact angles, with a 24%–40% increase in leaf retention. Bioassays show that 15% cyhalofop-butyl EC and 10% nicosulfuron OF with EGDA offer weed control that is superior to xylene-based formulations by 9.1%–30.5% in greenhouses and 4.8%–6.7% in fields. Xylene preparations are 2–3 times more cytotoxic to human bronchial cells than EGDA-based ones. Thus, EGDA is a promising pesticide solvent, outperforming traditional aromatic solvents in environmental friendliness and reducing adverse effects.
研究领域:
农业科学
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环境科学
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毒理学
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DOI
PubMed
高影响因子
Gels
·
2024
·Vol. 10
·期 3
·210
·
IF 5
Sizhao Zhang,Kunming Lu,Yangbiao Hu,Guangyu Xu,Jing Wang,Yanrong Liao,Shuai Yu
The inherent characteristics of cellulose-derived aerogels, such as their natural abundance and environmental friendliness, make them highly interesting. However, its significant shrinkage before and after the supercritical drying procedure and low mechanical strength limit its potential application. Here, we propose a strategy to prepare cellulose diacetate aerogels (CDAAs) with low drying shrinkage, exceptional thermal insulation, and superior mechanical strength. The low drying shrinkage (radial drying shrinkage of 1.4%) of CDAAs is attributed to their relative strong networking skeletons, which are greatly formed by tert-butanol solvent exchange in exerting the interaction of reducing the surface tension force. In this case, CDAAs are eventually endowed with the low bulk density of 0.069 g cm−3as well. Additionally, as-prepared CDAAs possess an abundant three-dimensional networking structure whose pore size is concentrated in the diameter range of ~50 nm, and the result above is beneficial for improving the thermal insulation performance (thermal conductivity of 0.021 W m−1K−1at ambient environmental and pressure conditions). On the other hand, the optimal compressive stresses of CDAAs at 3% and 5% strain are 0.22 and 0.27 MPa respectively, indicating a mechanically well robustness. The above evidence demonstrates indeed the exceptional thermal insulation and superior compressive properties of CDAAs. This work may provide a new solution for developing a kind of high-performance cellulose-derived aerogel in the future.
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
PubMed
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Tingting Wang,Huizhen Ke,Shiping Chen,Jian Wang,Wushi Yang,Xiuming Cao,Jingyan Liu,Qufu Wei,Reza A. Ghiladi,Qingqing Wang
Motivated by the need for self-disinfecting materials that can be used to reduce the surface transmission of harmful microbes to healthy hosts, here we prepared a photodynamic antimicrobial membrane comprised of electrospun cellulose diacetate (CA) microfibers into which the photosensitizer protoporphyrin IX (PpIX) was in situ embedded. The resultant porous PpIX-embedded CA (PpIX/CA) microfibrous membranes were prepared with two different photosensitizer loadings: 5 and 10 wt% PpIX with respect to CA (85 and 170 nmol PpIX/mg membrane, respectively). The singlet oxygen ( 1 O 2 ) generated by the embedded photosensitizer was confirmed by electron paramagnetic resonance spectroscopic studies through generation of the TEMPO radical, and its photooxidation efficiency was further investigated using potassium iodide as a model substrate. Antibacterial photodynamic inactivation studies showed that the PpIX/CA membrane achieved a 99.8% reduction in Gram-positive S . aureus after illumination (Xe lamp, 65 ± 5 mW/cm 2 , λ ≥ 420 nm; 30 min), with a lower level of reduction (86.6%) for Gram-negative E . coli . Potentiation with potassium iodide was found to be an effective way to further enhance the antimicrobial efficacy of the PpIX/CA microfibrous membrane, achieving 99.9999% (6 log units) inactivation of both S . aureus and E . coli in the presence of 25 and 100 mM KI, respectively. These findings indicate that the electrospun CA microfibrous membrane is an ideal matrix for a photosensitizer such as PpIX to be embedded and effectively sensitized upon visible light illumination, and its antimicrobial photodynamic inactivation efficiency could be strongly enhanced with the increased KI addition, showing a promising future for its use in pathogen transmission defensive materials.
研究领域:
材料科学
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微生物学
·
光动力疗法
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Ziming Zhao,Yanzhu Guo,Tao Zhang,Jiliang Ma,Haiming Li,Jinghui Zhou,Zhiwei Wang,Runcang Sun
As one type of the solid wastes, the increasing contamination of waste cellulose diacetate (CDA) from discarded cigarette filters is a growing problem worldwide. Finding a facile and suitable approach to convert the CDA into value-added materials is of significance. Herein, we reported a green, simple and effective method to reuse CDA as precursor for preparing fluorescence N-doped carbon dots (N-CDs) via one-pot hydrothermal carbonization in aqueous solution with low-cost ammonium hydroxide as the passivation agent. The N-CDs showed a quantum yield up to 22.4% with a maximum emission at 415 nm and excitation at 320 nm. Interestingly, the N-CDs exhibited high selectivity toward tetracycline (TC) as their fluorescence was obviously quenched by TC as a result of inner-filter effect. A linear relationship was fabricated over concentration range of 0–80 μM with a detection limit of 0.06 μM. Moreover, the N-CDs could also be applied as fluorescent ink for anti-forgery.
研究领域:
环境科学
·
材料科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Frontiers of Materials Science
·
2022
·Vol. 16
·期 2
·1-15
·
IF 2.612
Xiao Chuang,Zhang Ge,Liang Wencheng,Wang Zhaochuang,Lu Qiaohui,Shi Weibin,Zhou Yan,Guan Yong,Lang Meidong
Managing wounds is a growing universal problem and developing effective wound dressings to staunch bleeding and protect wounds from bacterial infections is an increasingly serious challenge. In this work, a remolding electrospinning nanofiber three-dimensional structure wound dressing (CCP) was prepared with superhydrophilicity, high water absorption and absorbing capacity, excellent hemostatic capacity and antibacterial ability, and biocompatibility to promote wound healing. Polyhexamethylene guanidine hydrochloride (PHMG) was grafted to cellulose diacetate (CDA) wound dressing surface through an amide reaction. A water contact angle analysis demonstrated that CCP wound dressing could be beneficial to promote wound exudate management effectively with rapid absorption of water within 0.2 s. In vitro hemo- and cytocompatibility assay showed that a CCP wound dressing had no significant hemotoxicity or cytoxicity. Specifically, CCP wound dressings could be beneficial to accelerate wound hemostasis and further reduce mortality caused by uncontrolled bleeding. Furthermore, CCP wound dressings have an excellent antibacterial ability, which could be beneficial to inhibit wound inflammatory over-reaction and promote normal wound healing. Combined together, the prepared wound dressing in this research effort is expected to have high-potential in clinical applications.
研究领域:
生物材料学
·
医学工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Wei Chen,Yan Ding,Fang Wang,Zhixia Xu,Qing Ye,Jinlong Li,Patrice Paricaud
The vapor-liquid equilibria of binary mixtures of ethylene glycol diacetate (EGDA) + o-chlorotoluene (OCT) and EGDA + cyclohexylbenzene (CHB), and the liquid-liquid equilibria (LLE) in ternary mixtures of ethylene glycol (EG) + EGDA + o-chlorotoluene and EG + EGDA + cyclohexylbenzene are measured in this work. The new data have been described with the NRTL thermodynamic model. The heterogeneous extractive distillation and liquid-liquid phase separation process for the investigated systems are then simulated using the Aspen Plus software and the adjusted thermodynamic model. The influence of key process parameters such as the ratio of solvent flow rate to feed flowrate, the plate number and the reflux ratio on the separation process are analyzed in detail, and the optimal process parameters are determined. An economic and environmental study of the process is then performed. It is found that the two extractants (o-chlorotoluene and cyclohexylbenzene) can achieve a good EG + EGDA azeotrope separation. The purities of both EG and EGDA products are greater than 99.50 wt% in the two processes. The predicted selectivity obtained with o-chlorotoluene is higher than the one obtained with cyclohexylbenzene process. However, the cyclohexylbenzene process is found to be was more environmentally friendly, and the utility costs and CO 2 emissions of are lower. This work brings new insights in the design and optimization for the separation of EG and EGDA azeotropic mixtures.
研究领域:
化学工程
·
过程系统工程
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热力学
·
环境工程
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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）