FITOTERAPIA
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2023
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IF 3.4
Dan Huang,Fanghua Li,Anquan Yang,Jing Wang,Min Xie,Meiling Mao,Jing Li,Xiaoli Zhang,Qingli Qu,Ranhua Xiong,Chaobo Huang
The study on the extraction conditions, purification, and biological activity of slash pine ( Pinus elliottii. ) is important for the development of slash pine resources. The optimal process conditions for the extraction of slash pine polysaccharide (SPP) were determined, resulting in a liquid-solid ratio of 66.94 mL/g, extraction temperature of 83.74 °C and extraction time of 2.56 h by using the response surface methodology, and the yield of SPP was 5.99% under the optimized conditions. Following the purification of SPP, the SPP-2 component was obtained and its physicochemical properties, functional group composition, antioxidant capacity, and moisturizing capacity were determined. Structural analysis suggested that SPP-2 has a molecular weight of 118.407 kDa, and was composed of rhamnose, arabinose, fucose, xylose, mannose, glucose, and galactose in a ratio of 5.98: 14.34: 1: 1.75: 13.50: 3.43: 15.79. The antioxidant activity analysis showed that SPP-2 has good free radical scavenging activity, and it was also found to have in vitro moisturizing activity and low irritation. These results suggest that SPP-2 has the potential for applications in the pharmaceutical, food, and cosmetic industries.
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REACTIVE & FUNCTIONAL POLYMERS
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2023
·
IF 5.1
Xulian Hu,Shaoxian Chen,Hu Wang,Zhao-Xi Zhou,Jinbiao Min,Qihui Chen,Maochun Hong,Heqing Fu
Hydrogels are important materials for mechanical sensors of artificial intelligence, and their good electrical conductivity and mechanical properties have broad application space in the field of multifunctional materials. However, it is still a challenge to prepare hydrogels with excellent conductivity and sensing, anti-freezing and water retention, resilience and fatigue resistance . Herein, chitosan/poly(acrylic acid-acrylamide‑sodium p-styrenesulfonate)/glycerol/samarium hydrate (C/P/G/S) double-network (DN) hydrogels were prepared by Interpenetrating Polymer Networks (IPNs) of chitosan (CS) with acrylic acid (AA), acrylamide (AM), sodium p-styrenesulfonate (SSS), glycerol (GL) and samarium hydrate (SH) under ultraviolet (UV) light. The C/P/G/S DN hydrogels have satisfactory mechanical properties , conductivity, mechanical strain sensing performances, water retention and frost resistance capacities. Specially, the compressive stress of hydrogels at 80% compressive strain is up to 1.7 MPa. It also shows preeminent fatigue resistance and resilience in continuous cyclic stretching and cyclic compression (5 and 100 times). The conductivity of the hydrogels can reach 1.9 S/m when the SH is 1.8 g. Meanwhile, mechanical strain sensing tests of the hydrogels at room temperature and low temperature were also performed simultaneously. The hydrogels have stable mechanical strain sensing properties and good electrical conductivity even at −20 °C. More importantly, when C/P/G/S DN hydrogels were placed at room temperature and ventilated for 30 days, the water loss rate of hydrogels was only 13.9%.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Ibrahim Khalifa,Krisana Nilsuwan,Thummanoon Prodpran,Soottawat Benjakul
The effect of the covalent binding between anthocyanins extracted from purple potato peels and beta-lactoglobulin (β-Lg) on its ability to fabricate a green/smart halochromic biosensor combined with pullulan (Pul) was studied. The physical, mechanical, colorimetry, optical, morphological, stability, functionality, biodegradability , and applicability of β-Lg/Pul/Anthocyanin biosensors to monitor the Barramundi fish's freshness during storage were entirely evaluated. The docking and multispectral results proved that β-Lg could be successfully phenolated with anthocyanins and subsequently interacted with Pul via H-bonding and other forces which mainly subsequently form the smart biosensors. Phenolation with anthocyanins significantly heightened the mechanical, moisture resistance, and thermal steadiness of β-Lg/Pul biosensors. Anthocyanins also nearly duplicated the bacteriostatic and antioxidant activities of β-Lg/Pul biosensors. The biosensors changed the color associated with the loss in freshness of the Barramundi fish, mostly due to the ammonia production and pH-alteration throughout fish deterioration. Most importantly, β-Lg/Pul/Anthocyanin biosensors are biodegradable and decomposed within ∼30 d of simulated environmental circumstances. Overall, β-Lg/Pul/Anthocyanin smart biosensors could minimize the usage of plastic packaging materials and employ to monitor the freshness of stored fish and fish-stuffs.
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JOURNAL OF CATALYSIS
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2023
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IF 7.3
Guorui Liu,Rong Cai,Zhenli Lv,Guorui Ma,Jing Li,Jun Jin,Xin Zhong,Feng Li
Low light absorption efficiency and short carrier diffusion length mainly restrict the use of CuBi 2 O 4 as a photocathode for an efficient photoelectrocatalytic CO 2 reduction reaction (PEC-CO 2 RR). These inadequacies are alleviated by fabricating CuBi 2 O 4 inverse opal photocathode modify with plasmonic Ag nanoparticles (CuBi 2 O 4 IOs-Ag) by using a sacrificing template method. The CuBi 2 O 4 IOs-Ag photocathode exhibits superior PEC-CO 2 RR-to-CO performance with a Faraday efficiency (FE) of 92% at 0.2 V versus reversible hydrogen electrode, and this value is roughly 1.6 times that of the pristine CuBi 2 O 4 thin film. Detail characterization and experiments reveal that the exceptional three-dimensional (3D) order structure simultaneously accelerates the mass transfer rates and enhances the light-harvesting efficiency. In addition, the introduction of Ag nanoparticles remarkably improves the surface charge distribution by forming an ohmic contact with CuBi 2 O 4 . Consequently, carrier recombination is efficiently inhibited, and the carrier dynamics behavior is improved. This work provides important insights into the design of high-performance photoelectrocatalytic systems for CO 2 reduction by engineering the microstructure of catalysts with localized surface plasmon resonance effect.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
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IF 4.5
Yajing Fu,Jiahao Zhang,Hairui Wang,Lijuan Tao,Shaoqing Liu,Yingxi Wang,Shiquan Wang,Jianwen Liu
Developing anode materials with high specific capacity, excellent rate performance and cycling performance is of great significance. Herein, transition metal oxides (TMOs) have been aroused much interest owing to their low cost, large theoretical capacity and chemical stability. In this work, the bimetallic oxides CoFe 2 O 4 /C composite is synthesized by solvothermal and subsequent annealing process. When used as the anode for lithium ion batteries , the CoFe 2 O 4 /C microspheres exhibit a reversible specific capacity of 1270 mAh g −1 at 100 mA g −1 after 100 cycles and about 500 mAh g −1 at a high current density of 1.0 A g −1 after 1000 cycles. These satisfactory electrochemical properties are mainly attributed to the unique yolk structure, the synergistic effect of two metal ions , carbon coating and small nanoparticles of CoFe 2 O 4 /C. This work provides an effective synthesis method for mixed TMOs with high-performance lithium storage for LIB applications.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Xiaoyong Zhang,Meiyue Jin,Liping Ding,Jinmei He,Yongping Bai,Lidong Zhang
Inspired by nature, hydrogel actuators are important for designing soft robots and become one of the most essential components of intelligent research. However, classical actuation method, such as Near-Infrared (NIR) light stimulates the actuator to complete the motions then it automatically recovers original state when the light is off, cannot provide continuous in situ dynamic motion stay and recovery under one NIR light. In this study, a novel network-polycaprolactone (Net-PCL)-poly N -isopropylacrylamide (PNIPAM) hydrogel actuator (Net-PCL-Gel) is proposed through a layer-by-layer stacking technology, leading to the co-existence of Net-PCL with photoinduced shape memory capability and PNIPAM hydrogel segments showing de-swelling/swelling phase transition. Owing to the shape memory property of Net-PCL, the Net-PCL-Gel exhibits in situ dynamic bending and recovering stay behavior in response to NIR irradiation with the active force of PNIPAM. Different from the conventional hydrogel system, the Net-PCL-Gel also displayed remarkable decryption performance in information reading and hiding, while retaining excellent accuracy and stability. Due to its simplicity, this strategy shows great potential for the biomimetic operation of soft grippers and multifunctional actuators.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 31
·e54231
·
IF 3
Jizhen Liu,Bin Li,Aolin Wu,Haibo Qin,Xiaojia Xu,Shilin Yan
The development of elastomers from renewable raw material resources, with excellent properties, has been a major and difficult area of research. In this work, ternary polymerizable deep eutectic monomers (DEMs) were synthesized from acrylamide, choline chloride, and glycerol (Gy). A series of mixed hydrogels were prepared in 15 min through thermal initiation in DEM using a frontal chemical change. The eutectic gel exhibited good mechanical and self-healing properties, and the mechanical and self-healing properties of the target gel could be regulated by adjusting the proportion of Gy, while the eutectic gel could maintain high elongation and self-healing efficiency at low temperatures. Additional, eutectic gels could be compressed to a strain of more than 80% and could immediately recover to their original state when the compression force was released. In the cyclic compression test, the eutectic gel cyclic compression curves showed a high degree of overlap, and no significant hysteresis was observed, even at a set strain of 80% and 100 cyclic compression times. In addition, the eutectic gel showed fine ionic conductivity, and both the water content and Gy content could affect its conductivity, giving it the potential to be used in the application of manufacturing pressure-sensitive sensors.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Xiaoli Zhang,Qingli Qu,Anquan Yang,Jing Wang,Weixia Cheng,Aying Zhou,Ranhua Xiong,Chaobo Huang
Bacterial infections pose a serious threat to public health, causing worldwide morbidity and about 80 % of bacterial infections are related to biofilm. Removing biofilm without antibiotics remains an interdisciplinary challenge. To solve this problem, we presented a dual-power driven antibiofilm system Prussian blue composite microswimmers based on alginate-chitosan, which designed into an asymmetric structure to achieve self-driven in the fuel solution and magnetic field. Prussian blue embedded in the microswimmers given it the ability to convert light and heat, catalyze Fenton reaction, and produce bubbles and reactive oxygen species. Moreover, with the addition of Fe 3 O 4 , the microswimmers could move in group under external magnetic field. The composite microswimmers displayed excellent antibacterial activity against S. aureus biofilm with an efficiency as high as 86.94 %. It is worth mentioning that the microswimmers were fabricated with device-simple and low-cost gas-shearing method. This system integrating physical destruction, chemical damage such chemodynamic therapy and photothermal therapy, and finally kill the plankton bacteria embedded in biofilm. This approach may cause an autonomous, multifunctional antibiofilm platform to promote the present most areas with harmful biofilm difficult to locate the surface for removal.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Amer Ali Mahdi,Qais Ali Al-Maqtari,Waleed Al-Ansi,Wei Hu,Sulafa B.H. Hashim,Haiying Cui,Lin Lin
This study evaluated the effects of adding various concentrations (0 %, 1 %, 2 %, and 3 %) of peach gum (PG) to films made from polyethylene oxide (PEO) combined with Litsea cubeba essential oil (LCEO) to be utilized as active packaging for food in the future. The findings showed that the film containing PG 2 % concentration had the best physic-mechanical properties. In films made with PG, the glass transition temperature was significantly improved. Combining PG and PEO resulted in films that were brighter in color, had lower WVP values, and had the lowest water activity. Furthermore, XRD demonstrated that PG additions were compatible with the film of PEO blended with LCEO. The PG films formulated with PG presented high antioxidant and antibacterial activity against Staphylococcus aureus and E. coli . Wrapping beef with P2G2 film led to maintaining its quality with suitable levels of pH, TBARS , and TVB-N. This also decreased the number of E. coli and S. aureus in beef throughout the storage period. The results indicate that adding PG to PEO films enhances their suitability for food preservation.
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Jiajia Long,Yuting Qian,Wenrou Tian,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jianmei Lu
The insufficient active sites, low separation efficiency of free carriers and poor capacity to generate active free radicals are limitations of asymmetrical BiFeO 3 in piezocatalysis. To address these issues, BiFeO 3 hollow nanospheres with exposed abundant catalytic active sites were fabricated via a solvothermal method for the first time. In addition, surface iodine-grafting was introduced, resulting in a local electric field and the conduction band potential of BiFeO 3 closer to the O 2 /·O 2 – redox potential (-0.33 eV). It facilitated charge transmission and active species generation to remove bisphenol A under ultrasonic vibration. Thus, the iodine-grafted BiFeO 3 hollow nanospheres could completely degrade 20 mL bisphenol A (10 ppm) within 60 min with a relatively fast rate constant of 0.153 min −1 , which was 4.5 times higher than that of un-grafted BiFeO 3 . This work provides a feasible approach to construct efficient piezocatalysts for industrial wastewater purification.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2023
·
IF 5
Deng Hong,Du Zhengda,Lu Surui,Wang Zhaoyue,He Xiuping
Abstract Cat8 is a C6 zinc cluster transcription activator in yeast. It is generally recognized that the transcription of CAT8 is inhibited and that Cat8 is inactive in the presence of high concentrations of glucose. However, our recent study found that constitutively overexpressed Cat8 played a regulatory role in Saccharomyces cerevisiae in the presence of 20 g/L glucose . To explore the regulatory network of Cat8 at high glucose concentrations, CAT8 was both overexpressed and deleted in this study. Cell growth and glucose consumption in different media were significantly accelerated by the deletion of CAT8 , while the lag period was greatly shortened. RNA-seq and genetic modification showed that the deletion of CAT8 changed the type of energy metabolism in yeast cells. Many genes related to the mitochondrial respiratory chain were downregulated, resulting in a reduction in aerobic respiration and the tricarboxylic acid cycle. Meanwhile, both the energy supply of anaerobic ethanol fermentation and the Crabtree effect of S. cerevisiae were enhanced by the deletion of CAT8 . CAT8 knockout cells show a higher sugar uptake rate, a higher cell growth rate, and higher tolerance to glucose than the wild-type strain YS58. This study expands the understanding of the regulatory network of Cat8 and provides guidance for modulating yeast cell growth. Key points • The deletion of CAT8 promoted cell growth of S. cerevisiae. • Transcriptome analysis revealed the regulation network of Cat8 under 1% glucose condition. • CAT8 deletion increases the glucose tolerance of cells by enhancing the Crabtree effect.
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Nature Protocols
·
2023
·Vol. 18
·期 7
·2032-2050
·
IF 14.8
Chen Guosheng,Huang Siming,Ma Xiaomin,He Rongwei,Ouyang Gangfeng
Enzymes are outstanding natural catalysts with exquisite 3D structures, initiating countless life-sustaining biotransformations in living systems. The flexible structure of an enzyme, however, is highly susceptible to non-physiological environments, which greatly limits its large-scale industrial applications. Seeking suitable supports to immobilize fragile enzymes is one of the most efficient routes to ameliorate the stability problem. This protocol imparts a new bottom-up strategy for enzyme encapsulation using a hydrogen-bonded organic framework (HOF-101). In short, the surface residues of the enzyme can trigger the nucleation of HOF-101 around its surface through the hydrogen-bonded biointerface. As a result, a series of enzymes with different surface chemistries are able to be encapsulated within a highly crystalline HOF-101 scaffold, which has long-range ordered mesochannels. The details of experimental procedures are described in this protocol, which involve the encapsulating method, characterizations of materials and biocatalytic performance tests. Compared with other immobilization methods, this enzyme-triggering HOF-101 encapsulation is easy to operate and affords higher loading efficiency. The formed HOF-101 scaffold has an unambiguous structure and well-arranged mesochannels, favoring mass transfer and understanding of the biocatalytic process. It takes ~13.5 h for successful synthesis of enzyme-encapsulated HOF-101, 3–4 d for characterizations of materials and ~4 h for the biocatalytic performance tests. In addition, no specific expertise is necessary for the preparation of this biocomposite, although the high-resolution imaging requires a low-electron-dose microscope technology. This protocol can provide a useful methodology to efficiently encapsulate enzymes and design biocatalytic HOF materials.
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