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A Square Wave Based Electrical Method for Human skin moisture Assessment

稀有金属材料与工程 2006年第A3期35卷 463-466页

作者： Guolin Zhou Yonggui Dong State Key Laboratory of Precision Measurement Technology and Instruments Dept. of Precision Instruments and Mechanology Tsinghua University Beijing 100084 China

The moisture content measurement of human skin is a significant way to assess skin conditions and diagnose diseases that influence skin *** necessity of evaluating the efficacy of a cosmetic product makes it important to improve the accuracy and reproducibility of the measurement.A pair of interdigitated gold electrodes was fabricated on the printed circuit board (PCB) substrate and utilized directly in contact with the measured skin.A square-wave voltage at a single frequency was applied to the electrodes and the corresponding response current was measured to get the equivalent impedance of human *** it's easy to generate and control a square-wave signal by digital electric circuits,this method is suitable to be used in the portable *** experimental results indicate that good repeatability and satisfied accuracy can be obtained by this method.

关键词： skin moisture content square wave skin impedance single frequency

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Extraction Process Optimization and Moisturizing Performance of Fucoidan from Sargassum fusiforme

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Medicinal Plant 2018年第3期9卷 21-24,30页

作者： Bingyue LIU Xue LIU Fengjuan WU Guangqun CAO Chen ZHANG Jie YANG The Key Laboratory of Food Colloids and Biotechnology Ministry of EducationSchool of Chemical and MaterialJiangnan University Infinitus (China) Co. Ltd.

[Objectives] The research aimed to optimize extraction process of fucoidan from Sargassum fusiforme( FSF) and study its moisturizing performance. [Methods]Extracting condition of FSF by cellulase hydrolysis-ultrasonic assisted extraction method was optimized. The influences of solvent p H,enzyme dosage,extraction temperature,cellulose hydrolysis time,ultrasonication time,and the ratio of material to liquid on FSF were investigated by single factor and orthogonal experiments. [Results] The optimum extraction conditions were as followings:p H,4. 5; enzyme dosage,1%; extraction temperature,40℃; cellulose hydrolysis time,2 h; ultrasonic time,15 min; and the ratio of material to liquid,1∶ 10( g∶ m L). Under the optimal condition,the extraction yield of FSF was 8. 50%,RSD = 2. 74%. The short-time hygroscopicity( within 8 h) of crude extract of fucoidan from S. fusiforme( CEFSF) was better than glycerin,butanediol,and sodium alginate,and the moisture retention capacity of 1% CEFSF aqueous solution was better than 1% butanediol or 1% sodium alginate,and was equal to 5% glycerin under relative humidity of 43% and 81%. The determination results of skin moisture content and transepidermal water loss rate( TEWL)showed that: 5% CEFSF solution had good moisturizing effect. [Conclusions]The research could provide certain reference for deep development of S. fusiforme.

关键词： Additive of skin-care cosmetics Fucoidan from Sargassum fusiforme Orthogonal test moisture retention skin moisture content Transepidermal water loss rate

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