D-Glucosamine Hcl (66-84-2)
Chitosan (9012-76-4)
Glucosamine Sulfate Sodium Chloride
Glucosamine Sulfate Potassium Chloride
-D-Glucosamine Pentaacetate
Allyl -D-Glucopyranoside
Allyl -D-Glucopyranoside
Allyl -D-Galactopyranoside
Levoglucosan (498-07-7)
D-Arabinose (10323-20-3)
Benzyl -D-Mannopyranoside
-Chitobiose Octaacetate
-Cyclodextrin
-Cyclodextrin
2-Deoxy-D-Erythro-Pentose
2-Deoxy--D-Galactose
3,4-Di-O-Acetyl-L-Rhamnal
Isomannide
D-Fucose
L-Fucose
L-Glucose
D-Glucose
1,2-Isopropylidene--D-Glucofuranose
1,2-Isopropylidene-D-Mannitol
Lactitol Monohydrate
-Lactose Octaacetate
Lactulose Crystal
Maltose Monohydrate
-Maltose Octaacetate
Maltulose Monohydrate (17606-72-3)
D-Mannitol (69-65-8)
Methyl -D-Rhamnopranoside
Methyl -D-Fucopyranoside
Methyl -L-Fucopyranoside
Methyl -D-Galactopyranoside
Methyl -D-Ribopyranoside
Panose
-D-Galactose Pentaacetate
-D-Mannose Pentaacetate
Phenyl -D-Galactopyranoside
D-Raffinose Pentahydrate
L-Rhamnose Monohydrate
L-Ribose (24259-59-4)
D-Ribose (50-69-1)
Starch
D-Tagatose (87-81-0)
D-Talose (219-996-5)
L-Talose (23567-25-1)
D-Turanose (547-25-1)
Tri-O-acetyl-D-glucal
Spironolactone
Palatinose
D-Melezitose Monohydrate
Lactulose
D-Glucuronic acid
L-Arabitol
D-Arabitol
L-Arabinose
D-Arabinose
L-Altrose
D-Altrose
L-Allose
D-Allose
2,3,4,6-Tetra-Benzyl--D-Glucopyranose(4132-28-9)
1-Thio-b-D-Galactose Sodium
Tri-O-Acetyl-D-Galactal
2,3,4,6-Tetra-O-Benzyl--D-Galactopyranose
2,3,4,6-Tetra-O-benzyl-D-Mannopyranoside
L-Xylose
D-Xylose
 

Alpha-Cyclodextrin

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(CAS: 10016-20-3)

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CAS: 10016-20-3

Molecular Formula: C36H60O30

Molecular Weight: 972.84

Product description: Appearance:water podwer.

Product characteristic:

Purity:
>96.5%
Loss on drying:
<3.5%
Residue on ignition:
<0.1%
Heavy metal(pb):
<10ppm
Special rotation:
+150.5o
Melting point:
264.0

Cyclodextrins (CD) are crystalline, water soluble,
cyclic, non-reducing, oligosaccharides built up from six, seven, or eight
glucopyranose units.Three naturally occurring CDs are alpha cyclodextrin, beta
cyclodextrin, and gamma cyclodextrin. Among them, beta cyclodextrin is
mostly common used.Molecules of poorly soluble drugs, rapidly deteriorating flavour substances, volatile fragrances. toxic pesticides or dangerous explosives. even gases, can be encapsulated, and released just when by molecular encapsulation. The empty capsules are the molecules of the cyclodextrins.

Product use:

-CD is a kind of the cricoid low polysaccharid which produced by the amylum through the bioengineer consisted with the L dextrose.Its molecular structure is a kind of hollow cylindraceous substance, hydrophobe in the antrum of the molecular, so it is the soluble molecular with cavum. Because the characteristics,it contain the water-fast subatance to transform to soluble substance keeping the volatile things diluting slowly and stably. Increasing the stability of the substance that easily to be deteroprated under the atmosphere and the light.so It is widely used in the drugs, food and flavor,nutritional ingredients and make them stable and diluting slowly. a-CD is also widely used in the field of pesticide and adjusting the metabolization of the crop and increasing the quantity of the crop. Especially the Cyclodextrin and its ramification which developed by these years,some of them are the important solutizer,stablizer, releaser or the assist materials of the Entericcoated drugs,some of them are the materials of organic synthetical macromolecular stuff. some are used in the father of the smeary water, some are used to systhesize and separate resin,some are used to the dye industry,some are used in the chemical sensitive materials,some are used in paper making industry,some are used in seperation of the organic chemical stuff, some are used in analytical chemistry and some are used in medical plastic industry.

Usage suggestion: Incompatible with strong oxidizing agents

Reference:

References Literature Chem. Rev. 92, 1457 (1992) Aldrichimica Acta 19, 74 (1986) Merck Merck13, 2747 Beilstein Beil.19,V,12,789 Fieser Fieser9,129 reference Aldrich MSDS1, 507:C Corp MSDS1(1), 952:A FT-IR2(1), 288:A FT-IR1(1), 197:D IR-Spectra(3), 119:H IR-Spectra(2), 110:G RegBook1(1), 199:B Sigma FT-IR1(1), 1159:D Structure Index1, 27:C:7

Articles:

1. Kinetics of the self-assembly of bold alpha -cyclodextrin [2]pseudorotaxanes with polymethylene threads bearing quaternary ammonium and phosphonium end groups, for detail information click here!

Abstract: The kinetics and mechanism of the formation and dissociation of a series of [2]pseudorotaxanes, comprised of -cyclodextrin ( -CD) as the cyclic component and the ([Me3N(CH2)nNMe3]2+ (n=8-12), [Me2EtN(CH2)10NEtMe2]2+, and [Me3P(CH2)10PMe3]2+) dications as the threads, were determined by means of 1H and 31P NMR in aqueous solution. The length of the polymethylene chain (n) of the thread, which has a minor effect on the rate constant for pseudorotaxane formation, is important in the kinetics of the dissociation reactions, with the longer, more hydrophobic chains resulting in slower pseudorotaxane dissociation. The replacement of one methyl substitutent by an ethyl group in each of the end groups on the [Me3N(CH2)10NMe3]2+ thread results in a 30-fold decrease in the formation rate constant. Replacements, by ethyls, of two or all of the methyl substitutents prevent the formation of the pseudorotaxane, even after prolonged heating. The pseudorotaxane containing the {Me3P(CH2)10PMe3.; -CD}2+ thread forms only at elevated temperatures by a slippage mechanism, and the rate constant for its self-assembly at 75C (8 x 10-5 M-1 s-1) is more than 106 smaller than the rate constant at 75C (200 M-1 s-1) extrapolated for the corresponding {Me3N(CH2)10NMe3 . -CD}2+complex. The enthalpies and entropies of activation for the formation and dissociation of the [2]pseudorotaxanes decrease with an increase in the size and hydrophobicity of the end groups, suggesting a reduced role of desolvation of the quaternized atoms in the threading or dethreading processes.

2. Sliding mode of cyclodextrin in polyrotaxane and slide-ring gel, for detail information click here!

Abstract. The sliding modes of cyclic molecules in polyrotaxane and of cross-linking junctions in topological gel or slide-ring gel were investigated by quasi-elastic light scattering. We found that a polyrotaxane sparsely including -cyclodextrin showed the sliding mode in solution other than the self- and cooperative-diffusion modes whereas the sliding mode was not observed in a polyrotaxane densely including -cyclodextrin. After gelation of the sparse polyrotaxane, the self-diffusion mode of the polyrotaxane disappeared but the sliding mode was still observed. This indicated that the figure-of-eight cross-links in the slide-ring gel slid in the polymer network, passing through the polymer chains.

3. Thermodynamics of -Cyclodextrin Complexation with Bases of Nucleic Acids and Their Derivatives, for detail information click here!

The interactions of -cyclodextrin with adenine, thymine, uracil, cytosine, and caffeine in water at 298.15 K have been studied by the calorimetric method. -Cyclodextrin is found to interact selectively with nucleic bases and their derivatives to form complexes with uracil, cytosine, and caffeine only. The influence of the structure and solvation of the reactants on the thermodynamic characteristics of their complexation in a solution has been examined.