In this study,intelligent,pH-responsive colorimetric films were prepared by encapsulating anthocyanins in nanocomplexes prepared from glutenin and carboxymethyl chitosan.These nanocomplexes were added to a corn starch...In this study,intelligent,pH-responsive colorimetric films were prepared by encapsulating anthocyanins in nanocomplexes prepared from glutenin and carboxymethyl chitosan.These nanocomplexes were added to a corn starch matrix and used in the freshness monitoring of chilled pork.The effects of anthocyanin-loaded nanocomplexes on the physical,structural,and functional characteristics of the films were investigated.The addition of anthocyanin-loaded nanocomplexes increased the tensile strength,elongation at break,hydrophobicity,and light transmittance of the films while decreasing their water vapor permeability.This is because new hydrogen bonds are formed between the film components,resulting in a more homogeneous and dense structure.The colorimetric film has a significant color response to pH changes.These films were used in experiments on the freshness of chilled pork,in which the pH changes with changing freshness states.The results show that the colorimetric film can monitor changes in the freshness of chilled pork in real time,where orange,pink,and green represent the fresh,secondary fresh,and putrefied states of pork,respectively.Therefore,the intelligent colorimetric film developed in this study has good application potential in the food industry.展开更多
MXenes have attracted great interest in various fields,and pillared MXenes open a new path with larger interlayer spacing.However,the further study of pillared MXenes is blocked at multilayered state due to serious re...MXenes have attracted great interest in various fields,and pillared MXenes open a new path with larger interlayer spacing.However,the further study of pillared MXenes is blocked at multilayered state due to serious restacking phenomenon of few-layered MXene nanosheets.In this work,for the first time,we designed a facile NH4+method to fundamentally solve the restacking issues of MXene nanosheets and succeeded in achieving pillared few-layered MXene.Sn nanocomplex pillared few-layered Ti3C2Tx(STCT)composites were synthesized by introducing atomic Sn nanocomplex into interlayer of pillared few-layered Ti3C2Tx MXenes via pillaring technique.The MXene matrix can inhibit Sn nanocomplex particles agglomeration and serve as conductive network.Meanwhile,the Sn nanocomplex particles can further open the interlayer spacing of Ti3C2Tx during lithiation/delithiation processes and therefore generate extra capacity.Benefiting from the“pillar effect,”the STCT composites can maintain 1016 mAh g^?1 after 1200 cycles at 2000 mA g^?1 and deliver a stable capacity of 680 mAh g^?1 at 5 A g^?1,showing one of the best performances among MXene-based composites.This work will provide a new way for the development of pillared MXenes and their energy storage due to significant breakthrough from multilayered state to few-layered one.展开更多
Mesoporous titanium nanoparticles(MTNs) have emerged as an important porous semiconductor owning to their large surface area and unique electronic/optical properties. However, the fundamental research for rational man...Mesoporous titanium nanoparticles(MTNs) have emerged as an important porous semiconductor owning to their large surface area and unique electronic/optical properties. However, the fundamental research for rational manufacturing MTNs in a highly scalable manner remains a challenge. In this study, we report a two-step flash nanocomplexation(FNC) approach to large-scalable generate MTNs through the sequential combination of two multi-inlet vortex mixers. By optimizing the concentrated titanium precursor,polyethylene glycol(PEG)-functionalized silane amount and p H, we have been able to produce MTNs with small particle size(31.5 nm), larger surface area(416.9 m^(2)/g) and pore volume(0.59 cm^(3)/g). Different from the traditional MTNs bulk, FNC-produced MTNs exhibited well-controlled manner and exceptional photocatalytic and antibacterial properties. Importantly, the optimized MTNs outperformed commercial P25 not only in protecting ultraviolet A(UVA)-exposed skin, but also in treating P. aeruginosa-infected wound. We believe that the high controllability and scalability of sequential flash nanocomplexation method offers great opportunities in enhancing the performance of mesoporous titanium nanoparticles.展开更多
Curcumin, commonly used as a coloring agent as well as food additive, has exhibited great therapeutic efficacy for development of functional foods. In order to expand its applications in food, strategies are needed to...Curcumin, commonly used as a coloring agent as well as food additive, has exhibited great therapeutic efficacy for development of functional foods. In order to expand its applications in food, strategies are needed to tackle the poor water-solubility, bioavailability and bioaccessibility of curcumin. Nanoparticles made from individual biomaterials such as proteins, polysaccharides and lipids have been introduced and their properties have been comprehensively studied. Recently, there has been an increasing interest in nanocomplexes made from two or more biomaterials because of their ability to composite the advantages of various components. This review has specific focus on the nanocomplexes fabricated from proteins and polysaccharides. First, complexation methods with or without chemical covalent bond formation are summarized, while different methods with different degrees of complexation are discussed. The encapsulation strategies of curcumin, both traditional and newly invented, are also compared. Then, the structure and physicochemical properties of the resulting binary or ternary nanocomplexes are discussed in detail, as well as a comparison of the delivery efficiency. Last but not least, the current limitations and future directions in the development of curcumin-loaded biopolymer nanoparticles for the design of future food products are presented.展开更多
Protein corona refers to the structure composed of biomolecules adsorbed on the surface of nanomaterials.The study on the effect of the interaction between protein and nanoparticles can provide an important guide for ...Protein corona refers to the structure composed of biomolecules adsorbed on the surface of nanomaterials.The study on the effect of the interaction between protein and nanoparticles can provide an important guide for the application of nanodrug delivery.To provide a reference for the research on fullerene(C60)nanocomplex drug delivery systems,this work studied the interaction between C60 nanocomplex and a variety of plasma proteins.Research showed that the protein binding with C60 nanocomplex did not change the charge properties of protein.The proteins induced the aggregation of C60 nanocomplex.The circular dichroism spectra showed that the secondary structure of the proteins changed after binding to C60 nanocomplex.The ultraviolet-visible spectra showed that the effect of C60 nanocomplex on proteins was concentration-dependent.The fluorescence spectra showed that C60 nanocomplex could intrinsic fluorescence alteration of proteins.The adsorption capacity of C60 nanocomplex to proteins was changed at 0 h and 4 h.The interaction between nanocomplex and proteins might affect the morphological characteristics of nanocomplex and the conformation of proteins.This work could provide a reference for the research and development of C60 nanocomplex and other carbon-based nanocomplex as nanoparticulate drug delivery systems.展开更多
The emerging technique of photoacoustic imaging,especially in the near infra-red(NIR)window,permits high resolution,deep-penetration,clinically reliable sensing.However,few contrast agents are available that can speci...The emerging technique of photoacoustic imaging,especially in the near infra-red(NIR)window,permits high resolution,deep-penetration,clinically reliable sensing.However,few contrast agents are available that can specifically respond to intricate biological environments,and which are biodegradable and biocompatible.Herein,we in troduce a new class of pH-sensitive orga nic photoacoustic con trast age nt that operates in the second NIR window(NIR-II,960-1,700 nm),which is derived from the self-assembled charge-transfer nanocomplex(CTN)by 3,3',5,5'-tetramethylbenzidine(TMB)and its dication structure(TMB++).The unique NIR-ll-responsive CTN can specifically respond to pH change in the physiological range and allows noninvasive and sensitive visualization of the tumor acidic microenvironment(e.g.at pH5)in mice with higher signal-to-noise ratio.The CTN is biodegradable under physiological conditions(e.g.pH 7.4),which alleviates the biosafety concern of nan oparticle accumulati on in vivo.These results clearly show the pote ntial of the TMB/TMB++-based CTN as a promisi ng pH-activated and biodegradable molecular probe for specific tumor photoacoustic imaging in the NIR-II region.展开更多
制备了CMC/Eu(Ⅲ)、CMC/Tb(Ⅲ)、HPCMC/Eu(Ⅲ)、HPCMC/Tb(Ⅲ)纳米复合物,通过XPS、UV-Vis、流变学检测及TG-DSC研究了产物的"天线效应"、荧光性质、静态/动态流变性质以及热性质.XPS结果表明,Eu^(3+)、Tb^(3+)与CMC、HPCMC均...制备了CMC/Eu(Ⅲ)、CMC/Tb(Ⅲ)、HPCMC/Eu(Ⅲ)、HPCMC/Tb(Ⅲ)纳米复合物,通过XPS、UV-Vis、流变学检测及TG-DSC研究了产物的"天线效应"、荧光性质、静态/动态流变性质以及热性质.XPS结果表明,Eu^(3+)、Tb^(3+)与CMC、HPCMC均生成Ln(Ⅲ)—O,而且产物的紫外吸收与其激发光谱有重叠,证明纤维素衍生物所吸收的能量可以成功地转移到稀土金属,使之发光;流变学性能研究结果表明,前述4种纳米复合物溶液均为假塑性流体,黏流活化能分别为1.5964、2.5193、1.6047和1.4218 k J/mol,其黏度对温度具有依赖性;溶液的储能模量和损耗模量均随角频率的增大而增大;纳米复合物与CMC-Na、HPCMC-Na有相似的热性质,且HPCMC侧链更易与水通过氢键结合.展开更多
基金funded by the Hainan Provincial Natural Science Foundation of China[Grant Number 2019RC031]National Natural Science Foundation of China[Grant Number 31460407].
文摘In this study,intelligent,pH-responsive colorimetric films were prepared by encapsulating anthocyanins in nanocomplexes prepared from glutenin and carboxymethyl chitosan.These nanocomplexes were added to a corn starch matrix and used in the freshness monitoring of chilled pork.The effects of anthocyanin-loaded nanocomplexes on the physical,structural,and functional characteristics of the films were investigated.The addition of anthocyanin-loaded nanocomplexes increased the tensile strength,elongation at break,hydrophobicity,and light transmittance of the films while decreasing their water vapor permeability.This is because new hydrogen bonds are formed between the film components,resulting in a more homogeneous and dense structure.The colorimetric film has a significant color response to pH changes.These films were used in experiments on the freshness of chilled pork,in which the pH changes with changing freshness states.The results show that the colorimetric film can monitor changes in the freshness of chilled pork in real time,where orange,pink,and green represent the fresh,secondary fresh,and putrefied states of pork,respectively.Therefore,the intelligent colorimetric film developed in this study has good application potential in the food industry.
基金the National Natural Science Foundation of China(Grant No.51901206,51822104)the Training Program of Major Basic Research Project of Provincial Natural Science Foundation of Guangdong(2017B030308001).
文摘MXenes have attracted great interest in various fields,and pillared MXenes open a new path with larger interlayer spacing.However,the further study of pillared MXenes is blocked at multilayered state due to serious restacking phenomenon of few-layered MXene nanosheets.In this work,for the first time,we designed a facile NH4+method to fundamentally solve the restacking issues of MXene nanosheets and succeeded in achieving pillared few-layered MXene.Sn nanocomplex pillared few-layered Ti3C2Tx(STCT)composites were synthesized by introducing atomic Sn nanocomplex into interlayer of pillared few-layered Ti3C2Tx MXenes via pillaring technique.The MXene matrix can inhibit Sn nanocomplex particles agglomeration and serve as conductive network.Meanwhile,the Sn nanocomplex particles can further open the interlayer spacing of Ti3C2Tx during lithiation/delithiation processes and therefore generate extra capacity.Benefiting from the“pillar effect,”the STCT composites can maintain 1016 mAh g^?1 after 1200 cycles at 2000 mA g^?1 and deliver a stable capacity of 680 mAh g^?1 at 5 A g^?1,showing one of the best performances among MXene-based composites.This work will provide a new way for the development of pillared MXenes and their energy storage due to significant breakthrough from multilayered state to few-layered one.
基金supported by the National Natural Science Foundation of China (No.32271388)。
文摘Mesoporous titanium nanoparticles(MTNs) have emerged as an important porous semiconductor owning to their large surface area and unique electronic/optical properties. However, the fundamental research for rational manufacturing MTNs in a highly scalable manner remains a challenge. In this study, we report a two-step flash nanocomplexation(FNC) approach to large-scalable generate MTNs through the sequential combination of two multi-inlet vortex mixers. By optimizing the concentrated titanium precursor,polyethylene glycol(PEG)-functionalized silane amount and p H, we have been able to produce MTNs with small particle size(31.5 nm), larger surface area(416.9 m^(2)/g) and pore volume(0.59 cm^(3)/g). Different from the traditional MTNs bulk, FNC-produced MTNs exhibited well-controlled manner and exceptional photocatalytic and antibacterial properties. Importantly, the optimized MTNs outperformed commercial P25 not only in protecting ultraviolet A(UVA)-exposed skin, but also in treating P. aeruginosa-infected wound. We believe that the high controllability and scalability of sequential flash nanocomplexation method offers great opportunities in enhancing the performance of mesoporous titanium nanoparticles.
文摘Curcumin, commonly used as a coloring agent as well as food additive, has exhibited great therapeutic efficacy for development of functional foods. In order to expand its applications in food, strategies are needed to tackle the poor water-solubility, bioavailability and bioaccessibility of curcumin. Nanoparticles made from individual biomaterials such as proteins, polysaccharides and lipids have been introduced and their properties have been comprehensively studied. Recently, there has been an increasing interest in nanocomplexes made from two or more biomaterials because of their ability to composite the advantages of various components. This review has specific focus on the nanocomplexes fabricated from proteins and polysaccharides. First, complexation methods with or without chemical covalent bond formation are summarized, while different methods with different degrees of complexation are discussed. The encapsulation strategies of curcumin, both traditional and newly invented, are also compared. Then, the structure and physicochemical properties of the resulting binary or ternary nanocomplexes are discussed in detail, as well as a comparison of the delivery efficiency. Last but not least, the current limitations and future directions in the development of curcumin-loaded biopolymer nanoparticles for the design of future food products are presented.
基金supports from National Natural Science Foundation of China (grant Nos.82073774 and 82104070)。
文摘Protein corona refers to the structure composed of biomolecules adsorbed on the surface of nanomaterials.The study on the effect of the interaction between protein and nanoparticles can provide an important guide for the application of nanodrug delivery.To provide a reference for the research on fullerene(C60)nanocomplex drug delivery systems,this work studied the interaction between C60 nanocomplex and a variety of plasma proteins.Research showed that the protein binding with C60 nanocomplex did not change the charge properties of protein.The proteins induced the aggregation of C60 nanocomplex.The circular dichroism spectra showed that the secondary structure of the proteins changed after binding to C60 nanocomplex.The ultraviolet-visible spectra showed that the effect of C60 nanocomplex on proteins was concentration-dependent.The fluorescence spectra showed that C60 nanocomplex could intrinsic fluorescence alteration of proteins.The adsorption capacity of C60 nanocomplex to proteins was changed at 0 h and 4 h.The interaction between nanocomplex and proteins might affect the morphological characteristics of nanocomplex and the conformation of proteins.This work could provide a reference for the research and development of C60 nanocomplex and other carbon-based nanocomplex as nanoparticulate drug delivery systems.
基金the financial supports from NTU-AIT-MUV NAM/16001,RG110/16(S),(RG 11/13)and(RG 35/15)awarded in Nanyang Technological University and the National Natural Science Foundation of China(NSFC)(No.51628201).
文摘The emerging technique of photoacoustic imaging,especially in the near infra-red(NIR)window,permits high resolution,deep-penetration,clinically reliable sensing.However,few contrast agents are available that can specifically respond to intricate biological environments,and which are biodegradable and biocompatible.Herein,we in troduce a new class of pH-sensitive orga nic photoacoustic con trast age nt that operates in the second NIR window(NIR-II,960-1,700 nm),which is derived from the self-assembled charge-transfer nanocomplex(CTN)by 3,3',5,5'-tetramethylbenzidine(TMB)and its dication structure(TMB++).The unique NIR-ll-responsive CTN can specifically respond to pH change in the physiological range and allows noninvasive and sensitive visualization of the tumor acidic microenvironment(e.g.at pH5)in mice with higher signal-to-noise ratio.The CTN is biodegradable under physiological conditions(e.g.pH 7.4),which alleviates the biosafety concern of nan oparticle accumulati on in vivo.These results clearly show the pote ntial of the TMB/TMB++-based CTN as a promisi ng pH-activated and biodegradable molecular probe for specific tumor photoacoustic imaging in the NIR-II region.
文摘制备了CMC/Eu(Ⅲ)、CMC/Tb(Ⅲ)、HPCMC/Eu(Ⅲ)、HPCMC/Tb(Ⅲ)纳米复合物,通过XPS、UV-Vis、流变学检测及TG-DSC研究了产物的"天线效应"、荧光性质、静态/动态流变性质以及热性质.XPS结果表明,Eu^(3+)、Tb^(3+)与CMC、HPCMC均生成Ln(Ⅲ)—O,而且产物的紫外吸收与其激发光谱有重叠,证明纤维素衍生物所吸收的能量可以成功地转移到稀土金属,使之发光;流变学性能研究结果表明,前述4种纳米复合物溶液均为假塑性流体,黏流活化能分别为1.5964、2.5193、1.6047和1.4218 k J/mol,其黏度对温度具有依赖性;溶液的储能模量和损耗模量均随角频率的增大而增大;纳米复合物与CMC-Na、HPCMC-Na有相似的热性质,且HPCMC侧链更易与水通过氢键结合.
