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Volume 41 (2007)
- Issue 4 Pages 241-
- Issue 3 Pages 159-
- Issue 2 Pages 87-
- Issue 1 Pages 3-
Volume 41, Issue 1
Displaying 1-4 of 4 articles from this issue
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Establishment of New Preparation Method of NiosomesKinka Ri2007 Volume 41 Issue 1 Pages 3-14
Published: March 20, 2007
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSNiosomes (Nonionic surfactant vesicles) just like liposomes have the potential to be used as carriers of active ingredients for topical usage, such as cosmetics and medicines. The conventional methods for preparing vesicles have been briefly reviewed. Vesicles are, however, prepared basically by using organic solvents, such as chloroform, ethers, etc., which are harmful to the human body. The object of this study was to optimize the process for preparing one kind of nanomaterials, niosomes, by using a supercritical reverse phase evaporation method (scRPE method) without using any co-solvents. Formation of niosomes of nonionic surfactants has been studied based on the solubility behavior of nonionic surfactants in supercritical CO2 (scCO2). The formation ability of niosomes was evaluated by trapping efficiency measured by the glucose dialysis technique. Furthermore, the structure of niosomes was of a large unilamellar vesicle as revealed by freeze-fracture transmission electron microscopy (FF-TEM) images and DSC measurement. This new method is considered to be able to encapsulate different useful active ingredients easily and gain high performance nanomaterials for medicines, cosmetics, foods, etc., with an environment-friendly alternative solvent, supercritical CO2.View full abstractDownload PDF (3698K) -
Ai Oba, Takumichi Sugiyama2007 Volume 41 Issue 1 Pages 15-21
Published: March 20, 2007
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSOne of the important approaches in cosmetics to prevent the development of skin aging symptoms such as wrinkles is to treat the skin in the early photoaging stage. However, it is difficult for most cosmetic users to perceive the degree of their skin damage caused by chronic UV exposure, especially in the dermis. Therefore, the establishment of non-invasive methods for the assessment of dermal UV damage is to be expected. In this study, we measured the facial skin of 127 healthy Japanese women (aged 25-38) using the Cutometer, and Resiliometer which we invented. Mechanical parameters obtained by the Cutometer, Ur and Ur/Uf, which are correlated with the accumulation of denatured elastic fibers in our previous study, linearly decreased with age, and correlated with water content of the stratum corneum. On the other hand, a Resiliometer parameter, τ, which correlates with the three-dimensional structures of dermal collagen fibers, did not change linearly, but showed interesting behavior with age. In addition, no correlation was shown between τ and water content of the stratum corneum. These results suggested gradual changes of the matrix components in the dermis with age. However, most of the subjects without obvious skin aging symptoms did not notice such changes in the dermis. We think that the estimation of the degree of UV-induced skin damage in the early photoaging stage using a variety of non-invasive methods is beneficial for cosmetic users to notice their skin condition and to find an appropriate skin care solution.View full abstractDownload PDF (2165K) -
Yuta Miyamae, Yumika Yamakawa, Yukihiro Ozaki2007 Volume 41 Issue 1 Pages 22-30
Published: March 20, 2007
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSThis paper reports a non-destructive method for evaluating hair interior and surface damage based on near-infrared (NIR) diffuse reflectance (DR) spectroscopy. It is important to know the extent of chemical damage in the interior and surface proteins of the hair in order to choose an appropriate restoration agent or chemical treatment. Unfortunately, though there are many simple and non-destructive methods for evaluating the hair surface, the existing evaluation methods for monitoring chemical changes in the interior proteins are very complicated and destructive. Therefore, we have attempted to develop a new non-destructive method to evaluate the damage to the hair interior and surface simultaneously by using NIR-DR spectroscopy. The key to this study was that the combination of NIR-DR spectroscopy and principal component analysis (PCA) were applied to development of an evaluation of hair damage and we found the most suitable wavenumber region (5060-4500cm-1) for the evaluation of hair damage. In this study, we developed a new evaluation method that can indicate hair interior and surface damage conditions induced by chemical treatments in a simple, rapid, non-destructive manner based on NIR-DR spectroscopy by putting a fiber probe on hair.View full abstractDownload PDF (3852K) -
Ken-ichi Tanaka, Yutaka Tango, Koichi Shimmoto2007 Volume 41 Issue 1 Pages 31-38
Published: March 20, 2007
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSThe ability to examine interior hair structure is very important in designing effective hair products. But a non-destructive method for continuous, full-color examination of the interior hair structure has been lacking. This study proposes a new method that enables non-destructive and continuous measurement of the interior hair structure with color information. In our method, Optical CT (OCT) is used for reconstruction of interior hair structure. Our new theories enabled us to solve the crucial problem of an OCT system related to a large observational error caused by internal light scattering, and to make practical application possible. A new OCT system based on our method was implemented. This system displayed sufficient accuracy when the phantom image was measured, and by observing human hair, clear and full-color cross-sectional images were obtained without destruction of the sample. When the bleaching and dyeing processes were continuously measured, changes in the interior hair with time could be observed. These results clearly indicate that our new method provides a powerful tool in research and product development.View full abstractDownload PDF (3118K)
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