Jiangnan University

Caihua Ni

Liping Zhang

Gang Shi

Ren Liu

Xinxin Sang

Ying Li

Dawei Wang

Gang Wang

Jingguo Yang

Xuan Jin

Likui Wang

He Liu

Jie Chen

Lifeng Chi

Nan Lv

Jianhua Li

Xinyi Dong

Yuanyuan Ding

Zhenle Tian

Yamin Zhou

Lei Tao

Yi Zhu

Wenlong Wang

Hongyan Miao

Xiaofeng Xia

Fei He

The invention provides a making method of modified polyvinyl alcohol embolic microspheres. First, polyvinyl alcohol dimethyl sulfoxide solution is added to acryloyl chloride dichloromethane solution for reaction, then taurine solution is added to the above solution for further reaction, so that functional groups are introduced into the side chains of polyvinyl alcohol, then blank microspheres are prepared by suspension crosslinking method, and finally, drug-loaded modified polyvinyl alcohol embolic microspheres are prepared. The invention aims at improving the drug loading rate and drug loading speed of the microspheres. Through modification, the crystallinity of polyvinyl alcohol is weakened, the swelling in water is accelerated, and the application effect of the microspheres is improved.

Method for making modified polyvinyl alcohol embolic microsphere

A method for making xanthan gum copolymer nanomicelles comprising: 1) degrading xanthan gum in aqueous solution to obtain degraded xanthan gum; 2) preparing xanthan gum bromide from the degraded xanthan gum; 3) preparing xanthan gum copolymer from the xanthan gum bromide and 4) making the gum copolymer nanomicelles from the xanthan gum copolymer. The xanthan gum copolymer nanomicelles have good morphological regularity, good biocompatibility and stable performance as an anticancer drug carriers.

Method for preparation of xanthan gum copolymer nanomicelles

A method for making reduction sensitive nano micelles comprising: 1) dissolving taurine in distilled water, and adding sodium hydroxide solution; 2) dissolving acryloyl chloride in dichloromethane, reacting at 25&#xb0; C.; dissolving lipoic acid in toluene and adding hydroxyethyl methacrylate, reacting at 85&#xb0; C.; 3) dissolving N-acryloyltaurine and lipoic acid methacryloyloxyethyl ester and reacting at 60&#x2dc;65&#xb0; C., dropping the polymer solution into deionized water, adding dithiothreitol and reacting at 25&#x2dc;30&#xb0; C. to obtain reduction sensitive nano micelles after freeze-drying. The nano micelles have regular morphology and uniform distribution, and can be used as drug carriers for controlled release.

Method for making reduction sensitive nano micelles

The present invention relates to a phenol-based resin adhesive from lignin pyrolysis, comprising a polymer of phenol and formaldehyde from lignin pyrolysis, wherein the phenol from lignin pyrolysis comprises at least two phenols from lignin pyrolysis or at least two lignin-modified phenols from lignin pyrolysis. A repeat unit of the polymer of phenol and formaldehyde from lignin pyrolysis comprises at least two phenol units from lignin pyrolysis or at least two lignin-modified phenol units from lignin pyrolysis. According to the phenol-based resin adhesive from lignin pyrolysis in the present invention, by-products during the pyrolysis of lignin for power generation are used as raw materials, so it is environment-friendly and economical.

Phenol-based resin adhesive from lignin pyrolysis and its preparation method

The present invention discloses a bionic SERS substrate of a metal-based compound eye bowl structure, a construction method and application. The bionic SERS substrate of the metal-based compound eye bowl structure of the present invention consists of a metal bowl and a cone-shaped structure substrate in an ordered hierarchy manner. The metal bowl is of a continuously and closely arranged single-layer bowl structure. A height of the metal bowl is 0.01-10 &#x3bc;m, and a bowl opening diameter is 0.01-10 &#x3bc;m. A cone is a micron pyramid cone, and a height of the micron pyramid cone is 1-100 &#x3bc;m. The present invention assembles the metal bowl on a surface of the substrate of the micron pyramid cone structure with great fluctuation by a solid-liquid interface chemical reduction method and a small ball template method, and further constructs a 3D SERS substrate with a bionic compound eye structure.

Bionic SERS substrate with metal-based compound eye bowl structure and its construction method and application

A method of preparing degradable and environment responsive composite microgels, belonging to polymer material synthesis and biomaterial technology fields. Firstly, a copolymer of L-malic acid and 6-hydroxyhexanoate is prepared; then, N,N,N',N&#x2032;-tetramethyl cystamine is prepared. The copolymer and N,N,N&#x2032;,N&#x2032;-tetramethyl cystamine are mixed in an organic solvent to form a mixed solution which is added into excess distilled water to produce composite microgels. The microgels have advantages of mild preparing conditions, fast reaction speed without catalysts, no impurity remained, and controllable degradation rate. The microgels can load anticancer drug doxorubicin hydrochloride, showing environment responsive controlled release due to introduction of carboxyl groups and disulfide bonds.

Method of preparing degradable and environment responsive composite microgels

The present invention discloses an SERS substrate of a metal-modified semiconductor-based bionic compound eye bowl structure and a construction method, and belongs to the technical field of nano materials. The present invention is based on a multi-time interface self-assembly method. Firstly, a small ball template is constructed by using a gas-liquid interface assembly process. Then, a semiconductor bowl structure array is induced to be formed by the template by using a solid-liquid interface assembly process. Next, a semiconductor bowl is assembled to a surface of a pyramid-shaped cone to form a bionic compound eye structure by using a transfer process. Finally, a surface of the bionic compound eye structure is modified with a layer of uniformly distributed metal particles by a physical deposition method or a chemical deposition method, thereby forming the SERS substrate of the metal-modified semiconductor-based bionic compound eye bowl structure.

SERS substrate of metal-modified semiconductor-based bionic compound eye bowl structure and construction method

The invention discloses a preparation method of pH/reduction responsive polyamino acid zwitterionic nanoparticles, which belongs to the technical field of polymer synthesis and biomedical materials. In the invention aliphatic amines are used to initiate ring-opening polymerization of &#x3b3;-benzyl-L-glutamate-N-carboxylic anhydride, and the obtained poly(&#x3b3;-benzyl-L-glutamate) reacts with L-lysine to form azwitterionic polymer. The zwitterionic polymer is crosslinked by cysteamine, producing pH/reduction responsive polyamino acid zwitterionic nanoparticles after purification. The nanoparticles are pH responsive and resistant to non-specific protein adsorption. Because cysteamine contains disulfide bonds, the nanoparticles have sensitive reductive responsiveness and can load anticancer drugs for controlled release at the target site of cancer.

Method of preparing pH/reduction responsive polyamino acid zwitterionic nanoparticles

The invention relates to a three-dimensional bionic composite material based on refection elimination and double-layer P/N heterojunctions. The preparation method of the composite material comprises: (1) anisotropically etching a silicon wafer with an alkaline solution, to form compactly arranged tetragonal pyramids on the surface of the silicon wafer; (2) performing hydrophilic treatment on the silicon wafer, growing TiO2 crystal seeds on the surface of the silicon wafer, and calcining the silicon wafer in a muffle furnace; (3) putting the silicon wafer obtained in the step (2) into a reaction kettle, and growing TiO2 nano-rods on the side walls of silicon cones by a hydrothermal synthesis method; and (4) depositing PPY nano-particles on the TiO2 nano-rods. The composite material has good refection elimination performance and efficient photogenerated charge separation capability, and is applicable in fields of photo-catalysis, photoelectric conversion devices, solar cells and the like.

Silicon-titanium dioxide-polypyrrole three-dimensional bionic composite material based on hierarchical assembly and use thereof

Hybrid amphiphilic star copolymer nano micelles are prepared in the invention. Cage shaped octa(&#x3b3;-aminopropyl) silsesquioxanes is selected as the inorganic part, and L-glutamic benzyl ester&#x2014;five membered ring anhydride is ring-opening polymerized by the initiation of amino groups on the surface of cage shaped octa(&#x3b3;-aminopropyl) silsesquioxanes, producing copolymers with cage shaped octa(&#x3b3;-aminopropyl) silsesquioxanes as nucleus and poly (L-glutamic-benzyl ester) as arms. The copolymers reacts with monomethoxy poly (ethylene glycol) carboxylic acid by condensation. Finally, the benzyl groups in the side chains of poly (L-glutamic acid-benzyl ester) are converted into hydrazine groups by acylhydrazination to obtain hybrid amphiphilic star copolymer nano micelles. The micelles can load doxorubicin, they are safe to human body and have good application prospects.

Method for preparation of hybrid amphiphilic star copolymer nano micelles

Disclosed is a preparation method for charge reversal and reversibly crosslinked redox-sensitive nanomicelles, falling within the technical field of biomedical materials. The method comprises: synthesizing thiocinamide from lipoic acid and ethylenediamine under an N,N'-carbonyl diimidazole catalyst; and polymerizing thiocinamide, polyethylene glycol diglycidyl ether and lysine through a nucleophilic addition mechanism to prepare a poly(lysine-co-polyethylene glycol diglycidyl ether-co-thiocinamide) terpolymer. The micelle is endowed with excellent anti-protein nonspecific adsorption and enhanced cell uptake property through a self-assembly and protonation/deprotonation action; and a disulfide bond in lipoyl may form a linear polydisulfide structure under the action of 1,4-dithiothreitol, so that a micelle core is crosslinked, and a crosslinked structure is destroyed in the cell under a redox condition, and controlled release of a drug can be achieved. The Nanomicelle of the present invention is expected to be a carrier of drugs for treating cancers.

Preparation method for charge reversal and reversibly crosslinked redox-sensitive nanomicelles

Provided are a reducible degradable hyperbranched-polymer nanomicelle and a method for preparation thereof and an application thereof. Cystamine and polyethylene glycol diglycidyl ether are polymerized by means of a nucleophilic addition mechanism; in one step, a hyperbranched polymer alternatingly arising from cystamine and polyethylene glycol structural units is synthesized and obtained; then, a hyperbranched nanomicelle is formed by means of self-assembly during the process of dialysis. The hyperbranched-polymer chain segments contain both tertiary aminos and disulfide bond structural units and have pH- and reduction responsiveness, and the hyperbranched three-dimensional cavity structure imparts a drug-carrying ability to the nanomicelle.

Method for preparation of reducible degradable hyperbranched polymeric micelles

A method for preparing a chitosan complex film comprises: (1) reacting polyvinyl alcohol-124 with butanedioic anhydride to obtain a modified polyvinyl alcohol; (2) formulating the modified polyvinyl alcohol-124 into a 0.4 wt % aqueous solution, then adding the aqueous solution containing 0.4 wt % of modified polyvinyl alcohol-124 dropwise into an acetic acid solution at a concentration of 0.4 wt % chitosan to obtain a mixed solution; (3) adjusting the pH value of the mixed solution with a 0.01 wt % NaOH solution to pH 5.5, and removing surface bubbles after standing for one hour to obtain a casting solution; (4) pouring the casting solution into a culture dish, placing the culture dish into an oven at 60&#xb0; C. and drying to a constant weight to obtain the chitosan complex film. The materials used in the method are inexpensive, and the reaction is not complicated, so the cost of the product is not high.

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Jiangsu, China

Caihua Ni