Keratin Proteins and Peptides from Wool, for Hair Restoration pp. 237-242
Authors: (Clara Barba, Sonya Scott, Alisa Roddick-Lanzilotta, Jose Luis Parra, Luisa Coderch, IIQAB (CSIC), Jordi Girona, Barcelona, Spain, and others)
Abstract: Human hair is composed mainly of keratin (80% w/w), an -helical protein with high cystine content, and a small amount of lipids . From a cosmetic point of view, it is the cuticle that gives hair a healthy or unhealthy look. Most beauty care products and treatments primarily affect the cuticle layers. Permanent waving, straightening or relaxing and bleaching during hair coloring processes are major causes of hair damage [2,3]. The complex protein chemistry and the way the molecules assemble together give rise to the unique tensile properties of hair fibres . An important indicator of hair health and strength is its resistance to fracture breakage. Conventional hair treatments can modify hair structure and compromise some of the natural properties of the hair. The deterioration of the hair properties can be noticed in the form of poor manageability, dryness, brittleness, loss of shine and decrease strength (fiber breakage). There is a growing consumer trend in natural actives that can address these negative issues and have the potential to maintain youthful hair [5, 6]. It has been well known for some time, for example, that proteins and protein hydrolysates, are very beneficial to the hair, imparting increased moisturisation, enhancing softness and flexibility .