About Photo-damage Of Human Hair

This paper reviews the current knowledge about human hair photodamage and the photodegradation mechanisms proposed in the literature. It is shown that there are still a number of questions without answer regarding this issue. For example, a better understanding of the hair structural changes caused by different radiation wavelengths is still lacking. We also find controversies about the effects of sun exposure on different hair types. Explanations to these questions are frequently sustained on the amount and type of melanin of each hair, but factors such as the absence of knowledge of melanin structure and of established methodologies to use in human hair studies make it difficult to reach a general agreement on these issues. © The Royal Society of Chemistry and Owner Societies 2006.52165169Hoting, E., Zimmermann, M., Hocker, H., Photochemical alterations on human hair. Part II. Analysis of melanin (1995) J. Soc. Cosmet. Chem., 46, pp. 181-190Pande, C.M., Jachowicz, J., Hair photodamage: Measurement and prevention (1998) J. Soc. Cosmet. Chem., 49, pp. 309-320Ultraviolet Radiation (1994) Environmental Health Criteria 160, , World Health OrganizationOzeki, Ito, S., Wakamatsu, K., Chemical Characterization of melanins in sheep wool and human hair (1996) Pigm. Cell Res., 9 (2), pp. 51-57Borges, C.R., Roberts, J.C., Wilkins, D.G., Rollins, D.E., Relationship of melanin degradation products to actual melanin content. Application to human hair (2001) Anal. Biochem., 290, pp. 116-125Borovansky, J., Elleder, M., Melanosome Degradation: Fact or Fiction (2003) Pigm. Cell Res., 16, pp. 280-286Pfau, A., Hössel, P., Vogt, S., Sander, R., Schrepp, W., The interaction of cationic polymers with human hair (1997) Macromol. Symp., 126, pp. 241-252Smith, G.J., New trends in photobiology: Photodegradation of keratin and other structural proteins (1995) J. Photochem. Photobiol., B, 27, pp. 187-198Robbins, C.R., (2002) Chemical and Physical Behavior of Human Hair, , Springer-Verlag, New York, 4th ednZuidema, P., Govaert, L.E., Baaijens, F.P.T., Ackermans, P.A.J., Asvadi, S., The influence of humidity on the viscoelastic bahaviour of human hair (2003) Biorheology, 40, pp. 431-439Barnicot, N.A., Birbeck, M.S.C., The electron microscopy of human melanocytes and melanin granules (1958) The Biology of Hair Growth, pp. 239-252. , ed. W. Montagna and R. A. Ellis, Academic Press, New YorkVan Der Mei, I.A.F., Blizzard, L., Stankovich, J., Ponsonby, A.-L., Dwyer, T., Misclassification due to body hair a seasonal variation on melanin density estimates for skin type using spectrophotometry (2002) J. Photochem. Photobiol., B, 68, pp. 45-52Draelos, Z.D., The biology of hair care (2000) Dermatol. Clin., 18, pp. 651-658Wolfram, L.J., Human hair: A unique physicochemical composite (2003) J. Am. Acad. Dermatol., 48, pp. S106-S114Sarna, T., Sealy, R.C., Photoinduced oxygen consumption in melanin systems. Action spectra and quantum yields for eumelanin and synthetic melanin (1984) Photochem. Photobiol., 39, pp. 69-74Nogueira, A.C.S., Joekes, I., Hair color changes and protein damage caused by ultraviolet radiation (2004) J. Photochem. Photobiol., B, 74 (2-3), pp. 109-117Bruls, W.A.G., Slaper, H., Van Der Leun, J.C., Berrens, L., Transmission of human epidermis and stratum corneum as a function of thickness in the ultraviolet and visible regions (1984) Photochem. Photobiol., 40 (4), pp. 485-494Braida, D., Dubief, C., Lang, G., Photoageing of hair fiber and photoprotection (1994) Skin Pharmacol., 7 (1-2), pp. 73-77Signori, V., Review of the current understanding of the effect of ultraviolet and visible radiation on hair structure and options for photoprotection (2004) J. Cosmet. Sci., 55, pp. 95-113Ratnapandian, S., Warner, S.B., Kamath, Y.K., Photodegradation of human hair (1998) J. Cosmet. Sci., 49, pp. 309-320Ruetsch, S.B., Kamath, Y., Weigmann, H., Photodegradation of human hair: A microscopy study (2001) Sun Protection in Man, pp. 175-205. , ed. P. U. Giacomoni, Elsevier, AmsterdamCheun, W.L., The chemical structure of melanin (2004) Pigm. Cell Res., 17, pp. 422-424Prota, G., (1992) Melanins and Melanogenesis, , Academic Press Inc, LondonMargalith, P.Z., (1992) Pigment Microbiology, , Chapman and Hall, LondonTolgyesi, E., Weathering of hair (1983) Cosmet. Toiletries, 98, pp. 29-33Agache, P.G., Quencez, E., The mechanism of solar erythema (1988) J. Appl. Cosmetol., 6, pp. 69-78Draelos, Z.D., The biology of hair care (2000) Dermatol. Clin., 18, pp. 651-658Andrady, A.L., Hamid, S.H., Hu, X., Torikai, A., Effects of increased solar ultraviolet radiation on materials (1998) J. Photochem. Photobiol., B, 46, pp. 96-103Müller, U., Rätzsch, M., Schwanninger, M., Steiner, M., Zöbl, H., Yellowing and IR-changes of spruce wood as result of UV-irradiation (2003) J. Photochem. Photobiol., B, 69, pp. 97-105O'Connell, R.A., Walden, M.K., Influence of ionizing radiation on wool fiber properties (1957) Text. Res. J., 27, pp. 516-518Jones, D.C., Carr, C.M., Cooke, W.D., Lewis, D.M., Investigating the photo-oxidation of wool using FT-Raman and FT-IR spectroscopies (1998) Text. Res. J., 68, pp. 739-748Dunlop, J.I., Nicholls, C.H., Electron spin resonance studies of ultraviolet irradiated keratin and related proteins (1965) Photochem. Photobiol., 4, pp. 881-890Davidson, R.S., The photodegradation of some naturally occurring polymers (1996) J. Photochem. Photobiol., B, 33, pp. 3-25Smith, G.J., The effect of light at different wavelengths on electron spin resonance in wool (1976) Text. Res. J., 46, pp. 510-513Smith, G.J., Claridge, R.F.C., Smith, C.J., The action spectra of free radicals produced by the irradiation of keratin containing bound iron(III) ions (1979) Photochem. Photobiol., 29, pp. 777-779Millington, K.R., Church, J.S., The photodegradation of wool keratin II. Proposed mechanisms involving cystine (1997) J. Photochem. Photobiol., B, 39, pp. 204-212Bertazzo, A., Biasiolo, M., Costa, C.V.L., Stefani, E.C., Allegri, G., Tryptophan in human hair: Correlation with pigmentation (2000) Farmaco, 55, pp. 521-525Vincensi, M.R., D'Ischia, M., Napolitano, A., Procaccini, E.M., Riccio, G., Monfrecola, G., Santoianni, P., Prota, G., Phaomelanin versus eumelanin as a chemical indicator of ultraviolet sensitivity in fair-skinned subjects at high risk for melanoma: A pilot study (1998) Melanoma Res., 8, pp. 53-58Liu, Y., Simon, J.D., Isolation and biophysical studies of natural eumelanins: Applications of imaging technologies and ultrafast spectroscopy (2003) Pigm. Cell Res., 16, pp. 606-618Keis, K., Ramaprasad, K.R., Kamath, Y.K., Effect of hair color on luster (2004) J. Cosmet. Sci., 55, pp. 423-436Peterson, L.G., A simplification of the protein assay method of Lowry et al., which is more generally applicable (1977) Anal. Biochem., 83, pp. 346-356Lowry, O.H., Rosebrough, N.J., Farr, A.L., Randall, R.J., Protein measurement with the folin phenol reagent (1951) J. Biol. Chem., 193, pp. 265-275Hearle, J.W.S., A critical review of the structural mechanics of wool and hair fibers (2000) Int. J. Biol. Macromol., 27, p. 123Scanavez, C., Zoega, M., Barbosa, A., Joekes, I., Measurement of hair luster by diffuse reflectance spectrophotometry (2000) J. Cosmet. Sci., 51, pp. 289-302Reich, C., Robbins, C.R., Light scattering and shine measurements of human hair: A sensitive probe of the hair surface (1993) J. Soc. Cosmet. Chem., 44, pp. 221-234Tango, Y., Schimmoto, K., Development of a device to measure human hair luster (2001) J. Cosmet. Sci., 52, pp. 237-25

Atividade biológica do extrato hidroalcoólico de Bauhinia forficata Link sobre Herpetomonas samuelpessoai (Galvão.) Roitman

Inúmeros esforços têm sido dirigidos para conferir às plantas seu real papel e valor na terapia. Este estudo teve como objetivo avaliar a atividade antimicrobiana, mutagênica, toxicidade, e os efeitos no crescimento e diferenciação de Herpetomonas samuelpessoai, do extrato hidroalcoólico de Bauhinia forficata. Para avaliar a atividade antimicrobiana foi realizado o teste de difusão em ágar, bem como a determinação das concentrações inibitória (CIM) e microbicida mínimas (CMM). O potencial clastogênico e/ou aneugênico, in vivo, foi avaliado usando o teste do micronúcleo em medula óssea de camundongos Swiss albinus. Foi determinada também a dose letal média (DL50). O extrato inibiu o crescimento de oito bactérias, mostrando-se mais ativo para Gram-positivas e não foi eficiente para os fungos, tendo sido ativo nas concentrações de 2000, 1000, 500 e 250 mg/mL contra os microrganismos testados. Os resultados mostraram que nas concentrações administradas (500, 1000 e 2000 mg/Kg), não houve aumento estatisticamente significativo de micronúcleos. Não houve ação no crescimento e diferenciação de Herpetomonas samuelpessoai nas concentrações testadas. Com relação a DL50, o extrato não apresentou toxicidade