Why do you have gray hairs?

Why do you have gray hairs?

The reasons that cause gray hairs
l   oxidative stress
 Inappropriate production of oxidants will intricately connect to ageing and life
Span such as the cell in hairs
l   Lack of melanocyte in keratinocytes.
l   Melanocyte can’t excrete melanin

 
The chemical properties of hairs
l   The main component is keratin included eighteen amino acids.
l   Hairs contain 12-13% water (250c, RH65%)
l   Hair has Melanocyte to excrete melanin and dominates 3%.
l   Hair has lipids and depends on individuals. Most of all are free fatty acids and dominate around 1-9%.
l   Hairs have trace elements such as Cu, Zn, Ma, Ca, Mn, P, and Si.

The physical properties of hairs
The hair has cysteine, so hair is strong and also has extension.

Amino acid
Keratinocyte of hair(%)
Keratinocyte of epidermis(%)
Glycine
6
6
Alanine
2.8
Valine
5.5
4.2
Leucine
6.4
8.3
Isoleucine
4.8
6.8
Phenylalanine
2.4-3.6
2.8
Proline
4.3
3.2
Serine
7.4-10.6
16.5
Threonine
7.0-8.5
3.4
Tyrosine
2.2-3.0
3.4-5.7
Aspartate
3.9-7.7
6.4-8.1
Glutamate
13.6-14.2
9.1-15.4
Arginine
8.9-10.8
5.9-11.7
Lysine
1.9-3.1
3.1-6.9
Histidine
0.6-1.2
0.6-1.8
Tryptophan
0.4-1.3
0.5-1.8
Cystine
16.6-18
2.3-3.8
Methionine
0.7-1.0
1.0-2.5

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