HYDROMETALLURGY
·
2017
·
IF 2.605
Licheng Zhang,Lijuan Li,Dong Shi,Xiaowu Peng,Fugen Song,Feng Nie,Wensheng Han
Lithium recovery from alkaline brines by counter-current method using β-diketone was investigated. By comparing effect of different co-extractants and diluents on lithium extraction, HBTA-TOPO-kerosene system was determined as the extraction system. In extraction process, 0.4 mol/L HBTA and 0.3 mol/L TOPO in kerosene performed as extractant and three theoretical stages were required to reach 95% extraction according to McCabe Thiele diagram. 1 mol/L HCl and 3 mol/L HCl solution were used as scrubbing agent and stripping agent respectively. In regeneration stage, 2 mol/L NaOH was used as regeneration agent to remove free acid entrained in organic phase and exchange H + of hydroxyl. Bench experiments indicated that the respective number of extraction, scrubbing, stripping and regeneration were 3, 1, 2 and 1 stage. A 7-stage extraction process was conducted in a mixer-settler for 30 h to reach stable state, average extraction rate of lithium was 96% and lithium concentration in stripping solution was 15 g/L. Concentration of impurity ions in stripping liquor was < 1 g/L. No third phase or emulsification was observed during the operation. In summary, HBTA-TOPO-kerosene extraction system was verified an effective method to recovery lithium from alkaline brine.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2018
·Vol. 71
·期 6
·449-454
·
IF 1.059
Fu-Rong Zeng,Qi-Lin Zhu,Zi-Long Li
Post-polymerization modification is a facile and efficient method for the generation of diverse functional polymers. Herein, polymer-based molecular arrays were obtained by using sequential modification. First, periodic polyketone P0 was synthesized via acyclic diene metathesis (ADMET) polymerization of α,ω-diene M0. Oxime chemistry was employed in the functionalization of the ketone moieties of P0 using three commercially available alkoxyamine hydrochlorides. Finally, electrophilic alkoxyetherification, a four-component reaction, was employed in the modification of alkene groups on polymer main chains using N-bromosuccinimide (NBS), tetrahydrofuran, and fluorinated carboxylic acid. Complete conversion of reactive sites was observed in both steps, and the two modification reactions exhibited excellent compatibility. The thermal properties of the polymers as thermal stability, and glass transition and melting behaviours were investigated by thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC).
研究领域:
材料科学
·
有机化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2020
·
IF 6.793
Ye Tian,Dianzhen Yu,Na Liu,Yan Tang,Zheng Yan,Aibo Wu
Mycotoxins are toxic fungal metabolites, contaminating cereal grains in field or during processing and storage periods. These environmental contaminants pose great threats to humans and animals’ health due to their toxic effects. Type A trichothecenes, fumonisins and fusaric acid (FA) are commonly detected mycotoxins produced by various Fusarium species. Trichoderma spp. are promising antagonists in agriculture for their activities against plant pathogens , and also regarded as potential candidates for bioremediation of environmental contaminants. Managing toxigenic fungi by antagonistic Trichoderma is regarded as a sustainable and eco-friendly strategy for mycotoxin control. However, the metabolic activities of Trichoderma on natural occurring mycotoxins were less investigated. Our current work comprehensively explored the activities of Trichoderma against type A trichothecenes, fumonisins and FA producing Fusarium species via co-culture competition and indirect volatile assays. Furthermore, we investigated metabolism of type A trichothecenes and FA in Trichoderma isolates. Results indicated that Trichoderma were capable of bio-transforming T-2 toxin, HT-2 toxin, diacetoxyscirpenol and neosolaniol into their glycosylated forms and one Trichoderma strain could bio transform FA into low toxic fusarinol. These findings proved that Trichoderma isolates could manage toxigenic Fusarium via direct competition and volatile-mediated indirect inhibition. In addition, these antagonists possess defensive systems against mycotoxins for self-protection, which enriches our understanding on the interaction mechanism of Trichoderma spp. on toxigenic fungus.
研究领域:
微生物学
·
食品安全
·
植物病理学
✓ 已验证
DOI
PubMed
高影响因子
FOOD SCIENCE AND BIOTECHNOLOGY
·
2013
·Vol. 22
·期 3
·705-712
·
IF 0.695
Wang Mengfan,Guo Jian,Qi Wei,Su Rongxin,He Zhimin
In this paper, an effective and green strategy was developed to obtain aglycone isoflavones from soybean through the extraction, hydrolysis, and purification steps. Firstly, a novel ethanol-alkaline extraction method was designed and optimized. The high extraction yield (94.34%) of isoflavones was achieved under the optimal extraction conditions of pH 9.0, 70°C, 60 min, ethanol concentration of 65%, and 1:15 of the solid to liquid ratio. Then, the cellulase (GC-220) was used instead of traditional β-glucosidase to hydrolyze the glycoside isoflavones into aglycone isoflavones which gave an excellent conversion of 95%. Finally, the crude aglycone isoflavones have been purified by an environmental-friendly procedure comprised of ethanol precipitation, ethyl acetate extraction, and water rinse. The final amount of aglycone isoflavones obtained was 1.279 mg for every gram of defatted soybean by this strategy, and the final recovery, and purity of aglycone isoflavones could achieve 80.38 and 87.21%, respectively.
研究领域:
食品科学
·
植物化学
✓ 已验证
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 3.7
Ying Li,Yu Zeng,Shuo Zhao,Zhen Wang,Li Chen,Kequan Chen
Pyruvate, a pivotal metabolite in the glycolytic pathway, typically confronts substantial barriers to its natural accumulation within microbial cells. This study successfully facilitated the natural accumulation of pyruvate in Actinobacillus succinogenes 130Z by fine-tuning the oxidation-reduction potential (ORP) in the fermentation milieu. A mechanistic exploration revealed that the accumulation of pyruvate was optimized when ORP conditions favorably modulated pyruvate kinase activity and concurrently suppressed succinate dehydrogenase activity. By integrating the influence of metal ions on enzymatic functions with an innovative aluminum ion-mediated ORP control strategy, we achieved a pyruvate yield of 27.54 g/L over 20 hours, which constitutes an 89.54% increase compared to the baseline. Additionally, the production rate of pyruvate reached 1.38 g/L·h. This investigation not only elucidates the metabolic underpinnings that facilitate the natural enrichment of glycolytic intermediates in Actinobacillus succinogenes 130Z but also lays a robust theoretical foundation for the industrial-scale fermentation of pyruvate. Moreover, the capability to efficiently and rapidly concentrate essential platform metabolites within the glycolytic pathway is of paramount significance, potentially propelling forward the research and synthesis of various downstream metabolic products.
研究领域:
微生物学
·
生物化学
·
工业发酵
✓ 已验证
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2020
·
IF 4.972
Shanshan He,Yanling Wang,Jianhua Xie,Heng Gao,Xiujiang Li,Zhibing Huang
Monascus comprises purple-red molds. Various compounds can be obtained from these species, including statins and food-safe yellow, red, and orange pigments. However, the secondary metabolite citrinin, a mycotoxin, is produced during the late stages of growth. Citrinin biosynthesis should be reduced to apply Monascus pigments safely. Fortunately, this can be achieved by the addition of flavonoids (genistein, daidzein, apigenin, and kaempferol). However, the effects of these flavonoids on other metabolites remain unknown. Here, we report a 1 H NMR-based multivariate metabolomic analysis of the effects of flavonoids on mycotoxin citrinin production by Monascus . Fifteen metabolites involved in lysine and arginine biosynthesis and alanine, aspartate, glutamate, biotin, arginine, proline, and glutathione metabolism were detected. The reduction in glutamate, aspartate, biotin, and 2-phosphoglycerate content suggested their association with the citrinin reduction mechanism. This study identifies the citrinin production pathway in Monascus and will aid in the development of citrinin-control methods.
研究领域:
微生物学
·
代谢组学
·
食品科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 8
·1313-1318
·
IF 3.1
Ying Yang,Jianjuan Zhao,Xinyuan Zhang,Zhanggui Hu,Yicheng Wu
A new 3-(4-methoxy)phenyl-5-isoxazolone-based crystal MPMOI (C18H15NO4) was designed and synthesized by the substitution of –OCH3 groups on two sides of the molecular framework. Striped yellow MPMOI crystals were successfully grown by slow evaporation from chloroform solution. Due to the introduction of the –OCH3 group, MPMOI crystallizes in the noncentrosymmetric space group of P212121 and exhibits a second harmonic generation (SHG) response about 3.7 times larger than that of KDP under a 1064 nm fundamental laser. Thermal analysis, UV-visible absorption, infrared spectroscopy, and Raman spectroscopy were also performed to characterize the physical and chemical properties of MPMOI. This work not only presents a new NLO crystal, but also provides a feasible design strategy for group substitution.
研究领域:
材料科学
·
晶体学
·
光学
·
分子设计
✓ 已验证
DOI
高影响因子
Applied Catalysis O: Open
·
2024
·
IF 0
Kaiyang Xu,Lingfeng Weng,Lizhi Wu,Li Tan,Yu Tang
Cyclohexanone is a key raw material for manufacturing nylon and other chemicals. The sustainable conversion of biomass-derived phenol to cyclohexanone meets the requirements of sustainable development goal but still be challenging. Herein, a catalyst containing isolated Pd cations in zeolite, namely Pd 1 /ZSM-5, is investigated for the partial hydrogenation of phenol to cyclohexanone. Under 140 °C and 1.5 MPa of initial hydrogen pressure, the conversion of phenol reaches 95.6% with the selectivity to cyclohexanone of 99.9%. Besides, the turnover rate (TOR) of partial hydrogenation of phenol reaches 382.7 h −1 . The mild adsorption affinity of cyclohexanone on catalytic sites leads to the high selectivity. Moreover, as unveiled by surface reactivity of phenol monitored by in-situ infrared spectrum, the oxygen atom of phenol hydroxyl group is adsorbed on the Brönsted acid site of Pd 1 /ZSM-5 as the key reaction step. The reaction intermediate involves the partial hydrogenation of benzene ring of phenol.
研究领域:
催化化学
·
绿色化学
·
可持续发展
·
生物质转化
✓ 已验证
DOI
FORENSIC SCIENCE INTERNATIONAL
·
2014
·
IF 2.115
Binling Zhu,Liang Meng,Kefang Zheng
Recently a new type of mixed drug oral solution has become prevalent in China, the identification and quantitative inspection of which are demanded in conviction and sentencing as well as drug intelligence. In 2013, inspection was carried out on 86 bottles of substances seized in 13 cases with the adoption of GC–MS methodology for qualitative identification and GC–FID for quantitative identification. 94.1% of the samples were light yellow turbid liquid while 95.3% were detected with more than two drugs. Detection rate of methamphetamine, MDMA and ketamine was up to 89.5%, 37.2% and 83.7% respectively. Quantitative inspection results indicated that concentrations of methamphetamine, MDMA , ketamine were 0.04–13 mg/mL, 0.04–29 mg/mL and 0.1–34 mg/mL, respectively. Appearance, composition and drug concentration of samples vary from case to case.
研究领域:
毒理学
·
分析化学
·
法医学
✓ 已验证
DOI
高影响因子
BIOMASS & BIOENERGY
·
2021
·
IF 5.061
Chenlong Liu,Plaifa Hongmanorom,Jangam Ashok,Dong Chen,Qiao Wu,Wenju Wang,Zhigang Wang
Conversion of biomass tar to useful hydrogen-rich syngas will solve environmental issues related to tar emission as well as increase the overall efficiency of biomass conversion . There are various catalysts to achieve that. In this study, La 1-x Ce x Ni 0.8 Fe 0 . 2 O 3 (0 ≤ x ≤ 1) is selected, and acetic acid has been used as a biomass tar model. Fixed-bed reactor was used for this investigation, while the catalyst characterization has been done mainly by X-ray Adsorption spectroscopy (XAS), X-ray diffraction (XRD), CO 2 -temperature programmed desorption (TPD). The results showed that La 0 . 8 Ce 0 . 2 Ni 0 . 8 Fe 0 . 2 O 3 has the highest acetic acid conversion (68.7%) and hydrogen yield (63.6%). Which is attributed to its more catalytic defect, stable structure and stronger basicity . Furthermore, to express more comprehensively on tar models, La 0 . 8 Ce 0 . 2 Ni 0 . 8 Fe 0 . 2 O 3 were investigated with blends of acetic acid and acetone with different mole ratios (1:0, 4:1, 3:2, 2:3, 1:4 and 0:1) in temperature ranges (500 °C–900 °C), and weight hourly space velocity (WHSV = 12.02 h −1 -15.63 h −1 ). The highest carbon conversion (85.7%) and hydrogen yield (88.5%) were obtained at 600 °C, mole ratio = 4:1, and WHSV = 14.43 h −1 . It is noted that the result of the blend was better; however, based on in situ diffuse reflectance infrared fourier transform spectroscopy ( in-situ DRIFTS) investigation, the enhancement ascribed to inhibition of ketonization reaction was occurred with pure acetic acid. In addition, high reaction temperature and weight hourly space velocity decrease the catalytic activity by accelerating sub-reaction and graphitization coke deposition. In a word, La 0 . 8 Ce 0 . 2 Ni 0 . 8 Fe 0 . 2 O 3 catalyst shows good performance with hydrogen yield over 70% during 1440 min at optimum conditions.
研究领域:
能源科学
·
催化化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 15
·155503
·
IF 3.874
Wangyang Yang,Honglie Shen,Jiawei Ge,Binbin Xu
Various gas sensors have made considerable improvements to the quality of people's lives. However, in most cases, changing of materials is necessary to adapt to the changing of the target gas, which limits the further application of gas sensors. To meet this challenge, in this work, molecular imprinting (MI) technology is introduced. Acrylic acid is used as a functional monomer, while gas molecules, including acetone, are used as templates. The MI process with an acetone template helps improve the acetone selectivity of TiO2 by up to 1.74–2.80 times. Moreover, it proved that other templates can increase the corresponding selectivity by at least 1.5 times by using the same matrix material. These results demonstrate the potential importance of the MI process in constructing a highly compatible gas sensor industry. Beyond this, the MI process has proved to achieve an ultrahigh specific surface area of 384.36 m2 · g−1. The optimal acetone sensor exhibits desirable comprehensive performance compared with other reports. An excellent TiO2 based prototype acetone sensor working at 300 °C with a low detection limit of 18 ppb is obtained.
研究领域:
材料科学
·
化学工程
·
传感技术
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Hongyan Zhang,Yingze Li,Naiyu Jiang,Nan Zhou,Xiaohu Zou,Dongxing Zhang
The primary challenges in utilizing thermoplastic poly(ether-ether-ketone) (PEEK) stem from its inherent lack of toughness in production settings. Traditional methods of enhancing toughness often compromise other essential properties of the material. This research focuses on optimizing the toughness of PEEK resin composites by integrating graphene oxide (GO) and silicone rubber (SR) particles into the PEEK matrix to formulate multiphase composites. A detailed investigation was carried out to assess the impact of these two distinct particles on the PEEK resin properties. In the evaluation of toughness across various composite materials, a notable enhancement was evident in the GO/PEEK, SR/PEEK, and GO/SR/PEEK ternary composites compared to the pristine PEEK. Furthermore, these composites maintained comparable stiffness and thermal resistance to standard PEEK. Tensile strength, fracture absorbed energy, and fracture toughness in GO/SR/PEEK ternary composites versus pure PEEK indicated increases of 18.38%, 174.53%, and 46.37%, respectively. Fracture analysis demonstrated that multi-particle modification methods significantly complicated toughening mechanisms, including rubber voiding, matrix shear band formation, crack deflection, and matrix plastic deformation. The findings from this study propose a viable material design principle for engineering materials that effectively balance strength and toughness. Highlights The GO/SR/PEEK composites with a balance between strength and toughness. GO and SR exert a synergistic effect on the mechanical properties balance of PEEK. The plastic deformation is promoted as the main toughening mechanism. GO and SR enhanced PEEK crystallization, improving its mechanical properties.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）