紫外分光光度法测定靶向修饰固体脂质纳米粒中姜黄素的含量

目的：建立靶向修饰的姜黄素固体脂质纳米粒（PSLN）制剂中姜黄素（CUR）含量测定的方法。方法：采用紫外分光光度法,通过测定波长464nm处的吸光度,计算PSLN制剂中CUR的含量。结果：CUR在1．1．1．7ug／ml的浓度范围内,与464nm处的吸光度线性关系良好,回归方程为Y=0．1424X＋0．0436（r=0．9991）,平均回收率为99．16％,RSD为0．95％（n=9）。结论：本方法操作简单,且稳定性、准确度和精密度均符合要求,可用于PSLN制剂中CUR含量的测定。     

HPLC法测定复方吴茱萸碱纳米乳中吴茱萸碱的含量

目的:建立HPLC法测定复方吴茱萸碱纳米乳制剂中吴茱萸碱含量的方法。方法:采用HPLC法在225 nm波长处测定峰面积,测定复方吴茱萸碱纳米乳中吴茱萸碱的含量。结果:表明吴茱萸碱在225 nm处有最大吸收,浓度在0.52μg·mL至16.64μg·mL-1时与峰面积呈良好的线性关系,回归方程为:A=214.3C-5.943,r=0.9997(n=6);平均回收率为99.31%,RSD为0.74%,符合测定的要求;日内及日间精密度的RSD均小于1%(n=5)。结论:本方法准确度高、专属性好,可用于纳米乳制剂中吴茱萸碱含量的测定。     

ATR/FTIR技术和红外透射法用于蔬菜中农药含量测定的比较研究

从理论和样品分析两方面比较了ATR/FTIR技术和红外透射法,并分别用这两种红外技术测定了蔬菜中氯氰菊酯含量.结果表明:氯氰菊酯在916cm-1处的吸收峰不受青菜叶谱图干扰,可选择此峰为定量分析波数.以峰面积定量,运用ATR/FTIR技术和红外透射法分别得到峰面积Y和样品浓度X的线性方程:y=1.423x-0.0021,相关系数R=0.9979;y=26.025x-2.2847,相关系数R=0.9971,其最低检出线分别为0.01 mg和0.15 mg.ATR/FTIR技术相对于传统红外透射法其测定灵敏度更高,且完全不需对样品进行预处理.     

HPLC法同时测定风湿骨痛液中常春藤 皂苷元和齐墩果酸的含量

摘 要:目的 建立HPLC法同时测定风湿骨痛液中常春藤皂苷元、齐墩果酸含量。方法 采用PFchrom C18色谱柱,流动相乙腈 水（90∶10）,流速1.0 mL·min-1,柱温25 ℃,检测波长为205 nm,进样量10 μL。结果 常春藤皂苷元、齐墩果酸具有良好的线性关系,其线性范围分别为32.76~655.20 μg·mL-1（r =0.9995）、20.88~417.60 μg·mL-1（r =0.9996）;平均回收率（n=9）分别为99.19 %、99.74 %,RSD分别为0.91 %、1.08 %。含量测定结果（n =3）分别为0.0947~0.0961 mg·mL-1、0.0473~0.0489 mg·mL-1。结论 该方法为提高风湿骨痛液的质量标准研究提供了参考。     

HPLC法测定复方托吡卡胺滴眼液中苯扎氯铵的含量

目的：建立超高效液相色谱法测定复方托吡卡胺滴眼液中苯扎氯铵的含量测定方法。方法：色谱柱为Alltech Alltima -CN（250cm ×4．6mm ,5μm）,流动相为0．1mol?L -1醋酸钠溶液（用冰醋酸调节pH值至5．0）-乙腈（60：40）,检测波长254nm ,流速为2．0ml?min -1,柱温30℃,进样体积50μL。结果：苯扎氯铵在0．02至0．5mg?mL -1浓度范围内线性关系良好（r＝0．9999）;平均回收率为98．91％,RSD＝0．44％（n＝9）。结论：该方法准确、简便、快速、可靠,能有效控制复方托吡卡胺滴眼液中苯扎氯铵的含量。     

紫外分光光度法测定姜黄素固体脂质纳米粒的包封率

建立姜黄素固体脂质纳米粒的包封率测定方法。采用紫外分光光度法测定姜黄素固体脂质纳米粒中姜黄素的含量,由此计算包封率。透射电镜下姜黄素固体脂质纳米粒成圆形或椭圆形,平均粒径为(130.7±2.4)nm。姜黄素在432 nm处有最大吸收波长,浓度在1.05vg/mL至7.35μg/mL范围时与吸光度呈良好的线性关系,回归方程为:A=0.1320C+0.0310,r=0.9993(n=7);平均回收率为99.39%,RSD为0.49%;测得姜黄素固体脂质纳米粒的包封率为90.90%,RSD为0.82%。本方法操作简单易行,准确度和精密度均符合要求,可用于姜黄素固体脂质纳米粒包封率的测定。     

紫外分光光度法测定溴新斯的明多囊脂质体的包封率

目的:建立紫外分光光度法测定溴新斯的明多囊脂质体的包封率.方法:通过离心法分离游离药物,测定溴新斯的明多囊脂质体的包封率.结果:溴新斯的明浓度在80至560μg·mL-1范围内与吸光度呈良好的线性关系,回归方程为:A=0.0016C至0.0089,r=0.9999;平均回收率为102.96％,RSD为1.88％(n=9).结论:本方法操作简单、快速、重复性好,可用于溴新斯的明多囊脂质体包封率的测定.     

ZnO纳米颗粒的紫外光探测器制备及其特性

为了发展高性能、低成本和结构简单的ZnO紫外 光探测器。在本文中,利用溶液法,制备出ZnO 纳米颗粒,采用透射电子显微镜(TEM)、X射线衍射仪(XRD)、紫外-可见分光光度计和荧光 光谱仪,分别 研究了ZnO纳米颗粒的形貌、晶相结构和光学特性。结果显示:样品呈球形状的颗粒,尺寸 分布在6~8.5nm 之间,平均粒径为7.1nm,为六方纤锌矿结构。发现ZnO纳米颗 粒的陡峭吸收边出现在370nm附近,在390nm 处出现一个很强的近带边发射峰和一宽泛的可见光发光带。此外,利用制备的ZnO纳米颗粒 ,旋涂在刻蚀 有叉指电极的FTO(SnO₂:F)上,制备出紫外光探测器,测试了它在暗态和365 nm紫外光照下的电流-电压(I-V) 和电流-时间(I-t)特性。结果表明:紫外光探测器的灵敏度、光响应度、响 应时间、恢复时间分别为62.4(在 －3.5V处),13.6A/W(在+5V处), 15s。另外,它的光响应机理主要由于ZnO纳米 颗粒表面吸附的氧起主导作用。     

Engineered Lipid Nanoparticles for the Treatment of Pulmonary Fibrosis by Regulating Epithelial-Mesenchymal Transition in the Lungs

Pulmonary fibrosis is a chronic and irreversible lung disease with limited therapeutic regimens. Advances in elucidating the pathophysiological mechanism and discovering novel therapeutic interventions are still in urgent need. Here, the engineered lipid nanoparticles (LNPs) are developed for delivering RNA therapeutics to the lungs. Three different types of LNPs (native, cationic, and ligand incorporated) are optimized to facilitate the pulmonary delivery of RNAs. Among them, the mannose incorporated LNPs (Mannose LNPs) outperform the others and show efficient delivery of siRNAs down-regulating the epithelial-mesenchymal transition (EMT) associated protein, G2 and S phase-expressed protein 1 (GTSE1). Treatment with the mannose LNPs confirms a significant decrease in collagen accumulation and EMT-related proteins in the fibrosis animal models and provides functional recovery from pulmonary fibrosis. This approach demonstrates that engineered LNPs can facilitate the delivery of RNA therapeutics to the lungs and potentially open a new regimen of treatment for pulmonary fibrosis.     

Stabilizing RNA Nanovaccines with Transformable Hyaluronan Dynamic Hydrogel for Durable Cancer Immunotherapy

Massage RNA (mRNA) vaccines represent a new strategy for advanced cancer immunotherapy. To protect mRNA from degradation and deliver to targeted cells, lipid nanoparticles (LNPs) are extensively utilized as non-viral vectors. However, the stability of mRNA-laden LNPs substantially hinders their clinical application. Development of thermostable and durable mRNA nanovaccines is urgently needed. Here, a hyaluronan dynamic hydrogel is reported to protect mRNA and resiquimod (R848)-laden LNPs (HA-mRLNPs) from degradation at room temperature for durable cancer immunotherapy. A microfluidic device is proposed to effectively encapsulate mRNA and immunoadjuvants in LNPs (mRLNPs). Then, hyaluronan dynamic hydrogel is used to stabilize LNPs during storage at room temperature by restricting the migration and fusion of LNPs. Particularly, gel-like hyaluronan undergoes state transition for controlled release of mRLNPs under physiological condition. Therefore, HA-mRLNPs can efficiently deliver mRNA encoding tumor antigens to dendritic cells for antigen presentation to induce antigen-specific CD8⁺ T cells for killing tumor cells. Overall, this study demonstrates that the LNPs-hydrogel system can be used for effective cancer immunotherapy.     

高效液相色谱法测定头孢噻吩钠含量和有关物质

建立高效液相色谱法（HPLC）测定头孢噻吩钠含量和有关物质。色谱条件以C18为固定相,色谱柱：（4.6mm×250mm,5μm）;流动相为0.207mol/L醋酸钠溶液（用冰醋酸调pH值至5.9）-乙醇-乙腈（82：2：16）,流速为：1.0mL/min;检测波长：254nm：柱温;40℃。结果：头孢噻吩钠含量在55.8μg/mL至464.4μg/mL呈良好线性关系,r=0.9999：平均回收率100.2%;最低检测限为3ng（1ng/μL×3μL）。本法简单、准确,重现性、分离效果好,能较好的进行孢噻吩钠含量和有关物质测定。     

Harnessing Topology and Stereochemistry of Glycidylamine-Derived Lipid Nanoparticles for in Vivo mRNA Delivery to Immune Cells in Spleen and Their Application for Cancer Vaccination

mRNA lipid nanoparticles (LNPs) have reached an inflection point and are now paving the way for a new wave of precision therapies. The design of nonhepatocyte RNA delivery systems without targeting ligands, however, remains a challenge. It is reported that the development of ligand-free glycidylamine (GA) derivatives containing LNPs (GA-LNPs) that preferentially deliver mRNA to immune cells in the spleen. Notably, it is demonstrated that the stereochemistry of GA-lipids has a significant impact on their self-assembly and in vitro and in vivo RNA delivery efficiency and tropism. This impact is dependent on the monomeric structure of GA and number of stereogenic centers. Furthermore, the nonlinear topology of GA lipid derivatives induced a sevenfold improvement in mRNA delivery efficiency. The top-performing estriol-GA05-30 LNPs elicited strong antitumor activity in a therapeutic and prophylactic cancer model and are well tolerated in mice. These results highlight the significance of the chemistry of ionizable lipids for extrahepatic RNA delivery and indicated a promising direction for the development of next-generation mRNA immunotherapies.     

视觉测量中圆形标记点的高精度定位

为了消除透视变换过程中产生的圆心偏差,基于交 比不变和配极对应原理,提出了一种利用同心圆目标精确定 位圆心在图像中的真实投影点的方法。首先介绍相关的理论基础,然后详细介绍了算法 的实现步骤,最后通过仿真和真 实图像实验验证算法的正确性以及影响圆心定位精度的因素。实验结果表明,本文算法可以 稳定、准确地获取圆形目标的真 实投影点,且投影点的定位精度要优于0.2pixel,相较椭圆拟合法 具有明显的精度优势;同时,本文算法仅包含简单的线性运 算,因此具有较高地运算效率。由于本文算法对摄像机和同心圆的物理参数无任何要求,因 此具有应用广泛的特点。     

Lipid Nanoparticles for Broad-Spectrum Nucleic Acid Delivery

Lipid nanoparticles (LNPs) are the most advanced nonviral modality for nucleic acid (NA) delivery, and have recently gained enormous attention in the fields of RNA therapeutics and vaccine development. Here, ionizable adamantane-based lipidoids named XMaNs, which circumvent the usual need for laborious optimization of LNP components for highly diverse types of NAs, are described. The non-toxic XMaN6 lipidoid is highly versatile in entrapment and delivery of siRNA, mRNA, plasmid DNA, and a cyclic dinucleotide. XMaN6-based LNPs efficiently deliver: 1) siRNA into human primary hepatocytes and cell lines that are hard-to-transfect; 2) mRNA into mouse liver; 3) plasmid DNA; 4) 2′,3′-cGAMP into cells and activated the cGAS-STING pathway three orders of magnitude more efficiently than 2′,3′-cGAMP alone. To our knowledge, such universality in delivering different NA types has not been previously described and can accelerate translation of LNPs into the clinic.