Controlled release NPK compound fertilizers were prepared by means of in situ polymerization of monomers on the surface of fertilizer granules at room temperature. Methacrylate, α-methyl acrylic acid, and ethylene di...Controlled release NPK compound fertilizers were prepared by means of in situ polymerization of monomers on the surface of fertilizer granules at room temperature. Methacrylate, α-methyl acrylic acid, and ethylene dimethylacrylate were used as monomers, Dibenzoyl peroxide as initiator, and cobalt naphthenate, and triethyl amine as promoters. The structures of coating materials were characterized by IR spectra. The thermogravimetric analysis result indicated that the coating materials were of good thermal stability. The mean thickness of single coating measured with screw gauge was ca. 140 μm. The morphologies of uncoated and coated fertilizer granules analyzed by using scanning electron microscopy were changed from porosities and gullies to hills and plain. The release rate of coated compound fertilizers in water could be controlled by the hydrophicity and thickness of coating. The increase in coating hydrophicity caused the increase in release rate of fertilizer. The increase in thickness of coating slowed the release rate.展开更多
Some disperse dyes were microencapsulated by means of in- situ polymerization. These microencapsulated disperse dyes was extracted respectively by ethanol under certain conditions. The controlled-release properties of...Some disperse dyes were microencapsulated by means of in- situ polymerization. These microencapsulated disperse dyes was extracted respectively by ethanol under certain conditions. The controlled-release properties of disperse dyes through the shell of microcapsules were measured by spectrophotometer. According to the results, it was drawn that the type of disperse dyes, the auxiliaries contained in disperse dyes, the quantity of system controlling medium used and the core/shell ratio of microcapsules play important roles in controlling the release properties of microcapsules. The different controlled- release properties of microcapsules, which were prepared under given conditions, however, would in turn influence the performance of microcapsules in multiple-transfer printing.展开更多
Biopharmaceuticals, including proteins, DNAs, and RNAs, hold vast promise for the treatment of many disorders, such as cancer, diabetes, autoimmune diseases, infectious diseases, and rare diseases. The application of ...Biopharmaceuticals, including proteins, DNAs, and RNAs, hold vast promise for the treatment of many disorders, such as cancer, diabetes, autoimmune diseases, infectious diseases, and rare diseases. The application of biopharmaceuticals, however, is limited by their poor stability, immunogenicity, suboptimal pharmacokinetic performance, undesired tissue distribution, and low penetration through biological barriers. In situ polymerization provides an appealing and promising platform to improve the pharmacological characteristics of biopharmaceuticals. Instead of the traditional ＂grafting to＂ polymer-biomolecule conjugation, in situ polymerization grows polymers on the surfaces of the biomacromolecules, resulting in easier purification procedures, high conjugation yields, and unique structures. Herein, this review surveys recent advances in the polymerization methodologies. Additionally, we further review improved therapeutic performance of the resultant nanomedicines. Finally, the opportunities, as well as the challenges, of these nanocomposites in the biomedical fields are discussed.展开更多
蛋白质-高分子偶联物是一类重要的长效化蛋白质,已被用于多种重大疾病的诊疗之中.探究新型、高效、温和的方法用以制备结构明确且功能可控的蛋白质-高分子偶联物是该领域所面对的重要科学问题.近年来,本课题组及同行将“蛋白质定点修饰...蛋白质-高分子偶联物是一类重要的长效化蛋白质,已被用于多种重大疾病的诊疗之中.探究新型、高效、温和的方法用以制备结构明确且功能可控的蛋白质-高分子偶联物是该领域所面对的重要科学问题.近年来,本课题组及同行将“蛋白质定点修饰”和“原位可控聚合”2种技术有机整合,提出了“蛋白质定点原位可控聚合”(site-specific in situ controlled polymerization,SICP)的方法,用以替代传统的聚乙二醇化技术,并在生物医学应用上取得了良好的进展.本专论主要从SICP方法的发展背景和内涵、蛋白质的定点修饰、原位可控聚合,以及SCIP在生物医学领域的应用等几个方面详细介绍SICP方法的研究进展,并对该方法未来的研发方向进行了简要的总结和展望.展开更多
基金Supported by Natural Science Foundation of China(30571086)
文摘Controlled release NPK compound fertilizers were prepared by means of in situ polymerization of monomers on the surface of fertilizer granules at room temperature. Methacrylate, α-methyl acrylic acid, and ethylene dimethylacrylate were used as monomers, Dibenzoyl peroxide as initiator, and cobalt naphthenate, and triethyl amine as promoters. The structures of coating materials were characterized by IR spectra. The thermogravimetric analysis result indicated that the coating materials were of good thermal stability. The mean thickness of single coating measured with screw gauge was ca. 140 μm. The morphologies of uncoated and coated fertilizer granules analyzed by using scanning electron microscopy were changed from porosities and gullies to hills and plain. The release rate of coated compound fertilizers in water could be controlled by the hydrophicity and thickness of coating. The increase in coating hydrophicity caused the increase in release rate of fertilizer. The increase in thickness of coating slowed the release rate.
文摘Some disperse dyes were microencapsulated by means of in- situ polymerization. These microencapsulated disperse dyes was extracted respectively by ethanol under certain conditions. The controlled-release properties of disperse dyes through the shell of microcapsules were measured by spectrophotometer. According to the results, it was drawn that the type of disperse dyes, the auxiliaries contained in disperse dyes, the quantity of system controlling medium used and the core/shell ratio of microcapsules play important roles in controlling the release properties of microcapsules. The different controlled- release properties of microcapsules, which were prepared under given conditions, however, would in turn influence the performance of microcapsules in multiple-transfer printing.
文摘Biopharmaceuticals, including proteins, DNAs, and RNAs, hold vast promise for the treatment of many disorders, such as cancer, diabetes, autoimmune diseases, infectious diseases, and rare diseases. The application of biopharmaceuticals, however, is limited by their poor stability, immunogenicity, suboptimal pharmacokinetic performance, undesired tissue distribution, and low penetration through biological barriers. In situ polymerization provides an appealing and promising platform to improve the pharmacological characteristics of biopharmaceuticals. Instead of the traditional ＂grafting to＂ polymer-biomolecule conjugation, in situ polymerization grows polymers on the surfaces of the biomacromolecules, resulting in easier purification procedures, high conjugation yields, and unique structures. Herein, this review surveys recent advances in the polymerization methodologies. Additionally, we further review improved therapeutic performance of the resultant nanomedicines. Finally, the opportunities, as well as the challenges, of these nanocomposites in the biomedical fields are discussed.
文摘蛋白质-高分子偶联物是一类重要的长效化蛋白质,已被用于多种重大疾病的诊疗之中.探究新型、高效、温和的方法用以制备结构明确且功能可控的蛋白质-高分子偶联物是该领域所面对的重要科学问题.近年来,本课题组及同行将“蛋白质定点修饰”和“原位可控聚合”2种技术有机整合,提出了“蛋白质定点原位可控聚合”(site-specific in situ controlled polymerization,SICP)的方法,用以替代传统的聚乙二醇化技术,并在生物医学应用上取得了良好的进展.本专论主要从SICP方法的发展背景和内涵、蛋白质的定点修饰、原位可控聚合,以及SCIP在生物医学领域的应用等几个方面详细介绍SICP方法的研究进展,并对该方法未来的研发方向进行了简要的总结和展望.
