WO2006050649A1 - Captopril a ciblage magnetique et liberation lente et procede pour le preparer - Google Patents

Captopril a ciblage magnetique et liberation lente et procede pour le preparer Download PDF

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WO2006050649A1
WO2006050649A1 PCT/CN2005/001463 CN2005001463W WO2006050649A1 WO 2006050649 A1 WO2006050649 A1 WO 2006050649A1 CN 2005001463 W CN2005001463 W CN 2005001463W WO 2006050649 A1 WO2006050649 A1 WO 2006050649A1
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captopril
magnetic
cpl
slow
ldhs
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Xue Duan
Hui Zhang
Hui Sun
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Beijing University of Chemical Technology
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Beijing University of Chemical Technology
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00Medicinal preparations characterised by special physical form
    • A61K9/48Preparations in capsules, e.g. of gelatin, of chocolate
    • A61K9/50Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
    • A61K9/5094Microcapsules containing magnetic carrier material, e.g. ferrite for drug targeting
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00Medicinal preparations containing organic active ingredients
    • A61K31/33Heterocyclic compounds
    • A61K31/395Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/40Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
    • A61K31/401Proline; Derivatives thereof, e.g. captopril
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00Drugs for disorders of the cardiovascular system
    • A61P9/04Inotropic agents, i.e. stimulants of cardiac contraction; Drugs for heart failure
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00Drugs for disorders of the cardiovascular system
    • A61P9/12Antihypertensives

Definitions

  • the invention relates to a magnetic targeted sustained release captopril and a preparation method thereof. Background technique
  • the targeted drug delivery system targeted drug del ivery sys tem
  • the administration system refers to that the drug is combined with the carrier or encapsulated by the carrier to directly locate the drug in the target region, or the drug is collected in the target region after administration, so that the target drug concentration is higher than that of the normal tissue administration system.
  • Targeted administration can reduce the dosage, improve the efficacy of the drug, reduce the side effects of the drug, and enhance the specificity of the drug to the target tissue.
  • the magnetic microsphere formulation is a fourth generation targeted drug delivery system.
  • the dosage form is characterized in that a drug and a suitable magnetic component (such as Fe 3 0 4 ) are formulated in a drug stabilization system, and under a sufficiently strong external magnetic field, the carrier is gradually directed to the target site to enable the drug to be contained therein.
  • Captopril is a first-generation angiotensin-converting enzyme (ACE) inhibitor that acts on the renin-angiotensin system to regulate the balance of blood pressure, electrolytes, and body fluids.
  • ACE angiotensin-converting enzyme
  • the role of improving heart function and renal function has been clinically recognized and affirmed, and has become a first-line drug for the treatment of hypertension and heart failure.
  • the clinical manifestation of the drug is the dissolution of common preparations. Faster, the body elimination half-life is shorter, and the peak-to-valley concentration difference is larger. Therefore, research on captopril targeted sustained release dosage forms has been one of the hotspots, but the research on magnetic targeting captopril sustained release agents is still blank.
  • the magnetic captopril sustained release dosage form of the invention Cpl-LDHs/MP (where MP is magnetic particles), the chemical formula of which is:
  • M 2+ is any one of Zn 2+ , Mg 2+ , Ni 2+ , Cu 2 ⁇ Fe 2 Co 2 Ca 2+ , Mn 2+ , preferably Zn 2+ or Mg 2+
  • 3+ is any one of Al 3+ , Fe 3+ , Cr 3+ , V 3 Co 3 Ga 3 Ti 3+ , and more preferably Al 3+ ;
  • Cpl Cpl 2 - represents the interlayer monovalent, divalent captopril anion
  • ⁇ ⁇ is an inorganic anion having a charge of ⁇ , ⁇ ⁇ — may be absent or any of CO —, N0 3 —, CI—, Br—, ⁇ , 0 ⁇ ⁇ 2 ⁇ 0 4 —
  • MP is any one of magnetic substances MgFe 2 0 4 , NiFe 2 0 4 , CoFe 2 0 4 , ZnFe 2 0 4 , MnFe 2 0 4 and Fe 3 0 4 , and MgFeA, NiFeA and Fe 3 0 4 are preferable.
  • the magnetic structure of the magnetic slow release agent is a shell-core type, that is, the magnetic nano-particles are coated with a layered material Cpl-LDHs having a specific saturation magnetization of 1. 0-6. 0 emu/g and a particle size distribution of 20- 200 nm.
  • the magnetic sustained release agent has a mass percentage of captopril of 10-50%, preferably 20-40%; the sustained-end period can reach 0. 4 h - 13 h, and the average can reach 0. 5 h - 4 h.
  • the specific preparation process of the magnetic captopril sustained release agent of the invention is as follows:
  • M 2+ is any one of Zn 2+ , Mg 2 ⁇ Ni 2 ⁇ Cu 2+ , Fe 2+ , Co 2+ , Ca 2+ , Mn 2+ , preferably Zn 2+ or Mg 2 + ;
  • M 3+ is any one of Al 3+ , Fe 3+ , Cr 3+ , V 3+ , Co 3+ , Ga 3+ , Ti 3+ , preferably Al 3+ ;
  • MM 3+ The preferred molar ratio is 1- 4:1;
  • Y, and ⁇ 2 represent any of the soluble ⁇ 2+ , ⁇ 3+ salt anions NO Cr, Br ⁇ ⁇ , H 2 P0 4 — , C0 3 2 — , Y, ⁇ 2 may be the same or different, preferably N0 3 —, Cl—, CO—;
  • MP is MgFe 2 0 4 , NiFe 2 0 4 , CoFe 2 0 4 , ZnFe 2 0 s MnFe
  • Step 3 Under N 2 protection, the reaction slurry in the crystallization tank is crystallized at 25-70 °C for 12-64 h, then filtered by suction, and washed with decarbonated deionized water until neutral, at 15-70. Dry at °C for 25-60 h to obtain Cpl-LDHs/MP 0
  • the obtained Cpl-LDHs/MP was characterized by X-ray powder diffraction and IR. The results showed that Cpl was intercalated between the layers and interacted with the laminate through hydrogen bonding and had the crystal structure of the hydrotalcite-like material.
  • the CPS was confirmed by XPS characterization.
  • the LDHs are connected to the MP phase in the form of lattice oxygen; the vibrating sample magnetometer shows that Cpl-LDHs/MP has significant magnetic properties.
  • Cpl-LDHs release experiment Take two 0.5 g of Cpl-LDHs/MP, placed in two Erlenmeyer flasks containing pH buffer solution (4.6 and 7.4), and then the conical flask The mixture was vortexed continuously in a water bath thermostat, and a small amount of suspension was taken at regular intervals. After the suspension was separated by centrifugation, the concentration of captopril was measured by spectrophotometry according to the Chinese Pharmacopoeia. It can be seen from Fig. 3 that the sustained release effect of Cpl-LDHs/MP is significantly affected by pH and has a certain sustained release capacity in different pH environments.
  • the invention has the advantages that: the drug is magnetically supported, and the drug can be targeted to the lesion site under the guidance of external magnetic properties, the dosage is reduced, the drug efficacy is improved, the toxic side effect of the drug is reduced, and the specificity of the drug to the target tissue is enhanced. Since the hydrotalcite-like layered material can ion exchange with the phosphate anion in the intestine, and then the layer Cpl is released and released to achieve controlled release, it can be used as a sustained release matrix material. BRIEF DESCRIPTION OF THE DRAWINGS
  • Figure 1 is an X-ray powder diffraction pattern of Cpl-LDHs/MP under the conditions of Example 1.
  • 2 is an IR spectrum of Cp LDHs/MP under the conditions of Example 1.
  • Figure 3 is a graph showing the release profile of captopril of Cpl-LDHs/MP in sulphate buffer solution (pH 4.6 and pH 7.4) under the conditions of Example 1.
  • FIG. 4 is an electron micrograph of Cpl-LDHs/MP under the conditions of Example 1. DETAILED DESCRIPTION OF THE INVENTION Example 1
  • the obtained slurry was crystallized at 25 °C for 48 h, filtered, washed, and vacuum dried at room temperature for 60 h to obtain a magnetic captopril sustained-release agent.
  • the water used in the process is decarbonated deionized water.
  • Figure 1 shows the results of powder diffraction of Cpl-LDHs/MgFe 2 0 ⁇ X-rays with the crystal structure of hydrotalcite-like materials.
  • Figure 2 shows the results of Cpl-LDHs /MgFe 2 0 ⁇ IR characterization. It is confirmed that Cpl has been inserted into the interlayer and interacted with the laminate through hydrogen bonding, and the characteristic absorption peak of MgFe 2 0 4 can be observed.
  • Figure 3 is a graph showing the release profile of captopril in a phosphate buffer solution (pH 4.6 and pH 7.4) of Cpl-LDHs / MgFe 2 0 4 .
  • the MgFe 2 0 4 in the first step of the embodiment 1 was replaced with the same mass of NiFeA, and the other parts were the same as in the first embodiment.
  • Example 3 The obtained sample was analyzed in the same manner as in Example 1, and its empirical formula was: [Mgo. 63 2 Alo.36 8 (OH) 2 ] (C 9 H, with S 2 -) 0. 0736 (C0 3 0. ⁇ 4 ⁇ 0. 6H 2 0 / (NiFe 2 0 4) oo] 52, mass captopril content of 20.40%, the saturation magnetization of 1. 30 emu / g Example 3
  • Example 1 The MgFe 2 0 4 in the first step of Example 1 was replaced with the same quality of Fe 3 0 4 , and the other parts were the same as in Example 1.
  • the slurry was crystallized at 25 °C for 48 h, filtered, washed, and vacuum dried at room temperature for 60 h to obtain a magnetic captopril extended release agent.
  • the water used in the process is decarbonated deionized water.
  • Example 4 The MgFe 2 0 4 in the first step of Example 4 was replaced with NiFeA of the same quality, and the other parts were the same as in Example 4.
  • Example 6 The obtained sample was analyzed in the same manner as in Example 1, and its empirical chemical formula was: [ ⁇ . ⁇ 6 ⁇ 1 , 39 ⁇ ) 2 ] (C 9 H, 3 N0 3 S 2 - ).
  • Example 6
  • Example 4 The MgFeA in the first step of Example 4 was replaced with the same quality of Fe 3 0 4 , and the other parts were the same as in Example 4.

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Description

一种磁性靶向緩释型卡托普利及其制备方法 技术领域
本发明涉及一种磁性靶向緩释型卡托普利及其制备方法。 背景技术
在临床治疗疾病的过程中往往需要提高药物的靶向性, 以期最大限度 地增强药物的疗效, 同时使药物的不良反应降至最低, 因此靶向给药系统 (targeted drug del ivery sys tem)已成为现代药剂学的重要内容。 ί巴向给 药体系指药物与载体结合或被载体包裹能将药物直接定位于靶区, 或给药 后药物集结于靶区, 使靶区药物浓度高于正常组织的给药体系。 靶向给药 可减少用药剂量, 提高药物疗效, 条低药物的毒副作用, 增强药物对靶组 织的特异性。 靶向给药常见的类型有: ①被动靶向制剂, 如脂质体、 毫微 嚢等; ②主动靶向制剂, 如前体药物靶向制剂、 含单克隆抗体的药物载体; ③物理化学耙向制剂, 如磁性制剂、 ρΗ敏感的靶向制剂、 栓塞靶向制剂、 热敏靶向制剂。 在各种靶向制剂中, 磁性微球制剂属第四代靶向给药系统。 该剂型的特点是把药物和适当的磁性成分(如 Fe304 ) 配制在药物稳定系统 中, 在足够强的外磁场作用下, 渐渐地把载体定向于靶位、 使其所含药物 得以定位释放, 集中在病变部位发挥作用从而达到高效、 速效、 低毒的新 型制剂。 由于其所包裹的纳米磁粉具有超顺磁性, 它可通过外磁场的作用 进行快速富集, 而当外磁场撤消后, 又可完成消磁, 被重新分散, 从而避 免了因刚性微球聚集后阻塞啟血管而导致的严重后果。
卡托普利 (Cpl )是第一代血管紧张素转换酶(ACE )抑制剂, 它作用 于肾素 -血管紧张素系统, 从而调节血压、 电解质及体液的平衡, 近年来在 治疗高血压、 改善心功能和肾功能方面的作用曰益被临床认识和肯定, 已 成为治疗高血压及心力衰竭的一线药物。 该药物的临床表现为普通制剂溶 出快, 体内消除半衰期短, 且峰谷浓度差值较大。 因此关于卡托普利靶向 緩释剂型的研究一直是热点之一, 然而关于磁靶向卡托普利緩释剂的研究 尚属空白。
文献 (YoicM Ikeda, Kenya Kimura, Fumi toshi Hi rayama, Hidetoshi Ar ima, Kane to Uekama, Journal of Control led Release 66 (2000) 271 - 280)以 2 - hyroxypropyl- β -cyclodextr in ( β -CyD) hydrophob ic perbutanoyl- (3 -cyclodextr in (TB- β - CyD) 作为基质材料制备卡托普利 緩释剂, 但所得的緩释剂中卡托普利的释放速度较快。
^ CAbubakr 0. Nur, Jim S. Zhang, Int. J. Pharm. 194 (2000) 139-146) 对卡托普利控制释放的进展进行了综合论述, 文中并未提及借助 外加磁性物质来提高药物治疗效果; 同时以酸溶性的无机材料水滑石为载 体制备卡托普利緩释剂也未见说明。 发明内容
本发明的一个目的是制备一种具有磁性靶向效果的緩释型卡托普利。 本发明的另一个目的是提供一种磁性靶向緩释型卡托普利的制备方法。
本发明的磁性卡托普利緩释剂型 Cpl- LDHs/MP (其中 MP为磁性颗粒) , 其化学式为:
(M2+) ,-x (M3+) x (OH) 2 (CpD a (Cpl2") b (Bn— ) c · mH20/ (MP) y
其中 M2+是 Zn2+、 Mg2+、 Ni2+、 Cu2\ Fe2 Co2 Ca2+、 Mn2+中的任何一种, 较优的是 Zn2+或 Mg2+; M3+是 Al3+、 Fe3+、 Cr3+、 V3 Co3 Ga3 Ti3+中的任何 一种, 较优的是 Al3+;
Cpl Cpl2—分别代表层间一价、 二价卡托普利阴离子;
Βπ一为荷电量为 η的无机阴离子, Βη—可以不存在或为 CO —、 N03—、 CI—、 Br―、 Γ、 0Ε Η2Ρ04—中的任何一种;
0. 1<χ<0. 8; a、 b、 c分别为 Cpl—、 Cpl2—、 Bn—的数量, JL a+2 x b+ n c = x; m为结晶水数量, 0. 0Km<4; y为 MP的数量, 0. 001<y<l;
MP为磁性物质 MgFe204、 NiFe204、 CoFe204、 ZnFe204、 MnFe204及 Fe304中 的任何一种, 优选 MgFeA、 NiFeA及 Fe304
该磁性緩释剂的化学结构为壳核型, 即在磁性纳米颗粒外包覆层状材 料 Cpl- LDHs , 其比饱和磁化强度为 1. 0-6. 0 emu/g ,粒度分布在 20-200 nm。
该磁性緩释剂中卡托普利质量百分含量为 10-50%, 较佳的为 20-40%; 緩锋持效期可达到 0. 4 h - 13 h, —般的可达到 0. 5 h - 4 h。
本发明磁性卡托普利緩释剂具体制备过程如下:
步骤 1 : 将可溶性二价金属盐 M2^和可溶性三价金属盐 M2+/M3+ = 1-8: 1 的摩尔比用脱二氧化碳去离子水配成混合盐溶液 A, 其中 [ M2+ ] 为 0. 01-1 mol /1; 另将 NaOH与卡托普利原药按 2-9: 1的摩尔比用脱二氧化 碳去离子水配成碱溶液 B, 其中卡托普利与 M2+的摩尔数之比为 1-4: 1 ; 再 将磁性物盾 MP按 M2+/MP=1- 10: 1的质量比投入到溶液 B中, 剧烈搅拌使其 均匀分散;
其中 M2+是 Zn2+、 Mg2\ Ni2\ Cu2+、 Fe2+、 Co2+、 Ca2+、 Mn2+中的任何一种, 较优的是 Zn2+或 Mg2+; M3+是 Al3+、 Fe3+、 Cr3+、 V3+、 Co3+、 Ga3+、 Ti3+中的任何 一种, 较优的是 Al 3+; M M3+较优摩尔比为 1- 4: 1 ; Y,、 Υ2代表可溶性 Μ2+、 Μ3+盐的阴离子 NO Cr、 Br―、 Γ、 H2P04— 、 C03 2—中的任意一种, Y,、 Υ2可以 相同也可以不同,较佳的为 N03—、 Cl—、 CO —; MP为 MgFe204、 NiFe204、 CoFe204、 ZnFe20„s MnFe204及 Fe304中的任何一种, 优选 MgFeaC MFe204及 Fe304; 步骤 2:将溶液 B置于带搅拌的反应容器中,在滴定速率为 0. 001-1 ml /s 条件下将混合盐溶液 A緩慢加入, 至反应体系的 pH为 6-10左右停止, 转 入晶化釜中;
步驟 3: 在 N2保护下, 使晶化釜内反应浆液在 25-70 °C温度下晶化 12-64 h, 再经抽滤、 用脱二氧化碳去离子水洗至中性, 在 15-70 °C干燥 25-60 h, 得到 Cpl-LDHs/MP0 将得到的 Cpl- LDHs/MP进行 X射线粉末衍射和 IR表征, 结果显示 Cpl 已插入层间, 并通过氢键与层板发生作用并具有水滑石类材料的晶体结构; 通过 XPS表征证实 Cp卜 LDHs同 MP两相之间以晶格氧形式连接; 振动样品 磁强计显示出 Cpl-LDHs/MP具有明显的磁性。
靶向性能表征: 将产物 Cpl-LDHs/MP 均匀分散到乙醇溶液中, 取一滴 悬浊液置于玻璃片上, 在液滴的一侧放置磁铁, 立即可以在显微镜下观察 到固体不溶颗粒迅速地向磁铁方向移动, 并在靠近磁铁的一侧聚集。 几分 钟后, 几乎全部固体颗粒都聚集在磁铁的一侧, 说明固体颗粒具有良好的 磁性。 若将含固体颗粒的液滴与磁铁的距离加大, 由于固体颗粒所受的磁 力减小, 运动速度明显減慢, 但仍可见固体颗粒沿磁力线方向呈串珠状排 列。 这是由于在磁场的作用下, 固体颗粒自身被磁化而成为小磁铁, 因相 互吸引前后连接而形成串珠状聚集。
Cpl- LDHs释放实验: 取两份 0. 5g的 Cpl- LDHs/MP, 分别置于两个盛有 pH緩冲溶液(4. 6和 7. 4)的锥形瓶中,然后将锥形瓶放入水浴恒温振荡器中 连续振荡, 按一定时间间隔取少量悬浮液, 所取悬浮液经离心分离后, 根 据中国药典, 用分光光度法测量其中卡托普利的浓度。 由图 3 看出 Cpl-LDHs/MP的緩释效果受 pH影响显著,且在不同 pH值环境中均具有一定 的緩释能力。
本发明的优点是: 使药物承载磁性, 在外磁性的引导下可靶向药物至 病灶部位, 减少用药剂量, 提高药物疗效, 降低药物的毒副作用, 增强药 物对靶组织的特异性。 由于水滑石类层状材料能同肠道内磷酸根阴离子发 生离子交换作用, 进而舞放出层间 Cpl 达到控制释放的效果, 因此可作为 緩释骨架材料。 附图说明'
图 1为实施例 1条件下 Cpl- LDHs/MP的 X射线粉末衍射图。 图 2为实施例 1条件下 Cp LDHs/MP的 IR谱图。
图 3为实施例 1条件下 Cpl- LDHs/MP在鱗酸根緩冲溶液( pH 4. 6和 pH 7. 4 ) 中卡托普利的释放曲线。
图 4为实施例 1条件下 Cpl-LDHs/MP的电镜照片。 具体实施方式 实施例 1
1. 将 3. 0795 g的 Mg (N03) 2 · 6H20和 2. 2507g的 Al (N03) 3 · 9H20用 50 ml 水配成 Mg/Al摩尔比等于 2的混合盐溶液 A; 另将 1. 5 g的 aOH与 2. 6097 g 的卡托普利原药用 150 ml水配成混合碱溶液 B, 再将 0. 0576 g的 MgFe204 投入到其中;
2. 在 N2保护下将混合盐溶液 A緩慢滴入到剧烈搅拌的混合碱溶液 B 中, 当 pH值为 10左右时停止加入;
3. 所得浆液于 25 °C晶化 48 h, 抽滤、 洗涤, 室温真空干燥 60 h, 得 到磁性卡托普利緩释剂。 过程中所用水均为脱二氧化碳去离子水。
图 1为 Cpl- LDHs/MgFe20^ X射线粉末衍射表征结果,具有水滑石类材 料的晶体结构。
图 2为 Cpl- LDHs /MgFe20^々 IR表征结果, 证实 Cpl 已插入层间, 并通 过氢键与层板发生作用, 并能观察到 MgFe204的特征吸收峰。
图 3为 Cpl- LDHs /MgFe204在磷酸根緩冲溶液( pH4. 6和 pH7. 4 ) 中卡托 普利的释放曲线。
采用 TG/DTA、 ICP及元素分析方法对产品进行分析、 表征, 确定其经 验化学式为:
[Mg。.636Al。.3M (0H) 2] (C9H13N03S2— ) 。 (C03 2— ) 。. · 0. 7H20/ (MgFe204) 。.嶋, 卡 托普利质量含量为 19. 65%, 比饱和磁化强度为 1. 04 emu/g。 实施例 2
将实施例 1步骤 1中 MgFe204用相同质量的 NiFeA替代,其它部分同实 施例 1
将得到的样品采用与实施例 1相同的方法进行分析, 其经验化学式为: [Mgo.632Alo.368 (OH) 2] (C9H,具 S2-) 0. 0736 (C03 0. πο4 · 0. 6H20/ (NiFe204) o.o]52, 卡托普 利质量含量为 20. 40%, 比饱和磁化强度为 1. 30 emu/g 实施例 3
将实施例 1步骤 1中 MgFe204用相同质量的 Fe304替代,其它部分同实施 例 1
将得到的样品采用与实施例 1相同的方法进行分析, 其经验化学式为:
[Mg .642Al .358 (0H) 2] (C9H,3NO3S2-) 0.O667 (CO3 2一 ) 0.„23 · 0. 8H20/ (Fe304) 0 卡托普利 质量含量为 21. 72%, 比饱和磁化强度为 3. 64 e隱 /g 实施例 4
1. 将 4. 2241 g的 Ζη (Ν03) 2 · 6Η20和 1. 3317 g的 Al (Ν03) 3 · 9Η20用 60 ml 水配成 Zn/Al摩尔比等于 4 的混合盐溶液 A; 另将 1. 988 g 的 NaOH和
3. 0854 g的卡托普利原药用 100 ml水配成混合碱溶液 B, 再将 0. 093 g的 MgFe204投入到其中;
2. 在 N2保护下将混合盐溶液 A緩慢滴入到剧烈搅拌的混合碱溶液 B 中, 当反应体系的 pH值为 9左右时停止加入;
3. 浆液于 25 °C晶化 48 h, 抽滤、 洗涤, 室温真空干燥 60 h, 得到磁 性卡托普利緩释剂。
过程中所用水均为脱二氧化碳去离子水。
将得到的样品采用与实施例 1相同的方法进行分析, 得到其经验化学 式为:
[Zn0.608Alo. 392 (OH) 2] (C9H13N03S2— ) , 196 · 0. 9H20/ (MgFe20,)„.„165, 卡托普利质量 含量为 28. 61%, 比饱和磁化强度为 1. 23 emu/g 实施例 5
将实施例 4步驟 1中 MgFe204用相同质量的 NiFeA替代,其它部分同实 施例 4
将得到的样品采用与实施例 1相同的方法进行分析, 其经验化学式为: [Ζη .ό 6Α1 , 39 ΟΗ) 2] (C9H,3N03S2— )。. ,„■ 0. 7H20/ (NiFeA)。,。174, 卡托普利质量 含量为 28. 60%, 比饱和磁化强度为 1. 42 emu/g 实施例 6
将实施例 4步骤 1中 MgFeA用相同质量的 Fe304替代,其它部分同实施 例 4
将得到的样品采用与实施例 1相同的方法进行分析, 其经验化学式为: [Zn„.618Al, 382 (OH) 2] (C9H13N03S2-)„.196 · 0. 9H20/ (Fe304) 其中的卡托普利质量 含量为 30. 23%, 比饱和磁化强度为 4. 68 emu/g

Claims

权利要求书
1. 一种磁性靶向緩释型卡托普利, 其化学式为:
(M2+) ^ (M3+) x (OH) 2 (CpD a (Cpl2-) b (B-)。 · mH20/ (MP) y
其中 M2+是二价金属离子 Zn2+、 Mg2+、 Ni2+、 Cu2+、 Fe2+、 Co2+、 Ca2+、 Mn2+中 的任何一种; M3+是三价金属离子 Α 、 Fe3+、 Cr3+、 . V3+、 Co3+、 Ga3+、 Ti3+中的 任何一种;
Cpl—、 Cpl 2-分别代表层间一价、 二价卡托普利阴离子;
Bn—为荷电量为 n的无机阴离子, Bn—可以不存在或为 C03 2—、 N03一、 C1一、 Br -、 Γ、 OH -、 H2P0 中的任何一种;
0. Kx<0. 8; a、 b、 c分别为 Cpl—、 Cpl2—、 Bn—的数量, 且 a+2 χ b+ n χ c
= x; m为结晶水数量, 0. 01<m<4;
MP代表磁性物质 MgFe204、 NiFe204、 CoFe204、 ZnFe204、 MnFe204或 Fe304 中的任何一种; y为 MP的数量, 0. 001<y<l ;
该磁性緩舞剂的比饱和磁化强度为 1. 0- 6. Q emu/g , 粒度分布在 20-200 腿, 磁性緩释剂中卡托普利质量百分含量为 10-50°/o。
2. 才艮据权利要求 1 所述的磁性靶向緩释型卡托普利, 其特征在于 M2+ 是 Zn2+或 Mg2+, M3+是 Al3+; MP是 MgFe204、 NiFe204或 Fe304;
磁性緩释剂中卡托普利质量百分含量为 20-40%。
3. 一种磁性靶向緩幹型卡托普利的制备方法, 制备步骤如下: 步骤 1: 将可溶性二价金属盐 M2+Y,和可溶性三价金属盐 M3¾^ M2+/M3+
= 1-8: 1 的摩尔比用脱二氧化碳去离子水配成混合盐溶液 A, 其中 [ M2+ ] 为 0. 01-1 mol / 1 ; 另将 NaOH与卡托普利原药按 2 - 9: 1的摩尔比用脱二氧化 碳去离子水配成碱溶液 B, 其中卡托普利与 M2+的摩尔数之比为卜 4: 1; 再 将磁性物质 MP按 M27MP=1- 10: 1的质量比投入到溶液 B中, 剧烈搅拌使其 均匀分散;
步骤 2 : 将上述碱溶液 B 置于带搅拌的反应容器中, 在滴定速率为 0. 001-1 ml /s条件下将混合盐溶液 A緩慢加入, 至反应体系的 pH为 6-10 时停止, 转入晶化釜中;
步骤 3: 在 N2保护下的, 使晶化釜内反应浆液在 25 - 70 °C温度下晶化
12-64 h, 再经抽滤、 用脱二氧化碳去离子水洗至中性, 在 15-70 °C干燥 25-60 h, 得到 Cpl-LDHs/MP;
步骤 1中 M2+代表二价金属离子 Zn2+、 Mg2+、 Ni2+、 Cu2+、 Fe2+、 Co2+、 Ca2+、 Mn2+中的任何一种; M3+代表三价金属离子 Al3+、 Fe3\ Cr3+、 V3+、 Co3+、 Ga3+、 Ti3+中的任何一种; Υ2代表可溶性 Μ2+、 Μ3+盐的阴离子 ΝΟΛ CI—、 Br―、 Γ、 H2P04- 、 CO —中的任意一种, Y,、 Υ2可以相同也可以不同; MP代表磁性物质 MgFe204、 NiFe204、 CoFe204、 ZnFe204、 MnFe204或 Fe304中的任何一种。
4. 根据权利要求 3所述的磁性靶向緩释型卡托普利的制备方法, 其特 征在于步骤 1中 M2+是 Zn2+或 Mg2+, M3+是 Al3+, Y,、 Υ2为 N0 、 CI—或 C03 2— ; MP 是 MgFe204、 NiFe204或 Fe304; [M2+] / [M3+]摩尔比为 1- 4: 1;
步骤 2中至反应体系的 pH为 8-10时停止反应。
PCT/CN2005/001463 2004-11-15 2005-09-12 Captopril a ciblage magnetique et liberation lente et procede pour le preparer Ceased WO2006050649A1 (fr)

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