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Overview         (For age - group : Above 16 )

Hair is mostly protein, one of nature's polymers. it is a chemical, its pigments and proteins are all chemicals, how these chemicals give color and structure to hair is an interesting study by itself, animation details out medulla, cortex, cuticle, keratin, melanin, eumelanin and phaeomelanin, and gives the hair protein structure. This animated topic gives in-depth information chemistry and structure of hair.

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Structure and chemistry of hair
Content : Educational science software
Type :
Animation

Duration :
9 minutes

    Topics Covered :
  • What is the structure of hair protein?
  • What is chemical composition of hair?
  • What is Medulla, Cortex, Cuticle?
  • Which amino acids are present in hair?
  • Which chemical is responsible for coloring of hair?

Snapshots         
Pigments and structure of hair protein
Pigments and structure of hair protein
Hair root and follicle Hair, medulla, cortex and cuticle
Hair root and follicle
Hair, medulla, cortex and cuticle
Details of the animation/ movie /software

Content of the science animation : Hair is mostly protein, one of nature's polymers. The structure of protein in hair is a-helix structure.The structure of protein is depend on the position of the C=O---H-N hydrogen bonds.
The innermost layer of the hair is the medulla. This layer of hair is often missing in fine hair or light blonde hair. Its purpose is unknown. The middle layer of the hair is the cortex, responsible for giving the hair its elasticity, tenacity, and strength. It is in this layer that pigment, the substance that gives color to the hair, is found. In this layer, chemical changes take place, once the cuticle has been penetrated.

Hair is composed of a fibrous protein, keratin, which originates in the hair follicle. The hair is made up of long amino acid chains joined to each other by peptide bonds.
The hair gets its color from a pigment known as melanin. The color of a person's hair is determined by their genes. Melanin is produced by melanocytes, cells that exist near the hair bulb. They collect and form bundles of a pigment protein complex called melanosomes. There are two types of melanin, eumelanin which is brown/black in color and phaeomelanin which is red.

All about it inside the animation.

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Buyers Feedback:
  Short should be more lengthy but good content by amit
 

Q & A
Q1: Nées an ebook on haïr chemistry Richard 23/7/2015
Ans:
   
Q2: Inwhwich layer of the hair do chemicals changes take place? catherine tanti 28/3/2011
Ans:
   
Q3: structure of hair/cuticle/cortex and medulla DAWN MUNGALL 30/4/2009
Ans:
   
Q4: What is the molecular weight limit for molecules that can be absorbed through the pores in our hair. C Marshall 19/7/2008
Ans: Pore size is largely determined by genetics, If your parents had large pores, you will likely have them as well. However, your lifestyle (i.e., sun exposure) plays a key role in how they shape up in adulthood. Typically the pore diameter is only 50 microns. 1 micron = 1/1000 millimeter and the diameter of human hair is 80 to 100 microns. So guess this is the maximum dia a molecule must have to pass through the hair pore.
   
Q5: what is the effect of zinc in Androgenetic Alopecia?what is the action of zinc? sanaz Amirtabar 21/2/2007
Ans: Zinc is non-steroidal inhibitor of 5 alpha-reductase activity the regulator of DHT production, very effective in combination with Vitamin B6 and Azelaic Acid. Hair protein structure alters, when zinc is deficient. Zinc is needed for body’s growth. It plays a major part in production and processing of 42 vital enzymes, in cell production, tissue growth, protein synthesis, collagen formation & repair and maintenance of the oil-secreting glands of the scalp. It is useful in dandruff prevention.
   
Q6: could you send me some animations about hair growth cycle and miniaturization of hair follicles? Sanaz Amirtabar 19/2/2007
Ans: Sanaz, the above animation deals with the structure and chemistry of hair, what you need, is in a project on hair science, under research and development in our company in which we are going to explain about trichology and the skin of scalp. But it will take some time. We are sorry that we are unable to help you out with this.
   
Q7: Can scalp or pores on the scalp or hair follicle absorb external nutrients or anything which we apply on scalp (either herbal products like eggs extracts) or not? Zarqa Firdous 23/1/2007
Ans: The answer is yes, but the degree of absorption varies. Scalp, pore, hair follicle are all skin & have a cell membrane. All oil and egg yoke contain lipids (fats) or proteins. Molecular weight decides permeation. If the molecules are small, they are absorbed. Simple lipids found in topical creams are absorbed into the skin while complex ones of sun cream only coat the outer layer of skin and make it greasy but cant get through. Alcohols pass through easily, glycerol, urea, glucose take longer.
   
Q8: Would you like someone to contribute ideas or review the animation? KY Chan 19/5/2006
Ans: Yes, definitely we welcome all contributions in forms of ideas, feedback, comment or review that will make this site or animation more useful for our viewers, you can send them on this address response@goalfinder.com, we will also send to you the links for reviewing our animation, thanks
   


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