A Novel Layered Silicate with a Helical Morphology

Akiyama, Yoshikatsu; Mizukami, Fujio; Kiyozumi, Yoshimichi; Maeda, Kazuyuki; Izutsu, Hiroyuki; Sakaguchi, Kengo

doi:10.1002/(sici)1521-3773(19990517)38:10<1420::aid-anie1420>3.0.co;2-6

Cited by 37 publications

(26 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…New adsorption carriers based on principles different from those underlying conventional chromatography methods must therefore be investigated. Previously, we reported a new chromatographic carrier made up of silica, a new type of optically active organic–inorganic composite 1, 2. In the present study, we found that zeolites are much better carriers than this composite.…”

Section: Introductionsupporting

confidence: 57%

Selective Adsorption of Biopolymers on Zeolites

et al. 2001

Self Cite

View full text Add to dashboard Cite

Zeolites adsorb biopolymers on their surface and may be suitable as a new type of chromatographic carrier material for proteins, nucleic acids, and their conjugates. We report here various parameters that influence the adsorption of biopolymers on synthesized zeolites with regard to the Si/Al2 ratio and three-dimensional structure. There are three physicochemical principles that may underly the adsorption: 1) below the isoelectric point (pI), mainly Coulombic attraction similar to ion-exchange chromatography; 2) at pI, hydrophobic interactions (a kind of van der Waals attraction) plus the three-dimensional mesopore structure; and 3) above pI, the sum of the Coulombic repulsion and attraction forces, such as the hydrophobic interaction, and also substitution reaction of water on the Al molecule with a protein amino-base. At high Si/Al2 ratio in the presence of a small amount of Al and with mesopores between the zeolite particles, maximal adsorption was seen at pI and was suggested to be dependent on the number of hydrophobic interaction points on the mesopores, and their morphology. The application of zeolites to biochemistry and biotechnology is also discussed.

show abstract

Section: Introductionsupporting

confidence: 57%

Selective Adsorption of Biopolymers on Zeolites

et al. 2001

Self Cite

View full text Add to dashboard Cite

show abstract

“…15b Although those reports present the use of precursor gel containing 1,4‐dioxane for the synthesis of HLS, a novel synthetic pathway without using an organic compound is reported herein. HLS by this new method possesses a plate‐like morphology, which differs from a helical morphology reported previously15a for HLS obtained from precursor gel with organic solvent. In this report, the plate‐like HLS was used for the synthesis of AST‐type zeolite.…”

Section: Introductioncontrasting

confidence: 68%

“…Akiyama et al. reported the synthesis of HLS for the first time15a and Ikeda et al. clarified the structure 15b.…”

Section: Introductionmentioning

confidence: 99%

Topotactic Conversion of β‐Helix‐Layered Silicate into AST‐Type Zeolite through Successive Interlayer Modifications

Takayama

Shibue

Kuroda

2014

Chemistry A European J

View full text Add to dashboard Cite

AST-type zeolite with a plate morphology can be synthesized by topotactic conversion of a layered silicate (β-helix-layered silicate; HLS) by using N,N-dimethylpropionamide (DPA) to control the layer stacking of silicate layers and the subsequent interlayer condensation. Treatment of HLS twice with 1) hydrochloric acid/ethanol and 2) dimethylsulfoxide (DMSO) are needed to remove interlayer hydrated Na ions and tetramethylammonium (TMA) ions in intralayer cup-like cavities (intracavity TMA ions), both of which are introduced during the preparation of HLS. The utilization of an amide molecule is effective for the control of the stacking sequence of silicate layers. This method could be applicable to various layered silicates that cannot be topotactically converted into three-dimensional networks by simple interlayer condensation by judicious choice of amide molecules.

show abstract

“…Previously, we reported a new chromatographic carrier made up of silica, a new type of optically active organic ± inorganic composite. [1,2] In the present study, we found that zeolites are much better carriers than this composite. During the course of our experiments, the results of a few preliminary studies attempting to purify proteins by using zeolite Y appeared in the literature.…”

Section: Introductionsupporting

confidence: 58%

Selective Adsorption of Biopolymers on Zeolites

Matsui¹,

Kiyozumi²,

Yamamoto³

et al. 2001

Chem. Eur. J.

Self Cite

View full text Add to dashboard Cite

Zeolites adsorb biopolymers on their surface and may be suitable as a new type of chromatographic carrier material for proteins, nucleic acids, and their conjugates. We report here various parameters that influence the adsorption of biopolymers on synthesized zeolites with regard to the Si/Al 2 ratio and three-dimensional structure. There are three physicochemical principles that may underly the adsorption: 1) below the isoelectric point (pI), mainly Cou-lombic attraction similar to ion-exchange chromatography; 2) at pI, hydrophobic interactions (a kind of van der Waals attraction) plus the three-dimensional mesopore structure; and 3) above pI, the sum of the Coulombic repulsion and attraction forces, such as the hydrophobic interaction, and also substitution reaction of water on the Al molecule with a protein amino-base. At high Si/Al 2 ratio in the presence of a small amount of Al and with mesopores between the zeolite particles, maximal adsorption was seen at pI and was suggested to be dependent on the number of hydrophobic interaction points on the mesopores, and their morphology. The application of zeolites to biochemistry and biotechnology is also discussed.

show abstract

A Novel Layered Silicate with a Helical Morphology

Cited by 37 publications

References 5 publications

Selective Adsorption of Biopolymers on Zeolites

Selective Adsorption of Biopolymers on Zeolites

Topotactic Conversion of β‐Helix‐Layered Silicate into AST‐Type Zeolite through Successive Interlayer Modifications

Selective Adsorption of Biopolymers on Zeolites

Contact Info

Product

Resources

About