Selective SERS Detecting of Hydrophobic Microorganisms by Tricomponent Nanohybrids of Silver–Silicate-Platelet–Surfactant

2014 ◽  
Vol 6 (3) ◽  
pp. 1541-1549 ◽  
Author(s):  
Jun-Ying Ho ◽  
Ting-Yu Liu ◽  
Jiun-Chiou Wei ◽  
Juen-Kai Wang ◽  
Yuh-Lin Wang ◽  
...  
Keyword(s):  
Silver Silicate

Silver Silicate@Carbon Nanotube Nanocomposites for Enhanced Visible Light Photodegradation Performance

2017 ◽  
Vol 5 (5) ◽  
pp. 3641-3649 ◽  
Author(s):  
Ya-Qiong Jing ◽  
Chen-Xi Gui ◽  
Jin Qu ◽  
Shu-Meng Hao ◽  
Qian-Qian Wang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Visible Light ◽  
Silver Silicate

Glucosylation of 5-androsten-3β-ol derivatives containing butenolide, furan or unsaturated ester moieties in the side chain

1984 ◽  
Vol 49 (4) ◽  
pp. 881-891 ◽  
Author(s):  
Ivan Černý ◽  
Vladimír Pouzar ◽  
Pavel Drašar ◽  
Miloš Buděšínský ◽  
Miroslav Havel
Keyword(s):  
Sodium Borohydride ◽  
Lactone Ring ◽  
Acetyl Derivative ◽  
Side Chain ◽  
Unsaturated Ester ◽  
Reaction Sequence ◽  
Silver Silicate

3-O-(Tetra-O-acetyl-β-D-glucopyranosyl) derivatives II, V, XV and XX were prepared from 5-androstene-3β,17β-diol 17-benzoate (I), (20R)-3β-hydroxy-21-nor-5,22-choladien-(24 -20)-olide (IV), 17β-(2-furyl)-5-androsten-3β-ol (XIV) and methyl (20E)-3β-hydroxy-5,20-pregnadiene-21-carboxylate (XIX), respectively, using tetra-O-acetyl-α-D-glucopyranosyl bromide and silver silicate. The furyl derivative XIV was obtained from methyl 3β-methoxymethyletienate VIII by reaction sequence in which the key reactions were alkylation of the keto sulfoxide IX with bromoacetate, cyclization of the obtained product with sodium borohydride and reduction of the mixture of lactones XI and XII with diisobutylaluminium hydride. The unsaturated ester XIX was prepared from 3β-acetoxy-5-androstene-17β-carbaldehyde (XVII) by treatment with diethyl methoxycarbonylmethylphosphonate and deacetylation of the formed acetyl derivative XVIII. Deacetylation of the acetyl derivatives II, XV and XX afforded the glucosides III,XVI and XXI, respectively; the deacetylation of V was accompanied by opening of the lactone ring under formation of the methyl 21-nor-20-oxo-5-cholen-24-oate derivative VI.

Glucosylation of Some Steroidal 17-Hydroxy Derivatives

1992 ◽  
Vol 57 (2) ◽  
pp. 362-374 ◽  
Author(s):  
Ivan Černý ◽  
Vladimír Pouzar ◽  
Pavel Drašar ◽  
Miroslav Havel
Keyword(s):  
Protecting Groups ◽  
Estradiol Derivatives ◽  
Silver Silicate

Eight 17-monoglucosides derived from androst-5-ene-3,17-diol, 14β-androst-5-ene-3,17-diol, 5β-androstane-3,17-diol and estradiol derivatives differing in configuration in the positions 17 and 3, have been prepared. The silver silicate - catalyzed glycosylation with 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide gave 43-72% of the corresponding peracetylated β-D-glucopyranosides. The starting selectively protected 5β-androstane-3,17-diol derivatives were synthesized by a procedure utilizing orthogonality of the pivalate, acetate and nitrate protecting groups.

Preparation of 3-(6-Deoxy-β-D-glucopyranosyloxy) and 3-(6-Deoxy-α-L-mannopyranosyloxy)androstane Derivatives with Unsaturated Side Chain in Position 17β

1993 ◽  
Vol 58 (12) ◽  
pp. 3000-3008 ◽  
Author(s):  
Hana Chodounská ◽  
Vladimír Pouzar
Keyword(s):  
Side Chain ◽  
Unsaturated Ester ◽  
Silver Silicate ◽  
Derivatives Of ◽  
Androstane Derivatives ◽  
Steroidal Derivatives ◽  
Ester Chain

In our previous papers we described the preparation of 3-β-D-glucopyranosyloxy) and 3-β-D-galactopyranosyloxy) derivatives of steroids with an α,β-unsaturated ester chain in position 17β of androstane skeleton. In conection with this project we have studied silver silicate promoted glycosylation of some of above mentioned steroidal derivatives with 2,3,4-tri-O-acetyl-6-deoxy-α-D-glucopyranosyl bromide and 2,3,4-tri-O-acetyl-6-deoxy-α-L-mannopyranosyl bromide.

Solid-state NMR and XANES studies of lithium and silver silicate gels synthesized by the sol–gel route

2003 ◽  
Vol 318 (3) ◽  
pp. 296-304 ◽  
Author(s):  
A.A. Mrse ◽  
P.L. Bryant ◽  
F.J. Hormes ◽  
L.G. Butler ◽  
N. Satyanarayana ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Sol Gel ◽  
Silver Silicate

β-Glucosides of steroidal unsaturated nitriles

1987 ◽  
Vol 52 (10) ◽  
pp. 2521-2533 ◽  
Author(s):  
Ivan Černý ◽  
Vladimír Pouzar ◽  
Pavel Drašar ◽  
Miroslav Havel
Keyword(s):  
Double Bond ◽  
Reaction Pathway ◽  
Trimethylsilyl Derivative ◽  
Protecting Group ◽  
Subsequent Removal ◽  
Tetrabutylammonium Fluoride ◽  
Silver Silicate ◽  
Parallel Series

Reaction of 3β-methoxymethoxy-5-pregnen-20-one (Ia) with diethyl cyanomethylphosphonate and subsequent removal of the protecting group afforded (20E)-3β-hydroxy-24-norchola-5,20(22)-diene-23-nitrile (IIIa). Besides the analogous derivative IIIb with another double bond in position 14, the fully saturated compounds IIIc and IIId with configuration 5α and 5β, respectively, were prepared similarly. Silver silicate-catalyzed glycosylation of IIIa-IIId with tetra-O-acetyl-α-D-glucopyranosyl bromide gave β-D-glucopyranosides IVa-IVd in 77-89% yield. A parallel series of hemisuccinates VIa-VId was prepared in 64-81% yields by reaction of IIIa-IIId with 2-(trimethylsilyl)ethyl hydrogen butanedioate followed by deblocking with tetrabutylammonium fluoride. The glucoside IVa was prepared also by an alternative reaction pathway starting from 3β-hydroxy-5-pregnen-20-one (VIII). Compound VIII was converted in 80% yield into the glucoside IX which, after protection as the tetra-O-(trimethylsilyl)derivative XII, was treated with diethyl cyanomethylphosphonate.

Mutually reactive elements in a glass host matrix: Ag and S ion implantation in silica

1999 ◽  
Vol 14 (6) ◽  
pp. 2449-2457 ◽  
Author(s):  
R. Bertoncello ◽  
S. Gross ◽  
F. Trivillin ◽  
E. Cattaruzza ◽  
G. Mattei ◽  
...  
Keyword(s):  
Room Temperature ◽  
Silver Oxide ◽  
Chemical Interaction ◽  
Silica Matrix ◽  
Reactive Elements ◽  
Host Matrix ◽  
Sulfur Lead ◽  
Projected Range ◽  
Crystalline Core ◽  
Silver Silicate

Ag, S, Ag + S, and S + Ag single and double ion implantations in silica glass were performed at room temperature. The implantation energies were chosen in order to get a projected range of 40 nm. The fluences were 2 × 1016 S+ cm−2 and 5 × 1016 Ag+ cm−2. Silver interacts weakly with the host silica matrix and forms essentially metallic clusters; this weak interaction between Ag and SiO2 induces formation of silver silicate rather than silver oxide. Double ion implantations of silver and sulfur lead to chemical interaction between the two species that is critically influenced by the implantation sequence. In particular, in the Ag + S sample silver and sulfur atoms react to form crystalline core (Ag)–shell (Ag2S) nanoclusters.

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