Abstract：
:Variable skin pH values are being reported in literature, all in the acidic range but with a broad range from pH 4.0 to 7.0. In a multicentre study (N = 330), we have assessed the skin surface pH of the volar forearm before and after refraining from showering and cosmetic product application for 24 h. The average pH dropped from 5.12 +/- 0.56 to 4.93 +/- 0.45. On the basis of this pH drop, it is estimated that the 'natural' skin surface pH is on average 4.7, i.e. below 5. This is in line with existing literature, where a relatively large number of reports (c. 50%) actually describes pH values below 5.0; this is in contrast to the general assumption, that skin surface pH is on average between 5.0 and 6.0. Not only prior use of cosmetic products, especially soaps, have profound influence on skin surface pH, but the use of plain tap water, in Europe with a pH value generally around 8.0, will increase skin pH up to 6 h after application before returning to its 'natural' value of on average below 5.0. It is demonstrated that skin with pH values below 5.0 is in a better condition than skin with pH values above 5.0, as shown by measuring the biophysical parameters of barrier function, moisturization and scaling. The effect of pH on adhesion of resident skin microflora was also assessed; an acid skin pH (4-4.5) keeps the resident bacterial flora attached to the skin, whereas an alkaline pH (8-9) promotes the dispersal from the skin.
journal_name
Int J Cosmet Scijournal_title
International journal of cosmetic scienceauthors
Lambers H,Piessens S,Bloem A,Pronk H,Finkel Pdoi
10.1111/j.1467-2494.2006.00344.xsubject
Has Abstractpub_date
2006-10-01 00:00:00pages
359-70issue
5eissn
0142-5463issn
1468-2494pii
ICS344journal_volume
28pub_type
杂志文章abstract：:The process leading to the loss of corneocytes form the skin surface is termed desquamation. In healthy skin it is an orderly and essentially invisible process whereby individual or small groups of corneocytes detach from neighbouring cells to be lost to the environment and replaced by younger cells from the deeper la...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1046/j.1467-2494.2000.00001.x
更新日期：2000-02-01 00:00:00
abstract：OBJECTIVE:The present investigation is based on the formulation of water-in-oil (w/o) cream preparations of ascorbic acid (AA) at pH 4-6 using different emollients and humectants. METHODS:The preparations were stored in the dark at 30°C for a period of 3 months and were studied for their chemical and physical stabilit...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/ics.12152
更新日期：2014-10-01 00:00:00
abstract：OBJECTIVE:The aim of the study was to develop formulations to deliver physiological lipids into skin in an attempt to repair defective barrier function. METHODS:Physiological cholesterol and linoleic acid were incorporated into basic cream and non-ionic cream to prepare skin repair formulations. Homogeneity and storag...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/ics.12491
更新日期：2018-10-01 00:00:00
abstract：:A novel ex vivo technique has been used to assess the sand/rub resistance of topical sunscreens. The technique is based on transmission spectrometry using excised human epidermis as the substrate. The sun protection factors (SPFs) of 10 sunscreen products were measured prior to, and after agitation with sand. It was f...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1046/j.1467-2494.2000.00027.x
更新日期：2000-10-01 00:00:00
abstract：OBJECTIVE:Cutaneous disorders can impact on the psycho-social well-being of children and adults alike, which has been reviewed elsewhere (Body Image 27, 2018 and 98). The present review sets out to evaluate progressions in skin masking and camouflaging techniques together with evaluating the efficacy of these. There do...
journal_title：International journal of cosmetic science
pub_type： 杂志文章,评审
doi：10.1111/ics.12575
更新日期：2019-12-01 00:00:00
abstract：OBJECTIVE:The objective of this study was to clarify the effects of different body washing methods on skin texture. METHODS:Subjects were nine healthy women in their 20s. Skin on the inside of the forearms was washed every day for 4 weeks with protective washing (right forearm) and with non-protective washing (left fo...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/ics.12114
更新日期：2014-04-01 00:00:00
abstract：OBJECTIVE:The objective of our research was to investigate the reduction mechanism of thioglycerol (TG) on hair keratin fibres. METHODS:The structure of cross-sections at various depths of virgin white human hair resulting from the permanent waving process with TG was directly analysed at the molecular level using Ram...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/ics.12429
更新日期：2018-02-01 00:00:00
abstract：:Sun exposure during leisure activity evokes fatigue. We employed the Advanced Trail Making Test (ATMT), a recently developed objective method of evaluating brain function performance used to measure mental fatigue, for objective determination of fatigue development caused by solar exposure to the human body. First, a ...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/j.0142-5463.2004.00200.x
更新日期：2004-02-01 00:00:00
abstract：:In the present contribution, the properties of dipropylene glycol isobornyl ether (Pribelance) are discussed, especially in the context of microemulsion and emulsion formulations. Pribelance is a new low-toxic anti-foaming hydrotrope with excellent co-surfactant properties that has some similarities with long-chain al...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/j.1468-2494.2008.00460.x
更新日期：2008-10-01 00:00:00
abstract：OBJECTIVES:Liposomes are commonly used in cosmetic formulations to increase the bioavailability of active ingredients. We have previously shown that polysaccharide coating of liposomes improves their resistance to surfactants and electrolytes. In the current study, we have assessed the impact of coating on the skin pen...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/ics.12394
更新日期：2017-08-01 00:00:00
abstract：:This paper examines the various methods that are available to the scientist working with natural materials to substantiate their efficacy. The methods discussed are: literature surveys, clinical trials, instrumental measurement, products with Pharmaceutical Licenses, comparison with other plants containing same active...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1046/j.1467-2494.2000.00015.x
更新日期：2000-08-01 00:00:00
abstract：:The color and odor of cosmetics have been shown to be crucial for affective states and able to influence autonomic responses. We report an original procedure to measure the effect on subjects of the color and odor of cosmetic products, and to quantify the correlation between objective (psychophysiological recording) a...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/j.1467-2494.2003.00196.x
更新日期：2003-12-01 00:00:00
abstract：:Sweat and skin surface pH are critical parameters in determining the performance of antiperspirants. The mechanism of action, the so-called 'plug theory' first proposed by Reller and Luedders, involves the expression of eccrine sweat onto the surface of the skin into which the solid antiperspirant salts, typically an ...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1046/j.1467-2494.2001.00092.x
更新日期：2001-08-01 00:00:00
abstract：:Synopsis Wound healing involves the activity of epithelial cells and fibroblasts. This process is particularly accompanied by an increase in the proliferative capacity of the fibroblasts and by the biosynthesis of constitutive proteins of connective tissue. To study the action of wound healing drugs on the growth of f...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/j.1467-2494.1984.tb00358.x
更新日期：1984-02-01 00:00:00
abstract：:Synopsis A technique was developed to evaluate the relative slip of ten test talcs and two control talcs (one with known good slip and one with known poor slip properties). The study was conducted under double-blind conditions with a naive panel of 19 subjects, who with minimal training ranked the 12 talcs. The rankin...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/j.1467-2494.1992.tb00041.x
更新日期：1992-04-01 00:00:00
abstract：:Long cattle tendons were enzymatically disposed of lipoid and accompanying nitrogenous substances. Collagenous hydrolysate of average molecular mass M(a) = 0.830 +/- 1.206 kDa, suitable for application in skin and hair-care preparations, was obtained through hydrolysis by commercial protease (Bacillus subtilis) under ...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1046/j.1467-2494.2002.00151.x
更新日期：2002-10-01 00:00:00
abstract：:Synopsis The ability of baseline transepidermal water loss (TEWL) measurements to predict the response of healthy subjects to a standard soap chamber irritation insult was evaluated. Chambers containing surfactant solutions were applied to the forearms of normal volunteers for five consecutive days. TEWL was measured ...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/j.1467-2494.1986.tb00452.x
更新日期：1986-10-01 00:00:00
abstract：:On a daily basis, the skin is exposed to many environmental stressors and insults. Over a 24-h natural cycle, during the day, the skin is focused on protection; while at night, the skin is focused on repairing damage that occurred during daytime and getting ready for the next morning. Circadian rhythm provides the pre...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/ics.12572
更新日期：2019-12-01 00:00:00
abstract：:Synopsis The modifications of chemical reactivity induced in the human hair during its treatment with oxidative (H(2)O(2)) or reductive (HSO(3)Na) agents via a micellar or a microemulsion system have been investigated. For this purpose, phase diagrams of micellar solutions and microcmulsions with H(2)O(2) or NaSO(3)H ...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/j.1467-2494.1985.tb00404.x
更新日期：1985-06-01 00:00:00
abstract：OBJECTIVE:A novel microwave-assisted dispersive liquid-liquid microextraction (MADLLME) technique according to the solidification of a floating organic droplet (SFO) and graphite furnace atomic absorption spectrometry (GFAAS) used for the extraction and determination of lead ions in lipsticks and hair dyes made in diff...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/ics.12221
更新日期：2015-10-01 00:00:00
abstract：:Synopsis The dichlorophenyl-imidazoldioxolan elubiol is used for skin and hair care in subjects with oily skin or dandruff. A study was conducted in 14 men to evaluate by non-invasive methods the effect of long-term use of elubiol on the sebum output at the skin surface. Measures were made using the Sebumeter SM810 an...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/j.1467-2494.1996.tb00152.x
更新日期：1996-10-01 00:00:00
abstract：:The present investigation describes a comparative study for the design of innovative topical formulation for skin hydration. In particular, different colloidal forms based on lipidic components have been produced and characterized. Morphology and dimensional distribution have been investigated by means of electron mic...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/j.1467-2494.2007.00362.x
更新日期：2007-02-01 00:00:00
abstract：:Synopsis A rapid method has been developed in order to compare the photostability of several sunscreen agents incorporated in the same type of emulsion. Thin films of the different preparations were spread on quartz plates and irradiated with a solar simulator. Differences in energy distribution according to wavelengt...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/j.1467-2494.1988.tb00002.x
更新日期：1988-04-01 00:00:00
abstract：:Synopsis The principles on which stability tests are based are reviewed. The need to differentiate between product stability and product-container compatibility is emphasized. Recognition of this distinction is fundamental to the efficient organisation and execution of stability tests. Attention is also drawn to the d...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/j.1467-2494.1985.tb00423.x
更新日期：1985-12-01 00:00:00
abstract：OBJECTIVE:Quinoa (Chenopodium quinoa Willd.) is a seed crop rich in bioactive compounds including phytoecdysones (especially 20-hydroxyecdysone, 20HE), polyphenols, proteins and essential fatty acids. We previously reported a method to leach and concentrate quinoa bioactives into a complex phytochemical mixture termed ...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/ics.12185
更新日期：2015-04-01 00:00:00
abstract：OBJECTIVE:To evaluate wrinkle improvement and safety of a novel cosmetic dissolving microneedle patches loaded with two active compounds with different hydrophilicities, namely ascorbic acid and retinyl retinoate. METHODS:Clinical studies were performed on 24 Korean women for 12 weeks. Patients in group A were treated...
journal_title：International journal of cosmetic science
pub_type： 杂志文章,随机对照试验
doi：10.1111/ics.12115
更新日期：2014-06-01 00:00:00
abstract：OBJECTIVE:Recently, our group reported that extracts prepared from the Australian native plant Terminalia ferdinandiana Exell. are potent inhibitors of the growth malodorous bacteria with similar efficacy to triclosan and through these results, we highlighted a potential biological alternative to the current chemical a...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/ics.12567
更新日期：2019-10-01 00:00:00
abstract：OBJECTIVES:Quantification of stratum corneum (SC) protein levels from tape strippings is frequently used to investigate skin conditions, to correct for amounts of SC protein removed in SC biomarker studies and to determine distribution of topically applied ingredients. In recent years, a rapid and convenient method for...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/ics.12274
更新日期：2016-06-01 00:00:00
abstract：OBJECTIVE:In this study, the influence of three cosmetically relevant, priorly characterized vehicles on skin hydration, sebum content and transepidermal water loss was investigated. The chosen vehicles included a liposomal pre-formulation, a multiple W/O/W emulsion and a microemulsion gel. The in vivo effects of these...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1111/ics.12180
更新日期：2015-04-01 00:00:00
abstract：:Various models of reconstructed epidermis already provide useful tools for safety and efficacy assessment of cosmetic products. However, the majority of these in vitro models are composed of keratinocytes only. Recently, the introduction of melanocytes into epidermal reconstructs has considerably enlarged their field ...
journal_title：International journal of cosmetic science
pub_type： 杂志文章
doi：10.1046/j.1467-2494.1999.183571.x
更新日期：1999-02-01 00:00:00
