• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1999년도 동계 학술대회 논문집
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• pp.462-469
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• 1999

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 추계학술대회
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• pp.471-473
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• 2006

An object of the present study is to provide a hollow fiber membrane humidifier capable of improving the humidification efficiency while lowering the pressure loss, and is suitably usable for PEMFC(Polymer Electrolyte Membrane Fuel Cell). The performance of PEMFC is decisively dependent on the humidity of the electrolyte membrane(fluorinated membrane) and a humidifier plays an important role in moisturizing electrolyte membrane. Especially this humidifier is adaptable for lower price to promote the commercialization of fuel cell vehicles and is passive type to be power free and to be volumetrically optimized. In this research, we propose the substitutes for the expensive fluorinated materials and the optimum dry-jet wet spinning conditions of hollow fiber membrane to get the fuel cell humidifier. In addition to that we established the standard method of evaluating the moisturizing performance of the humidifier of various materials.

• International Journal of Advanced Culture Technology
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• 제8권1호
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• pp.236-242
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• 2020

In this paper, we present the improvement in low moisturizing ability and stability that existing skin softeners have due to the low oil content, by developing skin softener using nanoemulsion of phospholipid liposome, based on the properties of nanoemulsion in cosmetic formulation. In this study, two types of oil; dimethicone (DC 200/6cs) or medium chain triglyceride (MCT), and two kinds of lecithin; unsaturated or saturated were respectively applied to produce nanoemulsion. In the particle size analysis of nanoemulsion, the droplet size of nanoemulsion containing DC200/6cs and unsaturated lecithin was the smallest, and all nanoemulsion showed high stability in the measurement of zeta potential. Therefore, with the smallest particle size and high stability, moisture contents and trans epidermal water loss(TEWL) were measured using the skin softener of DC200/6cs and unsaturated lecithin contained nanoemulsion, and the measurement was compared with the non-oil skin softener and the skin softener with only small amount of oil. The results showed that the moisture content of the skin softener using nanoemulsion increased greatly than other two skin softeners, showing high hydration ability and water retention capacity, and TEWL decreased greatly, therefore preventing the evaporation of moisture from the skin. As a result, the oil content and stability of the skin softener was improved by utilizing nanoemulson based of phospholipid liposome, and it is expected to be used in various ways in cosmetic industry.

• 대한화장품학회:학술대회논문집
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• 대한화장품학회 2003년도 IFSCC Conference Proceeding Book I
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• pp.35-49
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• 2003

In this study, in an attempt to search for functional cosmetic ingredients from higher fungal, we have produced exopolysaccharides (GF-l, approximately carbohydrate 75％, protein 25％) and polysaccharide (GF-2) of mycelium extract, by submerged culture of Grifolafrondosa. For applications in anti-aging cosmetic field, we investigated the diverse biological activities. Antioxidant activity and inhibition of Matrixmetalloproteinases (MMPs) were investigated enzymatic assays by measuring the superoxide scavenging activity using xanthine-xanthine oxidase system and the proteolytic activity of MMPs using EnzChek Collagenase/Gelatinase kits, respectively. GF-l polysacchairde showed inhibition of superoxide radical by 90％ at a concentration of 0.2％ (w/v) and inhibition of collagenase by 45％ at 0.2％ (w/v). GF-2 polysaccharide of mycelium extract also exhibited good antioxidant activity. However, MMPs inhibition activity was relatively lower level compared to GF-l polysaccharides. The treatment of human dermal fibroblast (HDF) with GF-l and GF-2 polysaccharides increased the proliferation of fibroblast by approximately 23-25％ at a concentration of 0.5％ (w/v), also showed collagen synthesis increase in HDF by about 50％ at 0.5％ (w/v) compared to that of untreated control. We also report the moisturizing effects of polysaccharides in cosmetic products (O/W emulation) and its own ingredient, in vitro and in vivo. The GF-1 polysaccharide showed higher moisturizing ability than sodium hyaluronate, which is the most commonly used moisturizers ingredient. These results suggest the GF-l polysaccharide, protein-bound polysaccharide, may be used as an ingredient for new moisturizing and anti-aging cosmeceuticals.

• 대한화장품학회지
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• 제34권4호
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• pp.317-323
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• 2008

바이오계면활성제는 생물학적으로 박테리아나 효모 등에 의해 많은 기질로 부터 생산된다. 바이오계면활성제는 많은 다른 합성 계면활성제에 비해서 환경친화적이고 보다 효과적인 것으로 알려져 있다. 본 연구에서는 Candida bombiocola로부터 생성된 소포로리피드의 항균효과를 다양한 균에 대해서 시험하였다. 소포로리피드의 치아우식 원인균(S. mutans), 액취균(C. xerosis) 및 여드름균(P. acnes)에 대한 최소억제농도(MIC)는 각각 0.005, 0.05, 0.005% (w/v)이였다. 이러한 항균효과는 합성 계면활성제인 SLS나 APG에 비해 우수한 항균효과를 보였다. 소포로리피드를 함유한 제형에서의 각질박리와 보습 효과를 측정하였다. 0.25% 수용액의 소포로리피드는 5.0% 젖산 수용액과 동등한 수준의 각질박리효과를 보였으며 보습효과는 소포로리피드를 함유한 에멀젼 제형에서 농도 의존적인 경향을 보였다. 이러한 결과는 소포로리피드을 항균제나 보습 또는 각질박리제로서 화장품에 대한 사용 가능성을 제시한다.

• 한국콘텐츠학회논문지
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• 제15권1호
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• pp.324-330
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• 2015

초음파 전파 매개물은 초음파의 손실 없는 투과력을 위한 1차적인 목적 이외에 피부위에서 탐촉소자의 부드러운 이동을 위한 부가적인 목적이 있다. 본 연구는 진단용 초음파의 고분자 수화젤, 에멀전, 오일젤의 제형이 다른 초음파 전파매개물이 갖는 피부 윤활성, 피부 보습성, 건조속도 등의 초음파 매개물의 특징을 측정하여 이미 상용화 된 기성품과 비교하였다. 마찰계수는 고점도 에멀전에서 가장 높았으며 저점도 에멀전에서는 고분자 수화젤의 평균 마찰계수와 큰 차이를 보이지 않았다. 제제의 건조속도는 고분자 수화젤이 가장 높았으며 오일 함유량이 많을수록 수분증발이 나타나지 않았다. 피부수분함량에서는 저점도 에멀전이 높은 수분함량을 나타냈으며 수분함량 감소 정도가 가장 완만히 나타났다. 오일성분을 적절히 사용한 에멀전 형태의 초음파 전파매개물은 피부 보습효과, 피부 유연작용의 피부 건강측면과 피부-탐촉소자간의 피부 윤활성면에서 효과적인 제형임을 알 수 있었다.

• 한국응용과학기술학회지
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• 제35권2호
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• pp.560-567
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• 2018

화장품산업에서 보습 효과를 오랫동안 지속시키기 위해 보습제로 히아루론산, 글리세린 등 많은 원료가 개발과 연구되어지고 있다. 이번 연구에서는 보습제 원료가 아닌 계면활성제를 변경함에 따라 피부의 보습 및 경피수분손실량의 변화에 대해 연구 하였다. 특별히 계면활성제의 종류는 천연계면활성제, Lecithin 계면활성제, Polyglyceryl ester계열 계면활성제, PEG계열 계면활성제, PEG계열 W/O 계면활성제 등으로 이 들의 계면활성제의 변화에 따라 피부의 보습 및 경피수분손실량의 변화를 확인하였고, 계면활성제 중에서 Lecithin surfactant를 사용했을 때 가장 우수한 결과 값을 확인 하였다.

• 대한한의학회지
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• 제37권4호
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• pp.1-9
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• 2016

Objectives: The aim of this study was to solve skin moisturizing action mechanism issues of pomegranate concentrated solution (PCS) and dried pomegranate concentrate powder (PCP), at least partially. Materials and methods: In this study, ceramide and $TGF-{\beta}1$ contents with $TGF-{\beta}1$ mRNA expressions were analysis on the skin tissue homogenate samples after 56 days of continuous oral administration of PCS 1, 2, and 4 ml/kg, and PCP 100, 200 and 400 mg/kg. Results: Noticeable and dose-dependent increases of skin $TGF-{\beta}1$ contents and mRNA expressions were demonstrated in all PCP and PCS treated mice as compared with intact vehicle control, but no significant changes on the skin ceramide contents were demonstrated in all PCP and PCS treated mice as compared with intact vehicle control, in the current study. In addition, PCP 200 mg/kg showed similar increases of the skin $TGF-{\beta}1$ contents and mRNA expressions as compared to those of PCS 4 ml/kg. Conclusions: The presented results suggested that in vivo skin moisturizing effects of PCP and PCS after oral administration through up regulation of hyaluronan synthesis demonstrated in our previous results, may be possibly mediated by modulation of $TGF-{\beta}1$ expressions at least partially, without critical influences on the skin ceramide contents.

• 대한화장품학회지
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• 제48권1호
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• pp.71-76
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• 2022

본 연구에서는 화장품소재로서 락토바실러스 람노서스(Lactobacillus rhamnosus)로 발효된 유자발효물의 항산화 활성, wound healing, 보습 및 미세먼지 차단 효능을 조사하였다. 항산화 활성을 측정한 결과, 유자발효물에서 우수한 DPPH 라디칼 소거 활성이 있음을 확인하였다. 또한, 유자발효물은 scratch-induced wound healing 실험에서 무처리군 대비 세포 이동을 증가시키는 효과를 나타내었다. 유자발효물에서 보습 인자인 필라그린의 생성량이 증가하는 것을 확인하였다. PM₁₀으로 유도된 세포 자극에 대한 미세먼지 차단 효과를 확인한 결과, 유자발효물의 세포 보호 효과를 확인하였다. 이러한 결과를 바탕으로 유자발효물의 다양한 효과가 화장품원료 개발에 대한 과학적 근거를 제공할 수 있을 것으로 사료된다.

• 대한통합의학회지
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• 제10권3호
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• pp.27-36
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• 2022

Purpose : This study was aimed to analyze the effects of cosmetics containing Persicaria perfoliata water extract (PPWE) on the skin moisturizing and improvement of skin condition in clinical trials. Methods : Clinical trial was conducted for five weeks after IRB approval at Dong-Eui University. Out of a total of 64 people, 15 people each were assigned to four groups as follows; control group A, B, C and the experimental group A that using cosmetic containing PPWE. Skin condition was measured two times, before and after clinical trial, by a professional skin analyzer, SDM (skin diagnosis system). Moisture and oil value of participants was analyzed twice, each morning and evening, using a portable device on their cheeks. In addition, the survey was investigated subjective satisfaction on change in skin condition and the satisfaction on the use of cosmetics. Result : The experimental group exhibited subjectively significant changes before and after clinical trials on skin its dryness (p=.039), blush (p=.017), and redness (p<.001). In addition, subjective evaluation was also the highest satisfaction in aspects of number of application (p=.003), amount of application (p=.002), moisture maintenance, and skin scratching frequency. The satisfaction on the use of cosmetics was the highest in the intention to repurchase (p=.045), recommendation willingness to others (p=.020), and intention to use various products (p=.001). Skin moisture of the clinical trial participants using the SDM, moisture level and elasticity of the experimental group increased by 12.94 and 10.28. Moisture level, which was measured by a portable device, was the most potently increased in the experimental group. Conclusion : Consequently, PPWE containg cosmetics exhibited the effects of moisturization and attenuated skin dryness in clinical trials, which might be utilized as a fundamental data to develop numerous lines of cosmetics.