三聚磷酸钠修饰叶黄素纳米脂质体及释放性能研究

研究三聚磷酸钠(TPP)修饰对叶黄素纳米脂质体的影响。以叶黄素为研究对象,采用乙醇注入法制备叶黄素纳米脂质体,并采用TPP对叶黄素纳米脂质体进行修饰,考察了粒径、电位分布和体外释放性能。通过单因素和正交试验优化得到了叶黄素纳米脂质体的最佳制备工艺条件:当TPP用量为30 mg/m L,温度60℃,修饰时间1.0 h时,此条件下叶黄素纳米脂质体包封率为98.90%,比修饰前提高了4.4%。修饰后的叶黄素纳米脂质体释放性能明显提高。     

叶黄素纳米脂质体的制备工艺优化及其氧化稳定性

以叶黄素晶体为原料,采用乙醇注入法制备叶黄素纳米脂质体。在单因素试验基础上采用响应面试验,优化叶黄素纳米脂质体的制备工艺,得到了叶黄素纳米脂质体的最佳制备工艺条件为:叶黄素用量0.51 mg/m L、卵磷脂与胆固醇(质量比4∶1)用量5.0%、pH 7.4、温度62.9℃。此条件下叶黄素纳米脂质体包封率为(91.20±0.56)%,平均粒径为(226.8±10.62)nm;透射电子显微镜分析显示,所制备的叶黄素纳米脂质体呈球形纳米结构,叶黄素在纳米脂质体内部均匀分布;1,1-二苯基-2-三硝基苯肼(1,1-dipheny1-2-picrylhydrazyl,DPPH)自由基清除研究结果表明,叶黄素及其纳米脂质体的DPPH自由基清除活性与其质量浓度呈正相关,叶黄素纳米脂质体可有效提高叶黄素的热稳定性和抗氧化性能。     

共包埋姜黄素和还原型谷胱甘肽的纳米脂质体的制备、修饰与表征

以大豆卵磷脂为壁材,制备共包埋姜黄素（curcumin,CUR）和还原型谷胱甘肽（glutathione,GSH）的纳米脂质体,通过静电自组装将壳聚糖和海藻酸钠修饰到纳米脂质体表面,采用激光粒度仪、透射电镜、傅里叶变换红外光谱仪等设备对脂质体的包埋率、体外释放、微观形貌、稳定性等进行表征,测定纳米脂质体同时递送CUR和GSH的能力。结果表明,CUR的包埋率为100%,与GSH共包埋及多糖修饰均没有影响CUR的包埋率;而与CUR共包埋时,GSH的包埋率从7.90%增加到27.03%,经多糖修饰后,进一步增加到41.22%。共包埋纳米脂质体对CUR的释放没有显著影响,但使GSH的释放率由51.2%减小至23.6%;经多糖修饰后,单包埋和共包埋纳米脂质体对CUR和/或GSH的缓释作用都增强。另外,共包埋使脂质体的平均粒径从（95.02±1.93）nm增加到（132.47±18.14）nm,Zeta电位从（-22.47±1.96）mV增加到（-14.70±0.46）mV;经壳聚糖和海藻酸钠双层修饰后,共包埋脂质体的平均粒径进一步增加到（161.97±5.58）nm,而Zeta电位减小到（-40...     

绿原酸纳米脂质体制备与抑菌性分析

目的：研究绿原酸纳米脂质体制备及其抑菌性。方法：采用薄膜超声法制备绿原酸纳米脂质体,并用扫描电镜和粒度仪分析测定其形貌及粒径,考察膜材比、药脂比及超声时间对包封率的影响,最后对其体外稳定性和抑菌能力进行评价。结果：胆固醇与卵磷脂质量比1∶8、绿原酸与膜材质量比1∶10、超声时间15 min所制备的绿原酸纳米脂质体呈椭圆形,形态规整,粒径在110 nm左右,分散性良好,包封率和载药量最高分别达到87.5%和36%;紫外测试表明绿原酸被成功包覆在脂质体中;体外缓释实验表明,在24 h和14 d中绿原酸纳米脂质体均释放稳定;在抑菌实验中,绿原酸纳米脂质体与绿原酸和四环素相比具有更持久的抑菌能力。结论：采用薄膜超声法制备的绿原酸纳米脂质体具有很好的形貌和分散性能,也具有很好持续抑菌能力。     

叶酸-壳聚糖修饰姜黄素纳米脂质体的制备及其性质

采用叶酸-壳聚糖复合物修饰纳米脂质体,用于包埋姜黄素,得到叶酸-壳聚糖修饰的姜黄素纳米脂质体。经叶酸-壳聚糖复合物修饰后,脂质体的粒径和电位分别由（67.4±2.3）nm和（－13.81±2.75）mV变为（103.6±4.1）nm和（16.35±3.54）mV;与姜黄素纳米脂质体相比,复合物修饰的姜黄素纳米脂质体在25?℃具有更好的贮存稳定性,两者均具有良好的缓释性能,且复合物修饰后的脂质体在弱酸性环境中释放速率较弱碱性更快。此外,修饰前后的空白脂质体均未检测出细胞毒性,且由于叶酸-壳聚糖复合物修饰能增加姜黄素脂质体的细胞摄取量,修饰后的姜黄素脂质体的细胞毒性大于未经复合物修饰的姜黄素脂质体。     

亚麻籽油纳米脂质体的制备及体外释放性能研究

为了达到避免亚麻籽油氧化和提高机体消化吸收的目的,通过纳米脂质体包埋技术,采用乙醇注入-超声法制备亚麻籽油纳米脂质体。由单因素实验优化亚麻籽油纳米脂质体制备工艺,并对制备的脂质体进行了表征,对其体外释放性能进行了研究。结果表明:制备亚麻籽油纳米脂质体的最佳工艺条件为磷酸盐缓冲液p H 6.6、亚麻籽油添加量40%(占大豆卵磷脂、β-谷甾醇和吐温-80总量的比例)、超声时间20 min、超声功率141 W,在此条件下亚麻籽油纳米脂质体的包封率为84%,平均粒径为97 nm,平均电位为-3.5 m V,多分散指数为0.226;在透射电镜下观察到的亚麻籽油纳米脂质体呈圆球状而且分散均匀;在模拟胃肠液消化过程中,亚麻籽油纳米脂质体的释放行为分别符合零级动力学方程和Higuchi方程。     

红曲红色素纳米脂质体的制备及体外释放研究

以大豆卵磷脂和胆固醇为膜材,采用薄膜-超声法制备红曲红色素纳米脂质体,以包封率为评价指标,并考察其体外释放性能。结果表明,红曲红色素纳米脂质体的最佳制备参数为胆固醇：卵磷脂（w／w）比例1：4,红曲红色素与卵磷脂（w／w）比例0．04：1,温度40℃,缓冲液pH值6．8,该条件下包封率可达40．82％,载药量达66．53％。体外释放研究表明,红曲红色素以脂质体形式在人工胃液或肠液存在时,缓释效果明显。     

纳米脂质体提高叶黄素的稳定性

以高纯度叶黄素为目标活性成分,采用乙醇注入法制备叶黄素纳米脂质体。研究不同条件如储藏时间、光照、温度、p H对叶黄素及其纳米脂体中叶黄素降解率的影响,考察不同条件下纳米脂体对叶黄素稳定性的增强作用。结果表明,纳米脂质化前后的叶黄素在不同条件下的稳定性差别较大,在叶黄素浓度及含量均相同条件下,叶黄素及其纳米脂体中叶黄素的稳定性均受到不同条件影响而发生降解,但经脂质纳米化后的叶黄素由于脂质体的保护作用其降解率显著降低;透射电镜结果显示,脂质体对叶黄素的包覆效果明显,进而增强了叶黄素稳定性。研究为叶黄素在食品工业中的储藏和应用提供参考。     

茶多酚纳米脂质体悬浮液的制备与性质研究

用乙醇注入法制备了茶多酚纳米脂质体悬浮液,考察了超声与高压均质2种后处理方式对脂质体包封率与粒径的影响。结果发现:2种后处理方式对包封率的影响差别不大,但经高压均质处理制备得到的脂质体粒径较小。对乙醇注入-高压均质后处理制备的茶多酚纳米脂质体悬浮液的性质研究表明:其平均粒径为91.4nm,多分散指数为0.114;在pH 7.0、离子强度为0.05 mol/L的磷酸盐缓冲液(PBS)中的释放动力学特性基本符合一级动力学模型;随着贮藏时间的延长或贮藏温度的升高,体系的稳定性下降。     

豆豉纤溶酶载纳米脂质体的制备与表征

为提高豆豉纤溶酶口服生物利用度,建立了豆豉纤溶酶载纳米脂质体系统,并对其表征进行评价。采用硫酸铵梯度法制备的豆豉纤溶酶纳米脂质体的包封率为(52.74±4.24)%,粒径(72.04±31.2)nm,平均Zeta电位-44.2 mV,PdI 0.237。试验结果表明:豆豉纤溶酶纳米脂质体在体外稳定性好,在人工肠液中的释放符合一级动力学释放规律,豆豉纤溶酶在12 h后释放接近完全,无突释现象。豆豉纤溶酶及载酶纳米脂质体肠吸收液酶活性测定结果表明:豆豉纤溶酶及其载酶纳米脂质体在小肠均有吸收,吸收后仍具有纤溶活性。纳米脂质体可有效促进豆豉纤溶酶的吸收。     

Effect of nanoliposomal entrapment on antioxidative hydrolysates from goose blood protein

In this study, the encapsulation of goose blood hydrolysate (GBH) was performed within nanoliposomes. We investigated the physicochemical properties, stability, antioxidant indices, the morphology of nanoparticles, the digestion stability in simulated gastrointestinal fluid, differential scanning calorimetry (DSC) analysis, and Fourier transform infrared (FTIR) spectroscopy. GBH was successfully encapsulated into nanoliposomes using reverse-phase evaporation method. The entrapment efficiency of GBH-loaded nanoliposomes was about 70.99 ± 2.85%, the average particle size was 93.3 ± 2.45 nm, the zeta-potential of GBH-loaded nanoliposomes was −30 mV, and the morphology of GBH-loaded nanoliposomes was characterized by transmission electron microscope. Moreover, the results of DSC and FTIR showed that the GBH nanoliposome was more stable than the empty liposomes due to hydrogen bond complexation between liposome and GBH. The release of GBH from nanoliposomes could be significantly controlled, and the release ratios were 48.9 ± 2.96% in simulated gastric fluid and 59.9 ± 5.30% in simulated intestinal fluid, respectively, proving that degradation rate of antioxidant activities of GBH encapsulated in nanoliposomes was decreased. In conclusion, nanoliposomes embedding is a promising and effective way to increase the stability of hydrolysates from GBH and produce various types of functional food.     

Preparation, characterization and the stability of ferrous glycinate nanoliposomes

Ferrous glycinate nanoliposomes prepared by the reverse-phase evaporation method (REV) from egg phosphatidylcholine (EPC) were investigated, based on the encapsulation efficiency, transmission electron microscopy (TEM), size distribution, and zeta potential. The nanoliposomes had high encapsulation efficiency, and TEM photomicrographs of nanoliposomes clearly showed their spherical shape. The size distribution and zeta potential indicated the stability of the nanoliposome suspensions. Retention ratio and size distribution of ferrous glycinate nanoliposomes were used to determine the influence of storage period, sonication and boiling water on the stability of ferrous glycinate nanoliposomes. Furthermore, in vitro stability of ferrous glycinate nanoliposomes in simulated gastrointestinal juice was evaluated. The nanoliposomes showed an acceptable stability in simulated gastrointestinal juice at 37 °C for 5 h. According to the results, ferrous glycinate nanoliposomes may be fit for the oral administration of ferrous glycinate and be used for the fortification of foodstuffs.     

Nanoliposomal encapsulation of chia oil for sustained delivery of α-linolenic acid

Chia oil is a popular source of ω-3 fatty acids, typically α-linolenic acid. This study reports the encapsulation of chia oil in nanoliposome to protect ω-3 fatty acids and to obtain a sustained release of chia oil during digestion. Nanoliposomal encapsulation was carried out using solvent evaporation, followed by sonication. The encapsulation process was conducted using different lipid contents, with different concentrations of soy phosphatidylcholine (S), Tween 80 (T) and volumes of the aqueous phase. The maximum encapsulation efficiency was found to be 88.31%, and the average particle size was 49.25 nm; a moderate repulsion among the particles was observed. Differential scanning calorimetry study revealed enhanced thermal stability of chia oil in nanoliposomes. A negligible release (3.39%) of encapsulated chia oil was observed in the simulated gastric fluid, and a 74.72% sustained release was recorded in the simulated intestinal fluid. This formulation can be a suitable supplement of ω-3 fatty acids for food and therapeutic applications.     

辅酶Q10纳米脂质体配方与工艺优化研究

采用乙醇注入-超声法制备辅酶Q10纳米脂质体,以包封率、保留率、平均粒径以及平均粒径的变化程度作为响应指标,应用正交试验法优选辅酶Q10纳米脂质体的配方和制备工艺。最佳配方为磷脂:胆固醇:吐温80:辅酶Q10=2.5:0.4:1.8:1.2(W/W),水相为0.01mol/L磷酸盐缓冲液(pH7.4);最佳制备工艺条件为乙醇用量1ml,搅拌时间10min,水化温度45℃,超声功率450W。以优化配方和工艺制得的脂质体形态均匀,粒径分布范围在20～300nm之间,平均粒径为68nm,包封率高于95%,4℃下贮存四个月,粒径分布无显著变化,平均粒径的变化程度小于10%,保留率高于90%。经优化得到的辅酶Q10纳米脂质体配方合理、工艺简便可行、包封率高、稳定性好。     

Preparation and physicochemical characteristics of an allicin nanoliposome and its release behavior

Allicin, the main active component derived from a traditional flavoring agent - garlic, exerts a variety of biological effects. Unfortunately, its high potential in food processing is limited by its sensibility towards heat and alkaline conditions and its pungent smell. In this research, allicin nanoliposomes were prepared using reverse-phase evaporation method in an attempt to circumvent these shortcomings. The process conditions were optimized by response surface methodology, and the optimal parameters obtained were: lecithin-allicin ratio 3.70:1, lecithin-cholesterol ratio 3.77:1, ultrasonic time 3.40 min, organic phase-aqueous phase ratio 3.02:1. The experimental maximum of entrapment efficiency was 75.20 ± 0.62%, which was consistent with the predictive value (75.05%). Various physicochemical characteristics of allicin liposomes were determined and evaluated. The mean size of allicin nanoliposomes with well-defined spherical shape was 145.27 ± 15.19 nm and only a negligible difference was found after 30 days of storage. The allicin nanoliposomes gave a zeta potential of −40.10 ± 0.96 mV. Based upon the in vitro release profiles, allicin nanoliposomes exhibited a sustained-releasing potential in addition to the release behavior followed the first-order equation. The results indicated that the encapsulation of allicin into liposomes proved to be a promising technology for more widespread application.     

不同的壁材对辅酶Q10纳米脂质体包埋效果的影响

辅酶Q10是一种膳食补充剂或营养品,在人体细胞呼吸链的电子传递中起重要作用,采用纳米胶囊技术制备辅酶Q10纳米脂质体可提高其生物利用率。本文以包封率、产率、透光率(T500nm)和贮存稳定性(包括产品T500nm的变化以及芯材辅酶Q10的保留率)为评定指标,选用乙醇注入-超声法制备了包埋效果和贮存稳定性都较好的辅酶Q10纳米脂质体。结果表明,以蛋黄磷脂作为主要壁材制得产品的包埋效果及贮存稳定性均优于大豆磷脂,适量胆固醇以及吐温80的添加可显著改善包埋效果,壁材的最佳配比为:磷脂:胆固醇:吐温80=25:4:18(W/W),在最佳配比下将辅酶Q10与磷脂比提高至20:25(W/W,相应载量为40%)可制得包封率及保留率均高于95%的产品。     

不同的壁材对辅酶Q_(10)纳米脂质体包埋效果的影响

辅酶Q10是一种膳食补充剂或营养品,在人体细胞呼吸链的电子传递中起重要作用,采用纳米胶囊技术制备辅酶Q10纳米脂质体可提高其生物利用率。本文以包封率、产率、透光率(T500nm)和贮存稳定性(包括产品T500nm的变化以及芯材辅酶Q10的保留率)为评定指标,选用乙醇注入-超声法制备了包埋效果和贮存稳定性都较好的辅酶Q10纳米脂质体。结果表明,以蛋黄磷脂作为主要壁材制得产品的包埋效果及贮存稳定性均优于大豆磷脂,适量胆固醇以及吐温80的添加可显著改善包埋效果,壁材的最佳配比为:磷脂:胆固醇:吐温80=25:4:18(W/W),在最佳配比下将辅酶Q10与磷脂比提高至20:25(W/W,相应载量为40%)可制得包封率及保留率均高于95%的产品。