排序方式: 共有27条查询结果,搜索用时 15 毫秒
1.
Vandana Singh Ashutosh TiwariDevendra Narayan Tripathi Tulika Malviya 《Tetrahedron letters》2003,44(39):7295-7297
O-Methylation is of outstanding importance in structural polysaccharide chemistry. A novel method for the methylation of polysaccharides using microwave (MW) irradiation is described. Seed gum from Cyamopsis tetragonolobus (Guar) was fully methylated with dimethyl sulphate and sodium hydroxide using 100% microwave power for 4 min in 68% yield. The completely methylated seed gum thus obtained was hydrolyzed by 70% formic acid followed by 0.5N H2SO4 under full microwave power for 1.16 and 1.66 min, respectively. The partially methylated monosaccharides were separated and identified. 相似文献
2.
R. Novina 《Chromatographia》1982,15(11):704-706
Summary A method has been developed using gas chromatography — electron impact mass spectrometry for the determination of the di-0-isopropylidene-sorbofuranose and mono-0-isopropylidene-sorbofuranose. The compounds are separated as their trimethylsilyl derivatives on a capillary column coated with the stationary phase SE-52. The mass spectra show that the silylation reaction is quantitiative and that the isopropylidene groups does not change. 相似文献
3.
Jyoti Malviya R. K. P. Singh Shashi Kala L. K. Sharma 《Russian Journal of Electrochemistry》2018,54(3):311-317
A facile and Eco-compatible synthesis of benzofuran derivatives (4a–4h) has been carried out at platinum electrode by electrochemical oxidation of catechol in the presence of active methylene groups. Electro- organic synthesis has been performed in an undivided cell at ambient conditions. The products of electrolysis have been purified and characterized by FTIR, 1H NMR and 13C NMR and mechanism was deduced by voltammetric studies. 相似文献
4.
RAPTA complexes containing N‐substituted Tetrazole scaffolds: Synthesis,characterization and Antiproliferative activity
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Poulami Mandal Novina Malviya Bidyut Kumar Kundu Sandeep Singh Dhankhar C.M. Nagaraja Suman Mukhopadhyay 《应用有机金属化学》2018,32(3)
This work describes the synthesis of a series of Ru(II)‐Arene (Arene=p‐cymene, benzene) complexes using different N‐substituted tetrazole ligands and their PTA analogues. All the complexes have been characterized thoroughly using different analytical techniques. Antiproliferative activity of the synthesized complexes against different cell lines indicates remarkable activity of certain complexes up to nanomolar level. In few cases introduction of water soluble PTA (PTA = 1,3,5‐ triaza‐7‐phospha‐tricyclo‐[3.3.1.1]decane) ligand induce significant cytotoxic activity in the ruthenium complex with respect to their chloro analogues, particularly against Jurkat and MCF‐7 cell lines. Interaction with different biomolecules and stability of the RAPTA complexes have been explored in pseudo‐pharmacological conditions. 相似文献
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A. V. Karnik N. J. Malviya A. M. Kulkarni D. Jaimini B. L. Jadhav 《Journal of heterocyclic chemistry》2006,43(2):489-493
7.
Vandana Singh Preeti Srivastava Angela Singh Devendra Singh Tulika Malviya 《高分子科学杂志,C辑:聚合物评论》2016,56(1):113-136
This article discusses and reviews the current status and future perspectives of silica hybrids of polysaccharides and biosilicas derived thereof. The hybrids have been produced in various morphological shapes and utilized in water remediation, separation, enzyme immobilization, sensor, and biomedical fields. The polysaccharides show templating and structure directing influence in manipulation of sol gel silica hybrid materials which can be calcined to derive functional biosilicas. The development of energy storage devices and white light emitting solid phosphors may be the fields of future research. 相似文献
8.
Russian Journal of Electrochemistry - A novel, convenient and economical method was developed for the anodic thiocyanation of nitrogen-containing aromatic and heteroaromatic compounds by constant... 相似文献
9.
R. Novina 《Chromatographia》1982,15(4):241-244
Summary This paper describes the gas chromatographic separation of the mixture of isopropylidene monosaccharides, and their trimethylsilyl derivatives. Based on the total analysis time and resolution the best stationary phase was SF-96 using Chromosorb G as the solid support and temperature programming. 相似文献
10.
Malviya N Srivastava M Diwakar SK Mishra SK 《Applied biochemistry and biotechnology》2011,165(2):397-405
Polyphenol oxidases (PPOs) are widely distributed enzymes among animals, plants, bacteria, and fungi. PPOs often have significant
role in many biologically essential functions including pigmentation, sclerotization, primary immune response, and host defense
mechanisms. In the present study, forty-seven full-length amino acid sequences of PPO from bacteria, fungi, and plants were
collected and subjected to multiple sequence alignment (MSA), domain identification, and phylogenetic tree construction. MSA
revealed that six histidine, two phenylalanine, two arginine, and two aspartic acid residues were highly conserved in all
the analyzed species, while a single cysteine residue was conserved in all the plant and fungal PPOs. Two major sequence clusters
were constructed by phylogenetic analysis. One cluster was of the plant origin, whereas the other one was of the fungal and
bacterial origin. Motif GGGMMGDVPTANDPIFWLHHCNVDRLWAVWQ was found in all the species of bacterial and fungus sources. In addition,
seven new motifs which were unique for their group were also identified. 相似文献