Effect of Randomly Methylated β-Cyclodextrin on Physical Properties of Soils

Józefaciuk, Grzegorz; Murányi, Attila; Fenyvesi, Éva

doi:10.1021/es026236f

Cited by 29 publications

(19 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their findings suggested that the surface properties and pore structure of minerals changed dramatically when CyDs were introduced, leading to a decrease in surface area, an increase in adsorption energy, and decreases in the volumes of micro and mesopores. These authors also observed a great modification of physical properties in some selected soils after RAMEB addition, such as increasing water adsorption and surface area in sandy soils and their decreasing in clay soils, and an increasing proportion of coarse-size soil fractions owing to aggregation of smaller particles [49]. However, it has not been determined if certain surface and pore properties return to the original state after the removal of the CyD, either by leaching or by biodegradation, or if the phenomena observed for RAMEB are generally true for other CyDs.…”

mentioning

confidence: 87%

Cyclodextrins and Their Complexes

Dodziuk¹

2006

412

View full text Add to dashboard Cite

The ability of cyclodextrins, CyDs, to form inclusion complexes with a wide variety of hydrophobic guest molecules has been used in agriculture. Their ability to alter the physical, chemical, and biological properties of guest molecules has been used for the preparation of new formulations of pesticides. CyDs form complexes with a wide variety of agricultural chemicals including herbicides, insecticides, fungicides, repellents, pheromones, and growth regulators [1,2].Each CyD has its own ability to form inclusion complexes with specific pesticides, depending on a proper fit of the pesticide molecule into the hydrophobic CyD cavity. The principal advantage is that the binding of pesticide molecules within the host molecule is not fixed or permanent but rather is a dynamic equilibrium. Dissociation of the inclusion complex is a relatively rapid process usually driven by a large increase in the number of water molecules in the surrounding environment [3]. aAQ16.3.1aSimilarly to CyD applications in the pharmaceutical (Chapters 14 and 15) and other industries, the most common benefits of CyD applications in agriculture include, among others, alterations of the solubility of the pesticide, stabilization against the effects of light or biochemical degradation, and a reduction of volatility. In some applications, more than one benefit is obtained by complexation with CyDs. However, the application of these hosts in pesticide formulations is very modest, and represents less than 1% of the CyD literature [4]. Moreover, most of these publications are not directly practice oriented. Instead they deal with the preparation of pesticides@CyD complexes using different oligosaccharides and processing methods and their characterization using a wide variety of techniques.Among these papers, some are more or less theoretical papers dealing with the correlation between the properties of the new complexes obtained and the properties of the CyDs, pesticides, or external parameters used. Viernstein et al.

show abstract

mentioning

confidence: 87%

Cyclodextrins and Their Complexes

Dodziuk¹

2006

412

View full text Add to dashboard Cite

show abstract

“…Cyclodextrins are known for their affinity to complex with a wide range of chemical compounds, including heavy metals and organic pollutants (Cathum et al, 2005;Chatain et al, 2004;Jozefaciuk et al, 2003;Morillo et al, 2001;Tick et al, 2003;Villaverde et al, 2005aVillaverde et al, , 2005b. Like the free cyclodextrin, the cyclodextrin-based material contains molecular cavities and can include nonpolar molecules, such as PCBs, and polar chemicals, such as free ions of heavy metals.…”

Section: Exhibit 4 Particles Of Cyclodextrin-based Materials Under Thmentioning

confidence: 99%

“…There is growing interest in the use of cyclodextrins (CDs) for the cleanup of organic and inorganic pollutants in soils, sediment, and groundwater (Cathum et al, 2005;Chatain et al, 2004;Jozefaciuk et al, 2003;Morillo et al 2001;Tick et al, 2003;Villaverde et al, 2005aVillaverde et al, , 2005b. Cyclodextrins are polysaccharides produced from hydrolyzed starch that uses the external enzyme cyclodextrin glucanotransferase.…”

Section: Introductionmentioning

confidence: 99%

Treatment of mixed contamination in water using cyclodextrin-based materials

Cathum¹,

Boudreau²,

Obenauf³

et al. 2006

Remediation

View full text Add to dashboard Cite

This study investigated the effectiveness of a cyclodextrin-based solid material for the removal of mixed dissolved contaminants. The solid material was prepared by condensation of ␣-cyclodextrin. The removal efficiency was found to be 70 percent for total heavy metals (cadmium, lead, chromium, iron, nickel, cobalt, and mercury) to 98 percent for polychlorinated biphenyls (PCBs).The optimum pH for heavy metal removal was approximately 5 and for PCBs it was in the range of 5-7. All of these heavy metals were successfully recovered from the spent cyclodextrin-based material using nitric acid, allowing the material to be reused for further passes. The results also showed that the presence of alkaline and alkaline earth metals did not have a significant effect on the removal efficiency, indicating that the cyclodextrin-based material could selectively remove the heavy metals of concern without being consumed by alkaline and alkaline-earth metals.

show abstract

“…RAMEB also enhanced the biodegradation of mazout (distillation residue of oil refinery, formerly used as heating fuel) in occurring in a historically contaminated soil (Molnar et al 2003). RAMEB effect is attributed partly to its impact on the surface properties and porosity of the soils (Jozefaciuk et al 2003). RAMEB was found to be slowly biodegradable in soils, displaying about 1-year half-life time .…”

Section: Introductionmentioning

confidence: 99%

Enhanced biodegradation of transformer oil in soils with cyclodextrin ? from the laboratory to the field

Molnár¹,

Leitgib

Gruiz

et al. 2005

Biodegradation

View full text Add to dashboard Cite

The use cyclodextrins for the intensification of bioremediation by improving the mobility and bioavailability of contaminants has recently been studied. In this work, the role of randomly methylated beta-cyclodextrin in the bioremediation of soils contaminated with transformer oil was studied both in bench scale bioreactors and through field experiments. The aims of this research were to (a) establish the scientific background of a cyclodextrin-based soil bioremediation technology, (b) demonstrate its feasibility and effectiveness in the field, and (c) develop an integrated methodology, consisting of a combination of physical, chemical, biological and ecotoxicological analytical methods, for efficiently monitoring the technology performances. The stepwise increasing scale of the experiments and the application of the integrated analytical methodology supported the development of a scientifically established new technology and the identification of the advantages and the limitations of its application in the field. At each phase of the study, randomly methylated beta-cyclodextrin was found to significantly enhance the bioremediation and detoxification of the transformer oil-contaminated soils employed by increasing the bioavailability of the pollutants and the activity of indigenous microorganisms.

show abstract

Effect of Randomly Methylated β-Cyclodextrin on Physical Properties of Soils

Cited by 29 publications

References 21 publications

Cyclodextrins and Their Complexes

Cyclodextrins and Their Complexes

Treatment of mixed contamination in water using cyclodextrin-based materials

Enhanced biodegradation of transformer oil in soils with cyclodextrin ? from the laboratory to the field

Contact Info

Product

Resources

About