排序方式: 共有12条查询结果,搜索用时 15 毫秒
1.
This paper is devoted to analysis of oil treatment technology in the case of complex industrial process realization and further selection of technological mode. Mathematical modelling method is used to improve the efficiency of dewatering and desalting processes. The simulation system based on module modelling principle is developed. Every module is described in terms of appropriate combination of phenomena and processes. Problems of oil treatment analysis of complex structured technological scheme and searching of effective dewatering and desalting processes technological modes are solved. 相似文献
2.
Ilaria Bonaduce Marcello CitoMaria Perla Colombini 《Journal of chromatography. A》2009,1216(32):5931-5939
This paper presents a GC–MS analytical procedure for determining proteinaceous materials, glycerolipids, natural waxes and terpenoid resins in the same paint micro-sample. The procedure is also reliable when high amounts of interfering inorganic pigments, dryers and charges are present. The characterisation of proteinaceous binders in a paint sample can be subject to analytical interferences by inorganic materials. Such materials may form complexes with functional groups of proteins, thus preventing their efficient derivatisation, which is necessary prior to GC analysis. For this reason an analytical procedure has been developed based on two extractions and a clean-up step, in order to obtain two fractions: a lipid-resinous fraction and a proteinaceous fraction. The lipid-resinous fraction is subjected to salification/saponification assisted by microwaves, followed by acidification, extraction, derivatisation and GC–MS analysis. The proteinaceous fraction is analysed by GC–MS after hydrolysis and derivatisation of the freed amino acids. The desalting step is applied before the hydrolysis, and is based on the use of the monolithic sorbent tip technology with a C4 stationary phase. Reference paint replicas of egg, casein and animal glue were prepared with and without several metals containing pigments, and used to develop and validate the analytical procedure. The procedure proved to be efficient in desalting the proteinaceous materials both from cations and anions. Although non quantitative, it is reliable in the analysis of samples whose content of extractable proteins is <1 μg, thus showing it to be suitable for the characterisation of paint samples. An example of how the analytical procedure was used to characterise a sample from a 15th century panel painting is also discussed. 相似文献
3.
Sample preparation still remains a great challenge in modern bioanalysis and the interest in new efficient solid phase extraction (SPE) materials still remains high. In this work, hexagonal boron nitride (h-BN) is introduced as a new SPE material for the isolation and enrichment of peptides. The h-BN is isoelectronic and structurally similar to graphite. It has remarkable properties including good thermal conductivity, excellent thermal and chemical stability and a better oxidation resistance than graphite. BN attracts increasing interest because of its wide range of applicability. In the present work, the great potential of h-BN, as a new SPE-material, on the enrichment, preconcentration and desalting of tryptic digest of model proteins is demonstrated. A special attention was dedicated to the efficient enrichment of hydrophilic phosphopeptides. Two elution protocols were developed for the enrichment of peptides compatible for subsequent MALDI-MS and ESI-MS analysis. In addition, the recoveries of 5 peptides and 3 phosphopeptides with wide range of pI values utilizing h-BN materials with different surface areas were investigated. 84–106% recovery rate could be achieved using h-BN materials. The results were compared with those obtained using graphite and silica C18 under the same elution conditions, and lower recoveries were obtained. In addition, h-BN was found to have a capability of protein depletion, which is requisite for the peptide profiling. 相似文献
4.
Dilshad Hussain Muhammad Najam-ul-Haq Fahmida Jabeen Muhammad N. Ashiq Muhammad Athar Matthias Rainer Christian W. Huck Guenther K. Bonn 《Analytica chimica acta》2013
Diamond is known for its high affinity and biocompatibility towards biomolecules and is used exclusively in separation sciences and life science research. In present study, diamond nanopowder is derivatized as Immobilized Metal Ion Affinity Chromatographic (IMAC) material for the phosphopeptides enrichment and as Reversed Phase (C-18) media for the desalting of complex mixtures and human serum profiling through MALDI-TOF-MS. Functionalized diamond nanopowder is characterized by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. Diamond-IMAC is applied to the standard protein (β-casein), spiked human serum, egg yolk and non-fat milk for the phosphopeptides enrichment. Results show the selectivity of synthesized IMAC-diamond immobilized with Fe3+ and La3+ ions. To comprehend the elaborated use, diamond-IMAC is also applied to the serum samples from gall bladder carcinoma for the potential biomarkers. Database search is carried out by the Mascot program (www.matrixscience.com) for the assignment of phosphorylation sites. Diamond nanopowder is thus a separation media with multifunctional use and can be applied to cancer protein profiling for the diagnosis and biomarker identification. 相似文献
5.
A new clean fast (8 min) method for in-solution protein digestion without detergent or urea for protein identification by peptide mass fingerprint and mass spectrometry-based techniques is proposed. The new method avoids the use of time consuming desalting procedures entailing the following four steps done under the effect of an ultrasonic field provided by a sonoreactor: denaturation (1 min) in a mixed solution of water:acetonitrile 1/1 (v/v); protein reduction (1 min); protein alkylation (1 min); and protein digestion (5 min). Five proteins with masses comprised between 14.4 kDa and 97 kDa and the protein split-soret cytochrome c from D. desulfuricans ATCC27774, were successfully identified with this procedure. No differences were found in the sequence coverage or in the number of peptides matched when the new clean method was compared to another one using urea. Twofold better signal-to-noise ratios were obtained in the MALDI spectra from protein samples prepared with the new method when comparing it with a method using urea. The new digestion method avoids the need to remove salt content and increases throughput (six samples at once) while reducing sample loss and contamination from sample handling. 相似文献
6.
Summary The uptake of sodium chloride, leucine and phenylalanine by a strong cation-exchange resin in the sodium form have been compared.
Sodium chloride was excluded from the resin, as indicated by its parabolic upwards curved isotherm, and the corresponding
desorption edge was sharpened (constant pattern). Isotherms for both amino acids constructed from a single elution experiment
displayed slightly downwards curvature; the corresponding desorption edges spread in contrast to the breakthrough ones. The
affinities of both amino acids for the resin were higher (from 15 to 40 %) in the presence of 1 M sodium chloride, indicating
that hydrophobic interactions played a significant role in the mechanism of sorption.
As expected from the isotherms, a mixture of 1 M sodium chloride, leucine and phenylalanine was separated with satisfactory
recovery of both amino acids for a column loading of 10 % of the bed volume. Real mother liquors have also been separated
under the same conditions. 相似文献
7.
Jan-Christer Janson 《Chromatographia》1987,23(5):361-365
Summary The creative and stimulating atmosphere in the laboratories of The Svedberg and Arne Tiselius in the Departments of Physical
Chemistry and Biochemistry of Uppsala University during the 1930's, 1940's and 1950's, was a nursery for a remarkable set
of both academic and industrial advances. Their pupils were to become distinguished professors at Swedish Universities, as
well as abroad, and they were directly involved in the development of two successful Swedish industries, LKB-produkter AB
in Stockholm and Pharmacia AB in Uppsala. This review describes the preconditions and the events which led to the development
of one of the first commercially available biochemical separation products, the gel filtration medium Sephadex which was introduced
by Pharmacia AB in 1959. All the necessary components of a successful transfer of academic research to industrial product
development were at hand: a scientific culture of common origin and a longstanding tradition in methodological research; mutual
understanding and respect combined with informal links not only between the scientists involved but also between the president
of the company and the university authorities. So far, 49 products (excluding those intended for use in health care and diagnostics)
have been developed based on the epichlorohydrin cross-linked dextran gel Sephadex.
This review is dedicated to my teacher professor Jerker Porath on his retirement as Jacobsonian Professor of Biochemistry
at Uppsala University in December 1987. 相似文献
8.
水中二氧化碳含量对弱碱性阴树脂工作交换容量影响的研究 总被引:1,自引:0,他引:1
弱碱性阴树脂用于水的除盐处理时,其工作交换容量的大小与许多因素有关。本文主要就进水中CO2含量对弱碱阴树脂工作交换容量的影响进行了研究,得出了弱碱性阴树脂工作交换容量受水中CO2含量影响的一般规律,这为弱碱性阴树脂的应用提供了依据。 相似文献
9.
J. A. Poquis V. García-García J. Gonzlez-García V. Montiel A. Aldaz 《Journal of membrane science》2000,170(2)
In the industrial synthesis of
-α-p-hydroxyphenylglycine the separation of amino acid is carried out by precipitation. During this process, a mother liquor is produced with a high salt content (2 M phosphates and sulphates) and an amino acid concentration of 0.11–0.12 M. The disposal of this mother liquor causes an environmental problem and an economic loss. The salt content of this mother liquor can be reduced in 70% of the initial by means of an electrodialysis process previously carried out by us, with only an amino acid loss of 15% of the initial. To improve and simplify this process, an electro-electrodialysis process (a membrane electrolysis process; the electrode processes and the transport process across the membrane are used) has been developed in which as a first step, the electro-neutralisation of solutions containing sulphuric acid and
-α-p-hydroxyphenylglycine is studied. The sulphuric acid content is reduced to 87% of the initial, without detected loss of amino acid. The final solution is posteriorly neutralised by working up the pH of the solution for precipitating the amino acid, and a mother liquor with approximately 0.10 M
-α-p-hydroxyphenylglycine and a low salt content (0.08 M Na2SO4) is produced. This mother liquor with low salinity can be recirculated again to a new electro-electrodialysis process. 相似文献
10.
Shi Zheng Xiaoli WangJieying Fu Xuejiao HuXiao Xiao Lulu HuangYoue Zhou Hongying Zhong 《Analytica chimica acta》2012
Desalting and concentration of peptides using reverse phase (RP) C18 chromatographic material based on hydrophobic interaction is a routine approach used in mass spectrometry (MS)-based proteomics. However, MS detection of small hydrophilic peptides, in particular, phosphopeptides that bear multiple negative charges, is challenging due to the insufficient binding to C18 stationary phase. We described here the development of a new desalting method that takes the unique properties of polypyrrole (PPY). The presence of positively charged nitrogen atoms under acidic conditions and polyunsaturated bonds in polypyrrole provide a prospect for enhanced adsorption of phosphopeptides or hydrophilic peptides through extra electrostatic and Π–Π stacking interactions in addition to hydrophobic interactions. In tandem with reversed phase C18 chromatographic material, the new type of desalting method termed as TMTipPPY-C18 can significantly improve the MS detection of phosphopeptides with multiple phosphate groups and other small hydrophilic peptides. It has been applied to not only tryptic digest of model proteins but also the analysis of complex lysates of zebrafish eggs. The number of detected phosphate groups on a peptide ranged from 1 to 6. Particularly, polypyrrole based method can also be used in basic condition. Thus it provides a useful means to handle peptides that may not be detectable in acidic condition. It can be envisioned that the TMTipPPY-C18 should be able to facilitate the exploration of large scale phosphoproteome. 相似文献