• 생약학회지
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• 제44권2호
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• pp.182-187
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• 2013

This study was conducted to investigate glutathione S-transferase(GST) activity, tyrosinase inhibitory effect and elastase inhibitory effect in persimmon calyx(calyx of Diospyros kaki Thunberg) for screening of functional materials from natural products. As a result, EtOAc extract of persimmon calyx turned out to be having tyrosinase inhibitory effect and elastase inhibitory effect. The active constituents of tyrosinase and elastase inhibitory effect were isolated from EtOAc extract of persimmon calyx. Their structure of compounds were identified as ursolic acid and (-)-daucosterol by spectroscopic evidence, respectively.

• 생약학회지
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• 제42권1호
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• pp.89-97
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• 2011

This study was conducted to investigate tyrosinase inhibitory effect, hyaluronidase inhibitory effect and antioxidant activity by DPPH radical scavenging method on the MeOH extract of 50 species medicinal plant for screening of functional properties. As a result, Chaenomeles sinensis Koehne extract among 50 species medicinal plant turned out to be having tyrosinase, hyaluronidase inhibitory effect and antioxidant activity. The major component of tyrosinase and hyaluronidase inhibitory effect was isolated from EtOAc extract of Chaenomeles sinensis Koehne. And the component of antioxidant activity was isolated from n-BuOH extract of Chaenomeles sinensis Koehne. Their structure of compounds were identified as oleanolic acid and (-)-epicatechin by spectroscopic evidence, respectively.

• 약학회지
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• 제45권2호
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• pp.214-219
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• 2001

Nineteen hydrolysable tannins isolated from the Euphorbia helioscopia (Euphorbiaceae) were tested for the inhibitory effect on mushroom tyrosinase activity in vitro. Inhibitory effect of gallotannin group exhibited more potent than that of phenolcarboxylic acid and ellagitannin groups against the enzyme activity. The inhibitory activity by pentagalloyl glucose on mushroom tyrosinase was more potent ($IC_{50}$/, 4.9 $\mu$M) than that of kojic acid ($IC_{50}$/, 8.7 $\mu$M).

• 한국축산식품학회지
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• 제32권5호
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• pp.678-684
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• 2012

본 연구는 tyrosinase 활성 저해효과가 있는 젖산균인 L plantarum M23 균주를 이용하여 멜라닌 형성을 억제하기 위한 최적 발효유 제조조건을 설정하는데 그 목적이 있다. 3수준 4인자 중심합성 계획법을 통해 실험설계하여 반응표면분석법을 사용하였다. 독립변수로는 yeast extract 농도(%, $X_1$), 포도첨가량(%, $X_2$), 배양온도($^{\circ}C$, $X_3$), 배양시간(h, $X_4$)을 설정하였고, 종속변수로는 pH(pH, $Y_1$), 종합적 기호도(score, $Y_2$)와 tyrosinase inhibitory activity(%, $Y_3$)를 설정하였으며, tyrosinase inhibitory activity가 가장 높고 pH는 4.4를 동시에 만족하는 최적화를 실시한 결과 yeast extract 농도는 0.13%, 포도 첨가량은 2.95%, 배양 온도는 $37.1^{\circ}C$, 배양 시간은 14.8 h일 때 예상되는 pH는 4.42, 기호도는 7.06, tyrosinase inhibitory activity은 86.65%이었으며, 실제 실험 결과 pH는 4.35, 기호도는 6.86, tyrosinase inhibitory activity은 84.05%로서 큰 차이를 나타내지 않았다. 이러한 결과를 토대로 melanin 생합성과정의 key enzyme인 tyrosinase을 활성억제하는 L. plantarum M23을 이용한 발효유는 피부의 미백 작용과 노화 억제 작용에 기여할 것으로 사료되었다.

• 생약학회지
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• 제46권1호
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• pp.84-92
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• 2015

Tyrosinase is a key enzyme to control the biosynthesis of melanin pigments and has two enzyme activities, namely of 1-tyrosine hydroxylase and of 1-dopa oxidase. Thus, tyrosinase is regarded as a target in skin-whitening and therapeutic intervention of local hyperpigmentation diseases. We have tested tyrosinase inhibitory activity on the water extracts of 50 species oriental medicinal plant. Among them, five medicinal plants, Linderae Radix, Clematidis Radix, Cinnamomi Cortex Spissus, Fritillariae Thunbergii Bulbus and Bulbus Fritillariae Cirrhosae were investigated strong inhibition effect. Five medicinal plants were fractionated using organic solvents (methylene chloride, ethyl acetate, n-butanol, water). Cinnamomi Cortex Spissus (ethyl acetate fraction) was investigated strong inhibition effect. Tyrosinase inhibitory activity below $IC_{50}\;40{\mu}g/ml$ is confirmed in five herbal plants that are Linderae Radix, Clematidis Radix, Cinnamomi Cortex Spissus, Fritillariae Thunbergii Bulbus and Bulbus Fritillariae Cirrhosae. Tyrosinase inhibitory levels ($IC_{50}\;{\mu}g/ml$) of each plants were 15.56, 35.02, 25.14, 15.20 and 39.77. We also investigate the effect of effective plant's fraction. in dose of $100{\mu}g/ml$, Cinnamomi Cortex Spissus (P-36) EtOAc fraction significant inhibitory effect over 50%. Clematidis Radix (P-35) and Cinnamomi Cortex Spissus (P-36) MC fraction inhibit tyrosinase each 36.60% and 43.21%. inhibitory rates of Fritillariae Thunbergii Bulbus (P-40) EtOAc and $H_2O$ fraction are 31.40% and 31.51%. Bulbus Fritillariae Cirrhosae (P-45) BuOH fraction regulate tyrosinase activity to 37.71%. We examined tyrosinase inhibitory activity of natural products and these results suggest that several herbs have potential as a new whitening material.

• 한국식품위생안전성학회지
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• 제12권3호
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• pp.195-199
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• 1997

For the purpose of isolation and screening of tyrosinase inhibitory activity from edible mushrooms, Pleurotus ostreatus, Auricularia auricula-Judae, Umbilicaria esculenta, Agaricus bisporus, Flammuline velutipes, Lentinus edodes, Ganoderma lucidum, and Coriouls versicolor were examined by tracing inhibitory activities against tyrosinase, utilizing L-3,4-dihydroxyphenylalanine (L-DOPA) as a substrate. Among the eight edible mushrooms tested, Umbilicaria esculenta showed potent enzyme inhibitory activities above 7804% against tyrosinase in ethylacetate (EtOAc) extracts. Ganoderma lucidum and Agaricus bisporus showed inhibitory activities of 67.3% and 51.5% in water extracts. EtOAc extracts of Umbilicaria esculenta was fractionated from silicagel column chromatography and one fraction showed the most inhibitory activity of 60.9%. The three bands (Rf=0.38, 0.27, 0.19) were isolated from preparative TLC of the fraction for purification and identified as mixtures of orsellinate, methyl orsellinate, methyl lecanorate, and methyl gyrophorate by high pressure liquid chromatography (HPLC), ultravisible spectrophotometer (UV), mass spectrophotometer (Mass), nuclear magnetic resonance spectrometer (NMR).

• 생명과학회지
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• 제16권3호
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• pp.396-399
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• 2006

고구마(품종: 생미)추출액에 tyrosinase의 활성을 저해하는 저해 물질이 존재함을 확인하였으며, 고구마 추출물의 첨가농도를 증가시킬수록 tyrosinase 활성의 저해도가 증가하였다. 그리고 고구마 추출물에 존재하는 tyrosinase 저해제는 $95^{\circ}C$에서 20분간 열처리에 의하여 37.3%의 활성이 잔존하여 열에 비교적 안정하였으며, pH 5.0-7.0에서 가장 안정하였다. 그리고 고구마 추출물은 투석에 의하여 tyrosinase에 대한 저해활성이 유의적으로 감소하였으며, 따라서 고구마 추출물에 존재하는 tyrosinase의 저해활성은 저분자 물질로 추정된다.

• Journal of Microbiology and Biotechnology
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• 제19권7호
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• pp.681-684
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• 2009

This study was carried out to evaluate the inhibitory effect of Flammulina velutipes extracts on tyrosinase activity and to identify its biologically active component. The ethyl acetate and n-butanol extracts showed potent tyrosinase inhibitory activities. Subsequently, fractions of the n-butanol extract showed only a partial tyrosinase inhibitory activity. The most active compound of tyrosinase inhibitory activity was identified from the ethyl acetate extract as 1',3'-dilinolenoyl-2'-linoleoylglycerol (LnLLn) by comparing its mass, $^1H-$, and $^{13}C-NMR$spectral data with those previously reported in the literature. LnLLn showed tyrosinase inhibitory activity with an $IC_{50}$value of 16.1 ${\mu}g/ml$. These results suggest that the ethyl acetate extract of F. velutipes could be applicable for the development of a new whitening agent.

• 한국산학기술학회논문지
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• 제11권7호
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• pp.2522-2527
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• 2010

본 연구의 목적은 초음파 처리 키토산과 메일라드 반응액 혼합물에 의한 tyrosinase 억제 활성과 항균력을 조사하고자 하였다. 감자로부터 tyrosinase를 분리하여 SDS-PAGE후 일반 단백질 염색과 tyrosinase 활성 염색을 행하여 tyrosinase를 확인하였다. 여러 가지 당 (glucose, fructose, galactose, xylose, arabinose or ribose)과 cystein과의 반응으로 생성된 메일라드 반응 산물의 tyrosinase 억제 활성을 비교한 결과, glucose과 cystein 반응으로 생성된 메일라드 반응 산물의 tyrosinase 억제 활성이 가장 높은 것으로 나타났다. 0.5% 아세트산에 녹인 1% 키토산을 시간별로 초음파 처리한 후 항균력을 조사한 결과 1 시간 이상 초음파 처리한 경우 E. coli 균주 와 S. aureus 균주에서 억제 활성을 보였다. 갈변 억제 활성과 항균력을 가진 혼합물 제조를 위하여 초음파 처리 키토산과 메일라드 반응액을 혼합비를 달리하여 조사한 결과 부피 비로 1 : 1 로 혼합한 경우가 tyrosinase 억제 활성과 항균력이 가장 효과가 높은 것으로 조사되었다.

• 생약학회지
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• 제32권1호통권124호
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• pp.68-71
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• 2001

For the use of tannins in the whitening-effect cosmetics, inhibitory effect against tyrosinase activity was determined. Three condensed tannins including gallocatechin, gallocatechin 3',4'-di-O-gallate and epicatechin 3-O-gallate and three hydrolyzable tannins, 1,2,6-tri-O-galloyl-${\beta}$-D-glucose, 2,3-(S)-HHDP-D-glucose and pedunculagin showed 15-29% mild inhibitory effects against tyrosinase activity.