LUMINESCENCE
·
2021
·Vol. 36
·期 6
·1469-1475
·
IF 2.464
Xiping Mei,Dongxiu Wang,Lin Zhang,Junfen Li,Chuan Dong
Fifty-four Eucommia ulmoides leaves were subjected to a hydrothermal technique to synthesize carbon dots (CDs) of 3.55 ± 1.45 nm size. The nanomaterial possessed excellent stability and strong fluorescence emission (φ f 42.3%). In a neutral buffer solution, the fluorescence signals of CDs solution were enhanced by aluminium ion without interference from other ions. Degree of enhancement correlated linearly with the Al 3+ content in the range 0.01–2.5 mM. Response of this method was fast and sensitive (detection limit was 23 nM). The CDs performed successfully as a sensitive sensor for trace Al 3+ determination in water samples, and satisfactory results were obtained.
研究领域:
纳米材料科学
·
环境监测
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2011
·
IF 3.463
Yuanfeng Wang,Fangfang Mao,Xinlin Wei
The chemical characterization and antioxidant activities of tea leaves polysaccharides (TLPS), tea seed polysaccharide (TSPS), tea flower polysaccharide (TFPS) were investigated after isolated from the leaves, flowers and seeds of camellia sinensis. Results indicated that TLPS, TFPS and TSPS were all composed of Rha, Ara, Gal, Glu, Xyl, GalA and GluA, besides, TLPS was also contained Man and Rib, and TFPS was also contained Man. The molecular weight distribution of TLPS, TFPS and TSPS ranged from 3.67 × 10 3 to 7.58 × 10 5 Da, 2.56 × 10 3 to 1.46 × 10 6 Da and 3.66 × 10 3 to 9.61 × 10 5 Da, respectively. Antioxidant activity tests revealed that TLPS, TFPS and TSPS exhibited strong antioxidation in a concentration-dependent manner. Furthermore, TLPS and TFPS had higher antioxidant activity than TSPS. The nature of monosaccharide and the higher molecular weight in TLPS and TFPS molecules probably contribute to the activities.
研究领域:
食品科学
·
药理学
·
植物学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Lian Yu,Liu Cao,Yuan-Hang Chang,Cong-Jia Duan,Chang Liu,Xue-Lian Zhao,Gan-Lu Yue,Xi-Qing Wang,Yu-Jie Fu
In this work, an efficient and environmentally friendly extraction process was proposed to simultaneously obtain iridoids and phenolic acids from Eucommia ulmoides Oliver leaves (EUL). Namely, the integrated microwave-assisted ternary deep eutectic solvent extraction (TDES-MAE), which was firstly applied to extract compounds from EUL for the first time. In the tailor-made TDES system, tiny ascorbic acid (Vc) was added to modify the acidity of the binary deep eutectic solvents (BDES)composed of a 1:2 M ratio of Choline chloride/1,4-butanediol)to form TDES, which possess a higher extraction yield than BDES. Some factors including DES types, molar ratio, water content and selection of hydrogen bond donor (HBD) were investigated to get the superior TDES solvent. Then Box-Behnken design was implemented to acquire the optimum conditions, such as extraction time, extraction temperature, liquid-solid ratio were optimized by using response surface methodology (RSM). Under the optimal conditions, extraction efficiency of the TDES-MAE was significantly increased and 1.4-fold to the traditional method. Meanwhile, the excellent recovery and the antioxidant activity shown that the extraction system based on tailor-made TDES was economically productive and efficient for extracting more beneficial products from plants.
研究领域:
植物化学
·
天然产物开发
·
药用植物研究
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 6
·e202405266
·
IF 2
Boao Du,Lihui Zheng
Graphical This research focuses on supercapacitor electrode materials. Using Rhus typhina leaves as raw materials, it innovatively employs a mixed activator of K 2 CO 3 and ZnCl 2 Through a two-step carbonization-activation method, O/N self-doped TLMPC-x is prepared. Among them, TLMPC-1.0 exhibits outstanding performance, with a large specific surface area, high specific capacitance, and strong cycle stability, demonstrating promising application prospects. This research focuses on the field of supercapacitor electrode materials. Using Rhus typhina leaves as the starting material, it innovatively applies a mixed activator composed of K 2 CO 3 and ZnCl 2 and successfully prepares O/N self-doped leaf-derived porous carbon electrode materials (TLMPC-x) through a precisely controlled two-step carbonization-activation method. The aim is to develop a new type of electrode material that combines excellent performance, environmental friendliness, and the advantage of low cost, and to deeply explore the mechanism of the effect of the activator ratio on the specific surface area and electrochemical performance of the materials. Among them, TLMPC-1.0 remarkably exhibits a specific surface area as high as 2827.9 m 2 g −1 . Its abundant and multi-level pore structure complements well with the diverse heteroatom doping. During the electrochemical performance test in the KOH electrolyte system, the specific capacitance of this material excellently reaches 335.3 F g −1 , and the capacitance retention rate is stably maintained at 69%. When the power density is 250 W kg −1 , an energy density of 9.45 Wh kg −1 can be achieved. Moreover, after 20 000 charge–discharge cycles, its capacitance retention rate is still as high as 96.4%, demonstrating extremely excellent electrochemical performance and ultra-stable cycle stability.
研究领域:
材料科学
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能源存储
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Natural Products and Bioprospecting
·
2025
·Vol. 15
·期 1
·1-8
·
IF 4.9
Wang Zi-Jiao,Tan Bang-Yin,Zhao Yun,Wang Chang-Bin,Zhao Yun-Li,Luo Xiao-Dong
Two new together with 32 known compounds were isolated from the leaves of Lycium barbarum . Their structures were elucidated using 1D and 2D NMR, HRESIMS, and ECD spectroscopic techniques. Compounds 1–34 were evaluated for their anti-rheumatoid arthritis activities in a lipopolysaccharide (LPS)-induced MH7A cells inflammatory model. As a result, compounds 1– 3 , 6 , 8 , 10 , 14 , 17–19 , 29 and 31 inhibited the activity of lactate dehydrogenase (LDH) and nitric oxide (NO) at concentrations 20 μM. Among them, compound 1 showed the best effectiveness, with inhibition rates of 46.7% for NO and 32.8% for LDH. Graphical
研究领域:
药理学
·
植物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water Research X
·
2024
·
IF 7.2
Min Zhang,Zhening Fang,Jun Wang,Rui Ding,Haiping Fang,Ruoyang Chen
Water disinfection by copper vessels has been prevalent over thousands of years. Unfortunately, people are still suffering from the bacterial pollution in drinking water. Here we show that, only through steeping with tiny amounts of common plant leaves, the room-temperature water in copper pots has unexpectedly high antibacterial ability. Remarkably, copper ions released from copper pots into water are in concentrations lower than the WHO safety threshold for drinking water, and have effective antibacterial ability when water contains specific leave components (polyphenols and/or lignin). Our computations show that the key to enhance antibacterial ability is the great increase in the proportion of Cu + induced by aromatic rings in these leave components, which has been demonstrated by our experiments. The findings may disclose the mystery of copper vessels for water disinfection, and more importantly, provide effective antibacterial applications in industries and daily lives, by safely using copper ions together with biocompatible natural substances.
研究领域:
环境科学
·
微生物学
·
材料科学
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生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYTOCHEMISTRY
·
2024
·
IF 3.2
Meihong Liu,Haibo Tan,Haihui Xie
ABSTRACT Chemical investigation on the leaves of Michelia champaca L. (Magnoliaceae) led to the isolation of five previously undescribed phenylethanoid glycosides (PhGs), 4- O - β - d -glucopyranosyl-acteoside ( 1 ), 4"'- O -(6- O - E -caffeoyl)- β - d -glucopyranosyl-acteoside ( 2 ), 4"'- O -(6- O - E -caffeoyl)- β - d -glucopyranosyl-isoacteoside ( 3 ), 6""- O - E -feruloyl-echinacoside ( 4 ), and 6""- O - p - E -coumaroyl-echinacoside ( 5 ), together with eighteen known PhGs. Their structures were determined by spectroscopic and chemical methods. All the known PhGs except acteoside ( 8 ) were not previously reported in the genus. Twenty-one PhGs exhibited more potent DPPH radical scavenging activity and FRAP than l -ascorbic acid ( l -AA), and twenty-two PhGs showed better ABTS radical cation scavenging activity than l -AA. In addition, twelve PhGs displayed more potent cellular reactive oxygen species (ROS) scavenging activity than curcumin. The results revealed that the leaves of M. champaca are a rich source of phenylethanoid glycosides and antioxidants.
研究领域:
药用植物学
·
天然产物化学
·
植物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENZYME INHIBITION AND MEDICINAL CHEMISTRY
·
2025
·
IF 5.4
Wei Dai,Liping Dai,Tao Su,Qin Lin,Zhiwen Lin,Shuxin Ye,Peihao Xu,Hongfeng Chen,Xilong Zheng
A green ultrasound-assisted deep eutectic solvent (UAE–DES) method was optimised for extracting flavonoid enzyme inhibitors from Blumea aromatica. Optimal conditions (choline chloride-1,4-butanediol 1:3 molar ratio, 43% water content, 50 mL/g liquid-to-solid ratio, 80 °C ultrasound for 48 min) yielded 3.15% total flavonoids, 45.2% higher than 50% ethanol extraction. Scanning electron microscopy confirmed cell wall disruption. The UAE–DES extract showed the strongest enzyme inhibition among all extracts tested (IC50 35.872 ± 0.294 µg/mL for α-glucosidase, 9.126 ± 0.285 μg/mL for tyrosinase), though the α-glucosidase inhibition was much weaker than acarbose, while tyrosinase inhibition was comparable to kojic acid. Six flavonoids were identified via UPLC-Q-Orbitrap HRMS, including scutellarein and corylin. Molecular docking revealed strong binding affinities (≤ −5 kcal/mol), with corylin showing the highest binding to both enzymes through hydrogen bonds and van der Waals interactions. This approach supports sustainable discovery of natural enzyme inhibitors for antidiabetic and skin-whitening applications.
研究领域:
植物化学
·
酶学
·
绿色化学
·
药学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2023
·
IF 17.6
Xiao Meng,Zaiqi Li,Yuanyuan Liu,Zeyan Wang,Peng Wang,Zhaoke Zheng,Ying Dai,Baibiao Huang,Hefeng Cheng,Jr-Hau He
Hydrogen production from solar water splitting, especially via photovoltaic-electrocatalysis, has been regarded as a promising approach for the conversion of abundant but intermittent solar energy into storable chemical fuels. Despite much progress, conventional combined photoelectrochemical devices usually suffer from severe instability issues, which largely inhibit them for practical applications and may also lead to the uncertain efficiency value for true overall water splitting. Here, we report an unassisted solar water splitting device with concurrent high efficiency and stability, which is constructed by spatial coupling of tandem III-V-based GaInP/GaAs/Ge light absorber and robust earth-abundant Ni foil-based MoNi 4 /MoO 2 bifunctional electrocatalysts . Remarkably, apart from the outstanding hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance, bifunctional MoNi 4 /MoO 2 electrocatalysts also largely avoid electrode contamination issues, while the robust Ni substrate protects III-Vs from conventional corrosion problems . Consequently, this integrated photovoltaic-electrolysis system device exhibits a high solar-to-hydrogen (STH) conversion efficiency of 17.6 % in alkaline electrolytes with long-term stability of up to 845 h. Further construction into a wireless unassisted monolithic device could lead to an artificial leaf with an STH efficiency of 4.28 %, holding great promise in future solar fuel production with concurrent high efficiency, good stability as well as low cost.
研究领域:
可再生能源
·
电化学
·
材料科学
·
太阳能燃料
✓ 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）