复方脑得生中总黄酮纯化工艺研究

目的研究复方脑得生中总黄酮的最佳纯化工艺。方法采用正交设计和单因素试验法，以总黄酮的洗脱率和含量为指标，考察利用D-101树脂富集、纯化复方脑得生中总黄酮的工艺条件及参数。结果优选纯化工艺为：上样溶液浓度0．1g／mL，流速2aV／h，树脂径高比1：7；吸附后，先用5BV的水洗脱，再用5BV40％乙醇洗脱。所得提取物中总黄酮的含量为80．57％，总黄酮转移率达83．76％。结论优选纯化工艺得到的总黄酮含量高，工艺简单，适宜工业化生产。     

大孔树脂富集三裂叶蟛蜞菊倍半萜内酯A和B的研究

目的 大量富集三裂叶蟛蜞菊倍半萜内酯A，B(WTA，WTB)。方法 采用气相色谱法测定WTA和WTB，并以WTA和WTB的含量、洗脱率、精制度为考察指标，研究D101大孔树脂吸附WTA和WTB的工艺条件及参数。结果 通过大孔树脂吸附后，WTA和WTB的洗脱率达90％，50％乙醇洗脱部分中WTA和WTB的含量为总固物的4．01％～4．09％。结论 可以采用大孔树脂富集WTA和WTB。     

Preparation of Aminated Macroporous Polyvinyl Alcohol Resins and Evaluation for Bilirubin Adsorption

In the present study we prepared macroporous polyvinyl alcohol beads. A series of bilirubin adsorbents were generated by immobilization of eight amine agents to the beads as ligands. The adsorption of bilirubin was evaluated by in vitro static and dynamic adsorption tests. The results show that these adsorbents have excellent adsorption efficiency and capacity. Among the eight ligands, trimethylamine (TMA), triethylamine (TEA) and 1,6- hexanediamine(HDA) showed the highest adsorption capacity. The adsorption equilibrium can be achieved in half an hour, and the adsorption percentage of bilirubin was up to 80%. Static electricity and hydrophobic interaction played the main role in bilirubin adsorption, and the adsorption was found to match the monolayer model. The excellent adsorption of these adsorbents indicates their potential in clinical treatment.     

Formation of Regular Hole Pattern in Polymer Films

Ordered macroporous materials recently have attracted much attention. A method that utilizes the condensation of monodisperse water droplets on a polymer solution is proposed for the preparation of honeycomb microporous films. Our results show that it is a general method that can be used for patterning a wide range of polymers. The presence of water vapor and polymer is necessary for the formation of regular holes in films. The formation of hexagonal packing instead of other kinds of packing takes place because the hexagonal packing has the lowest free energy. The formation mechanisms of regular hole pattern and imperfections in the hexagonal packing are proposed.

Hexagonal hole structures in a PMMA film.     

Effect of a Polymeric Additive on the Pore‐Size Distribution and Shrinking Process of a Hydrogel Network

A systematic comparison of the effect of architectural modifications to the network structure on the internal microstructure of N‐isopropylacrylamide (NIPA) based hydrogels showed that the addition of a second component to the network significantly increased the proportion of macropores in the network. The second components considered were short poly(N‐isopropylacrylamide) (PNIPAM) chains grafted to the network backbone, high‐molecular‐weight polyacrylamide (PAM) chains, or microsphere particles of PNIPAM. Structures are proposed for each of the modified gel networks taking into account the new structural information. Through a combination of the pore size and network structure data reported here, and with the shrinking data obtained previously, shrinking mechanisms are proposed for each of the modified network structures. In all cases, the enhanced shrinking rates were directly caused by the presence of the second component, which acted as nuclei for shrinking (graft‐PNIPAM and PNIPAM microspheres) or as water‐release channels (PAM gel), and indirectly caused by the second components via their affect on the network microstructure.

Proposed structures for the architecturally modified gels based on the pore‐size information. Graft‐PNIPAM gel. The freely mobile graft chains prevent chains from meeting resulting in larger pores.     

Growth and adipogenic differentiation of mesenchymal stromal bone marrow cells during culturing in 3D macroporous agarose cryogel sponges

We studied the possibility of population of macroporous agarose cryogel sponges by mesenchymal stromal bone marrow cells with their subsequent adipogenic differentiation. After 7-day culturing of mesenchymal stromal cells in agarose cryogel, the level of cell proliferation was 35%. After 3-week culturing in a medium inducing adipogenesis we observed accumulation of intracellular neutral lipids positively stained with Oil Red O. These findings can be used for the development of bioengineering constructions of the adipose tissue on the basis of spongy carriers. Translated from Kletochnye Tehnologii v Biologii i Medicine, No. 3, pp. 141–144, August, 2008     

超声辅助大孔树脂技术富集荆芥穗中总黄酮和总酚的工艺研究

目的 通过超声辅助大孔树脂对荆芥穗Schizonepetae Spica水提物中总黄酮和总酚类化合物进行富集并对比处理前后化合物含量及活性变化。方法 从7种不同类型树脂中筛选超声辅助最佳树脂型号,在吸附动力学和吸附热力学研究下,对超声温度、功率、上样质量浓度及解吸溶剂百分比等影响因素进行工艺优化。测定了优化处理前后各成分含量及活性变化。结果 动力学和热力学的研究表明,荆芥穗总黄酮适用于Langmuir模型,且吸附过程为自发吸热熵增,总酚则为自发放热熵减并适用于Freundlich模型,据此不同的吸附机制优化了2类成分同时富集的最佳工艺,在超声辅助AB-8大孔树脂,温度25 ℃、时间2.5 h,功率150 W,上样质量浓度0.1 g/mL,70%乙醇解吸附的过程下,荆芥穗水提物中总黄酮和总酚类化合物含量增加2～3倍,其单体成分的含量及抗氧化和神经氨酸酶抑制活性均显著增加。结论 超声辅助大孔树脂技术为荆芥穗总黄酮和总酚类成分的有效可行富集技术。     

醋酸乙烯—二乙烯基苯共聚反应动力学

根据文献查得的Ｑ,ｅ值,计算了醋酸乙烯－二乙烯基二元共聚的竞聚率,预测其共聚的可能性。以甲苯为汽油为致孔剂,采用悬浮聚合方法合成该二元大孔共聚物。红外光谱分析跟踪共聚反应过程中乙酰氧基和苯环相对比例的变化,并测定共聚反应过程中比表面积,孔率和平均孔径的变化。     

大孔吸附树脂富集茵陈蒿汤中蒿属香豆素的工艺研究

目的 研究大孔吸附树脂富集茵陈蒿汤中蒿属香豆素的工艺条件及参数。方法 以蒿属香豆素为指标，考察大孔吸附树脂富集茵陈蒿汤中蒿属香豆素的最佳工艺条件。结果提取液上大孔吸附树脂柱，吸附30min后，以5倍树脂量的蒸馏水洗去杂质，再以3～4倍树脂量的70％乙醇洗脱蒿属香豆素为最佳工艺。结论 此法可较好地富集茵陈蒿汤中的主要有效成分蒿属香豆素。     

黄芪皂苷纯化工艺研究

目的：研究黄芪皂苷类成分的纯化方法。方法：应用色谱指纹谱技术，研究比较正丁醇萃取法、大孔吸附树脂法纯化黄芪总皂苷。结果：AB-8树脂吸附纯化与正丁醇萃取纯化的黄芪总皂苷得率相近，但指纹图谱有一定差别，而其它型号的树脂吸附纯化的总皂苷得率偏低。结论：纯化黄芪总皂苷，AB-8树脂优于其它型号树脂。