A surgeon cleansed his hands with 70% solution of ethyl alcochol before an operation. What is the main mechanism of preparation's antiseptic effect upon microorganisms?

Answer options

1. Oxidation of organic protoplasm components
2. Interaction with hydroxyl enzyme groups
3. Interaction with aminogroups of protoplasm proteins
4. Blockade of sulfhydric groups of enzyme systems
5. Dehydratation of protoplasm proteins