Chapter 1-2. Permanent Wave and Disulfide Bond
Recommended Article: 【Biology】 Chapter 1. Composition of Living Organisms
4. Step 3. Curl
5. Step 4. Sulfur Neutralization
Figure 1. Process of a Permanent Wave
1. Structure of Hair
⑴ One strand of hair = macrofibril × n. Hair diameter is 100 ㎛.
⑵ One macrofibril = microfibril × 100-999.
⑶ One microfibril = protofibril × 11.
⑷ Protofibril = α-keratin × 3.
⑸ α-keratin: A single polypeptide. Alpha-helix structure.
2. Step 1. Initial State
⑴ α-keratin is connected to neighboring α-keratin by disulfide bonds.
3. Step 2. Chemical Treatment
⑴ Use of a reducing agent: Converts disulfide bonds to sulfhydryl groups (-SH groups). Inhibits hydrogen bonds and disrupts the alpha-helix structure.
⑵ The reducing agent reaction requires heat.
⑶ Hydrogen bonds: Involved in secondary and tertiary structures of proteins. Temporarily and holistically involved in protein structure.
⑷ Disulfide bonds: Involved in tertiary structures of proteins. Semi-permanently maintain structure.
4. Step 3. Curl
⑴ Physically deformed to change bonding positions.
5. Step 4. Sulfur Neutralization
⑴ Oxidizing agent: Neutralizes the initial dye. Converts sulfhydryl groups back to disulfide bonds.
⑵ The oxidizing agent reaction does not require heat.
Input: 2019.09.13 10:10