荧光素@UiO-66金属有机框架材料荧光检测曲利苯蓝

采用水热法制备了荧光素@UiO-66(FN@UiO-66)金属有机框架材料,借助X射线衍射和红外光谱技术确定了其物相结构,并利用扫描电子显微镜、动态光散射等技术表征了其形貌特征。结果表明,FN@UiO-66大小均匀,平均水合粒径为380.4 nm。随后进行了FN@UiO-66对典型染料曲利苯蓝的荧光检测研究,实验结果表明,曲利苯蓝可以猝灭FN@UiO-66的荧光发射,其Stern-Volmer系数KSV为3 593 L·mol^(-1),说明FN@UiO-66材料对曲利苯蓝具有良好的选择性,且曲利苯蓝的检出限为0.06μmol·L^(-1)。由此可见,FN@UiO-66可以高效地识别曲利苯蓝,且具有良好的选择性和检测灵敏度,可实现对曲利苯蓝的快速荧光检测。

曲利苯蓝掺杂石墨烯/聚吡咯复合气凝胶的制备与电化学性能

将具有独特掺杂结构的聚吡咯(PPy)与丰富多孔结构的石墨烯(GE)气凝胶复合,可实现两种材料优势互补。通过一步水热法制备了曲利苯蓝(TB)掺杂GE/PPy复合气凝胶,采用SEM、FTIR、XRD、Raman和XPS对复合材料的形貌、化学结构、掺杂结构进行表征。结果表明,TB掺杂PPy/GE复合气凝胶呈现出三维多孔网络结构,复合气凝胶中氧化石墨烯(GO)被还原的同时,导电PPy被成功聚合,TB的引入有利于复合气凝胶掺杂水平的提高。电化学测试分析表明,TB掺杂浓度达到5 mmol·L^(−1)时,复合气凝胶(TB-5/PPy-GO)可获得最高比电容(392 F·g^(−1)),10000次充/放电循环后,比电容保持率可达85%;将TB-5/PPy-GO、活性炭分别作为正、负极组装为非对称超级电容器,其在功率密度为400 W·kg^(−1)时,能量密度高达35.89 W·h·kg^(−1),表现出良好的超电容特性。

二氧化钛光催化降解蓝色染料的动力学研究

本文选择两种蓝色有机染料——曲利苯蓝与考马斯亮蓝R250为研究对象,使用二氧化钛为催化剂,研究了它们在254nm紫外光下降解的影响因素以及相应的动力学模型。实验结果显示,随着二氧化钛投加量的增加以及反应时间的延长,曲利苯蓝与考马斯亮蓝R250的脱色率均随之升高;而增大曲利苯蓝与考马斯亮蓝R250的起始浓度,它们的脱色率则随之下降。此外,溶液p H也对对于这两种染料的降解存在一些影响。在二氧化钛的催化下,曲利苯蓝与考马斯亮蓝R250的降解均符合准一级Langmuir-Hinshelwood方程。

UPLC-ESI-QTOF-MS技术分析苤蓝中的化学成分

采用超高效液相色谱(UPLC)技术,使用C18(2.1×100 mm,1.8μm)色谱柱,用不同比例的乙腈-0.1%甲酸水溶液做流动相梯度洗脱,对苤蓝甲醇提取物的正丁醇萃取相进行分离。以电喷雾电离源负离子模式对色谱流出物进行离子化,飞行时间串联质谱(QTOF-MS)对主要色谱峰进行归属。通过综合分析色谱数据、一级和二级全扫描质谱数据,对苤蓝中的化学成分进行分析鉴定。共从中鉴定出了包括苷类、香豆素类、萜类、生物碱类、有机酸及氨基酸类等在内的19个化合物。苤蓝中化学成分的鉴定,对于后续苤蓝中活性物质的分离及其系统研究可提供有用的参考。

一种鉴定多糖水解酶类及其产生菌的新方法

利用曲里苯蓝能与多糖形成复合物的原理，建立起一种简便、快捷、灵敏的筛选多糖水解酶类及其产生菌的平板鉴定方法。曲里苯蓝对供试微生物无毒害作用，不影响酶的活性，并可高温灭菌。其最适浓度在0．005％～0．01％（W／V）之间。可用于纤维素水解酶类、淀粉水解酶类、甘露聚糖酶、普鲁兰酶等多糖水解酶，与传统方法相比，该方法不仅有着同样高的灵敏度，而且能够提高筛选效率，避免污染问题，同时适合于多种多糖底物。但不能用于木聚糖酶和菊粉酶的检测。

一种筛选纤维素酶产生菌的改良方法

该文利用曲里苯蓝(Trypan blue)能与多糖形成复合物的原理,建立起一种简便、快捷筛选纤维素酶产生菌的改良方法。实验以羧甲基纤维素钠作为底物,配制0.02%曲里苯蓝培养基培养纤维素酶产生菌株,检测菌落周围形成的透明水解圈,水解圈的大小同酶活高低有一定指数关系。该方法与传统方法相比,不仅有着同样高的灵敏度,而且不影响菌株生长,可以应用于纤维素酶改良工程菌株的筛选。

有机药物中残留三氟醋酸测定方法的研究

目的 :检查有机药物中残留的溶剂三氟醋酸。方法 :将药物进行氧瓶燃烧破坏后 ,用茜素氟蓝比色法测定氟 ,再换算成三氟醋酸的量。结果 :检测限为 4.6 μg的三氟醋酸 ,线性范围为 5～ 30 μg氟 (r=0 .9990 ) .结论 :该检查方法较简便 ,灵敏 。

Determination of Ciprofloxacin Lactate by Sodium Tetraphenylboron Method

This paper describes an effective method for determining ciprofloxacin lactate. An excess of sodium tetraphenylboron was added to precipitate ciprofloxacin lactate in HAc-NaAc buffer solution (pH=4.0). After filtering off the precipitate, the excessive sodium tetraphenylboron in the filtrate was titrated with cetyltrimethylammonium bromide standard solution, with bromophenol blue as indicator. The method is simple and rapid, it has been applied to the determination of ciprofloxacin lactate raw material with satisfactory results. The recovery was between 99.66% and 100.2%, the relative error was less than ±0.40%. Experiments showed that the method gave the same results as the approach using nonaqueous titration (ChP).

Moxibustion activates mast cell degranulation at the ST25 in rats with colitis

AIM: To investigate the effects of moxibustion on the morphology and function of mast cells (MC) at Tianshu (ST25) in rats with trinitro-benzene-sulfonic acid (TNBS)-induced colitis. METHODS: A total of 53 male Sprague-Dawley rats were randomly divided into a normal group and experimental group. In the experimental group, a rat model of TNBS-induced colitis was established, and the rats were then randomly divided into a model group, moxi-bustion group, moxibustion plus disodium cromoglycate (M + DC) group and moxibustion plus normal saline (M+ NS) group. Rats in the moxibustion group received suspended moxibustion at bilateral ST25 for 10 min, once a day for 7 d. Rats in the M + DC and M + NS groups were pretreated with disodium cromoglycate and normal saline at bilateral ST25, respectively, and were then concurrently subjected to the same treatment as rats in the moxibustion group. The hematoxy- lin-eosin staining method was used to observe histology of the colon and the toluidine blue-improved method was used to observe mast cells at ST25 acupoint areas. RESULTS: An improvement in colonic injury in the moxibustion group was observed and the degranulation ratio of MC at ST25 acupoint was markedly higher in the moxibustion group than in the model group (45.91 ± 11.41 vs 32.58 ± 8.28, P < 0.05). After inhibition of degranulation of MC at ST25 by disodium cromoglycate, no improvement in colon tissue injury was observed. CONCLUSION: Moxibustion exerted its effect on healing impaired colonic mucosa in rats with TNBS-induced colitis by increasing the degranulation ratio of local MC, but had little effect on the morphology of MC at ST25 acupoint.

CARTILAGE- LIKE PHENOMENON IN THE ANTERIOR CRUCIATE LIGAMENT

Objective. To detect histological characteristic of anterior cruciate ligament (ACL) and medial collateral ligament (MCL). Methods. In each of 20 skeletally mature male mongrels and 4 men, the ACL and MCL were examined by standard hematoxylin- eosin procedure and toluidine blue staining for histologic observation. Results. The fibroblasts in medial collateral are elongated to spindle shape and aligned in a row between the bundles of collagenous fibers. Toluidine blue staining is negative. The anterior cruciate ligament demonstrated more heterogenous cell types and arrangement. It had three major cell forms:spindle, round and ovoid type, which were shorter but greater than the cells in medial collateral ligament. Toluidine blue staining was positive in anterior cruciate ligament. Most cells in anterior cruciate ligament were enclosed within lacunae. Conclusion. This study suggests that the ACL has different histological characteristics from MCL, and is more cartilage- like in nature.

Change of 3 Kinds of Enzyme Activity and Soluble Sugar in 3 Chinese Cabbage Varieties with Different Resistance Level During the Process of Plasmodiophora brassicae Infecting Their Roots

There are different levels of resistance in Chinese cabbage varieties against clubroot.The content of catalase(CAT),peroxidase(POD),phenylalanin ammonia-lyase(PAL),Super Oxide Dismutase(SOD)and soluble sugar activities of 3cultivars with different clubroot-resistant levelswere detected after inoculation in this study.The results suggest that the changing rates of CAT,PAL and SOD contents of resistance cultivars after inoculation were higher than those of susceptible cultivars(Baigengbaiye>Zaobaicaitai>Huangjinxiaobaicai);the POD activities of resistance cultivars reached a peak on an earlier day than those of susceptible cultivars;the increasing rate of soluble sugar of susceptible cultivars was higher than that of the resistance cultivars,and ended with two peaks.Therefore,the four enzymes(CAT,POD,PAL and SOD)and soluble sugar may be used as physiological and biochemical reference indexes for the resistance identification to clubroot after inoculation with P.brassicae.

Distribution and characteristics of telocytes as nurse cells in the architectural organization of engineered heart tissues

Interstitial Cajal-like cells are a distinct type of interstitial cell with a wide distribution in mammalian organs and tissues,and have been given the name"telocytes".Recent studies have demonstrated the potential roles of telocytes in heart development,renewal,and repair.However,further research on the functions of telocytes is limited by the complicated in vivo environment.This study was designed to construct engineered heart tissue(EHT)as a three-dimensional model in vitro to better understand the role of telocytes in the architectural organization of the myocardium.EHTs were constructed by seeding neonatal cardiomyocytes in collagen/Matrigel scaffolds followed by culture under persistent static stretch.Telocytes in EHTs were identified by histology,toluidine blue staining,immunofluorescence,and transmission electron microscopy.The results from histology and toluidine blue staining demonstrated widespread putative telocytes with compact toluidine blue-stained nuclei,which were located around cardiomyocytes.Prolongations from the cell bodies showed a characteristic dichotomous branching pattern and formed networks in EHTs.Immunofluorescence revealed positive staining of telocytes for CD34 and vimentin with typical moniliform prolongations.A series of electron microscopy images further showed that typical telocytes embraced the cardiomyocytes with their long prolongations and exhibited a marked appearance of nursing cardiomyocytes during the construction of EHTs.This finding highlights the great importance of telocytes in the architectural organization of EHTs.It also suggests that EHT is an appropriate physical and pathological model system in vitro to study the roles of telocytes during heart development and regeneration.

Silafluorene moieties as promising building blocks for constructing wide-energy-gap host materials of blue phosphorescent organic light-emitting devices

In this article, we reported the synthesis and characterization of a novel silafluorene-based host material, 1,3-bis（5-methyl-5H- dibenzo[b,d]silol-5-yl）benzene （Me-DBSiB）, for blue phosphorescent organic light-emitting devices （PHOLEDs）. The Me- DBSiB was constructed by linking 9-methyl-9-silafluorene units to the phenyl framework through the sp3-hybridized silica atom to maintain high singlet and triplet energy, as well as to enhance thermal and photo-stability. The calculated result shows that the phenyl core does not contribute to both the highest occupied molecular orbital and lowest unoccupied molecular orbital. Wide optical energy gap of 4.1 eV was achieved. When the Me-DBSiB was used as the host and iridium （Ⅲ） bis[（4,6-difluorophenyl）pyridinato-N,C2＇]picolate （Firpic） as the guest, a maximum current efficiency was 14.8 cd/A, lower than the counterpart of 1,3-bis（9-carbazolyl）benzene （28 cd/A）. The unbalanced barrier for electron and hole injection to host layer may be responsible for low efficiency. Even so, our results show that silafluorene moieties are promising building blocks for constructing wide-energy-gap host materials.

Pure aromatic hydrocarbons with meta-linked phenyl-core and perihedral fluorene substitutions with/without inert groups of tert-butyl： bipolar hosts for blue phosphorescence

Two pure hydrocarbon molecules of l,3,5-tris(9-phenyl-9H-fluoren-9-yl)benzene(mTPFB)and l,3,5-tris(2-tert-butyl-9-phenyl-9H-fluoren-9-yl)benzene(tBu-mTPFB)were synthesized.Due to the conjugation blocked connection mode and rigid/bulky substitutions,these two materials possess high triplet energy,enabling them as good hosts for blue phosphor in PhOLEDs.By studying their thermal,electrochemical,electronic absorption and photoluminescent properties,it was found that the influence of the inert tert-butyl group on material photoelectrical properties is negligible.For instance,mTPFB and tBu-mTPFB showed very similar absorption and emission profiles,with almost the same bandgap,triplet energy and energy levels.However,the encapsulation of tert-butyl on the 2-position of 9-phenylfluorene enhanced material thermal stability.Most importantly,carrier transport properties were improved dramatically,as proved by the mono carrier device.Blue phosphorescent OLEDs hosted by tBu-mTPFB showed external quantum efficiency of 15.2%and current efficiency of 23.0 cd/A,which were much higher than that of the OLEDs based on mTPFB with the analogous structure.