• Korean Journal of Fisheries and Aquatic Sciences
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• v.41 no.1
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• pp.7-12
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• 2008

To develop a whitening agent, cytotoxicity of the soluble collagen isolated from Todarodes pacificus (CIT) was evaluated. CIT tested for cytotoxicity on human dermal fibroblast (CCD-986sk) was exhibited very low cytotoxicity. Because tyrosinase is the key enzyme for melanin biosynthesis, the use of various tyrosinase inhibitors is a common practice for whitening purpose in cosmetics. Tyrosinase inhibitory activity and melanin production assay were measured to confirm the whitening effect. The inhibitory effect of MMP-1 in UV-irradiated human dermal fibroblast was also performed. CIT showed strong inhibition potency on tyrosinase by 51.5% at 0.2 mg/mL which increased the inhibition by increasing the concentration of CIT, and showed 69.1% inhibition at 1.0 mg/mL. CIT showed strong inhibition effect on melanin production with 82% at 1.0 mg/mL. The CIT also reduced about 76% expression of MMP-1 in UV-irradiated CCD-986sk cell at 1.0 mg/mL. From the preliminary observations, we suggest that the collagen isolated from CIT could be a potential source of natural skin-whitening and anti-aging agents for the photo-damaged skin.

• KSBB Journal
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• v.19 no.6 s.89
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• pp.437-440
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• 2004

To determine the inhibition of tyrosinase activity and melanogenesis, gardenia fruit was extracted initially with $95\%$ ethanol (w/v), The ethanol extract was fractionated subsequently with hexane, chloroform and ethyl acetate in that order. The inhibitory effect of the ethanol extract on tyrosinase activity was higher than water extract. When 10 mg/mL of ethyl acetate fraction was applied, the inhibition ratio of tyrosinase activity was much higher ($99.7{\pm}0.1\%$) than that of arbutin. The inhibition of melanogenesis using B16F10 melanoma cell, the ethanol extract also showed higher inhibitory effect than water extract. The highest inhibitory activity of melanogenesis was also shown in ethyl acetate fraction ($89.1{\pm}1.4\%$ at the cone. of $100\;{\mu}g/mL$). These results suggests that gardenia extracts might be used to be a potential agents for whitening.

• KSBB Journal
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• v.19 no.2
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• pp.118-124
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• 2004

Melanocytes synthesize melanin within discrete organelle termed melanosomes which are transferred to the surrounding keratinocytes and can be produced in varying sizes, numbers and densities. Skin whitening products have become increasingly popular in the past few years. The most successful natural skin whitening agents are: Arbutin, Vitamin C, Kojic acid, Mulberry, which are all tyrosinase inhibitors. In this work, melanoston, a melanogenesis inhibitor isolated from yeast was studied to understand its mechanism of melanogenesis inhibition. It was found that melanoston was not a tyrosinase inhibitor, while when melanoston was applied to the B16 melanoma cell culture media, the intracellular tyrosinase activity was decreased by more than 30％, When B16 melanoma was stimulated with ${\alpha}$-MSH, cell morphololgy was dramatically changed to have lots of dendrites on the cell membrane surface. On the other hand, B16 was treated with ${\alpha}$-MSH and melanoston, simultaneously, the change of cell morphology was not so great. This inhibition effect of melanoston was found to be related to the inhibition of intracellular activation and transportation of tyrosinase, which was observed by immunostaining of B16 melanoma using anti-tyrosinase antibody. From these results, melanoston was regarded as an inhibitor to the differentiation of melanoma cells.

• Korean Journal of Acupuncture
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• v.37 no.1
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• pp.24-30
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• 2020

Objectives : The purpose of this study was to investigate melanogenesis inhibition of ethanol extract of Polyporus (EP) by using B16F10 melanoma cells. Methods : We measured antioxidant effect of EP by using 1,1-Diphenyl-1-picrylhydrazyl (DPPH) assay and we confirmed melanin contents and tyrosinase activity of EP in cells. Additionally, the expression of tyrosinase-related protein-1 (TRP-1) and TRP-2 was observed by Western blot. Results : EP showed significantly high radical scavenging activity and inhibition of melanogenesis in dose-dependent manner by decreasing cellular tyrosinase activity and melanin content with or without α-melanin stimulating hormone. TRP-1 and TRP-2 expressions were also suppressed by EP in B16F10 cells. Conclusions : These results suggest that EP inhibits the melanogenesis and it could be a new organic ingredient for hyper-pigmentation.

• YAKHAK HOEJI
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• v.48 no.6
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• pp.374-378
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• 2004

To investigate the whitening activity of Laminaria japonicus, we measured the effect of hot-water extracts on melanin production in B16 melanoma cells. Melanocyte stimulating h ormone (MSH, $1{\mu}M$)-stimulated melanin production in B16 melanoma cells was significantly inhibited by fucoidan and hot-water extracts, but not by alginate. The purified tyrosinase activity was not affected by hot-water extracts, alginate and fucoidan. However, tyrosinase expression was significantly inhibited by fucoidan and hot-water extract in Western blot. These results suggest that inhibitory mechanism of hot-water extracts on melanin production may be due to the inhibition of tyrosinase expression but not to direct inhibition of tyrosinase, such an effect of which may be dependent on fucoidan.

• Proceedings of the SCSK Conference
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• 2003.09b
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• pp.479-479
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• 2003

We investigated the tyrosinase inhibitory effect using whitening materials such as arbutin, ethyl ascorbyl ether, glabridin, kojic acid, magnesium ascorbyl phosphate and ascorbic acid. Tyrosinase inhibition rate were determined varying the enzyme concentration, reaction time, reaction temperature and pH. The optimal conditions to measure the inhibitory efficacy were as follows. : enzyme concentration 1,500 or 2,000IU/mL, reaction time 15min(for the enzyme concentration 1,500 IU/mL) and l0min(for the enzyme concentration 2,000IU/mL), reation temperature 42$^{\circ}C$, pH 6.5. Under these conditions $IC_{50}$/ of arbutin, ethyl ascorbyl ether, glabridin, kojic acid, magnesium ascorbyl phosphate and ascorbic acid were calculated. In the case of magnesium ascorbyl phosphate, the inhibitory effect of tyrosinase was very low and the $IC_{50}$/ of magnesium ascorbyl phosphate could not be calculated. Other five materials showed good inhibitory effect of tyrosinase and can be used for the whitening materials.

• Journal of Korean Medicine Rehabilitation
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• v.21 no.1
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• pp.47-56
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• 2011

Objectives : This study was conducted to identify the antimicrobial anti-oxidative and tyrosinase inhibitory effect of three kinds of herbal plants, Polygonum cuspidatum, Chelidonii herba, Pharbitis nil L. naturally grown across the nation. Methods : To investigate in vitro anti-oxidative activity assay, antimicrobial effect and tyrosinase inhibitory activity, MeOH 80% extract, n-hexane, chloroform, ethyl acetate, n-butanol and water fractions of herbal plants were tested by diphenylpicrylhydrazyl(DPPH) method. Results : Bsutanol fractions of each plants showed about 90% on anti-oxidative effect. In case of tyrosinase activity, ethlyacetate fraction of Polygonum cuspidatum showed a potent inhibition effect. In the antimicrobial effect, ethylacetate fraction of Polygonum cuspidatu, hexane fractions of Chelidonii herba and the methanol 80% extracts of Pharbitis nil L. exhibited inhibition effect significantly. Conclusions : In MeOH 80% extracts, we couldn't found any extracts or fractions which have antimicrobial, anti-oxidative and tyrosinase inhibitory activity, however ethylacetate fractions of Polygonum cuspidatum showed effects commonly in these three assay system.

• Korean Chemical Engineering Research
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• v.50 no.4
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• pp.604-609
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• 2012

Properties of fucoidan used for functional cosmetic ingredients and the effect of fucoidan molecular weight on the cosmetic functions were studied. Fucoidan was extracted from Undaria pinnatifida sporophylls and molecular weight (35~160 kDa) of fucoidan was controlled by contact glow discharge electrolysis (CGDE). To test possibility of fucoidan as a cosmetics material, tyrosinase inhibition property, water-holding property, elastase activity inhibition property and DPPH free radical scavenging property were measured. Water-holding property of fucoidan was higher than that of hyaruronic acid, which is known as the one of the best water-holding material. The water-holding strength of fucoidan slightly increase as molecular weight of fucoidan decrease. Elastase activity inhibition (anti wrinkle effect) of fucoidan was higher than that of adenosine using standard material for anti wrinkle test. Optimum molecular weight of fucoidan to obtain highest tyrosin inhibition effect, elastase inhibition effect and radical scavenger effect is 100 kDa.

• Korean Journal of Plant Resources
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• v.26 no.5
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• pp.645-651
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• 2013

The contents of total phenolics and flavonoids, antimicrobial and tyrosinase inhibition activities of five growth stages with four greenhouse-grown cucumber extracts were investigated. Total phenolic content was high in Jangjukcheongjang, Janghyeongnakhap and five growth stage(24~27 cm). The content of total flavonoid did not differ between cultivar or growth stages. Among the four cucumber cultivars, the extract of Janghyeongnakhap showed a relatively strong antimicrobial effect against Staphylococcus aureus. The inhibition zone against Staphylococcus epidermidis of the samples tested in this experiment was 8~12 mm. And the antimicrobial effects against Malassezia furfur was high in Jangjukcheongjang, and showed the highest by the inhibition zone of 14mm in three(17~20 cm) growth stage. The tyrosinase inhibition activity of cucumber extracts showed relatively high activity in Jangjukcheongjang and Sinjoeunbaekdadagi, followed by Janghyeongnakhap. From these results, we confirmed that the extract of cucumber has high antimicrobial and whitening efficacy, and that in the future, the cucumber will be increase the availability in the field of high-value cosmetic materials.

• Journal of the Korean Applied Science and Technology
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• v.34 no.2
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• pp.296-304
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• 2017

The purpose of this study was to investigate the applicability of the Psidium guajava leaf extract as a whitening functional cosmetic material. We measured DPPH radical scavenging activity, intracellular ROS, cytotoxicity in B16F10 melanoma cells and cytoprotective effect on ultraviolet A, in vitro tyrosinase inhibitory effect and melanin biosynthesis inhibitory effect. The antioxidative effect was confirmed through high DPPH radical scavenging activity and intracellular ROS activity inhibition measurement of the Psidium guajava leaf extract. The survival rate of B16F10 melanoma cells was more than 98% at all concentrations, and the cytoprotective effect from ultraviolet ray A was found to increase in a concentration-dependent manner. In addition, in vitro tyrosinase activity inhibitory effect of 10% and melanin biosynthesis inhibitory effect of 20% were observed. Through less toxicity for B16F10 melanoma cell, high antioxidant activity, inhibition of tyrosinase activity and melanin biosynthesis inhibitory effect, we confirmed the possibility of developing the Psidium guajava leaf extract as a whitening functional cosmetic material with a safe and excellent whitening effect.