pH-sensitive Nanoparticles for High Loading and Efficient Delivery of Doxorubicin

An acid-sensitive delivery system based on acylhydrazone bond was developed for high loading and efficient delivery of doxorubicin.Doxorubicin(DOX)was covalently combined with dihydrazide adipate to form acid-sensitive hydrazone bond based on Schiff base reaction,then the intermediate was covalently combined with carboxymethyl chitosan through amide bond to form polymeric prodrugs,and nanoparticles were formed through self-assembling.Moreover,the structural and particle properties of CMCS-ADH-DOX were characterized by ultraviolet visible near infrared spectrophotometry(UV),nuclear magnetic resonance spectroscopy(^(1)H-NMR),fourier transform infrared spectroscopy(FT-IR),dynamic light scattering(DLS),and transmission electron microscopy(TEM).The mean diameter of the self-assembled nanoparticles is 165 nm,while the morphology is a relatively uniform spherical shape.Moreover,these DOXloaded nanoparticles showed pH-triggered drug release behavior.Compared with free DOX,CAD NPs showed lower toxic side effects in L929 cells and similar toxicity in 4T1 cells.The experimental results indicate that the CMCS-ADH-DOX nanoparticles may be used as an acid-sensitive targeted delivery system with good application prospect for cancer.

蜈蚣药材商品规格等级标准研究

[目的]理清蜈蚣药材流通现状,制定蜈蚣药材商品规格等级标准,用于指导规范蜈蚣药材流通。[方法]在本草考证的基础上,进行市场流通现状调研,确定其与蜈蚣主要产地流通现状之间的联系。[结果]蜈蚣药材存在“蜈蚣条”和“蜈蚣皮”2种规格,根据长度将“蜈蚣条”划分为3个不同等级,“蜈蚣皮”为统货。[结论]新的蜈蚣药材规格等级标准的制定对于指导市场蜈蚣药材流通具有重要意义,也为蜈蚣药材的化学成分和分子机制研究奠定基础。

中药活性成分单用及联合化疗药物抗肿瘤研究进展

恶性肿瘤是威胁人类健康的一类重大慢性疾病,目前化疗仍是治疗肿瘤的主要手段,但化疗在治疗肿瘤的同时会对机体产生一系列不同程度的损伤。随着分离技术和药效机制评价方法的快速发展,越来越多新型中药的活性成分被发现具有抗肿瘤作用。该文通过查阅大量国内外文献,针对中药活性成分发挥抗肿瘤作用及作用机制进行综述,并对目前中药有效成分单用及与化疗药物联合应用的现状进行分析,以期为中药进一步抗肿瘤及临床研究提供参考。

基于UPLC-Q-TOF-MS技术的通滞苏润江片化学成分分析

目的:采用超高效液相色谱串联四极杆飞行时间质谱联用技术(UPLC-Q-TOF-MS)对复方通滞苏润江片中的化学成分进行定性研究,阐明其所含部分化合物可能的裂解途径。方法:色谱柱为YMC-Triart C_(18)(2.1 mm×100 mm,1.9μm),以乙腈-0.1%甲酸水溶液为流动相,梯度洗脱,体积流量0.4 mL·min^(-1),柱温35℃。采用电喷雾离子源,正、负离子模式扫描,扫描范围m/z 50~1200,对通滞苏润江片复方及其单味药材进行扫描。根据精确质荷比和二级碎片离子信息,结合对照品和文献数据鉴定通滞苏润江片中的化学成分。结果:共指认出通滞苏润江片中60个化学成分,包括生物碱类、黄酮类、鞣质类、酚酸类、蒽酮类等。结论:该化学成分研究为通滞苏润江片的有效物质基础研究及质量控制提供了理论和实践依据。