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Crystallization behavior of polyvinyl alcohol with 1,2-diol side-chains / Mitsuo Shibutani in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 2 (05/2018)
[article]
Titre : Crystallization behavior of polyvinyl alcohol with 1,2-diol side-chains Type de document : texte imprimé Auteurs : Mitsuo Shibutani, Auteur ; T. Yamamoto, Auteur ; K. Inoue, Auteur ; K. Tokumitsu, Auteur Année de publication : 2018 Article en page(s) : p. 234-244 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Additifs
Alcool polyvinylique
Analyse thermique
Calorimétrie
CristallisationIndex. décimale : 668.4 Plastiques, vinyles Résumé : The crystallization behavior of a newly developed polyvinyl alcohol with 1,2-diol side-chains (DPVA) was investigated for different 1,2-diol side-chain, magnesium acetate, and sodium acetate contents. Crystallization by stepwise cooling, isothermal and non-isothermal crystallization (the actual cooling process in melt molding) experiments were conducted. Upon crystallization analysis by stepwise cooling, the end surface energy of DPVA increased as the 1,2-diol side-chain content was increased. The isothermal crystallization process exhibited longer half crystallization times at high 1,2-diol side-chain and magnesium acetate contents. Upon Kissinger analysis of the non-isothermal crystallization results, the effect of the acetate salts was found to be smaller than that for isothermal crystallization, while the smaller number of repeating units in the lamellar structure, reflecting a higher side-chain 1,2-diol content, resulted in a smaller activation energy for DPVA crystallization. In addition, analyses by the Ozawa method and the Kissinger Plot suggested possible changes in the mode and dimension of the crystal growth of DPVA. Note de contenu : - EXPERIMENTAL : Preparation of DPVA - Additives for DPVA - DPVA additive mixing conditions - Crystallization by stepwise cooling - Isothermal differential scanning calorimetry (DSC) analysis - Non-isothermal DSC analysis
- RESULTS AND DISCUSSION : DPVA crystallization by stepwise cooling - Isothermal crystallization conditions : Tm - 14°C - Non-isothermal DSC anaysisDOI : 10.3139/217.3479 En ligne : https://drive.google.com/file/d/1pUHqFKyjaHKRK1Wn_KnwIiZYmuVxRHcu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30572
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 2 (05/2018) . - p. 234-244[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19873 - Périodique Bibliothèque principale Documentaires Disponible Epidermal tight junction : the master skin barrier regulator / S. Kuroda in IFSCC MAGAZINE, Vol. 12, N° 2 (04-05/2009)
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Titre : Epidermal tight junction : the master skin barrier regulator Type de document : texte imprimé Auteurs : S. Kuroda, Auteur ; M. Kurasawa, Auteur ; M. Mizukoshi, Auteur ; T. Maeda, Auteur ; T. Yamamoto, Auteur ; A. Oba, Auteur ; H. Sasaka, Auteur Année de publication : 2009 Article en page(s) : p. 87-91 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Calcium gradient Cell polarity Lamellar body Skin barrier Tight junction Index. décimale : 668.5 Parfums et cosmétiques Résumé : Tight junctions between adjacent epithelial cells control paracellular permeability of solutes and maintain cell polarity by fencing lipid bilayer components into demarcated apical and basolateral domains. In the present study we investigated the role of epidermal tight junctions in two skin physiological processes, "formation of the epidermal calcium ion (Ca2+) gradient" and polarized lamellar body secretion". The former is based on the fact that the epidermal Ca2+ gradient is closely related to epidermal differentiation and the latter on the knowledge that polarized lamellar body secretion is essential to supply intercellular lipids to the stratum corneum. We hypothesized that tight junctions might form the Ca2+ gradient in the epidermis by sealing cell-cell contact at the stratum granulosum and allow the lamellar bodies to be normally secreted toward the stratum corneum by giving granular cells polarity. In our experiments we discovered that tight junctions control not only both intercellular Ca2+ permeability and fluorescent ceramide analog (Cer-FL) secretion in cultured normal human keratinocyte cells but also both intercellular calcium distribution and polarized lamellar body secretion in the skin equivalent. Thus, tight junctions should be responsible for linking a series of processes from epidermal differentiation to stratum corneum barrier formation. Our findings suggest that tight junctions should have a crucial role not only in epidermal barrier function but also in both epidermal differentiation and stratum corneum barrier function. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6097
in IFSCC MAGAZINE > Vol. 12, N° 2 (04-05/2009) . - p. 87-91[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011489 - Périodique Bibliothèque principale Documentaires Disponible The efficacy of a highly occlusive formulation for dry lips / Eiko Tamura in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 1 (02/2020)
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Titre : The efficacy of a highly occlusive formulation for dry lips Type de document : texte imprimé Auteurs : Eiko Tamura, Auteur ; H. Yasumori, Auteur ; T. Yamamoto, Auteur Année de publication : 2020 Article en page(s) : p. 46-52 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cires
Cosmétiques
Couche cornée
Formulation (Génie chimique)
Huiles et graisses
Lèvres
Lèvres -- Soins et hygiène
Matériaux occlusifs
RugositéIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : Since skin on the lips has a lower water content in the stratum corneum (SC) and a higher transepidermal water loss (TEWL) value than skin on the cheek, the lips are usually very dry and rough areas. Therefore, a lip balm approach to increase occlusivity of the lips is generally used to reduce water loss. Although there have been reports of an improvement effect on lip roughness by specific care agents, differences in the effects due to the occlusivity of a formulation without a specific care agent have not been reported. The purpose of this study was to clarify the improvement effect on dryness and roughness of the lips by a highly occlusive formulation consisting of a combination of common oil and wax, not by a specific care agent.
- Methods : Twenty Japanese female subjects with normal skin (age range 20-39 years; mean 28.1) were enrolled in this study. A 4-week continuous use test was conducted using samples with low and high occlusivity. The degree of lip roughness and wrinkles was scored, the hollow index was assessed using ANTERA 3D images, and values of capacitance and TEWL were measured.
- Results : The hollow index was significantly correlated with both the appearance roughness score and the wrinkle score. The sample with high occlusivity showed significant improvement in the appearance roughness score, wrinkle score, the hollow index and capacitance of the SC. In a comparison between the groups of samples with different occlusive properties, a significant improvement effect in rough appearance was seen in subjects using the highly occlusive formulation.
- Conclusion : The hollow index assessed by ANTERA 3D imaging allowed the objective evaluation of the improvement in appearance. In the case of continuous use of the highly occlusive formulation, an improvement of capacitance in the SC, which is most correlated with lip roughness, was obtained after 2 and 4 weeks. These results demonstrate for the first time that a highly occlusive formulation is effective in improving the roughness of the lips, and this effect is due to the difference in the occlusive property not by a specific care agent.Note de contenu : - MATERIALS AND METHODS : Ethics - Subjects - Materials - Measurment of occulisivity - Biophysical measurements of the SC - Degree of lip roughness and wrinkles - ANTERA 3D image analysis - Statistical analysis
- RESULTS : Before continuous use - Relationship between the appearance score and the hollow index - Relationship between the appearance score and SC parameters - Relationship between the hollow index and SC parameters - Characteristics of lips after continuous use of samples - Changes in appearance score - Changes in the hollow index - Changes in SC functions - Comparison between two groups
- DISCUSSION : Correlation betwen visual scores before continuous use and measurement data - Improvement effect by continuous use testDOI : 10.1111/ics.12583 En ligne : https://drive.google.com/file/d/1yhN4WjFj-QVS7CziyaPlEJ_ZmXKmeWrO/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33678
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Code-barres Cote Support Localisation Section Disponibilité 21486 - Périodique Bibliothèque principale Documentaires Disponible The efficacy of synthetic pseudo-ceramide for dry and rough lips / E. Tamura in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 43, N° 2 (04/2021)
[article]
Titre : The efficacy of synthetic pseudo-ceramide for dry and rough lips Type de document : document électronique Auteurs : E. Tamura, Auteur ; J. Ishikawa, Auteur ; T. Yamamoto, Auteur Année de publication : 2021 Article en page(s) : p. 158-164 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Céramides Un céramide est un sphingolipide résultant de la combinaison d'un acide gras avec la sphingosine via une liaison amide. On trouve de telles molécules en abondance dans les membranes cellulaires, où elles entrent notamment dans la constitution des sphingomyélines. Les céramides ne jouent pas qu'un rôle structurel dans les membranes biologiques, et peuvent également revêtir des fonctions de signalisation lipidique. Leurs actions les mieux comprises vont de la différenciation cellulaire à la mort cellulaire programmée (apoptose) en passant par la prolifération cellulaire.
Les acides gras qui les constituent ont généralement un nombre pair (de 16 à 24) d'atomes de carbone, sont saturés ou monoinsaturés, et sont souvent α-hydroxylés.
La plupart des céramides n'existent pas à l'état naturel si ce n'est comme précurseurs de la biosynthèse des sphingolipides par une réaction d'addition sur la fonction alcool primaire de la sphingosine. (Wikipedia)
Cosmétiques
Lèvres -- Soins et hygiène
Perte insensible en eau
RugositéIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - OBJECTIVE : Lips can easily become dry and rough, one reason being the characteristics of their ceramide (CER) profile. Lips have lower levels of total ceramides, higher percentages of CER[NS] and CER[AS], and lower percentages of CER[NP] and CER[NH] than skin in other regions of the body. The purpose of this study was to clarify the effects of synthetic pseudo-ceramide (pCer; Cetyl-PG hydroxyethyl palmitamide) to improve the dryness and roughness of the lips of healthy subjects in a formulation that exclude an occlusive effect.
- METHODS : Thirty-one Japanese female subjects with normal skin (age range 21–37 years; mean 28.6) were enrolled in this study. A four-week continuous use test was conducted using samples with or without 0.5% or 2.0% pCer. The degree of lip roughness was scored, and values of capacitance, transepidermal water loss (TEWL) and lip surface elasticity were measured. Endogenous CER profiles and absorption levels of pCer in the stratum corneum (SC) were analysed in tape-stripped skin specimens.
- RESULTS : Treatment with the pCer-2.0% sample significantly improved the visual roughness score after 2 and 4 weeks compared to 0 weeks and compared to the Blank. Moreover, an improvement in TEWL was observed after 4 weeks of treatment with the pCer-2.0% sample. CER[NP] showed a significant increase in pCer-2.0% treated lips after 4 weeks compared to the Blank. Both pCer-0.5% and pCer-2.0% were significantly absorbed after 2 weeks compared with the Blank.
- CONCLUSION : The effect of the synthetic pseudo-ceramide pCer to improve the roughness of lips was shown excluding the effect of occlusiveness derived from the formulation for the first time. Since the improvement of TEWL and absorption of pCer was observed, we concluded that pCer was first absorbed in rough lip areas, improved the ceramide profile and consequently restored the barrier function.Note de contenu : - MATERIALS AND METHODS : Ethics - Subjects - Materials - Measurement of occlusivity - Degree of lip roughness - Biophysical measurements of the SC and measurement of surface elasticity - Tape stripping and lipid analysis by LC/MS - Ceramide measurement - Quantification of SC exfoliation protein - Calculation of ceramide quantitative value - Statistical analysis
- RESULTS : Changes in appearance score - Changes in SC functions and elasticity - Changes in ceramide profile - Changes in the amount of pCer absorption into the SCDOI : https://doi.org/10.1111/ics.12677 En ligne : https://drive.google.com/file/d/14CrdS_9PQCZFWZsO88j9A1l0_aG6uU_1/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35755
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 43, N° 2 (04/2021) . - p. 158-164[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire The roughness of lip skin is related to the ceramide profile in the stratum corneum / Eiko Tamura in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 38, N° 6 (12/2016)
[article]
Titre : The roughness of lip skin is related to the ceramide profile in the stratum corneum Type de document : texte imprimé Auteurs : Eiko Tamura, Auteur ; J. Ishikawa, Auteur ; A. Naoe, Auteur ; T. Yamamoto, Auteur Année de publication : 2016 Article en page(s) : p. 615-621 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Céramides Un céramide est un sphingolipide résultant de la combinaison d'un acide gras avec la sphingosine via une liaison amide. On trouve de telles molécules en abondance dans les membranes cellulaires, où elles entrent notamment dans la constitution des sphingomyélines. Les céramides ne jouent pas qu'un rôle structurel dans les membranes biologiques, et peuvent également revêtir des fonctions de signalisation lipidique. Leurs actions les mieux comprises vont de la différenciation cellulaire à la mort cellulaire programmée (apoptose) en passant par la prolifération cellulaire.
Les acides gras qui les constituent ont généralement un nombre pair (de 16 à 24) d'atomes de carbone, sont saturés ou monoinsaturés, et sont souvent α-hydroxylés.
La plupart des céramides n'existent pas à l'état naturel si ce n'est comme précurseurs de la biosynthèse des sphingolipides par une réaction d'addition sur la fonction alcool primaire de la sphingosine. (Wikipedia)
Couche cornée
Lèvres
Peau -- analyse
RugositéIndex. décimale : 668.5 Parfums et cosmétiques Résumé : Objective : The structure of skin on the lips is different from skin at other areas of the body; the water content of the stratum corneum (SC) and the barrier function there is low. Therefore, the lips can easily become dry and rough. The SC plays an important role in the barrier and water-holding functions of the skin. Above all, ceramides (CERs) are important SC lipids which maintain SC functions. The purpose of this study was to clarify the relationship between the degree of lip roughness and the CER profile.
Methods : Forty-one Japanese female subjects with normal skin (age range 22–52 years; mean 34.1) were enrolled in this study. The degree of lip roughness was scored, the values of capacitance and transepidermal water loss (TEWL) were measured and CER profiles of the SC were analysed using tape-stripping.
Results : The degree of lip roughness was related to the capacitance values but not the TEWL values. The roughness level correlated with the levels of CER[NH], CER[NP], CER[AH], CER[EOS] and CER[EOH] and the average carbon numbers of CER[NDS], CER[NH] and CER[NP] but not with the level of total CERs. The capacitance values of the lips were related not only with the levels of total CERs but also with the levels of CER[NH], CER[NP], CER[AH], CER[AP], CER[EOS], CER[EOH] and CER[EOP] and with the average carbon numbers of CER[NDS], CER[NS], CER[NH] and CER[NP]. The TEWL values of the lips were related not only with the levels of total CERs but also with the levels of CER[NH], CER[AH], CER[AP], CER[EOS] and CER[EOH].
Conclusion : The relationship between lip roughness and the CER profile was clarified for the first time. The results suggest that not only the level of total CERs but also the specific CER species and their carbon numbers affect the maintenance of SC function.Note de contenu : - MATERIALS AND METHODS : Ethics - Subjects - Biophysical measurements of the SC - Degree of lip roughness - Stratum corneum stripping and preparation of SC samples - Analysis of CER species - determination of average carbon numbers of CERs - Protein analysis - Statistical analysis
- RESULTS : Correlation between lip roughness scores and SC parameters - Correlation between lip roughness scores and CER profiles - Correlation between SC parameters and CER profiles
- DISCUSSION : Correlation between lip roughness and SC functions - Correlation betweenlip roughness and CER profiles - Correlation between SC functions and CER profilesDOI : 10.1111/ics.12335 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/ics.12335 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27539
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Code-barres Cote Support Localisation Section Disponibilité 18479 - Périodique Bibliothèque principale Documentaires Disponible