共查询到19条相似文献,搜索用时 93 毫秒
1.
采用溶液缩聚方法制备了含酪酸烷基酯的聚磷酸酯,研究了聚合物对氨甲蝶呤的体外释放性能和聚合物包裹氨甲蝶呤微胶囊的制备方法及其释药性能。 相似文献
2.
通过含酪氨酸的聚磷酸酯与药物分子进行大分子反应,制备了含5-氟尿嘧啶或氨甲蝶呤的聚磷酸酯。所得聚磷酸酯均具有两亲性,部分聚磷酸酯在水中能形成胶束。研究了这些聚合物的体外降解和释药性能,体外抗肿瘤实验表明,有些聚磷酸酯药物具有较强的抗肿瘤活性。 相似文献
3.
4.
超分子聚合物是超分子化学与高分子化学交叉的前沿研究领域,近年来受到了国内外研究学者的广泛关注.可控制备超分子聚合物对于研究超分子聚合物的结构与性能关系、设计合成特定功能的超分子聚合物具有重要的意义.本文将总结通过超分子单体的共价聚合反应以制备超分子聚合物的方法.不同于传统的制备超分子聚合物的方法,超分子单体的共价聚合方法将不易调控的非共价聚合转化为可控的共价聚合,为实现超分子聚合物的可控制备提供了新思路. 相似文献
5.
6.
7.
分子印迹技术是一种制备具有分子识别能力的聚合物的有效技术,已经广泛应用于制备对小分子具有选择性的分子印迹聚合物,但制备能够特异性识别生物大分子--蛋白质的分子印迹聚合物的研究仍然具有挑战性。本文讨论了制备蛋白质分子印迹聚合物的难点,评述了目前印迹蛋白质的方法及各自的优缺点,展望了蛋白质印迹技术的发展趋势。 相似文献
8.
聚合物孔材料的制备和应用研究已经成为聚合物科学和材料科学热点,制备聚合物孔材料的方法发展很快。本文综述了聚合物孔材料的制备方法,包括胶体晶模版法、水模版法、超临界二氧化碳发泡法、自组装法等。其中本课题组首次提出的无模版自组装法操作简单、无需模版、环境友好,具有广阔的发展前景。 相似文献
9.
10.
11.
Jankowski J Grosse-Hüttmann P Zidek W Schlüter H 《Rapid communications in mass spectrometry : RCM》2003,17(11):1189-1194
Dinucleoside polyphosphates are a group of intra- and extracellular mediators controlling numerous physiological functions. In this study dinucleoside polyphosphates were examined by positive ion matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MADLI-TOFMS). 3-Hydroxypicolinic acid was used as UV-absorbing matrix. For the individual dinucleoside polyphosphates Ap(n)A (n = 2-7), Ap(n)G (n = 2-6) and Gp(n)G (n = 2-6), MALDI post-source decay (PSD) mass spectra were measured. Each mass peak in the MALDI-PSD mass spectra could be assigned to individual fragments of dinucleoside polyphosphates. The comparison of the fragmentation patterns of the dinucleoside polyphosphates presented here demonstrates that dinucleoside polyphosphates preferably cleave to fragment ions consisting of the corresponding mononucleoside polyphosphates as well as the corresponding nucleosides and bases during flight in the field-free drift path of the MALDI mass spectrometer. Therefore, the MALDI-PSD approach described here is suitable for identification of other dinucleoside polyphosphates. The present MALDI-PSD mass spectra may be used as MALDI-PSD mass reference spectra for future identification of dinucleoside polyphosphates and other nucleotides. 相似文献
12.
采用溶液缩聚方法,制得含酪氨酸烷基酯的聚磷酸酯,再通过大分子反应分别得到主链带正、负电荷的聚磷酸酯,研究了这三类聚磷酸酯的体外降解行为,并对它们作为蛋白质的控制释放材料的性能进行了初步评价。 相似文献
13.
14.
Naoya Ogata Kohei Sanui Masashi Harada 《Journal of polymer science. Part A, Polymer chemistry》1979,17(8):2401-2411
Direct polycondensation of various nylon salts (salts of dicarboxylic acid and diamine) took place under mild conditions in the formation of polyamide in the presence of polyphosphates and organic bases. Among organic bases imidazole was the best in terms of polymer yields. The reactivity of the polyphosphates was arranged in following order: pyrophosphate ? tripolyphosphate > tetrapolyphosphate. Otimum reaction conditions were investigated in terms of solvents, temperatures, and concentration of monomers. A reaction mechanism was proposed for the phosphorylation reaction, due to polyphosphates, which led to the direct polycondensation of nylon salts. 相似文献
15.
SYNTHESISANDDRUGRELEASEOFCROSSLINKINGPOLYPHOSPHATESLuoYi;ZhuoRenxi;FanChanglie(DepartmentofChemistry,WuhanUniversity,Wuhan430... 相似文献
16.
Eight new polyphosphates containing both nucleic acid base and phosphonoacetic acid ethyl ester were synthesized by the polycondensation of P, P-dichloride of phosphonoacetic acid ethyl ester with 1, 3-dihydroxyalkyl-5-fluorouracil, 1,3-dihydroxyalkyl-uracil and 1,3-dihydroxyalkylthymine. These polyphosphates were tested against Ehrlich Ascites Carcinoma in mice. Polymer IIa and IIc exhibited excellent antitumor activity. IIc also showed lower toxicity. 相似文献
17.
A new class of crosslinking polyphosphates were synthesized and characterized by IR ^1HNMR,^31PNMR spectroscopy as well as elemental analysis.In vitro degradation of the polyphosphates obtained and the release of antineoplastic drug Methotrexate(MTX) and contraceptive Levonorgestrel(LNG) by using these polymers as matrix were studied.Zero order release rate was observed in the case of LNG release. 相似文献
18.
沸水阻断多聚磷酸盐分解离子色谱法检测水产品中的多聚磷酸盐 总被引:8,自引:0,他引:8
多聚磷酸盐在水产品中的快速分解影响其准确测定.用沸水破坏使多聚磷酸盐分解的物质,并用三氯甲烷去除水产品中蛋白质等杂质,离子色谱准确测定多聚磷酸盐各组分的量.实验中采用淋洗液自动发生器产生的KOH溶液作为流动相,保护柱和分离柱采用Ionpac AG11-HC和Ionpac AS11-HC抑制电导检测,可以较好地分离所检测焦磷酸根和三偏磷酸根.该方法操作简单,检出限为10 mg/kg,当水产品中添加多聚磷酸盐标准物质浓度达到10~1000 mg/kg范围时,回收率在70%~110%之间,相对标准偏差小于12% . 相似文献
19.
P Rotllán Pascual A Ramos Carrillo A Rodríguez del Castillo 《Journal of chromatography. A》1991,563(1):37-52
The reversed-phase high-performance liquid chromatographic separation of purine dinucleoside polyphosphates on octadecyl- and phenyl-bonded silica packings using phosphate-based eluents was studied. The effects of pH, ionic strength and the content of the organic modifiers methanol and acetonitrile in the mobile phase on the retention and other chromatographic parameters are reported. The data obtained were used to establish an isocratic assay for diguanosine and diadenosine polyphosphates. 相似文献