Biodegradation of cyclodextrins in soil

• Published in: Chemosphere (Oxford) Vol. 60; no. 8; pp. 1001 - 1008
• Main Authors: Fenyvesi, E., Gruiz, K., Verstichel, S., De Wilde, B., Leitgib, L., Csabai, K., Szaniszlo, N.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-08-2005; Elsevier
• Subjects: Acetylation; alpha-Cyclodextrins - analysis; alpha-Cyclodextrins - metabolism; Applied sciences; Bacteria, Aerobic - metabolism; beta-Cyclodextrins - analysis; beta-Cyclodextrins - metabolism; biodegradation; Biodegradation, Environmental; Bioreactors; bioremediation; Contaminated soil; cyclodextrins; Decontamination. Miscellaneous; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Exact sciences and technology; gamma-Cyclodextrins - analysis; gamma-Cyclodextrins - metabolism; hydorxypropyl beta-cyclodextrins; Industrial Waste; Methylation; Oils; Petroleum; polluted soils; Pollution; Pollution, environment geology; random methylated beta-cyclodextrins; Randomly methylated β-cyclodextrin; Remediation; Soil and sediments pollution; Soil Microbiology; soil microorganisms; Soil Pollutants; soil pollution; Randomly methylated β-cyclodextrin; Contaminated soil; Remediation; Organic matter; Hydrocarbon; Biodegradability; Oligoholoside; Environmental factor; Soil pollution; Randomly methylated P-cyclodextrin; Persistence; Additive; Cyclodextrin; Decontamination; Bioremediation
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2005.01.026

Cyclodextrins, especially random methylated βCD (RAMEB) and hydroxypropyl βCD (HPβCD), are becoming common enhancing additives in the bioremediation of soils formerly contaminated by hydrocarbons and/or other poorly bioavailable organic pollutants. Therefore, their degradation in the soil, particularly the most persistent RAMEB, has been of great concern. Like oil contaminants, these additives should be biodegradable via an environmentally safe technology. Hence, in this paper, the biodegradability of eight different cyclodextrins (CDs) in four different soils was examined under various treatment conditions in laboratory and pilot scale field experiments.
This paper is the first report on the potential biological fate of CDs studied under a large variety of environmental conditions and in different soil ecosystems. Data on the potential relationship between CD biodegradation and the biological removal of hydrocarbons in the CD-amended contaminated soils are also given.
All CDs were found to be more or less biodegradable; even the most persistent RAMEB was depleted from soils under favourable conditions. In the field experiments, the depletion of RAMEB to about 40% of its initial level was observed for a period of 2
years in hydrocarbon-contaminated soils of high organic matter and cell concentration.