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Volume 35 (2001)
- Issue 4 Pages 289-
- Issue 3 Pages 204-
- Issue 2 Pages 99-
- Issue 1 Pages 1-
Volume 35, Issue 4
Displaying 1-7 of 7 articles from this issue
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Noboru Nagatani2001 Volume 35 Issue 4 Pages 289-297
Published: December 20, 2001
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSW/O emulsions are suitable for cosmetic foundations, as they are excellent in water repellency. In particular when silicone oils are used for the oil a feeling of W/O emulsions is good. In order to obtain the structure condition as W/O type surfactants to prepare stable W/O silicone emulsions, glycerylether derivatives with silicone chains were focused on. And stable low-viscosity W/O emulsions were prepared by using the most suitable glycerylether modified silicone. In this paper the stabilization mechanism and the application example for cosmetic foundations are described.View full abstractDownload PDF (2126K) -
Tadao Fukuhara, Kazuo Komatsu, Seiichi Yoshida, Okihiko Sakamoto, Mich ...2001 Volume 35 Issue 4 Pages 298-304
Published: December 20, 2001
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSAn on-line LC/NMR system combining semimicro LC and 400MHz-NMR with a 3mm i.d. probe was developed. A semimicro LC column (1.5mm i.d.×250mm) was used for various studies with a mobile phase of D2O/CD3CN mixture at 100-125μL/min flow rates. This system required only 6-7.5mL/h of mobile phase, significantly improving cost-performance and allowing the use of expensive deuterated solvents so that solvent signals could be easily minimized. In addition, improvement of the sensitivity due to the condensation effect of semimicro LC was achieved, and the results fully supported the advantage of the semimicro LC/NMR system. Identification limits of ethyl p-hydroxybenzoate for this semimicro LC/NMR system were a few μg for ON-FLOW method and sub μg for STOP & FLOW method. This system also applied for the analysis of herb medicine powders of cosmetic ingredients. It was possible to monitor minor components without a preparative procedure, therefore it was useful for rapid screening of the effective components as cosmetic ingredients.View full abstractDownload PDF (1567K) -
Tadashi Uchino, Hiroshi Tokunaga, Masanori Ando2001 Volume 35 Issue 4 Pages 305-311
Published: December 20, 2001
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSWe have already reported the analytical method of procaine hydrochloride and dibucaine hydrochloride (prohibited in cosmetics on the public comment of Ministry of Health and Welfare of Japanese Government in 1986). In order to find out another prohibited ingredients in cosmetics, we estimated the analytical method of vitamin L1 and pilocarpine hydrochloride by HPLC. Vitamin L1 and pilocarpine hydrochloride in the lotions or milky lotions were extracted with methanol. The extract was analyzed by HPLC using the column (Shiseido CAPCELL PAK C18, 4.6×250mm) and a mixture of acetonitrile and 50mM phosphate buffer (pH 5) (37:3) or (19:1) for vitamin L1 and pilocarpine hydrochloride were used. The detection wavelength of vitamin L1 and pilocarpine hydrochloride were at 244 and 214nm, respectively. By the use of the above analytical method we made it sure that vitamin L1 and pilocarpine hydrochloride could be determined without the interference of the ingredients.View full abstractDownload PDF (612K) -
Keiichi Nagai, Tomoko Yasumasu, Masaru Tamura, Akinori Igarashi, Masah ...2001 Volume 35 Issue 4 Pages 317-324
Published: December 20, 2001
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSWe studied the application of malic acid monolaurylamide (MAA) for a new skin care cleansing agent. MAA neutralized by potassium hydroxide (MAAK) showed an excellent fresh feeling after washing the skin because of quick Ca-salt formation while rinsing out. The order of the skin tightness after washing was potassium laurate>sodium polyoxyethylene lauryl ether sulfate (3E.O.)>potassium lauroylglutamate>potassium N-lauroyl-N-methyl-β-alaninate≥MAAK. The amounts of MAAK residue on the surface and in the deeper portion of the skin were found to be almost 1/10 of those of potassium laurate. In addition, MAAK had selective cleaning ability and showed to minimize the release of the Natural Moisturizing Factor from the skin compared to potassium laurate. The characteristics of MAAK are also significant in mixed surfactant systems. For example, fresh feeling in rinsing out process was maintained even though MAAK was mixed with another surfactant, which has a slimy feeling, such as lauryl dimethylaminoacetic acid betaine. Also, when MAAK was added to potassium laurate, potassium laurate residue on the skin was decreased and the skin tightness became low after washing. Therefore, MAAK is concluded to be a very valuable surfactant for the skin washing agent.View full abstractDownload PDF (846K) -
Yuji Masuda, Motoji Takahashi, Tetsuo Sakamoto, Miho Shimada, Masahide ...2001 Volume 35 Issue 4 Pages 325-332
Published: December 20, 2001
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSIt is crucial to develop accurate measuring method for skin pigmentation in preparation of effective whitening agents or cosmetics. We developed a system, it is called REMO-STAIN system, by which we were able to measure the stain at any part and in any area of face. However, this system was slightly influenced by pimples and redness of face because stains were selected using the color difference (ΔE) between stain and around normal areas. We have developed the method to calculate the concentration of melanin and hemoglobin from skin reflection spectrum using multiple regression analysis, assuming that Lambert-Beer's law is applicable to skin reflection spectrum among 500-700nm and that the absorption spectra of skin is expressed as linear summation of melanin in epidermis, hemoglobin in vessel blood and absorption in dermis. We applied this method to REMO-STAIN system to develop a new system to estimate skin pigmentation quantitatively without influence of pimples and reddish face. This new REMO-STAIN system can measure the melanin and hemoglobin contents at each pixel in CCD images of the face and calculate the area of pigmentation in the facial skin. So, new REMO-STAIN system seems to be very useful in the efficacy test of depigmentation products.View full abstractDownload PDF (1285K) -
Masahiko Ooe, Keiko Tanida, Tatsuo Yamamura2001 Volume 35 Issue 4 Pages 333-337
Published: December 20, 2001
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSTransparent skin is demanded as the ideal skin condition by the majority of women. Therefore to analyze its characters in scientific aspects is an important study for the development of cosmetics. The recognition survey for skin transparency withdrew that water holding into stratum corneum was a critical parameter. Therefore, to clarify whether the skin transparency referred by women is related to the transmittance of stratum corneum or the water contents, the relationship between the transmittance of stratum corneum and water contents were examined by using the peeled human stratum corneum in vivo. The adequate hydrations in the stratum corneum (until 38% H2O per SC weight) exhibited gradually to increase the transmission, however, excess hydration conversely decreased. Furthermore, women who had a higher value of water contents or claimed higher transparency themselves showed to increase the reflection on skin surface under excess hydrated conditions. From these findings, it was speculated that the skin transparency claimed by women was caused by the transmittance of the stratum corneum. In this study, we proposed one possible factor for the skin transparency.View full abstractDownload PDF (536K) -
[in Japanese]2001 Volume 35 Issue 4 Pages 339-345
Published: December 20, 2001
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSDownload PDF (2837K)
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