An amphiphilic solvent is a liquid whose molecules contain both a water-attracting (hydrophilic) region and an oil-attracting (lipophilic or hydrophobic) region. This allows the solvent to interact with and dissolve a wider range of substances than purely polar or purely non-polar solvents.
Alcohols such as isopropyl alcohol (IPA) and ethanol are common amphiphilic solvents. Their hydroxyl (-OH) group interacts with water, while their hydrocarbon chain interacts with oils, waxes, lipids, and many organic compounds. Because of this dual nature, IPA can dissolve both water-soluble contaminants and lipid-rich materials such as plant cuticle waxes and insect cuticular lipids.
In plants, this amphiphilic property is one reason alcohols can damage the cuticle. The alcohol molecule can penetrate the waxy surface while remaining compatible with water, allowing it to extract or disrupt cuticular lipids and increase cuticle permeability.
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