Electrophoretically driven SDS removal and protein fractionation in the shotgun analysis of membrane proteomes

SDS is mostly used to enhance the solubilization and extraction of membrane proteins due to its strong detergency and low cost. Nevertheless, SDS interferes with the subsequent procedures and needs to be removed from the samples. In this work, a special gradient gel electrophoresis (GGE) system was developed to remove SDS from the SDS-solubilized protein samples. As a proof-of-principle experiment, the GGE system was designed to be composed of an agarose loading layer, six polyacrylamide fractionation layers with different concentrations and a high-concentration polyacrylamide sealing layer. The advantages of the GGE system are that it not only can electrophoretically remove SDS efficiently so that the protein loss resulted from the repeated gel washing after electrophoresis was avoided, but also can reduce the complexity of the sample, prevent the precipitation of proteins after loading and avoid the loss of proteins with low molecular weight during the electrophoresis. Using GGE system, about 85% of SDS in the sample and gel was electrophoretically removed and the proteins were fractionated. Compared with the two representative gel-based sample cleanup methods reported in literature, GGE-based strategy significantly improved the identification efficiency of proteins in terms of the number and coverage of the identified proteins.     

Isolable chiral aggregates of achiral π-conjugated carboxylic acids

The induced aggregation of achiral building blocks by a chiral species to form chiral aggregates with memorized chirality has been observed for a number of systems. However, chiral memory in isolated aggregates of achiral building blocks remains rare. One possible reason for this discrepancy could be that not much is understood in terms of designing these chiral aggregates. Herein, we report a strategy for creating such isolable chiral aggregates from achiral building blocks that retain chiral memory after the facile physical removal of the chiral templates. This strategy was used for the isolation of chiral homoaggregates of neutral achiral π-conjugated carboxylic acids in pure aqueous solution. Under what we have termed an "interaction-substitution" mechanism, we generated chiral homoaggregates of a variety of π-conjugated carboxylic acids by using carboxymethyl cellulose (CMC) as a mediator in acidic aqueous solutions. These aggregates were subsequently isolated from the CMC templates whilst retaining their memorized supramolecular chirality. Circular dichroism (CD) spectra of the aggregates formed in the acidic CMC solution exhibited bisignated exciton-coupled signals of various signs and intensities that were maintained in the isolated pure homoaggregates of the achiral π-conjugated carboxylic acids. The memory of the supramolecular chirality in the isolated aggregates was ascribed to the substitution of COOH/COOH hydrogen-bonding interaction between the carboxylic acid groups within the aggregates for the hydrogen-bonding interactions between the COOH groups of the building blocks and the chiral templates. We expect that this "interaction-substitution" procedure will open up a new route to isolable pure chiral aggregates from achiral species.     

A novel genetically encoded fluorescent protein as a Cu(I) indicator

We constructed the copper(I)-binding domain of Mycobacterium tuberculosis (Mtb) CDC 1551 (residues 1-162) between cyan fluorescent protein (CFP) and yellow fluorescent protein (YFP), and formed a novel genetically encoded fluorescent copper(I) responsive protein (PMtb). The sensitivity and selectivity to copper(I) of the PMtb was sought. The experiments showed that the copper(I)-binding domain of the PMtb was highly sensitive and selective towards copper(I).     

Morphology-directed synthesis of Co3O4 nanotubes based on modified Kirkendall effect and its application in CH4 combustion

We reported the morphology-directed synthesis of Co(3)O(4) nanotubes via interfacial reaction of NaOH with pre-fabricated CoC(2)O(4)·2H(2)O nanorods based on modified Kirkendall effect. The as-obtained Co(3)O(4) nanotubes showed excellent activity and durability in catalytic combustion of CH(4).     

Highly efficient syntheses of azetidines, pyrrolidines, and indolines via palladium catalyzed intramolecular amination of C(sp3)-H and C(sp2)-H bonds at γ and δ positions

Efficient methods have been developed to synthesize azetidine, pyrrolidine, and indoline compounds via palladium-catalyzed intramolecular amination of C-H bonds at the γ and δ positions of picolinamide (PA) protected amine substrates. These methods feature relatively a low catalyst loading, use of inexpensive reagents, and convenient operating conditions. Their selectivities are predictable. These methods highlight the use of unactivated C-H bond, especially the C(sp(3))-H bond of methyl groups, as functional groups in organic synthesis.     

高效液相色谱法同时测定忍冬中7种成分

建立了在不同时间段内转换使用不同波长同时测定忍冬花和叶中7种化学成分(绿原酸、咖啡酸、芦丁、木犀草苷、异绿原酸A、异绿原酸B、异绿原酸C)的高效液相色谱分析方法,同时应用该方法分析了忍冬花、忍冬老叶和新叶中成分含量的差异。色谱柱为Agilent Eclipse Plus C18(250 mm×4.6 mm, 5 μm);流动相为0.3%甲酸水溶液(A)和乙腈(B),梯度洗脱,流速1 mL/min;采用VWD紫外检测器转换波长(330 nm、350 nm)检测。应用所建立的方法测定忍冬新叶中绿原酸、木犀草苷含量分别为2.572%、1.498‰,均比药典中规定的含量高,有必要进一步的研究和开发利用。该方法准确、简便、灵敏度高,适用于忍冬中7种化学成分含量的同时测定和忍冬的质量控制及综合评价。     

柱撑阴离子粘土的合成、表征及催化性能研I．ZnAl─SiW_（11）及ZnAl—SiW_（11）Z的合成

采用水热合成及离子交换方法将缺位及单取代型Ｋｅｇｇｉｎ结构钨硅杂多含氧酸根ＳｉＷ（１１）及ＳｉＷ（１１）Ｏ（３９）Ｚ（Ｈ２Ｏ）（６－）嵌入Ｚｎ─Ａｌ型阴离子粘土层间，得到了大层间距的新型层往状微孔材料ＺｎＡｌ─ＳｉＷ（１１）及ＺｎＡｌ—ＳｉＷ（１１）Ｚ（Ｚ＝Ｃｏ（２＋）、Ｎｉ（２十）和Ｃｕ（２＋）），ＸＲＤ与ＩＲ测试结果表明，它们只有９．７　的通道高度．     

强酸阳离子交换树脂催化性能的研究

通过叔丁醇脱水生成异丁烯的反应研究对比了国内外常见种类的凝胶型和大孔型强酸阳离子交换树脂的催化性能，并对树脂的性质，预处理方法，以及其用量和再生程度等因素对树脂催化活性的影响进行了研究。在此基础上，合成了具有较高催化活性的新型大孔强酸阳离子交换树脂。     

高效液相色谱法测定花生中黄曲霉毒素

本文报导了用高效液相色谱－荧光检测法测定了花生中黄曲霉毒素的方法，并做了回收验证。实验证明本法具有灵敏度高，分离能力强，测试结果准确可靠，色谱条件，ＲＰ１８柱，甲醇四氢呋喃水溶液作流动相，流速１ｍＬ／ｍｉｎ。