Atomic elucidation of the cyclodextrin effects on DDT solubility and biodegradation

Area of Science:

• Environmental Chemistry
• Biotechnology
• Molecular Simulation

Background:

• DDT (1,1,1-trichloro-2.2-bis(p-chlorophenyl)ethane) is a persistent insecticide posing significant environmental and human health risks.
• Poor bioavailability limits the effective biodegradation of DDT into benign components.

Purpose of the Study:

• To investigate the structure-specific interactions of alpha-, beta-, and gamma-cyclodextrins (CDs) with DDT.
• To determine the impact of these interactions on DDT solubility and biodegradability.

Main Methods:

• Experimental studies combined with molecular simulations.
• Analysis of cyclodextrin-DDT binding affinities and orientations.
• Assessment of DDT bioavailability and membrane permeation.

Main Results:

• All three cyclodextrins (α-, β-, γ-CD) enhanced DDT solubility by binding to its hydrophobic core.
• Beta- and gamma-CDs exhibited strong binding, fully encapsulating DDT.
• Alpha-CD showed weaker binding, allowing partial DDT exposure and facilitating membrane interaction and permeation.

Conclusions:

• Alpha-cyclodextrin uniquely promotes DDT bioavailability and biodegradation by balancing solubility enhancement with membrane interaction.
• The distinct binding modes of CDs with DDT provide insights for designing improved cyclodextrin derivatives for pollutant remediation.