NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 35
·15512-15523
·
IF 2.7
Sen Fu,Hanxu Guo,Hong Yuan
A nano-ZSM-5 zeolite having a hierarchical pore structure was synthesized using L-lysine as a mesopore template and growth inhibitor. The effects of the L-lysine/Si and Si/Al molar ratios on the morphology and pore structure of the zeolite were studied. The products were characterized by scanning electron microscopy, transmission electron microscopy and N2-Brunauer–Emmett–Teller surface area analysis. These assessments showed that the particle size of the ZSM-5 zeolite could be reduced to 60 nm with a surface area as high as 395 m2 g−1 and a high density of mesopores. These zeolites were applied to the catalytic pyrolysis of oleic acid in a fixed-bed reactor to generate benzene, toluene and xylenes (BTX). At a reaction temperature of 500 °C, the catalyst having L-lysine/Si and Si/Al ratios of 0.4 and 30, respectively, gave a BTX yield of 27.4 wt%. This yield decreased with increases in the Si/Al ratio whereas varying the L-lysine/Si ratio did not produce a specific trend. The spent catalyst was characterized by thermogravimetric analysis and exhibited superior anti-coking ability and longer catalytic lifetime compared with a standard ZSM-5 zeolite.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yi Zheng,Jinyue Song,Junzhou Men,Hui Xian,Yating Wang,Tao Jiang
Metal organic frameworks (MOFs) are regarded as the promising potential photocatalytic materials because of its high specific surface area , regular morphology and highly adjustable structure. Herein, introducing different addition percentage of 1-vinylimidazole to two-dimensional zeolite imidazole framework (ZIF-L) with leaf-shaped morphology was successfully prepared via water-assisted strategy and applied in the photocatalytic hydrogen evolution experiments. The results indicate that VZ-12 shows the highest photocatalytic activity with hydrogen production rate of 162.7 μmol g −1 h −1 , which is 3 times than that in VZ-0 (pure ZIF-L, 56.33 μmol g −1 h −1 ) under simulated sunlight. The enhanced performance is ascribed to the increased specific surface area observed via BET, narrow band gap ( E g ) explored through UV–vis DRS and decreased recombination of photo-generated charge carriers measured by photoluminescence (PL). In a word, the effort of our study provides a new idea for developing and fabricating efficient hydrogen production photocatalyst via water splitting.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuhan Fan,Yongze Cao,Zhihua Zhang,Hualong Tao,Meiling Li,Xizhen Zhang,Sai Xu,Baojiu Chen
By using the molten salt synthesis with B 2 O 3 flux and adjusting the doping concentration of Y 3+ , the intergrowth of the YTa 7 O 19 phase in L-Ta 2 O 5 is achieved. This structure enhances the pure green upconversion luminescence (UCL) intensity, which is because the YTa 7 O 19 phase isolates the distribution of Er 3+ /Yb 3+ in the 2D layer, localizing the energy transfer from Yb 3+ to Er 3+ and reducing the loss during the energy transfer process. By adjusting the concentration of Er 3+ /Yb 3+ and the holding temperature, the green UCL integral intensity of the optimal sample is 1.09 times that of β-NaYF 4 :Er 3+ /Yb 3+ . The intergrowth of the YTa 7 O 19 phase in L-Ta 2 O 5 is demonstrated by high-resolution transmission electron microscopy (HRTEM) and comparing bandgap values, and the structure and properties cannot be obtained by solid phase sintering. Using the luminescence intensity ratio (LIR) technology, the absolute temperature sensitivity (S A ) and relative temperature sensitivity (S R ) were 0.01359 K −1 and 0.01001 K −1 , respectively. The phosphor-converted 980 nm LEDs based on samples are fabricated, the CIE color coordinate can reach (0.20, 0.76), which exceeds NTSC standard. This indicates that this material can be used for temperature sensing and luminescence display applications.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Guoliang Zhang,Cong Xue,Ruxangul Jamal,Tursun Abdiryim,Feng Xu,Qian Cheng
L-Tyrosine (L-Tyr) is one of the 21 essential amino acids for the human body. Its accurate detection is of great clinical and practical significance in monitoring, food quality and safety. Functional groups critically govern electrochemical sensor performance by mediating target adsorption. Conventional poly (3,4-ethylenedioxythiophene) (PEDOT)-based sensors face limited flexibility and active site accessibility. Amino-grafted PEDOT was developed by in situ growth on Ti 3 C 2 T X nanosheets, incorporating small-sized Au nanoparticles to create a highly conductive and active substrate for selective detection of L-Tyr. The resulting molecularly imprinted electrochemical sensor, fabricated on the PEDOT-CH 2 NH 2 /Ti 3 C 2 T X /Au NPs/GCE platform, exhibited enhanced catalytic activity and efficient L-Tyr enrichment. The combination of components improved electron transfer, MIP stability, and imprinting cavity accessibility. The sensor demonstrated a broad linear range (10 −6 –100 μM) with an ultralow detection limit (3.64 × 10 −6 μM), and exhibited excellent selectivity, reproducibility, and operational stability. Practical tests in milk matrices confirmed high recovery rates (96.65 %–101.35 %), showcasing its potential for use in complex food systems and it also has detection capabilities similar to those of standard methods. This work provides a sensitive and reliable strategy for amino acid monitoring in food, with significant applications in food safety assurance.
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POLYMER BULLETIN
·
2025
·
IF 4
Liu Yushen,Fan Xiaotong,Zhang Xiaoran,He Chao,Xiang Zhouyang,Hu Zhenhua
Polyvinyl alcohol (PVA)-based films are widely used due to their mechanical properties and biodegradability. However, their limitations in water resistance and oxygen barrier properties hindered their further application in packaging industry. In this work, carboxymethyl glucuronoxylan/polyvinyl alcohol/ε-poly-(L-lysine) carbon dots/ZnCl 2 composite films with high mechanical properties and antibacterial properties were developed. First, carboxymethyl glucuronoxylan (CMX) and ε-poly-(L-lysine) carbon dots (PL-CD) were synthesized. The structural groups of CMX and PL-CD were confirmed by the FTIR. Then, CMX/PVA/ZnCl 2 /PL-CD composite films were prepared by casting method. With the addition of PVA, ZnCl 2 and PL-CD, the composite films demonstrated a notable improvement in mechanical properties, contact angle (tensile strength: 8.65 MPa ~ 22.4 MPa, elongation at break: 1.1% ~ 4.2%, Young’s modulus: 549.1 MPa ~ 1114.7 MPa, contact angel: 74.7° ~ 105.3°, OTR: 2.04 cm 3 /(m 2 ·day) ~ 3.67 cm 3 /(m 2 ·day)). In addition, all the composite films showed excellent antibacterial properties with the addition of PL-CD. Hence, the carboxymethyl glucuronoxylan/polyvinyl alcohol/ε-poly-(L-lysine) carbon dots/ZnCl 2 composite films holds significant promise for diverse applications in the packaging industry.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Zhe Wang,Jiamin Wang,Yu He,Ming Yu,Junping Wang
We present the first electrochemiluminescence (ECL) biosensor integrating N-Acetyl-L-cysteine (NALC)-functionalized upconversion nanoparticles (UCNPs) with reduced graphene oxide (COOH-rGO) for the covalently immobilization of tyrosinase (TYR), and ultrasensitive detection of catechol, a highly toxic and recalcitrant aquatic pollutant. The NALC layer establishes a dense array of enzyme-anchoring sites on the COOH-rGO electrode while preserving TYR activity and extending its operational lifetime. The ECL signal originates from TYR-mediated redox cycling between catechol and o-quinone, generating electrons that amplify UCNPs luminescence. Under optimized conditions, the limit of detection of this biosensor for catechol was 2.7 × 10 −9 M (S/N = 3), detection range of 0.1 × 10 −6 –100 × 10 −6 M. The platform demonstrates high sensitivity, stability, and selectivity, and has been validated in water samples, offering a robust strategy for enzymatic ECL-based environmental monitoring.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Mingyu Wang,Haofei Sun,Xinyi Bai,Bo Su,Kai Li,Shengbo Zhang,Hailin Cui,Cunlin Zhang,Zhaoxin Geng
Hypertension directly or indirectly accounts for over 10% of maternal deaths. L-methyldopa is a safe antihypertensive for pregnant women, yet its low aqueous solubility substantially reduces bioavailability. This study enhances L-methyldopa's solubility in simulated gastric and intestinal fluids through cocrystallization with D-mannitol, thereby improving bioavailability. The cocrystal was synthesized via slow solvent evaporation. Then, multiple characterization techniques including powder X-ray diffraction (PXRD), Raman spectroscopy (Raman), scanning electron microscopy (SEM), and differential scanning calorimetry-thermogravimetric analysis (DSC-TGA) were employed to confirm the formation of cocrystals and verify the crystal structure and purity. Subsequently, a terahertz time-domain spectroscopy (THz-TDS) system was used to measure the spectral properties of D-mannitol, L-methyldopa, physical mixture, and cocrystal, and it was found that terahertz absorption spectroscopy can effectively characterize the formation of cocrystals. Furthermore, we also performed DFT calculations to simulate the crystal structures of D-mannitol, L-methyldopa, and the corresponding cocrystal. By comparing the experimental and simulated terahertz absorption spectra, it was found that they showed good agreement. High-performance liquid chromatography (HPLC) measurements showed that, compared with pure L-methyldopa, the solubility of L-methyldopa in the cocrystal in simulated intestinal fluid and gastric fluid increased by 53% and 67% respectively. DSC-TGA analysis confirmed significantly enhanced thermal stability of the cocrystal. This work provides valuable methodological insights for pharmaceutical cocrystal development.
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Plants-Basel
·
2025
·Vol. 14
·期 18
·2918
·
IF 4.1
Guannan Kong,Da Song,Chao Zhang,Xinyao Jia,Yingying Ren,Shuhe Wei,Huiping Dai
Cadmium contamination in soil threatens ecological safety and human health. Phytoremediation has gained attention due to its cost-effectiveness and environmental sustainability. Studies show that plant growth-promoting rhizobacteria can enhance the ability of hyperaccumulator plants to remove heavy metals. This research aimed to isolate and identify plant-growth-promoting rhizobacteria under Cd stress and assess their impact on the growth and Cd accumulation ofSolanum nigrumL. Six bacterial strains were isolated from the rhizosphere ofS. nigrum, all showing high Cd tolerance. Among them, LKT25 exhibited multiple growth-promoting traits, including indole-3-acetic acid production, nitrogen fixation, 1-aminocyclopropane-1-carboxylate deaminase, and siderophore synthesis. Under varying Cd concentrations (5, 25, and 50 mg/kg), theBacillus thuringiensisstrain LKT25 significantly improved Cd removal byS. nigrum. At 5 mg/kg Cd, the removal efficiency reached 45.13%. LKT25 also enhanced plant growth, photosynthesis, and antioxidant activity, contributing to improved Cd remediation. This study provides new microbial resources and technical support for using rhizobacteria in remediating heavy metal-contaminated soils.
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PubMed
高影响因子
Separations
·
2025
·Vol. 12
·期 9
·249
·
IF 2.7
Ru Zhao,Xiaoli Li,Yazhou Bao,Wenjun Xu,Chen Xu,Rongrong Wang,Tianlan Xia,Tingli Liu,Ailing Ben
In this investigation, pinocembrin and galangin were efficiently extracted from the male inflorescence ofPopulus albaL. ×berolinensisK. Koch through an enzymatic pretreatment–ultrasonic-assisted strategy (EP-UAS), and the feasibility of their pilot-scale application was validated. The optimal parameters (ethanol volume fraction, cellulase dosage, incubation temperature, incubation time, pH, liquid‒solid ratio, ultrasonic irradiation power during incubation, duty cycle, ultrasonic irradiation power and time during extraction) affecting pinocembrin and galangin yields were systematically explored. The Box–Behnken design (BBD) results provided optimal parameters for the EP-UAS process. Under the optimal conditions, the actual yields of pinocembrin and galangin were 2158.33 ± 0.13 μg/g and 1257.96 ± 0.06 μg/g, respectively. Stability, recovery and reproducibility were determined under the above optimized conditions to evaluate the proposed EP-UAS method. Moreover, laboratory-scale experimental results revealed that the conditions selected via single-factor and response surface experiments were also applicable to pilot-scale production, facilitating industrialization.
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TALANTA
·
2025
·
IF 6.1
Xiujuan Wang,Binghui Shi,Cengceng Xia,Mengnan Hou,Jingying Wang,Anning Tian,Chao Shi,Cuiping Ma
Traditional detection of foodborne pathogen relies on advanced analyzers, which is inadequate for the rapid control of infections, particularly in resource-limited regions, highlighting the necessity of developing detection systems for point-of-care testing (POCT). Herein, taking Vibrio parahaemolyticus as a detecting target, we reported poly- L -lysine functionalized silica membrane (PL-SM) based loop-mediated isothermal amplification (pLAMP) platform for sensitive on-site detection. This platform utilized PL-SM for DNA capture driven by the electrostatic attraction between protonated amine groups of poly-L-lysine and negatively charged phosphate groups of DNA, followed by introducing a colorimetric indicator calcein for LAMP amplification. After optimization, the colorimetric mode of pLAMP allowed the screening of V . parahaemolyticus with the visual limit of detection ( v LOD) of 1 CFU/mL in 50 min, 1000-fold lower than methods based on commercial kits. Validation was performed using 174 seafoods, which was 97 % concordant to those of real-time PCR. Furthermore, an image processing approach was developed based on the analysis of the RGB under UV light. Paired with a smartphone, the objective analytical method could be readily conducted in the field. Thus, we propose a sensitive and visual detection platform, which may play a crucial role in improving testing efficiency and accuracy in food safety, medical diagnostics, and environmental monitoring.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Ce Chen,Lidong Yu,Xueting Li,Zewen Yu,Danjie Song,Siqi Wang,Fangshun Li,Shanshan Jiang,Yajie Chen,Jucai Xu,Jianglin Fan,Bingsheng Li,Li Li
Ultraviolet (UV) exposure causes damage to human skin and mucous membranes, resulting in oxidative stress, and can also lead to inflammation of human skin, skin aging, and even diseases such as squamous cell carcinoma and melanoma of the skin. The main means of protection against UV radiation is physical shielding and the use of sunscreen products. Carbon dots as a novel nanomaterial provide a new option for UV protection. In this article, we introduced sulfhydryl groups to synthesize l-cysteine-derived carbon dots (GLCDs) with UV resistance. GLCDs exhibit high-efficiency and excellent UV absorption, achieving 200–400 nm UV absorption (99% UVC, 97% UVB, and 86% UVA) at a low concentration of 0.5 mg/mL. Meanwhile, GLCDs can reduce apoptosis and UVB-induced oxidative damage, increase collagen type I gene expression, and inhibit skin aging in zebrafish. It also inhibits senescence caused by the senescence inducer 2,2′-azobis(2-methylpropionamidine) dihydrochloride and reduces oxidative damage. The above studies show that GLCDs possess efficient broad-spectrum UV absorption, antiphotoaging, and antiaging capabilities, which will have a broad application prospect in UV protection.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Xueyi Cai,Ziqiang Lin,Lang Liu,Wangwang Yan,Zi Wang,Yang Zhang,Xiao Chen,Dong Liang
Momordica charantia L., commonly known as bitter gourd, is a popular vegetable and medical herb in many countries. The most characteristic phytochemical profile of bitter gourd is its high content of cucurbitane-type triterpenoids, which are responsible for its bitter taste and therapeutic potential. More than 260 cucurbitane-type triterpenoids, including at least 11 5,19-hemiacetals, 40 5,19-methyl acetals, 46 methyl ethers, 6 5,19-ethyl acetals, and 7 ethyl ethers, have been identified from bitter gourd. In this work, by studying the chemical transformation of momordicine I, one of the most abundant cucurbitane-type triterpenoids in bitter gourd, we showed that under acidic conditions, 5,19-hemiacetals of cucurbitane-type triterpenoids could be formed from the intramolecular nucleophilic addition between the C-19 aldehyde and the C-7 hydroxyl group; furthermore, 5,19-acetals and methyl ethers could be generated if methanol was available. Using a UPLC-MS/MS quantification method, we showed that these momordicine I derivatives could not be detected from bitter gourd fruits when extracted with a nonmethanolic solution but could be detected when extracted with methanol after thermal treatment. Moreover, these momordicine I derivatives were detected in two of eight brands of bitter gourd dietary supplements. This might be concerning because these derivatives were not the natural components of bitter gourd, and their safety and efficacy profiles were unknown. Besides, the transformation reactions reported herein should apply widely to other cucurbitane-type triterpenoids as well. Therefore, we believe all 40 5,19-acetals, 46 methyl ethers, 6 5,19-ethyl acetals, and 7 ethyl ethers were the extraction and isolation artifacts and should not be regarded as the natural components of bitter gourd. This work will help to clarify the current misunderstanding of the real cucurbitane-type triterpenoid profile of bitter gourd.
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