FOOD CHEMISTRY
·
2024
·
IF 8.5
Xuechao Xu,Juanli Yang,Guijie Hao,Bo Wang,Tong Ma,Suping Zhu,Lu Gao,Zhen-quan Yang
A multifunctional oxidase-mimicking Ag/Mn 3 O 4 was prepared, catalyzing the 3, 3′, 5, 5′-tetramethylbenzidine (TMB) chromogenic reaction. Six foodborne pathogenic bacteria species, including Escherichia coli , Staphylococcus aureus , Salmonella enterica , Listeria monocytogenes , Bacillus cereus , and Cronobacter sakazakii , were observed to differentially inhibit its oxidase-like activity, resulting in decelerating the TMB chromogenic reaction. Owing to these properties, the following achievements were achieved: colorimetric determination of these bacteria with high sensitivity can be achieved using Ag/Mn 3 O 4 + TMB reaction system; precise identification of these bacteria at different concentrations, including individual bacterium, binary mixtures, and even multivariate mixtures, can be effectively realized by combining the Ag/Mn 3 O 4 -based colorimetric sensor array with principal component analysis (PCA); broad-spectrum inactivation of these bacteria can be remarkably realized through catalyzation of Ag/Mn 3 O 4 to generate superoxide anion free radicals. Therefore, our proposed Ag/Mn 3 O 4 holds significant application potential in the colorimetric determination, precise identification, and broad-spectrum inactivation of foodborne pathogenic bacteria.
研究领域:
食品安全
·
生物传感
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Zhai Jianxin,Xia Zhanghui,Zhou Baowen,Wu Haihong,Xue Teng,Chen Xiao,Jiao Jiapeng,Jia Shuaiqiang,He Mingyuan,Han Buxing
Upcycling of CO 2 into fuels by virtually unlimited solar energy provides an ultimate solution for addressing the substantial challenges of energy crisis and climate change. In this work, we report an efficient nanostructured Ru/MnO x catalyst composed of well-defined Ru/MnO/Mn 3 O 4 for photo-thermal catalytic CO 2 hydrogenation to CH 4 , which is the result of a combination of external heating and irradiation. Remarkably, under relatively mild conditions of 200 °C, a considerable CH 4 production rate of 166.7 mmol g −1 h −1 was achieved with a superior selectivity of 99.5% at CO 2 conversion of 66.8%. The correlative spectroscopic and theoretical investigations suggest that the yield of CH 4 is enhanced by coordinating photon energy with thermal energy to reduce the activation energy of reaction and promote formation of key intermediate COOH* species over the catalyst. This work opens up a new strategy for CO 2 hydrogenation toward CH 4 .
研究领域:
化学
·
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CONTROL
·
2024
·
IF 5.6
Zhen Wu,Yi Wei,Yue Tang,Lian Xia,Xiaojuan Niu,Yuangen Wu
Food poisoning caused by excessive intake of histamine is a significant public health concern. Traditional analytical methods struggle to meet the demands for on-site monitoring of histamine in food. Colorimetry based on nanozyme catalysis can be applied to rapidly detect histamine, but some challenges remain in the specific response of nanozymes to histamine. Herein, a novel “off-on” colorimetric sensor was first established for histamine detection based on Cu 2+ -mediated laccase-mimic activity of flower-like Mn 3 O 4 nanoparticles ( Mnf ). This work proved that Cu 2+ can inhibit the laccase-mimic activity by hindering the electron transfer between Mnf and 2,4-DP molecules. Once histamine was present in the system, Cu 2+ was first consumed due to the coordination with histamine, resulting in the recovery of laccase-mimic activity of Mnf . The color of sensing solution can be converted to the corresponding RGB value by a smartphone for on-site detection of histamine in food. The colorimetric sensor has a limit of detection as low as 0.148 μg mL −1 , which is comparable to that of most colorimetric methods. Moreover, the colorimetric sensor exhibits high selectivity, and has considerable applicability for histamine detection in aquatic products.
研究领域:
食品安全
·
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ning Li,Rui Li,Jianhui Zhao,Lan Liang,Yang Yu,Lingchao Kong,Guanyi Chen,Beibei Yan
Interfacial effect played a critical role in catalytic reactions for environmental remediation. An innovative Mn 3 O 4 @ZnO/TiO 2 heterojunction with multi-interface structure was precisely-designed for the first time through alternate growth of ZnO and TiO 2 nanolayers on Mn 3 O 4 surface by atomic layer deposition. Further, the catalytic property of Mn 3 O 4 @ZnO/TiO 2 was evaluated through denitrification from water under ultrasonic-assisted visible light photocatalysis, which achieved 98.6% NO 3 − -N reduction and 98.8% N 2 selectivity within 120 min. Besides, the Mn 3 O 4 @ZnO/TiO 2 exhibited stability and recyclability during the denitrification process. Mechanism insight revealed significant contributions of the novel multi-interface type II heterojunction. More charge transfer routes and possible reaction interfaces were provided for selective denitrification. Equally important, the synergy between visible light and ultrasound promoted the generation of active radicals. The radical trapping experiment proved the dominate role of e − and CO 2 ∙ - in the denitrification process. Overall, the Mn 3 O 4 @ZnO/TiO 2 appeared to be a promising candidate to remediate aquatic contaminants in ultrasonic-assisted photocatalytic system. Also, this study highlighted an attractive approach for controllable fabrication of multi-interface heterojunctions.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Dingding Liu,Yating Huang,Zhenguo Li,Guohua Jing,Yongdan Li,Huawang Zhao
The advancements in engine technology have led to a decrease in exhaust temperatures, hence enhancing the activity of Cu-SSZ-13 at low temperatures becomes crucial and challenging. This enhancement can be achieved using dual-phase metal oxide/Cu-SSZ-13 composite catalysts. In this work, we evaluated the comparative efficacy of Mn 3 O 4 and Mn 2 O 3 and discovered that Mn 3 O 4 exhibited a significantly superior enhancement in deNO x activity of Cu-SSZ-13 at low temperatures, achieving 95% NO x conversion at 200 °C. This is substantially higher than the conversions recorded by Mn 2 O 3 /Cu-SSZ-13 (78%) and Cu-SSZ-13 (40%). Kinetic and IR results demonstrate that Mn 3 O 4 /Cu-SSZ-13 and Mn 2 O 3 /Cu-SSZ-13 composite samples share a same low-temperature pathway, where bridged nitrates formed on the MnO x react with adsorbed on Brønsted acid sites in Cu-SSZ-13. In this reaction pathway, bridged nitrate formation is identified as the rate-determining step. The distinctive structure of Mn 3 O 4 triggers an increase in oxygen vacancies, creating a higher content of chemically adsorbed oxygen, compared to Mn 2 O 3 . Those adsorbed oxygen facilitates bridged nitrate formation. Consequently, due to the larger amount of bridged nitrate formed on Mn 3 O 4 compared to Mn 2 O 3 , the Mn 3 O 4 /Cu-SSZ-13 sample exhibits higher activity.
研究领域:
环境催化
·
材料化学
·
大气污染控制
·
化学工程
·
表面科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Tao Zhou,Daqing Chen,Haoran Li,Danhua Ge,Xiaojun Chen
The content of gallic acid (GA) is positively correlated with the quality grade of tea. Here, we developed a colorimetric method based on raspberry-like N -doped Mn 3 O 4 nanospheres (N-Mn 3 O 4 NSs) with oxidase-like activity for GA assay. Modulating the electronic structure of Mn 3 O 4 by N doping could promote the catalysis ability, and the produced oxygen vacancies (OVs) can provide high surface energy and abundant active sites. The N-Mn 3 O 4 NSs presented low Michaelis-Menten constant (K m ) of 0.142 mM and maximum initial velocity (V max ) of 9.8 × 10 −6 M s −1 . The sensor exhibited excellent analytical performance towards GA detection, including low LOD (0.028 μM) and promising linear range (5 ∼ 30 μM). It is attributed that OVs and O 2 − participated in TMB oxidation. Based on the reaction color changes, a visualized semi-quantitative GA detection could be realized via a smartphone-based system. It could be applied for evaluating GA quality in market-purchased black tea and green tea.
研究领域:
分析化学
·
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yifan Shao,Sainan Sun,Xinyun Li,Liwen Fan,Xinyi Shen,Yanqing Cong,Shi-Wen Lv
It is very meaningful to develop simple and effective methods for detecting hazardous substances. Herein, a newly-designed Mn 3 O 4 -based composite with oxygen vacancy is synthesized and employed as oxidase-like mimic for conducting chromogenic analysis. After loading Mn 3 O 4 in hollow carbon sphere (HCS), the hydrophobicity of Mn 3 O 4 is remarkably enhanced, thereby creating a microscopic three-phase interface to boost the capturing ability towards O 2 . Interestingly, hollow structure of HCS can provide the spatial confinement effect for Mn 3 O 4 , shortening mass transfer process and improving catalytic activity. Thus, HCS/Mn 3 O 4 composite possesses low interfacial resistance and rapid charge transfer rate. More importantly, HCS/Mn 3 O 4 composite can simulate the activity of oxidase-like mimics, which can oxidize colorless 3,3′,5,5′-tetramethyl benzidine (TMB) to blue oxidized TMB (oxTMB) in a short time. Further analysis indicates that O 2 •− plays an important role, and the direct oxidation of TMB over HCS/Mn 3 O 4 composite also plays a part in the color reaction of TMB. Based on the cascade reactions among TMB, HCS/Mn 3 O 4 and target compound (namely hydroquinone and Cr 6+ ), a simple chromogenic sensing method with broad linear range and low LOD for detecting hydroquinone and Cr 6+ is proposed. In short, current study can give a valuable reference for the design of enzyme mimics and the research on chromogenic mechanism.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Jianwei Liu,Jianan Wang,Lei Zhu,Xin Chen,Qianyue Ma,Zhicheng Xu,Shiyi Sun,Ning Wang,Qinqin Chai,Wei Yan
Lithium-sulfur (Li-S) batteries are considered to be promising candidates for next-generation storage systems. However, the practical applications are still hindered by the severe capacity decay, mainly caused by the large volume change, polysulfide shuttle and sluggish sulfur conversion kinetics. Herein, hollow urchin-like Mn 3 O 4 (HU-Mn 3 O 4 ) microspheres as sulfur hosts have been synthesized by the hydrothermal method and calcination treatment, aiming to prevent the polysulfide dissolution (benefiting from the strong polysulfide anchoring effect of Mn 3 O 4 ) and alleviate the volume expansion of sulfur (benefiting from the special hollow structure). Meanwhile, the urchin-like thorny surface also facilitates the rapid ion/electron transfer and the abundant active sites for the fast sulfur redox kinetics. When used as the sulfur host in Li-S batteries, the S@HU-Mn 3 O 4 cathode delivers a high initial capacity of 1137.4 mAh g −1 with a slow capacity decay of 0.042% after 200 cycles at 0.2 C. Even under the conditions of lean electrolyte (E/S = 7 mL g −1 ) and low N/P ratio (N/P = 2.1), the S@HU-Mn 3 O 4 cathode still enables a stable cycling performance with a high gravimetric energy density (202 Wh kg cell −1 ), demonstrating its great potential in the development of future practical Li-S battery materials.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sensors and Actuators Reports
·
2025
·
IF 7.6
Junting Liang,Dihan Duan,Lubing Sun,Jinming Li,Mengke Wang,Ziyi Chang,Rick F. Thorne,Chuanliang Chen,Demin Duan
Cysteine (Cys) is essential for numerous physiological processes and play a vital role in disease diagnostics, underscoring the necessity for effective and sensitive detection techniques for Cys. In this research, we introduce an ultrasensitive colorimetric approach based on oxidase-like Mn 3 O 4 nanozymes. The nanozymes were synthesized through a straightforward wet chemical method and displayed a flower-like globular morphology, showing remarkable oxidase-like catalytic performance with a low K m value of 0.1896 mM and a high V max of 2.8 × 10⁻⁷ M s⁻¹. By leveraging the outstanding catalytic activities of Mn 3 O 4 nanozymes and optimizing the TMB concentration, we developed a novel and sensitive colorimetric sensor for Cys detection. Experimental results indicated a detection range for Cys between 0.5 and 45 μM, with a lower limit of detection (LOD) of 0.02636 μM. This established method for detecting Cys reveals significant promise for the advancement of effective sensing systems.
研究领域:
生物化学
·
分析化学
·
纳米技术
·
疾病诊断
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Qikai Huang,Xiongwei Zhong,Qi Zhang,Xin Wu,Miaolun Jiao,Biao Chen,Jinzhi Sheng,Guangmin Zhou
Zinc-air batteries (ZABs) with high energy density and safety are promising as next-generation energy storage systems, while their applications are severely hindered by the sluggish reaction kinetic of air cathodes. Developing a bifunctional catalyst with high activity and durability is an effective strategy to address the above challenges. Herein, a Co 3 O 4 /Mn 3 O 4 nanohybrid with heterointerfaces is designed as advanced cathode catalyst for ZABs. Density functional theory calculations show the heterogeneous interface between Co 3 O 4 /Mn 3 O 4 can improve the dynamics of carrier transport and thus enhancing the catalytic activity and durability. The Co 3 O 4 /Mn 3 O 4 catalyst anchored on reduced graphene oxide (rGO) exhibits high oxygen reduction reaction (ORR) activity with a half-wave potential of 0.86 V, and excellent oxygen evolution reaction (OER) activity with the potential of 1.59 V at 10 mA cm −2 , which are comparable to the commercial noble metal catalysts. The improved ORR/OER catalytic activity is ascribed to the synergistic effect of heterointerfaces between Co 3 O 4 and Mn 3 O 4 as well as the improved conductivity and contact area of oxygen/catalysts/electrolytes three-phase interface by rGO. Furthermore, a home-made ZAB based on Co 3 O 4 /Mn 3 O 4 /rGO shows a high open circuit voltage of 1.54 V, a large power density of 194.6 mW cm −2 and good long-term cycling stability of nearly 400 h at 5 mA cm −2 , which affords a promising bifunctional oxygen catalyst for rechargeable ZABs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 14
·1672-1680
·
IF 2.896
Yalin Wu,Liping Lu,Zhihui Yu,Xiayan Wang
Based on the strategy of increasing the number of oxygen vacancies to improve the catalytic performance, we have developed a novel electrochemical sensor based on the multivalent metal oxides cerium dioxide and manganous oxide (Mn3O4/CeO2) for reliable determination of extracellular hydrogen peroxide (H2O2) released from living cells. The Mn3O4/CeO2 nanocomposite was characterized by high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrochemical performance of the Mn3O4/CeO2 nanocomposite modified glassy carbon electrode (Mn3O4/CeO2/GCE) was investigated. Owing to the abundant oxygen vacancies and strong synergistic effect between the multivalent Ce and Mn, the sensor exhibited excellent catalytic activity and selectivity for the electrochemical detection of H2O2 with a low quantitation limit of 2 nM. Moreover, Mn3O4/CeO2/GCE exhibited excellent reproducibility, repeatability, and long-term storage stability. Because of these remarkable analytical advantages, the constructed sensor was able to determine H2O2 released from living cells with satisfactory results. The results showed that the Mn3O4/CeO2 sensor is a promising candidate for a nanoenzymatic H2O2 sensor with the possibility of applications in physiology and diagnosis.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYST
·
2022
·Vol. 147
·期 10
·2097-2105
·
IF 5.227
Xinyue Guo,Weiqi Zhou,Yanxue Guan,Juan Qin,Bailin Zhang,Miaomiao Zhang,Jilin Tang
Manganese-based nanozymes have been widely used in the field of cell protection due to their various enzyme-mimicking activities, but their effect on the mechanical properties of cells is not yet known. Here, bovine serum albumin-modified Mn3O4 nanoparticles (BSA-Mn3O4 NPs) with good biocompatibility were synthesized by a one-step biomineralization method using BSA as a template. BSA-Mn3O4 NPs possess scavenging activity against superoxide free radicals (O2˙−), hydroxyl radicals (˙OH) and hydrogen peroxide (H2O2). The excellent reactive oxygen species (ROS) scavenging activity of BSA-Mn3O4 NPs enables them to effectively reduce the intracellular ROS level, thus mitigating the damage of oxidative stress on human umbilical vein endothelial cells (HUVECs). Subsequently, the intracellular antioxidant mechanism of the BSA-Mn3O4 NPs was further investigated. The results show that the BSA-Mn3O4 NPs could inhibit the depolymerization of F-actin, help cells maintain their normal morphology, and reduce the decrease in Young's modulus of cells caused by oxidative stress.
研究领域:
纳米技术
·
细胞生物学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）