海藻酸包衣的季铵化壳聚糖纳米粒用于胰岛素口服给药的研究

本研究的目的是开发海藻酸包衣的壳聚糖纳米粒口服递送胰岛素。采用三聚磷酸钠（TPP）离子交联作用将N-[（2-羟基-3-三甲基铵）丙基]壳聚糖氯化物（HTCC）制备得到季铵化壳聚糖纳米粒（HTCC-T纳米粒）,然后在温和搅拌条件下滴加入海藻酸钠溶液,进一步形成海藻酸包衣季铵化壳聚糖纳米粒（HTCC-A纳米粒）。分别采用粒度仪、透射电镜和HPLC分析对HTCC-A纳米粒进行了粒径、zeta电位、表面形态、载药量和包封率的表征。结果表明,HTCC-A纳米粒为均匀的球形颗粒,大小为（322.2±8.5）nm,表面带有正电荷（（14.1±0.6）mV）。体外释放结果表明,在不同p H值的释放介质中,HTCC-A纳米粒的释放行为与HTCC-T纳米粒（未用海藻酸包衣）有很大的不同,这表明海藻酸包衣可以显著改善纳米粒中胰岛素的释放行为。同时,体外酶解试验和圆二色散图谱进一步证实,海藻酸包衣可以显著改善纳米粒中胰岛素结构稳定性。HTCC-A纳米粒十二指肠给药的相对药理生物利用度为8.0%±2.5%。与HTCC-T纳米粒口服给药相比,HTCC-A纳米粒的相对药理生物利用度显著增加（P〈0.05）,是HTCC-T纳米粒的2.2倍。由此可见,海藻酸包衣季铵化壳聚糖纳米粒（HTCC-A纳米粒）将可能成为一种有效的口服递送载体系统用于提高胰岛素的体内口服吸收效果。     

口服藻酸双酯钠纳米粒的制备、体外释药特性及其药效学研究

目的为了提高藻酸双酯钠(PSS)口服制剂的稳定性及其生物利用度,制备藻酸双酯钠的口服纳米粒(PSS-NP),并对其理化性质、体外释药特性及其药效学进行考察。方法采用改进的双乳化溶剂蒸发法(W1/O/W2)制备藻酸双酯钠纳米粒并设计正交试验筛选最优处方;透射电镜观察纳米粒形态;粒度及表面电位分析仪测量纳米粒的粒径及zeta电位;氧瓶燃烧法测定载药纳米粒的包封率与载药量;超速离心法考察载药纳米粒的体外释药特性;正常小鼠灌胃给药测定降血糖效果。结果与结论优化的口服藻酸双酯钠纳米粒为规则的圆球形,其粒径大小为181.8 nm,包封率为75.80%,载药量为10.83%,zeta电位为-17.3 mV;12 h内PSS-NP累积释药百分率为60.37%;PSS-NP对正常小鼠具有显著的降血糖效果。     

姜黄素液晶纳米粒大鼠口服吸收的研究

目的:研究姜黄素液晶纳米粒大鼠的口服吸收。方法:采用热处理-高压匀质法制备姜黄素液晶纳米粒,利用HPLC测定血浆中姜黄素浓度,DAS 2.0软件处理数据,求算药动学参数。结果:姜黄素液晶纳米粒口服吸收符合单室模型;与原料药组相比,姜黄素液晶纳米粒口服相对生物利用度为395.56%。结论:液晶纳米粒显著提高了姜黄素的口服吸收。     

紫杉醇PLGA纳米粒大鼠生物利用度的测定

目的制备紫杉醇PLGA纳米粒,以紫杉醇注射液为参比制剂,进行生物利用度考察。方法以乳化-溶剂挥发法制备紫杉醇纳米粒,用HPLC法测定全血中的药物浓度,计算紫杉醇纳米粒的生物利用度。结果紫杉醇纳米粒外观圆整,平均粒径为99.0nm,Zeta电位58.3mV,平均包封率为56.77%,载药量为7.10%。大鼠口服给药后,紫杉醇纳米粒的绝对生物利用度达到19.5%。结论纳米载药系统的制备有利于促进紫杉醇的吸收,提高了其口服生物利用度。     

重组水蛭素-2鼻腔黏附纳米粒的体外评价

目的:对制备的重组水蛭素-2(rHV2)壳聚糖鼻腔黏附纳米粒进行体外评价。方法:测定纳米粒的形态、粒径大小分布及表面电位;以超速离心测定纳米粒在不同介质中的释放度;采用在体蟾蜍上腭纤毛运动试验法考察纳米粒的纤毛毒性。结果:制备的rHV2壳聚糖纳米粒呈较为均匀分散的颗粒状,平均粒径为213.2 nm,纳米粒带正电荷,Zeta电位值为+30.61 mV,体系相对稳定性较高;rHV2纳米粒在乙酸缓冲液中的累积释放百分数明显高于在磷酸缓冲液中的累积释放百分数;rHV2纳米粒溶液的纤毛毒性较小(与生理盐水组相比,P>0.05)。结论:壳聚糖鼻腔黏附纳米粒有望成为rHV2鼻腔给药的递释系统。     

单油酸甘油酯/TPGS/壳聚糖脂质纳米粒提高姜黄素稳定性的研究

目的制备载有姜黄素的单油酸甘油酯(GMO)/聚乙二醇1000维生素E琥珀酸酯(TPGS)/壳聚糖(CS)脂质纳米粒,考察该脂质纳米粒在提高药物稳定性方面的潜能。方法采用乳化-高压均质法制备载有姜黄素的GMO/TPGS/CS脂质纳米粒,对该纳米粒进行粒径及分布、zeta电位、微观形态、物理稳定性、UV-Vis光谱学及体外释放动力学等表征。并以姜黄素水溶液为对照,测定该脂质纳米粒在高温、光照、强碱等条件下的稳定性。结果该纳米粒为球形或类球形,平均粒径为(93.8±2.80)nm,多分散系数为(0.156±0.063),zeta电位为+(16.76±1.52)mV;有良好的物理稳定性;UV-Vis光谱显示,姜黄素可能通过疏水作用结合在纳米粒上,这使得药物产生缓释效果,符合Weibull方程。相比姜黄素水溶液,在高温、光照及强碱等强条件下,包封在纳米粒中的姜黄素降解程度显著减小。结论本试验证明了结合使用GMO/TPGS/CS制备姜黄素脂质纳米粒,可显著提高姜黄素的稳定性。     

双烟酸姜黄素酯纳米粒与双烟酸姜黄素酯体内转运动力学特性研究

目的 提高双烟酸姜黄素酯的生物利用度，考察双烟酸姜黄素酯是否代谢为姜黄素。方法 以新西兰家兔为试验对象，采用口服给予双烟酸姜黄素酯纳米粒与双烟酸姜黄素酯原料药后，在不同时间点采血，HPLC测定血中双烟酸姜黄素酯、姜黄素等成分含量，计算体内药物转运动力学参数AUC，比较两者的差别。结果 采用统计矩法中的零阶矩法计算AUC，原料药的AUC平均值为（354.835±8.660）μg·L^-1·h，而纳米粒的AUC平均值为（883.335±16.37）μg·L^-1·h。纳米粒的AUC是原料药AUC的2.486倍。可知纳米粒与原料药相比显著提高了生物利用度；血中未检测到姜黄素。结论 双烟酸姜黄素酯制成纳米粒可显著提高双烟酸姜黄素酯的生物利用度；双烟酸姜黄素酯在体内没有代谢为姜黄素。     

姜黄素纳米乳的制备和药动学及药效学研究

目的 探究姜黄素纳米乳在大鼠体内的药动学特性和对大鼠高脂血症的药效作用。方法 建立大鼠血浆中姜黄素的高效液相色谱-质谱联用（HPLC-MS）含量测定方法,考察纳米乳的体内药动学过程。建立SD大鼠高脂血症动物模型,初步考察姜黄素纳米乳对高脂饮食诱导的大鼠高脂血症的药效作用。结果 体内药动学研究结果表明,以姜黄素原料药为参比制剂,姜黄素纳米乳的相对生物利用度为313.47%;以市售片剂为参比制剂,姜黄素纳米乳的相对生物利用度为279.52%。纳米乳组的Cmax为原料药组的201.48%,为片剂组的193.02%,且比原料药组及片剂组具有更高的MRT值（为原料药组的183.52%,是片剂组的154.21%）。药效学研究结果表明姜黄素纳米乳口服给药系统能显著降低模型大鼠的血清总胆固醇（TC）、低密度脂蛋白（LDLc）,缓解高脂饮食给模型大鼠造成的肝脏脂质沉积及肝损伤。结论 姜黄素纳米乳口服给药系统能够有效改善姜黄素的生物利用度,具有良好的降血脂作用,并能够控制高脂血症大鼠体重增长和改善由脂质代谢紊乱造成的肝脏系数变化。     

基于马来酰亚胺基团的肠道黏附纳米粒对改善药物口服生物利用度的研究

目的探索基于马来酰亚胺与肠道黏蛋白共价结合的肠道黏附纳米粒对药物口服生物利用度的影响,构建新型纳米载体用于增强药物口服吸收。方法通过乳化溶剂挥发法制备包载荧光剂香豆素6的马来酰亚胺肠道黏附纳米粒,对制备的黏附纳米粒与非黏附聚乳酸-羟基乙酸共聚物[poly(lactic-co-glycolic acid),PLGA]纳米粒的外观、粒径进行了表征,通过香豆素6考察了纳米粒的体外释放、肠灌流及体内药动学。结果制备的马来酰亚胺肠道黏附纳米粒呈类球形,粒径为(139.8±2.650)nm,PDI为(0.071±0.062),Zeta电位为(-5.793±0.737)mV。在4℃条件下放置30 d稳定性良好,体外释放实验表明马来酰亚胺纳米粒释放缓慢,没有突释效应。药动学实验表明香豆素6马来酰亚胺纳米粒的体内消除半衰期(t1/2)和药时曲线下面积(AUC0-t)分别是香豆素6非黏附对照纳米粒组的1.17倍和1.42倍,药时曲线下面积(AUC0-t)是香豆素6溶液剂的1.76倍。结论基于马来酰亚胺与肠道黏蛋白共价结合的肠道黏附纳米粒能延长药物肠道滞留时间,增加口服吸收,提高药物口服生物利用度。     

葛根素纳米粒在小鼠体内的药动学

目的：制备葛根素纳米粒并对其理化性质进行考察；比较葛根素纳米粒与葛根素混悬液在小鼠体内的生物利用度。方法：通过伪三元相图确定处方，通过研究葛根素纳米粒的黏度、折光率、粒径等进行质量评价；将小鼠随机分成不同的时间组，灌胃葛根素纳米粒和混悬液以及葛根素注射液，高效液相法测定不同时间小鼠血浆中药物浓度，通过3P97程序计算药动学参数。结果：纳米粒载药量为70g·L，粒径（82．3±19．1）nm；药动学参数表明葛根素纳米粒体内吸收较快，达峰时间推后，持续时间长，绝对生物利用度为50．64％。结论：本方法制备葛根素纳米粒，粒径分布均匀，稳定性好，载药量大。葛根素生物利用度较高，解决了葛根素口服利用度低的问题。     

PCL-PEG-PCL载姜黄素纳米粒子的制备以及体外药物释放的考察

目的制备一种生物可降解、生物相容性良好的姜黄素纳米粒子,并对其体外药物释放行为进行考察。方法采用开环聚合法制备生物可降解的PCL-PEG-PCL三嵌段聚合物,然后采用乳液挥发法制备负载姜黄素的PCL-PEG-PCL纳米粒子,通过透射电镜观察所制备纳米粒子的形貌特征,动态光散射(DLS)测定粒径,采用HPLC测定纳米粒子的包封率和载药量,同时考察其体外药物释放行为。结果姜黄素纳米粒子具有球形结构,粒径在200 nm左右,载药量为(14.23±0.35)%,3 d体外累积释药量65%。结论所制备的姜黄素纳米粒子具有较高的载药量和包封率,同时体外药物释放实验证实姜黄素纳米粒子具有良好的缓释功能。     

Bovine serum albumin nanoparticles improve the antitumour activity of curcumin in a murine melanoma model

Abstract

Curcumin is a natural compound presenting important antitumour activity. However, due to its low aqueous solubility, instability at physiological pH, and low oral bioavailability, its clinical use is limited. Bovine serum albumin (BSA) nanoparticles have been used as drug carriers to improve the drug properties. In this work, curcumin-loaded BSA nanoparticles were developed and the in vitro cytotoxicity over murine melanoma cells and the in vivo antitumour activity in a murine melanoma model were assessed. Nanoparticles presented 150?nm, polydispersity index of 0.16, negative zeta potential, and 45% of curcumin encapsulation efficiency. Curcumin release from nanoparticles was slow and diffusion dependent. In the cytotoxicity assay, free curcumin was more efficient than curcumin-loaded nanoparticles, probably due to the prolonged curcumin release from nanoparticles. However, in a murine melanoma model, curcumin-loaded nanoparticles presented higher antitumour efficiency than free curcumin. BSA nanoparticles are efficient curcumin carriers that may have relevant applications in melanoma treatment.     

Curcumin as potential therapeutic natural product: a nanobiotechnological perspective

Objectives

Nanotechnology‐based drug delivery systems can resolve the poor bioavailability issue allied with curcumin. The therapeutic potential of curcumin can be enhanced by making nanocomposite preparation of curcumin with metal oxide nanoparticles, poly lactic‐co‐glycolic acid (PLGA) nanoparticles and solid lipid nanoparticles that increases its bioavailability in the tissue.

Key findings

Curcumin has manifold therapeutic effects which include antidiabetic, antihypertensive, anticancer, anti‐inflammatory and antimicrobial properties. Curcumin can inhibit diabetes, heavy metal and stress‐induced hypertension with its antioxidant, chelating and inhibitory effects on the pathways that lead to hypertension. Curcumin is an anticancer agent that can prevent abnormal cell proliferation. Nanocurcumin is an improved form of curcumin with enhanced therapeutic properties due to improved delivery to the diseased tissue, better internalization and reduced systemic elimination.

Summary

Curcumin has multiple pharmacologic effects, but its poor bioavailability reduces its therapeutic effects. By conjugating curcumin to metal oxide nanoparticles or encapsulation in lipid nanoparticles, dendrimers, nanogels and polymeric nanoparticles, the water solubility and bioavailability of curcumin can be improved and thus increase its pharmacological effectiveness.     

Long circulating nanoparticles of etoposide using PLGA‐MPEG and PLGA‐pluronic block copolymers: characterization,drug‐release,blood‐clearance,and biodistribution studies

The anti‐leukemic drug, etoposide (ETO), has variable oral bioavailability ranging from 24–74% with a short terminal half‐life of 1.5 h i.v. necessitating continuous infusion for 24–34 h for the treatment of leukemia. In the present study, etoposide‐loaded PLGA‐based surface‐modified nanoparticles (NPs) with long circulation were designed as an alternative to continuous i.v. administration. PLGA‐mPEG and PLGA‐PLURONIC copolymers were synthesised and used to prepared ETO‐loaded NPs by high‐pressure homogenization. The mean particle size of ETO‐loaded PLGA‐MPEG nanoparticles was 94.02±3.4 nm, with an Entrapment Efficiency (EE) of 71.2% and zeta potential value of −6.9±1.3 mV. ETO‐loaded PLGA‐pluronic nanoparticles had a mean particle size of 148.0±2.1 nm, an EE of 73.12±2.7%, and zeta potential value of −21.5±1.6 mV. In vitro release of the pure drug was complete within 4 h, but was sustained up to 7 days from PLGA‐mPEG nanoparticles and for 5 days from PLGA‐pluronic nanoparticles. Release was first order and followed non‐Fickian diffusion kinetics in both instances. ETO and ETO‐loaded PLGA nanoparticles labeled with ^99mTc were used in blood clearance studies in rats where the two coated NPs, ^99mTc‐ ETO‐PLGA‐PLU NP and ^99mTc‐ ETO‐PLGA‐mPEG NP, were found to be available in higher concentrations in the circulation as compared to the pure drug. Biodistribution studies in mice showed that ETO‐loaded PLGA‐MPEG NP and PLGA‐PLURONIC NP had reduced uptake by the RES due to their steric barrier properties and were present in the circulation for a longer time. Moreover, the NPs had greater uptake in bone and brain where concentration of the free drug, ETO, was negligible. Drug delivered from these NPs could result in a single i.v. injection that would release the drug for a number of days, which would be potentially beneficial and in better control of leukemia therapy. Drug Dev Res 71: 228–239, 2010. © 2010 Wiley‐Liss, Inc.     

Polymeric nanoencapsulation of zaleplon into PLGA nanoparticles for enhanced pharmacokinetics and pharmacological activity

Zaleplon (ZP) is a sedative and hypnotic drug used for the treatment of insomnia. Despite its potent anticonvulsant activity, ZP is not commonly used for the treatment of convulsion since ZP is characterized by its low oral bioavailability as a result of poor solubility and extensive liver metabolism. The following study aimed to formulate specifically controlled release nano‐vehicles for oral and parenteral delivery of ZP to enhance its oral bioavailability and biological activity. A modified single emulsification–solvent evaporation method of sonication force was adopted to optimize the inclusion of ZP into biodegradable nanoparticles (NPs) using poly (dl‐lactic‐co‐glycolic acid) (PLGA). The impacts of various formulation variables on the physicochemical characteristics of the ZP‐PLGA‐NPs and drug release profiles were investigated. Pharmacokinetics and pharmacological activity of ZP‐PLGA‐NPs were studied using experimental animals and were compared with generic ZP tablets. Assessment of gamma‐aminobutyric acid (GABA) level in plasma after oral administration was conducted using enzyme‐linked immunosorbent assay. The maximal electroshock‐induced seizures model evaluated anticonvulsant activity after the parenteral administration of ZP‐loaded NPs. The prepared ZP‐PLGA NPs were negatively charged spherical particles with an average size of 120–300 nm. Optimized ZP‐PLGA NPs showed higher plasma GABA levels, longer sedative, hypnotic effects, and a 3.42‐fold augmentation in oral drug bioavailability in comparison to ZP‐marketed products. Moreover, parenteral administration of ZP‐NPs showed higher anticonvulsant activity compared to free drug. Oral administration of ZP‐PLGA NPs achieved a significant improvement in the drug bioavailability, and parenteral administration showed a pronounced anticonvulsant activity.     

Novel formulation of solid lipid microparticles of curcumin for anti‐angiogenic and anti‐inflammatory activity for optimization of therapy of inflammatory bowel disease

Objectives This project was undertaken with a view to optimize the treatment of inflammatory bowel disease through a novel drug delivery approach for localized treatment in the colon. Curcumin has poor aqueous solubility, poor stability in the gastrointestinal tract and poor bioavailability. The purpose of the study was to prepare and evaluate the anti‐inflammatory activity of solid lipid microparticles (SLMs) of curcumin for the treatment of inflammatory bowel disease in a colitis‐induced rat model by a colon‐specific delivery approach. Methods We have developed a novel formulation approach for treating experimental colitis in the rat model. SLMs of curcumin were prepared with various lipids, such as palmitic acid, stearic acid and soya lecithin, with an optimized percentage of poloxamer 188. The SLMs of curcumin were characterized for particle size, drug content, drug entrapment, in‐vitro release, surface morphology and infrared, differential scanning calorimetry and X‐ray studies. The colonic delivery system of SLM formulations of curcumin were further investigated for their anti‐angiogenic and anti‐inflammatory activity using chick embryo and rat colitis models. Key findings Particle size, drug content, drug entrapment and in‐vitro release studies showed that formulation F4 containing one part stearic acid and 0.5% surfactant had the smallest diameter of 108 μm, 79.24% entrapment and exhibited excellent in‐vitro release characteristics when compared with other formulations and pure curcumin. SLMs of curcumin (F4) proved to be a potent angio‐inhibitory compound, as demonstrated by inhibition of angiogenesis in the chorioallantoic membrane assay. Rats treated with curcumin and its SLM complex showed a faster weight gain compared with dextran sulfate solution (DSS) control rats. The increase in whole colon length appeared to be significantly greater in SLM‐treated rats when compared with pure curcumin and DSS control rats. An additional finding in the DSS‐treated rats was chronic cell infiltration with predominance of eosinophils. Decreased mast cell numbers in the mucosa of the colon of SLMs of curcumin and pure curcumin‐treated rats was observed. Conclusions The degree of colitis caused by administration of DSS was significantly attenuated by colonic delivery of SLMs of curcumin. Being a nontoxic natural dietary product, curcumin could be useful in the therapeutic strategy for inflammatory bowel disease patients.     

胰岛素肠溶PLGA纳米粒的制备及体内外性质的评价

目的制备肠溶胰岛素PLGA纳米粒,并对其理化性质、体外释药以及在正常大鼠体内的降血糖效果进行研究。方法采用改良的乳化溶剂扩散法分别制备了胰岛素PLGA纳米粒和肠溶胰岛素纳米粒(PLGA HP55 NP、PLGA HP50 NP)。通过激光粒度测定仪测定粒径大小,系统考察了肠溶材料HP55的用量及类型对纳米粒性质的影响,以及各种纳米粒在人工胃液、人工肠液中的释药行为和其在正常大鼠体内的降血糖作用,并与PLGA HP50 NP进行了比较。结果制得的最终处方的肠溶纳米粒(PLGA HP55)的粒径为(169±16)nm,胰岛素的载药量为(3.17±0.24)%。肠溶纳米粒在人工胃液中的释药速率明显低于PLGA纳米粒。PLGA纳米粒和肠溶PLGA HP50、PLGA HP55纳米粒均能显著降低正常大鼠的血糖浓度,其在正常大鼠体内24 h相对于皮下注射给药的相对生物利用度分别为(5.46±0.7)%、(6.31±0.64)%和(8.72±0.5)%。结论胰岛素肠溶纳米粒可以有效抑制胰岛素在人工胃液中的释放,与PLGA纳米粒相比显著降低正常大鼠的血糖浓度。其中PLGA HP55纳米粒的降糖作用显著高于PLGA HP50纳米粒。pH值高的纳米粒有望成为胰岛素口服给药的有效载体。     

Development and characterization of oxaceprol-loaded poly-lactide-co-glycolide nanoparticles for the treatment of osteoarthritis

Oxaceprol is well-defined therapeutic agent as an atypical inhibitor of inflammation in osteoarthritis. In the present study, we aimed to develop and characterize oxaceprol-loaded poly-lactide-co-glycolide (PLGA) nanoparticles for intra-articular administration in osteoarthritis. PLGA nanoparticles were prepared by double-emulsion solvent evaporation method. Meanwhile, a straightforward and generally applicable high performance liquid chromatography method was developed, and validated for the first time for the quantification of oxaceprol. To examine the drug carrying capacity of nanoparticles, varying amount of oxaceprol was entrapped into a constant amount of polymer matrix. Moreover, the efficacy of drug amount on nanoparticle characteristics such as particle size, zeta potential, morphology, drug entrapment, and in vitro drug release was investigated. Nanoparticle sizes were between 229 and 509 nm for different amount of oxaceprol with spherical smooth morphology. Encapsulation efficiency ranged between 39.73 and 63.83% by decreasing oxaceprol amount. The results of Fourier transform infrared and DSC showed absence of interaction between oxaceprol and PLGA. The in vitro drug release from these nanoparticles showed a sustained release of oxaceprol over 30 days. According to cell culture studies, oxaceprol-loaded nanoparticles had no cytotoxicity with high biocompatibility. This study was the first step of developing an intra-articular system in the treatment of osteoarthritis for the controlled release of oxaceprol. Our findings showed that these nanoparticles can be beneficial for an effective treatment of osteoarthritis avoiding side effects associated with oral administration.     

Design of Biodegradable Nanoparticles for Oral Delivery of Doxorubicin: <Emphasis Type="BoldItalic">In vivo</Emphasis> Pharmacokinetics and Toxicity Studies in Rats

Purpose  Doxorubicin, a potent anticancer drug associated with cardiotoxicity and low oral bioavailability, was loaded into nanoparticles with a view to improve its performance. Methods  Doxorubicin loaded PLGA nanoparticles were prepared by a double emulsion method. The pH dependent stability of nanoparticles in simulated fluids was evaluated. DSC and XRD studies were carried out in order to ascertain the nature of doxorubicin in formulations in conjunction with accelerated stability studies. The in vitro release was investigated in phosphate buffer. The pharmacokinetic and toxicity studies were conducted in rats. Results  Nanoparticles had an average size of 185 nm, with 49% entrapment at 10% w/w of polymer. The particles displayed good pH dependent stability in the pH range 1.1–7.4. DSC and XRD studies revealed the amorphous nature of doxorubicin in nanoparticles and the accelerated stability studies revealed the integrity of formulations. Initial biphasic release (20%) followed by a sustained release (80%) for 24 days was observed under in vitro conditions. The doxorubicin loaded nanoparticles demonstrated superior performance in vivo as evident by enhanced bioavailability and lower toxicity. Conclusions  Together, the data indicates the potential of doxorubicin loaded nanoparticles for oral chemotherapy. Further, these formulations could be explored for new indications like leishmaniasis.     

卡波姆包衣姜黄素脂质体的制备及体外黏附性考察

目的探讨提高难溶性药物口服生物利用度的方法。方法采用薄膜分散法制备姜黄素脂质体,采用孵育法对姜黄素脂质体进行卡波姆包衣并考察姜黄素脂质体包衣前后稳定性、包封率及相对包衣率的变化,采用离体大鼠小肠孵育法考察卡波姆包衣姜黄素脂质体体外黏附性。结果卡波姆包衣对脂质体的稳定性影响较大,当卡波姆的质量浓度为5.0 g.L-1时脂质体最稳定;脂质体包衣后包封率略有下降,相对包衣率随着卡波姆质量浓度的增大而增大;质量浓度同为5.0 g.L-1的条件下,卡波姆包衣脂质体的体外生物黏附性比壳聚糖包衣的体外生物黏附性大,未包衣的脂质体体外生物黏附性很小。结论作为药物载体,卡波姆包衣脂质体具备了难溶性药物姜黄素口服给药的条件,将有很好的应用前景。