-4 l 0 JOURNAL Of COSMETIC SCIENCE Figure 3. Rcpresentarive SEMs from volunteer hair samples. A: African hair prior to relaxarion, B: African hair following relaxarion, treatment with functional keratin and the neutralization, C: Africa hair following relaxation and neutralization.

2006 TRI/PRINCETON CONFERENCE 411 Table I Results of Tensile Measurements of African Hair from Volunteers Following Relaxation, with and without a Posttreatment of 1 % Functional Keratin Measured parameter (N=50) Energy at 20% extension (x 10- 5 ]) Total energy (x 10- 5 ]) % Extension at peak Average strength at peak (gF) Relaxed hair Relaxed hair posttreated with 1 % functional keratin Students t-test (p) (compared with relaxed hair) 52.6 126.0 38.6 27.3 62.6 147.0 37.6 Base conditioner 30.0 0.003 0.017 0.349 0.074 Conditioner + 1 % functional keratin "Cl cu .:- 0 -----=---7�1!1!!9!11!f"""----------.33!j,5(5l1----7 ... ·- :::J ca 0 .c o "Cl - 0.2 U CD 0 .c ..J .,. J! j - 0 . 4 1=1t=====================t!!�t=======J �.!!!"g ! � -o.s+-----------------00.9�_2!----�...., ! � r--.r-..::::;:;::��:--i.��::------i��������a------, ,_. � Increasing fading .... .5 -0.BIJt=========J■I===� .c ::::, .21 =- - 1 ------------------------------- Figure 4. Amount of fading of tresses, determined by change in lightness relative to non-conditioner treated hair, after the equivalent of 20 days of New Zealand sunlight. which arise from their reversibly protected (s-sulpho) cystine groups, film forming properties and novel amino acid composition. They are suitable for hair care formulations targeted at anti-aging, environmental protection, color protection, protection during chemical treatments, and restoration of chemically and environmentally damaged hair. REFERENCES (1) A. D. Roddick-Lanzilotta, R. J. Kelly, S. M. Scott, K. Mitchell, and S. Chalal, Protecting hair with natural keratin biopolymers, Cosmet. Toiletr., 121(5) 61-68 (2006). (2) A. D. Roddick-Lanzilotta, R. J. Kelly, S. M. Scott, S. Chahal, and N. Challoner, Measurement and prevention of hair phoroageing,J. Cosmet. Sci., 55 (Suppl), Sl 13-121 (2004). (3) A. D. Roddick-Lanzilotta, R. J. Kelly, S. M. Scott, S. Chahal, and N. Challoner, Anti-ageing efficacy in hair care products, SOFW Int. J. Appl. Sci., 11 (2004).