CN113197854A - 一种氟康唑三元纳米胶束及其制备方法 - Google Patents
一种氟康唑三元纳米胶束及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种氟康唑三元纳米胶束的制备方法,属于药物制剂领域。它主要由以下质量比例组分组成:以氟康唑为1份,磷脂3~35份,胆酸盐2~22份,聚乙烯吡咯烷酮5~29份。该三元纳米胶束体系提高了水难溶性药物氟康唑的溶解度,增加了在体内的生物利用度。它能够加工制成多种剂型,且能够减少氟康唑的刺激性,制备方法简单且体系稳定,便于大规模工业化生产。
Description
技术领域
本发明涉及氟康唑药物制剂领域,具体是涉及一种氟康唑三元纳米胶束的制备方法。
背景技术
氟康唑由辉瑞(Pfizer)研发和生产,最早于1988年在法国上市销售,并于1989年3月31日获日本医药品医疗器械综合机构(PMDA)批准上市,上市剂型包括口服胶囊剂和注射剂,商品名为DIFLUCAN,其中注射剂规格50mg、100mg和200mg。1990年1月29日获美国食品药品监督管理局(FDA)批准上市销售,商品名为DIFLUCAN,剂型包括口服片剂、混悬剂和注射剂,商品名为DIFLUCAN,其中注射剂规格200mg/100mL和400mg/200mL有目前已经市场中断。
氟康唑化学名为:2-(2,4-二氟苯基)-1,3-双-(1H-1,2,4-三唑-1-基)-2-丙醇,分子式:C13H12F2N6O,本品为白色或类白色结晶或结晶性粉末;无臭或微带特异臭,在甲醇中易溶,在乙醇中溶解,在二氯甲烷、水或醋酸中微溶,在乙醚中不溶,结构式如下:
氟康唑是一种三唑类抗真菌药,于1988年由辉瑞公司(Pfizer)推出,用于口服治疗和预防艾滋病患者隐球菌性脑膜炎的复发。同年,被批准用于口服治疗各种各样的真菌感染,包括生殖器,粘膜,阴道和系统性念珠菌病,念珠菌性龟头炎,系统性隐球菌病,同时在接受细胞毒性化疗和/或放射治疗的骨髓移植患者中可降低念珠菌病的发病率。1989年,氟康唑被批准用于其他一些适应症:口咽和萎缩性口腔念珠菌病,足癣,体癣,股癣,花斑癣和真皮念珠菌感染。该药目前在全球各个国家均可用作胶囊,注射液和静脉输注液,悬浮剂和片剂。2011年11月,辉瑞公司在日本被批准使用该药物,用于预防成人和儿童进行造血干细胞移植的深部真菌病,以及治疗儿童患者的真菌病。2015年,该产品在日本被批准用于治疗外阴阴道念珠菌病。
氟康唑是一种三唑类抗真菌药,与其他咪唑和三唑类抗真菌剂一样,为真菌细胞色素P-450酶14α-脱甲基酶的高度选择性抑制剂。哺乳动物脱甲基酶活性对氟康唑的敏感性比真菌脱甲基酶低得多。抑制作用阻止了羊毛甾醇向真菌细胞壁的必需成分麦角固醇的转化,并导致14α-甲基甾醇的积累。这可能是氟康唑的抑制真菌作用的机制。该药物也以剂量依赖的方式对某些生物体具有杀真菌作用。
氟康唑在体内广泛分布于皮肤、水疱液、腹腔液、痰液等组织体液中。尿液及皮肤中药物浓度约为血药浓度的10倍;唾液、痰、水疱液、指甲中与血药浓度接近;脑膜炎症时,脑脊液中本品的浓度可达血药浓度的54~85%。少量在肝脏代谢。主要自肾排泄,以原形自尿中排出给药量的80%以上,静脉滴注和口服24h尿液药物排泄率分别为63.5%和57.1%;48h分别为77.8%和75.8%及72h为88.7%和85.3%72h。唾液药物浓度与血药浓度具有较好相关性,因此临床可以将唾液作为氟康唑常规治疗药物监测(TDM)样品。
吸收:氟康唑具有吸收好、排泄慢、组织分布广、生物利用度高等特点。健康志愿者口服或静脉注射氟康唑300mg后,测得平均药峰浓度(Cmax)约为6.5~8.5mg/L;达峰时间(Tmax)约l~2h;曲线下面积(AUC)约为220~280mg·(h·L)-1。;血浆消除半衰期(TI/2)约27~37h;血浆蛋白结合率约11~12%;吸收率常数Ka为1.53+0.84h-1。;消除速率常数(Ke)为0.02士0.04h-1,表观分布容积(Vd)为0.8L/kg,接近于体内水分总量。有研究表明不同剂型之间及不同给药途径之间各参数经统计学双单侧t检验无显著差异(p>0,05),具有生物等效性。
分布:氟康唑在体内广泛分布于皮肤、水疱液、腹腔液、痰液等组织体液中。表观体积分布接近全身水分。血浆蛋白结合率低(11-12%)。尿液及皮肤中药物浓度约为血药浓度的10倍;唾液、痰、水疱液、指甲中与血药浓度接近;脑膜炎症时,脑脊液中本品的浓度可达血药浓度的54~85%。
氟康唑能在皮肤的角质层、表皮、真皮和汗腺中达到高于血清的浓度。氟康唑积累在角质层中。每天一次50mg,氟康唑12天后的浓度为73μg/g,停止治疗7天后浓度仍为5.8μg/g。在150mg每周一次的剂量下,第7天氟康唑在角质层中的浓度为23.4μg/g,第二次剂量后7天仍为7.1μg/g。
每周一次给药150mg,4个月后健康指甲中氟康唑浓度为4.05μg/g,患病指甲中氟康唑浓度为1.8μg/g;在治疗结束后6个月,氟康唑在指甲中仍可监测到。
代谢:少量在肝脏代谢。
排泄:主要自肾排泄,以原形自尿中排出给药量的80%以上,静脉滴注和口服24h尿液药物排泄率分别为63.5%和57.1%;48h分别为77.8%和75.8%及72h为88.7%和85.3%72h。唾液药物浓度与血药浓度具有较好相关性,因此临床可以将唾液作为氟康唑常规治疗药物监测(TDM)样品。
纳米胶束利用胶束增溶作用可以提高难溶性药物的溶解度及口服生物利用度。依据构成载体材料相对分子质量的不同,纳米胶束可分为低分子胶束和聚合物胶束。胆盐/卵磷脂混合胶束主要由胆盐、卵磷脂、药物三部分组成,不仅可以显著提高难溶性药物的溶解度,还能提高药物的疗效,增加药物稳定性,是具有良好生物相容性的药物传递载体。但是由于低分子胶束采用小分子的表面活性基团作为载体材料,其增溶量、载药量及促进药物被机体利用的程度均有限,因而限制了其在难溶性药物增溶方面的广泛应用。聚合物胶束采用两亲性的大分子作载体材料,因两亲性聚合物遇水后亲油部分缠绕成内核,亲水部分则环绕在外构成外壳,这样的核壳结构不仅使高聚物可以很好地分散于水,同时由于分子量较大,可以为难溶性药物提供较大的疏水微环境,因而,与低分子胶束相比,聚合物胶束的载药量及稳定性明显提高。目前,已经报道的高聚物所用载体材料中,常用的有:环氧乙烷类高分子材料普朗尼克(pluronic)等,其特点是生物相容性和安全性好。研究证明,高分子材料聚乙烯吡咯烷酮(PVP)与低分子二元组合物胆盐/磷脂聚合胶束用物理的方法相组合,构建聚乙烯吡咯烷酮-磷脂-胆酸盐三元组合物,作为难溶性药物的载体,具有良好的增溶效果,另一方面,聚合物胶束由于具有较小的粒径(<200nm)和较大的分子量(>50kDa)而不被内皮网状系统吞噬或有效避免肾脏排泄,因此可以在血液中停留更长的时间。同时,由于胶束体系具有较好的组织透过性,尤其可在具有渗漏性血管的组织(如肿瘤或梗塞区域)聚集,即所谓的EPR效应,这使得胶束给药系统具有天然的被动靶向特性。近年来,在聚合物胶束表面进行结构修饰或连接其他靶向基团,用以增加胶束体系的载药量、稳定性和靶向效果的研究日益增多,越来越多的受体介导、物理化学靶向胶束给药体系用于抗肿瘤等疾病的治疗药物的开发。目前,尚未有以氟康唑作为原料药制备成三元纳米胶束制剂,以达到提高氟康唑溶解度和生物利用度的研究报道。
发明内容
本发明的目的在于提供一种氟康唑三元纳米胶束,将难溶于水的氟康唑制备成三元纳米胶束,以提高其溶解度,改善其体内生物利用度。
本发明的另一目的是提供这种氟康唑三元纳米胶束的制备方法。
为实现上述目的,本发明采用的技术方案如下:
一种氟康唑三元纳米胶束,主要由以下质量组分组成:氟康唑原料药1份,磷脂3~35份,胆酸盐2~22份,聚乙烯吡咯烷酮5~29份。
上述的一种氟康唑三元纳米胶束,所述的聚乙烯吡咯烷酮是聚乙烯吡咯烷酮-K30。
上述的一种氟康唑三元纳米胶束,所述的胆酸盐是胆酸钠。
上述的一种氟康唑三元纳米胶束的制法是:将氟康唑与磷脂、聚乙烯吡咯烷酮以及胆酸盐在无水乙醇中溶解后,旋转蒸发除去无水乙醇,得到氟康唑三元纳米胶束。
上述的复合物用不同的加工方法,可将其加工成不同的药物剂型,如液体制剂、冻干粉、软胶囊、复合物粉末、硬胶囊、片剂等多种药物剂型。不同的药物剂型的加工方法分别为:在复合物中加入注射用水或者缓冲液可制成胶束溶液液体制剂;在复合物中加入注射用水或缓冲液,冷冻干燥可制得冻干粉;将复合物真空干燥可制成复合物粉末;冻干粉或复合物粉末可与适宜辅料混合,进一步填入胶囊或制成片剂等药物制剂。
本发明具有以下的有益效果:
1、本发明增溶效果显著,并且使得该难溶性药物容易被人体吸收,血药浓度-时间曲线下的面积明显增加,提高了药物的生物利用度;
2、本发明对胃粘膜的刺激性明显降低;
3、本发明采用的配方和方法简单可行,无需特殊设备,便于大规模工业化生产。
附图说明:
图1为氟康唑三元纳米胶束与氟康唑原料药血药浓度曲线图(雄性)。
图2为氟康唑三元纳米胶束与氟康唑原料药血药浓度曲线图(雌性)。
表1为实施例1制备的氟康唑三元纳米胶束的稳定性实验数据表。
表2为实施例6制备的氟康唑三元纳米胶束的药物动力学参数(雄性)(n=6)。
表3为实施例6制备的氟康唑三元纳米胶束的药物动力学参数(雌性)(n=6)。
具体实施方式
应该指出,以下详细说明都是例示性的,旨在对本申请提供进一步的说明。除非另有指明,本文使用的所有技术和科学术语具有与本申请所属技术领域的普通技术人员通常理解的相同含义。以下所列实施例有助于本领域技术人员更好地理解本发明,但不以任何方式限制本发明。
为开发氟康唑纳米胶束制剂,本发明的设计思路为:将药物溶解在合适的有机溶剂中,加入胶束材料,旋蒸条件下除去有机试剂,在注射用水条件下,实现胶束的制备,实现了难溶性药物增溶的目的。
本发明的氟康唑纳米胶束由五步制备而成:
(1)氟康唑用无水乙醇溶解;
(2)圆底烧瓶中加入磷脂、聚乙烯吡咯烷酮-K30、胆酸钠,加入氟康唑乙醇溶液;
(3)超声至溶液澄清,旋转蒸发,除去无水乙醇;
(4)加入注射用水,复溶,振摇后澄清;
(5)冷冻干燥,得冻干粉。
实施例1氟康唑三元纳米胶束
氟康唑用40mL无水乙醇溶解,在圆底烧瓶中按照下表称取磷脂、聚乙烯吡咯烷酮-K30、胆酸钠,加入氟康唑溶液,超声至溶液澄清,旋转蒸发,除去无水乙醇,加入注射用水,振摇后澄清,得液体制剂,体系最终体积为10mL,药物浓度为5mg·mL-1,冷冻干燥,得冻干粉。
组分 | 质量/体积 |
氟康唑 | 0.05g |
磷脂 | 0.5g |
胆酸钠 | 0.2g |
聚乙烯吡咯烷酮-K30 | 0.2g |
注射用水 | 8mL |
实施例2氟康唑三元纳米胶束冻干制剂
氟康唑用40mL无水乙醇溶解,在圆底烧瓶中按照下表称取磷脂、聚乙烯吡咯烷酮-K30、胆酸钠,加入氟康唑溶液,超声至溶液澄清,旋转蒸发,除去无水乙醇,加入注射用水,振摇后澄清,得液体制剂,体系最终体积为10mL,药物浓度为5mg·mL-1,冷冻干燥,得冻干粉。
实施例3氟康唑三元纳米胶束
氟康唑用40mL无水乙醇溶解,在圆底烧瓶中按照下表称取磷脂、聚乙烯吡咯烷酮-K30、胆酸钠,加入氟康唑溶液,超声至溶液澄清,旋转蒸发,除去无水乙醇,加入注射用水,振摇后澄清,得液体制剂,体系最终体积为10mL,药物浓度为8mg·mL-1。
组分 | 质量/体积 |
氟康唑 | 0.08g |
磷脂 | 0.5g |
胆酸钠 | 0.08g |
聚乙烯吡咯烷酮-K30 | 0.2g |
注射用水 | 8mL |
实施例4氟康唑三元纳米胶束
氟康唑用40mL无水乙醇溶解,在圆底烧瓶中按照下表称取磷脂、聚乙烯吡咯烷酮-K30、胆酸钠,加入氟康唑溶液,超声至溶液澄清,旋转蒸发,除去无水乙醇,加入注射用水,振摇后澄清,得液体制剂,体系最终体积为8mL,药物浓度为2.5mg·mL-1。
组分 | 质量/体积 |
氟康唑 | 0.02g |
磷脂 | 0.5g |
胆酸钠 | 0.36g |
聚乙烯吡咯烷酮-K30 | 0.4g |
注射用水 | 6mL |
实施例5氟康唑三元纳米胶束
氟康唑用40mL无水乙醇溶解,在圆底烧瓶中按照下表称取磷脂、聚乙烯吡咯烷酮-K30、胆酸钠,加入氟康唑溶液,超声至溶液澄清,旋转蒸发,除去无水乙醇,加入注射用水,振摇后澄清,得液体制剂,体系最终体积为10mL,药物浓度为10mg·mL-1。
实施例6氟康唑三元纳米胶束
氟康唑用40mL无水乙醇溶解,在圆底烧瓶中按照下表称取磷脂、聚乙烯吡咯烷酮-K30、胆酸钠,加入氟康唑溶液,超声至溶液澄清,旋转蒸发,除去无水乙醇,加入注射用水,振摇后澄清,得液体制剂,体系最终体积为2mL,药物浓度为2.5mg·mL-1。
实施例7将实施例4所制备的三元纳米胶束进行载药量、包封率、粒径以及稳定性测定,进一步说明本发明的效果。
(1)载药量测定:取氟康唑三元纳米胶束适量,经0.22μm微孔滤膜过滤后,取0.1mL滤液以色谱纯甲醇定容至10mL,涡旋混匀后按照HPLC法测定氟康唑的载药量为2.43±0.18mg·mL-1。
(2)包封率测定:按公式计算包封率:EE%=C1/C2×100%。其中,EE%为包封率,C1为微孔滤膜过滤后三元纳米胶束中氟康唑含量,C2为处方中氟康唑的投药量。经计算得,氟康唑三元纳米胶束的包封率为(89.3±0.9)%。
(3)粒径测定取氟康唑三元纳米胶束,用注射用水适当稀释后,用激光粒度分析仪(马尔文3000型激光粒度仪)测定其粒径。经测定,氟康唑胶束的粒径为26.9±0.7nm。
(5)稳定性试验取氟康唑三元纳米胶束,分别于室温、40℃、60℃条件下放置30天,在实验的第0天、第7天、第14天、和第28天分别取样进行含药量、包封率和平均粒径的测定,结果见表1。由表看出,经三个温度下一个月的初步稳定性实验,氟康唑纳米胶束保持稳定,载药量和包封率略有下降但无明显变化,平均粒径稍有增加,但均小于50nm。
表1
实施例8氟康唑三元纳米胶束制剂的相对生物利用度实验
1.1动物给药与血样处理
24只健康SD大鼠,雌雄各半,四周龄,雄性体重200±10g,雌性体重180±10g,购自上海西普尔-必凯实验动物有限公司。大鼠在检疫期过后进行实验。将雌雄大鼠分别随机分为两组,每组6只,给药前禁食12小时,自由饮水。按120mg·kg-1的剂量分别口服灌胃氟康唑游离药物(10mg·mL-1的氟康唑原料药混悬于含6%SDS的水溶液(w/w)中,临用前配制)和氟康唑纳米胶束(实施例5),于给药后0.25(15分钟)、0.5、1、2、4、6、8、12、24h,从大鼠眼球后静脉采血约0.3mL,置于肝素抗凝管中,4000r·min-1离心10min后分离血浆,-20℃下冷冻存储直至分析。取血浆200μL置于10mL带塞离心管中,加400μL注射用水,加50μL内标溶液(10μg·mL-1α-萘酚甲醇溶液),之后加500μL乙腈,涡旋1min,再加环己烷和乙酸乙酯各1.5mL,涡旋3min并离心(3000rpm,10min),取上清液置于干净离心管中,于37℃水浴氮气吹干,残留物用100μL甲醇溶解并涡旋1min,3000rpm离心5min,吸取20μL上清液进HPLC测定。
1.2血浆药时曲线与相对生物利用度
绘制氟康唑三元纳米胶束与原料药的血浆药时曲线,见图1、2。拟合药动学参数,参数数据以Mean±SD表示,结果见表2、表3。
相对生物利用度F=AUCT×DR/(AUCR×DT)×100%,其中DT为氟康唑三元纳米胶束的口服给药剂量,DR为氟康唑的给药剂量。
从结果可以看出,氟康唑三元纳米胶束的t1/2、MRT和AUC显著高于原料药,说明氟康唑胶束口服给药后的药物体内滞留时间显著增加,生物利用度显著提高。
表2
表3
Claims (5)
1.一种氟康唑三元纳米胶束,其特征是:它是以氟康唑作为原料药,主要由以下质量组分组成:氟康唑原料药1份,磷脂3~35份,胆酸盐2~22份,聚乙烯吡咯烷酮5~29份。
2.根据权利要求1所述的一种氟康唑三元纳米胶束,其特征是:所述的聚乙烯吡咯烷酮是聚乙烯吡咯烷酮-K30。
3.根据权利要求1所述的一种氟康唑三元纳米胶束,其特征是:所述的胆酸盐是胆酸钠。
4.一种制备权利要求1所述的氟康唑三元纳米胶束的方法,其特征是操作步骤如下:
(1)氟康唑用无水乙醇溶解;
(2)圆底烧瓶中加入磷脂、聚乙烯吡咯烷酮-K30、胆酸钠,加入氟康唑乙醇溶液;
(3)超声至溶液澄清,旋转蒸发,除去无水乙醇;
(4)加入注射用水,复溶,振摇后澄清;
(5)冷冻干燥,得冻干粉。
5.一种制备权利要求4所述的制备方法,冻干的过程操作如下:(1)在搅拌下,将待干料液在-5℃~0℃的温度下进行预冷冻,使之变成具有初始孔隙的预冷冻物料;(2)将预冷冻物料在-20℃~-50℃的温度下进行冷冻,完成固化过程,得到具有初始孔隙的冷冻物料;(3)将冷冻物料进行冷冻干燥,得到最终产品。
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