Investigation into the causes for the changed biodegradation process of dissolved pyrene after addition of hydroxypropyl-β-cyclodextrin (HPCD)

Atomic elucidation of the cyclodextrin effects on DDT solubility and biodegradation

“…Due to its unique hydrophobic nanocavity, CD has been used as a promising adsorbent to encapsulate many hydrophobic pollutants to increase their solubility, reduce their volatility, and/or prevent their encapsulated species from potential chemical reactions. [27][28][29][30][31][32][33] A number of our and other studies have shown that b-CD and its derivatives promote DDT solubility, 34-36 but they also reduce DDT biodegradation to some extent, 35,36 indicating that (i) b-CD-based architectures may not be suitable for the remediation of DDTs and (ii) the increased aqueous solubility of DDT by additives does not necessarily simultaneously increase its bioavailability. More importantly, from a fundamental point of view, the exact mechanisms by which CDs mediate DDT solubility and biodegradability are still unclear.…”

Influence of Hydroxypropyl-β-cyclodextrin on the Extraction and Biodegradation of p,p′-DDT, o,p′-DDT, p,p′-DDD, and p,p′-DDE in Soils

“…It has also been reported that the biodegradation of some HOCs is inhibited by the presence of surfactant and the inhibition is due to decreased substrate bioavailability because much of it is trapped in the micelle of the surfactants (Laha and Luthy 1991;Garcia et al 2001;Lanzon and Brown 2013). On the other hand, there are also reports indicating that the hydrophobicity of the bacterial surface is an important factor that could affect the availability of HOCs to bacteria (Zhang et al 2012). This demonstrates that the bioavailability of HPCDincorporated compounds could be influenced by the properties of the degrading microbe and HPCD might compete with the bacteria for access to the substrate.…”

“…Brown (2007) suggested that the formation of hemimicelles and the sorption of the hemi-micelle HOCs onto the bacterial surface are necessary for surfactantenhancing biodegradation. Zhang et al (2012) investigated the effect of HPCD on the biodegradation of pyrene using five different bacterial strains and found that the hydrophobicity and emulsifying activity of the bacteria present in the soils are strongly correlated with the biodegrading capacity of the microorganisms toward pyrene in the presence of HPCD. This suggested that despite the fact that HPCD could effectively enhance the solubility of many compounds, its effect on the biodegradation of different compounds could still be influenced by many factors, which require further investigation.…”

Biodegradation of the aromatic fraction from petroleum diesel fuel by Oerskovia sp. followed by comprehensive GC×GC-TOF MS

“…PAHs are a group of compounds with two or more fused aromatic rings [8,9]. They are very hydrophobic, with low aqueous solubility and their bioavailability is limited by their high molecular weights and low water dissolution rates [10,11]. Despite these facts, many microorganisms have been isolated primarily for their ability to transform and degrade PAHs to simple molecules [7,12,13].…”