• The Korean Journal of Mycology
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• v.42 no.2
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• pp.144-149
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• 2014

Lentinula edodes liquid spawn growth under explosive aeration (supplying air with tiny bubbles) and soybean meal addition to liquid culture medium were investigated in terms of mycelial growth and residual free sugar content. The two treatments were effective for homogeneous culturing of mycelial spawn and for separating colonies during multiplication after an exponential growth period without limiting sustaining nitrogen nutrients. The mycelial growth and carbon dioxide concentration were greatest on the 13th day since the inoculation. At 12th day, however, free sugars were almost depleted in the upper part of the liquid medium. Total nitrogen content within precipitated mycelia was the highest at the 13th day. Chitin and sucrose contents in the mycelia were the highest at the 18th day, but ergosterol content became highest at 22 days. These results suggest that Lentinula edodes liquid spawn is ready in 18 days after inoculation.

• Animal cells and systems
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• v.10 no.4
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• pp.203-209
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• 2006

Azoles are widely used antifungal agents, which inhibit the biosynthesis of fungal cell-membrane ergosterol. In this study, using an amphibian follicle culture system, the effects of azoles on follicular steroidogenesis in frogs were examined. Itraconazole (ICZ), clotrimazole (CTZ) and ketoconazole (KCZ) suppressed pregnenolone ($P_5$) production by the follicles ($ED_{50};\;0.04_{\mu}M,\;0.33_{\mu} M,\;and\;0.91_{\mu}M$, respectively) in response to frog pituitary homogenates (FPH). However, fluconazole (FCZ), miconazole (MCZ) and econazole (ECZ) were not effective in the suppression of $P_5$ production. Not all the azoles examined suppressed the conversion of exogenous $P_5$ to progesterone ($P_4$) (by $3{\beta}$- HSD) or $P_4$ to $17{\alpha}$-hydroxyprogesterone ($17{\alpha}$-OHP) (by $17{\alpha}$-hydroxylase), or androstenedione (AD) to testosterone (T) (by $17{\beta}$-HSD). In contrast, CTZ, MCZ and ECZ in medium partially suppressed the conversion of $17{\alpha}$-OHP to AD (by C17-20 lyase) ($ED_{50};\;0.25{\mu} M,\;4.5{\mu}M,\;and\;0.7{mu}M$, respectively) and CTZ, KCZ, ECZ and MCZ strongly suppressed the conversion of exogenous T to estradiol ($E_2$) (by aromatase) ($ED_{50};\;0.02{\mu}M,\;8{\mu}M,\;0.07{\mu}M,\;0.8{\mu}M$, respectively). These results demonstrated that some azole agents strongly suppress amphibian follicular steroidogenesis and particularly, P450scc and aromatase are more sensitive to azoles than other steroidogenic enzymes.

• Preventive Nutrition and Food Science
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• v.9 no.4
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• pp.330-335
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• 2004

Changes in functional constituents of rice germ prepared using three different heat pretreatments: roasting, steaming and microwave heating, were determined and compared with those of non-treated rice germ. The yield of rice germ oil increased generally and then decreased with increasing time for all three heat pretreatments, although the yields of rice germ oil varied among the three heat pretreatments. There were no major differences in fatty acid compositions among the rice germ oils subjected to the three different heat pretreatments. Levels of $\alpha$-tocopherol in rice germ oil increased up to about 1.5 times at 3 min of roasting and microwave heating, compared to control, and then decreased with increasing treatment time, but $\alpha$­tocopherol concentrations in rice germ oil gradually decreased with increasing steaming time. The contents of three phytosterols ($\beta$-sitosterol, stigmasterol and ergosterol) decreased progressively with increases in roasting and steaming time, while concentrations of the three phytosterols increased up to - 15$\%$ with 3 min of microwave process as compared to control, and then decreased thereafter. Levels of $\gamma$-oryzanol in rice germ oil decreased gradually with increasing time during all three different heat pretreatments. However, levels of $\gamma$ -aminobutyric acid (GABA) in rice germ decreased gradually with increasing roasting time, while those of GABA increased greatly up to about 2 times after 10 min of steaming process, and then decreased slowly thereafter. During microwave heating, the contents of GABA increased at 3 min of treatment time and then decreased. These results suggest that microwave heating may be the most suitable processing method to preserve functional constituents in rice germ.

• The Plant Pathology Journal
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• v.36 no.6
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• pp.579-590
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• 2020

Botrytis cinerea, which causes gray mold disease in more than 200 plant species, is an economically important pathogen that is mainly controlled by synthetic fungicides. Synergistic fungicide mixtures can help reduce fungicide residues in the environment and mitigate the development of fungicide-resistant strains. In this study, we screened microbial culture extracts on Botrytis cinerea to identify an antifungal synergist for tebuconazole. Among the 4,006 microbial extracts screened in this study, the culture extract from Schizophyllum commune displayed the most enhanced activity with a sub-lethal dosage of tebuconazole, and the active ingredient was identified as schizostatin. In combination with 5 ㎍/ml tebuconazole, schizostatin (1 ㎍/ml) showed disease control efficacy against gray mold on tomato leaf similar to that achieved with 20 ㎍/ml tebuconazole treatment alone. Interestingly, schizostatin showed demethylation inhibitor (DMI)-specific synergistic interactions in the crossed-paper strip assay using commercial fungicides. In a checkerboard assay with schizostatin and DMIs, the fractional inhibitory concentration values were 0.0938-0.375. To assess the molecular mechanisms underlying this synergism, the transcription levels of the ergosterol biosynthetic genes were observed in response to DMIs, schizostatin, and their mixtures. Treatment with DMIs increased the erg11 (the target gene of DMI fungicides) expression level 15.4-56.6-fold. However, treatment with a mixture of schizostatin and DMIs evidently reverted erg11 transcription levels to the pre-DMI treatment levels. These results show the potential of schizostatin as a natural antifungal synergist that can reduce the dose of DMIs applied in the field without compromising the disease control efficacy of the fungicides.

• Korean Journal of Clinical Pharmacy
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• v.10 no.2
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• pp.62-67
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• 2000

Terbinafine has a primary fungicidal action mediated by squalene epoxidase inhibition. Treated fungi accumulate squalene while becoming deficient in ergosterol, an essential component of fungal cell membranes. Bioequivalence of two terbinafine tablets, $Lamisil^{TM}$ (Novartis Korea Ltd., Seoul, Korea) and $Mycosil^{TM}$ (Daewon Pharmaceutical Co., Ltd., Seoul, Korea), was evaluated according to the guidelines of Korea Food and Drug Administration (KFDA). Sixteen normal male volunteers ($20\sim29$ years old) were randomly divided into two groups and a randomized $2\times2$ cross-over study was employed. After oral administration of $Mycosil^{TM}\;or\;Lamisil^{TM}$ (125 mg terbinafine), blood samples were taken at predetermined time intervals and the serum terbinafine concentrations were determined using an HPLC method with UV/VIS detector. The pharmacokinetic parameters $(AUC_t,\;C_{max}\;and\;T_{max})$ were calculated and ANOVA was utilized for the statistical analysis. The results showed that the differences in $AUC_t,\;C_{max}\;and\;T_{max}$ between two tablets based on the $Lamisil^{TM}$ tablet were $-2.24\%,\;-7.68\%\;and\;2.92\%$, respectively. The powers %(1-\beta)\;for\;AVC_t,\;C_{max}\;and\;T_{max}\;were\;87.11\%,\;95.36\%\;and\;99.99\%$, respectively. Minimum detectable differences $(\Delta)\;and\;90\%$ confidence intervals were all less than $\pm20\%$. All these parameters met the criteria of KFDA for bioequivalence, indicating that $Mycosil^{TM}$ tablet is bioequivalent to $Lamisil^{TM}$ tablet.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2022.09a
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• pp.117-117
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• 2022

표고(Lentinula edodes (Berk.))는 담자균강 주름버섯목 느타리과 잣버섯속에 속하는 식용버섯으로 봄에서 가을에 걸쳐 주로 재배하며, 예부터 식용 및 약용으로 널리 이용되어져 왔다. 우리나라를 비롯하여 일본, 중국 등의 동남아시아 지역뿐만 아니라 최근에는 미국, 캐나다 및 네덜란드 등의 서구 나라에서도 관심이 높으며, 전 세계적으로 중요한 식용 버섯으로써 주목을 받고 있다. 표고는 혈중 콜레스테롤 수준의 감소, 항당뇨, 혈압조절, 면역증강, 간 보호 및 비만 억제 등의 다양한 생리활성이 밝혀져 있어 현대인의 식생활에서 수요가 더욱 증가되고 있는 추세에 있다. 버섯의 생육은 크게 균사의 생장과 자실체의 생육으로 구분되는데, 표고 균사의 배양 기간이 86~123일 정도 소요되며, 자실체의 생육 기간은 10~20일 정도로, 균사의 배양 기간이 훨씬 긴 것으로 나타났다. 버섯의 생육 단계에서 영양, 생식, 생장은 모두 수분으로부터 비롯되며, 생육 조건, 조도, 환기 정도 등에 따라 버섯의 품질은 상당한 차이를 보일 수 있다. 일반적으로 봄에 수확한 표고는 대가 짧고 단단하며 감칠맛이 풍부하며, 가을에 수확한 표고는 대가 길고 육질이 부드럽고 비교적 강수량이 높아 수분함량이 높은 것으로 알려져 있다. 이러한 현상은 표고의 수확 시기에 따라 기후, 온도, 강수량 등의 차이가 이화학적 특성에 큰 영향을 미치는 것으로 생각되어, 본 연구에서는 봄과 가을에 각각 표고를 수확하여 이화학적 특성 및 기능성성분을 비교하였다. 분석결과 가을에 수확한 표고가 봄에 수확한 표고에 비해 수분, β-glucan, ergosterol 그리고 ergothioneine 함량이 유의적으로 높게 나타나, 소재 개발 시에 경제적 경쟁력을 고려했을 때 가을에 수확한 표고 활용이 유리할 것으로 고려된다.

• Journal of Korean Society of Forest Science
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• v.104 no.3
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• pp.434-442
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• 2015

The process of cultivation and production of oak mushroom (Lentinula edodes (Berk.) Pegler) on sawdust surface beds were investigated. Sawdust surface bed cultivation is the method by which oak mushrooms are cultured and produced on sterilized sawdust surface bed without using bags. The bed was made by inoculating with 3 to 1 ratio of bed sawdust to oak mushroom mycelial inoculum. The sawdust bed medium with 65% water content was pasteurized at $65^{\circ}C$, inoculated with sawdust spawn and spread on the surface on vinyl film in cultivation shed. During 78 days of cultivation period, water content in the medium varied from 61 to 72%, its pH decreased from 5.6 to 3.9~4.6 and ergosterol concentration increased to $0.33{\sim}0.59{\mu}g/g$. $CO_2$ concentration in the medium rapidly increased to 8.06% in two weeks. In seven weeks the medium surface started browning and $CO_2$ concentration increased to about 5.63%. Until 11th week the $CO_2$ concentration was maintained at 6~7%. After removing the plastic cover on the bed for ventilation in 12 weeks, $CO_2$ within the bed reduced dramatically to 1.5%. In the cultivation shed the internal temperature was $7.1{\sim}29^{\circ}C$ and humidity was 27.3 to 100%, while bed temperature ranged $11.6{\sim}30^{\circ}C$. Oak mushroom fruiting started from late July, in 120 days after bed establishment in late March and continued for approximately 100 days until early December with eight cycles of irrigation treatment. The mushroom yield of the eight cycles were 288~352 kg during the 1st (7/29~8/4) to 3rd cycle (9/3~9/7), 800 kg at the 4th cycle (9/19~9/24), 1,296~1,853 kg during 5th (10/3~10/8) to 7th cycle (4.11~11/9) and 990 kg at 8th cycle (11/23~12/7). Total production was approximately 7.4 tons from 33.0 tons of oak sawdust medium, thus harvest efficiency of the mushroom production was approximately 22.4%.

• Journal of Korean Society of Forest Science
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• v.113 no.1
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• pp.73-87
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• 2024

Wolfiporia hoelen (Fr.) Y.C.Dai & V. Papp, commonly known as Poria cocos, is a significant traditional herb used for medicinal and culinary purposes Asian and European countries. Many studies have confirmed that the main components of W. hoelen have pharmacological activities and thatits extract has been shown to affect bone metabolism. This study aimed to the potential of a 50% ethanol extract of the sclerotium of W. hoelen for preventing and treating bone diseases. The ethanol extract was systematically fractionated using n-hexane, dichloromethane, and ethyl acetate. The dichloromethane fraction caused an approximately 29% increase in alkaline phosphatase (ALP) differentiation activity in C2C12 cells compared to the control. Four compounds isolated from this active dichloromethane fraction were identified through instrumental analysis and literature references as 3α-dehydrotrametenolic acid, ergosterol, pachymic acid, and dehydrotumulosic acid. All four compounds were evaluated at increasing concentrations (1, 3, 10, 30, and 100 μM) to determine their effects on ALP differentiation activity in C2C12 cells and RANKL-induced inhibition activity in bone marrow macrophages (BMMs), with a concurrent assessment of cytotoxicity at these concentrations. At a concentration of 3 μM, dehydrotumulosic acid caused a 160% increase in ALP activity, 24% higher than in the BMP-2 control. BMMs treated with dehydrotumulosic acid at concentrations between 10 and 100 μM showed a substantial 15-86% decrease in RANKL-induced inhibition activity compared to the control, with distinct patterns of RANKL inhibition and cytotoxicity observed at 10 μM. These findings suggest that the ethanol extract from the sclerotium of W. hoelen has potential to modulate bone-cell differentiation, while highlighting the possible benefits of dehydrotumulosic acid isolated from the dichloromethane fraction of W. hoelen for preventing and treating osteoporosis.

• Korean Journal of Microbiology
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• v.49 no.2
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• pp.191-194
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• 2013

The fresh fruit bodies of Pleurotus eryngii var. ferulae was irradiated with ultraviolet (UV)-B (280-320 nm) in order to increase vitamin $D_2$ contents, which was assayed using HPLC (Waters 1525, USA). The vitamin $D_2$ contents were $3.5{\mu}g/g$ after 3 min UV-B irradiation ($21.6KJ/m^2$) and $6.02{\mu}g/g$ after 5 min UV-B irradiation ($36KJ/m^2$), respectively, which showed the significant increase considering the vitamin $D_2$ content ($0.01{\mu}g/g$) before UV-B irradiation. This increasing effect was confirmed also for other edible mushrooms; Pleurotus eryngii, from $0.09{\mu}g/g$ to $2.75{\mu}g/g$ (3 min) and $5.21{\mu}g/g$ (5 min); Lentinus edodes, from $0.021{\mu}g/g$ to $3.02{\mu}g/g$ (3 min) and $3.78{\mu}g/g$ (5 min); Pleurotus ostreatus, from $0.19{\mu}g/g$ to $9.63{\mu}g/g$ (3 min) and $11.6{\mu}g/g$ (5 min). Although the original content of vitamin $D_2$ was the highest in P. ostreatus, the extent of increase by UV irradiation was remarkably high in P. eryngii var. ferulae.

• The Korean Journal of Community Living Science
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• v.18 no.1
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• pp.55-62
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• 2007

The purpose of this study was to determine the usefulness of Shiitake mushroom, which was rich in vitamin $D_2$ through UV irradiation. For the practical use, we prepared the cold buckwheat noodles using UV irradiated Shiitake mushroom powder and seaweed derived calcium. The time required to acquire $2.5 J/cm^2$ of UV was 30-45 minutes, when the mushrooms were disposed 18 cm below within 1 cm from the UV light. Among the texture profiles detected by texture analyzer, adhesiveness and chewiness were significantly influenced by addition of mushroom powder and/or calcium. Adhesiveness appeared in only 3% mushroom powder noodle, and chewiness was significantly decreased by both of mushroom powder and seaweed calcium. Shiitake powder lowered lightness(L) and yellowness(b), but these deminishing effect on L and B value were compensated with addition of seaweed clacium. With cooking, the value of L was increased and redness(a) and yellowness(b) were decreased in comparison with raw noodle. According to sensory evaluation, addition of Shiitake and calcium increased the preference scores of color and overall acceptance of cold buckwheat noodles, but flavor, taste and texture were not influenced by those ingredients. We concluded that addition of 5% Shiitake and/or calcium to cold buckwheat noodles might give advantages for born health without bad effects on characteristics of those noodles.