Hair type

Shampoos have been prepared in various forms, and have included systems that are thick and thin, clear and opaque, pourable Hquids, soflds, gels, pastes, powders, flakes, and aerosol types. In many cases, shampoos have been prepared and directed for various hair types, eg, normal, dry, damaged, and color treated. Most marketed shampoos (ca 1993) are primarily clear Hquid and opaque lotion types gel and paste forms also are available. Aerosol shampoos are available to the consumer however, their impact on the market has been limited to the dry shampoo aerosol. 

Human hair is made from a coiling protein called keratin. All hair has a little bit of coil to it, even if it appears to be straight. Some hair types have more coil to them than other hair types. Some people go to great lengths to change the type of coil naturally found in their hair. 

Hair types head/trunk Terminal and vellus Guard, auchene, awl, and zigzag... 

Unique hair types No homologous structure Vibrissae... 

Sundberg, J. P. and Hogan, M. E. (1994) Hair types and subtypes in the laboratory mouse, in Handbook of mouse mutations with skin and hair abnormalities animal models and biomedical tools (Sundberg, J. P., ed.). CRC Press, Boca Raton, FL. 

The relationship between the concentration of cocaine in the exposure solution and the amount of cocaine in the final extract for two types of hair is shown in Figure 6. Concentrations employed for this study were from 1 pg/mL cocaine plus radiotracer to 500 pg/mL cocaine plus radiotracer in phosphate-buffered saline (PBS), and all samples were exposed for 1 h and dried as previously described. Even though this figure represents data obtained from a series of several experiments, a linear plot is easily fitted to the data. However, the amount incorporated varies depending upon the hair type, reflecting a matrix bias that is explored in more detail below. 

The binding of cocaine or morphine to ten different hair types. Hair type is not a well-defined term. However, it reflects hair color, hair history, race, and ethnicity of its donor. 

While the in vivo studies cited above suggest bias among hair types, these studies contained too few subjects to reach statistical significance, or these studies were based upon self-reported use, which may be inaccurate. Mieczkowski and Newel have... 

VI. Binding Studies with Different Hair Types.82... 

This review surveys morphological, ultrastructural, and chemical differences between ethnic hair types which may affect the binding of drugs of abuse to hair. Selected studies are discussed regarding the binding of metals, chemicals, and drugs of abuse to different ethnic hair types and the effects of hair color and chemical treatments on drug disposition in hair. A mechanistic discussion of chemical and... 

There are differences in the chemical and physical attributes of ethnic hair types together with considerable intraethnic variation. Table 1 provides a compilation of differences between hair types of three major ethnic groups. Unfortunately, many of these findings are based on small numbers of subjects and are in need of further validation. Despite these limitations, differences between ethnic hair types warrant special attention because of their importance in the binding of drugs to hair. 

Amino Acid Content of Ethnic Head Hair Types... 

VI. BINDING STUDIES WITH DIFFERENT HAIR TYPES... 

The binding of chemicals to hair is also affected by hair type. Lotzsch et al. studied the adsorption and desorption of distearyl-dimethylammonium chloride (DSD-MAC) with three Caucasoid and three Mongoloid hair samples. DSDMAC is a cationic surfactant which is used in commercial cosmetic products such as setting lotions and rinses for hair treatment. For hair samples treated with DSDMAC, adsorption was... 

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