In this study, Bacillus velesensis TJS119, isolated from freshwater, demonstrated growth inhibition against insect pathogenic fungi. The culture medium of the B. velezensis TJS119 strain underwent sequential fractionation with n-hexane, chloroform, ethyl acetate, n-butanol, and water. Notably, the n-butanol fraction exhibited significant antifungal activity against Metarhizium anisopliae and Beauveria bassiana. LC/MS analysis of antifungal peaks identified the production of various lipopeptides by B. velezensis TJS119, including two types of iturin A (C14, C15), four types of fengycin A (C14, C15, C16, C17), and two types of fengycin B (C16, C17). The antifungal efficacy of Iturin A and Fengycin against insect pathogenic fungi was further validated using the paper disc diffusion method. These findings underscore the potential of B. velezensis TJS119 as a promising candidate for future research and applications in the realm of agricultural biological controls against fungal diseases.

In this study, we analyzed the antifungal activities of five essential oils (clove, rosemary, thyme, basil, and oregano) against three fungi (Penicillium oxalicum, Penicillium commune, and Cladosporium cladosporioides) isolated from farm-type fermented meat products Though their antifungal activities differed for each fungus, thyme had the greatest effect. Notably, C. cladosporioides showed the highest sensitivity to essential oils, and growth inhibitory effects were greater than for the other two strains. Additionally, ABTS, DPPH, and FRAP analysis confirmed that the five essential oils studied had antioxidant activity. ABTS analysis showed that clove (75%) and oregano (75%) oils had the highest antioxidant activities (both 93.7%). DPPH analysis showed that clove (75%) and rosemary (75%) oils had significantly greater antioxidant activities (both 93.8%) than thyme, basil, or oregano oils. FRAP results indicated that clove and basil oils were the strongest reductants. Comprehensive comparative analysis indicated that clove oil had more antioxidant activity than the other four essential oils. Overall, the study shows that the excellent antifungal properties of clove oil could be harnessed to produce safe fermented meat products by preventing rancidity and mold contamination.

The antifungal activity of cork tree extract against three plant pathogenic fungi (Colletrotrichum gloeosporiodes (Penz.) Penz. & Sacc., Pythium ultimum Trow. and Botrytis cinerea Pers.) was investigated antifungal active substances were identified. Cork tree extract showed concentration-dependent antifungal activity against three plant pathogenic fungi. The cork extract had antifungal activity in a concentration-dependent manner, and in particular, showed the most vigorous antifungal activity against Botrytis cinerea. In cork tree extract, the incidence of strawberry powdery mildew fungus after 7 days of treatment was significantly lower as the treatment concentration increased. Control value against strawberry powdery mildew fungus was 49% of cork tree extract, 69% of berberine chloride, and 67% of berberine bromine, which was lower than 80.5% of Rifzol, a representative antifungal compound, but showed strong antifungal activity. The isolated compound and berberine derivative showed similar effects to Rifzol at the treatment concentration (75 μg/ml), and a concentration of at least 10 μg/ml of fresh weight showed a preventive effect against strawberry powdery mildew fungus. Fractions showing antifungal activity were obtained by TLC, and each fraction was examined for the antifungal activity to obtain fractions showing antifungal activity against three types of pathogenic fungi. The compound isolated through TLC analysis was analyzed by HPLC equipped with an ODS column to obtain the main peak presumed to be berberine, which was confirmed as a berberine through 1H NMR analysis. The results of this study are expected to be utilized as biological pesticides with strong antifungal activity against plant powdery mildew etc.

흰점박이꽃무지 (Protaetia brevitarsis) 유충은 동아시아에서 식용 및 약용으로 널리 사용되고 있다. 흰점박이꽃무지 수요 증가로 인해 유충의 대량 사육 방법이 필요하지만 좁은 공간에서 대량으로 유충을 사육할 경우 곤충 병원성 질병 감염에 취약해진다. Metarhizium anisopliae는 흰점박이꽃무지 유충에 치명적인 곤충 병원성 곰팡이 중 하나이다. 이를 저해하기 위해 항진균 성분이 함유된 옻나무 (Rhus verniciflua Stokes) 추출액을 첨가하였고, 연구 결과 1% 옻나무 추출액을 첨가한 경우 녹강균에 의한 유충의 치사율이 유의미하게 낮았다. 또한 일반톱밥을 급여한 대조구에 비해 옻나무 추출액 처리구에서 유충의 무게가 더 무거웠고 유충 기간이 짧아 지는 것을 확인하였다. 따라서 이 연구를 통해 곤충 병원성 곰팡이에 대한 옻나무 추출액의 항진균 효과를 확인할 수 있었으며 흰점박이꽃무지 유충 사육 시 옻나무 추출액을 첨가 하여 급여한다면 병원성 곰팡이에 의한 유충의 치사율을 낮추고 증체량을 높이는 데 효과가 있을 것이다.

The present study investigated effects of antifungal and carboxylesterase inoculant on rumen fermentation with different rumen pH. Corn silage was treated without inoculant (CON) and with a mixed Lactobacillus brevis 5M2 and L. buchneri 6M1 (MIX). Rumen fluid was collected from two cannulated Hanwoo heifers before morning feeding (high rumen pH at 6.70) and 3 h after feeding (low rumen pH at 6.20). Dried corn silage was incubated in the rumen buffer (rumen fluid + anaerobic culture medium at 1:2 ratio) for 48 h at 39oC. Eight replications for each treatment were used along with two blanks. Both in a high and a low rumen pH, MIX silages presented higher (p<0.05) the immediately degradable fraction, the potentially degradable fraction, total degradable fraction, and total volatile fatty acid (VFA) than those of CON silages. Incubated corn silages in a low rumen pH presented lower (p<0.05) total degradable fraction, ammonia-N, total VFA (p=0.061), and other VFA profiles except acetate and propionate, than those in a high rumen pH. The present study concluded that application of antifungal and carboxylesterase inoculant on corn silage could improve degradation kinetics and fermentation indices in the rumen with high and low pH conditions.

누에는 약제, 면직, 식용, 동물 사료 등에 활용도가 높아 동아시아에서 오랫동안 사육되어 왔다. 뽕잎을 먹고 자란 누에가 사료를 먹고 자란 누에보다 생장주기가 일정하고 더 건강하게 생장한다는 것은 잘 알려진 사실이다. 또한 최근의 연구에 따르면 동물 장내 미생물이 동물의 면역과 생장에 큰 역할을 한다고 알려졌다. 이러한 사실로부터 뽕잎에 존재하는 미지의 미생물이 누에 생장과 면역에 관여할 수 있다는 가설을 세우고 이를 확인하기 위한 연구를 수행하였다. 뽕잎 내생균을 분리하기 위해 뽕잎을 5mm 크기로 잘라 표면살균 후, 배지에 치상하여 자라나오는 세균을 분리하여 동정하였다. 흥미로운 점은 100개 이상의 뽕잎 절편으로부터 동일한 세균이 검출되었으며 계통학적 분석을 통해 동정한 결과, Pseudomonas syringae pv. syringae(Pss)로 확인되었다. 또한, 뽕잎을 섭식한 누에의 장 속과 분변에서 이 균의 존재를 확인하였다. 누에에 병을 일으키는 곤충병원성 곰팡이에 대한 Pss의 항진균 효과를 확인하기 위해 곤충병원성 곰팡이인 Beauveria bassiana, Cordyceps militaris와 식물병원성 곰팡이 Botrytis cinerea, Fusarium graminearum을 대상으로 대치배양을 통해 균사 생장 억제 정도를 확인하였다. 그 결과, 식물병원성 곰팡이의 생장 억제효과는 관찰되지 않았으나 곤충병원성 곰팡이의 생장이 50% 이상 감소되었다. 특히, 다량의 포자를 생성하여 곤충에 치명적인 병을 야기하는 B. bassiana의 균사 생장이 C. militaris에 비해 더 크게 감소하였을 뿐 아니라 Pss의 배양 추출물을 처리하였을 때 B. bassiana의 포자 발아가 지연되었다. 앞으로 누에 장 속에 안착한 Pss가 곤충병원성 곰팡이에 대한 면역력과 누에 생장에 미치는 영향을 확인해 볼 계획이며 이를 통해 건강하고 안정적인 누에 사육에 활용될 수 있는 미생물 제제를 만들고자 한다.

감귤(Citrus unshiu Marc.)의 곰팡이(Penicillium digitatum) 발병 억제를 위해 선행연구를 통해 개발된 grapefruit seed extract (GSE) 코팅제와 활성칼슘, 푸마르산, 그리고 미산성 전해수의 병합처리 방법을 개발하였고, 각각의 처리를 통해 항곰팡이 효과가 유의적으로 가장 높은 조건을 최적 병합처리 조건으로 결정하여, 저장 중 감귤의 품질특성과 항곰팡이 효과를 조사하였다. 감귤 시료는 0.2% 활성 칼슘 수용액(0.2% CaO/distilled water (w/w), CaO) 과 0.5% 푸마르산/미산성 전해수(w/w) 수용액(0.5% fumaric acid/ slightly acidic electrolyzed water (w/w), FS), 그리고 CaO와 FS의 혼합액(CaO-FS)으로 3종류의 처리를 하였다. 감귤은 각 처리용액 별로 3분간 침지세척한 후, 카나우바 왁스 대비 1.0% GSE (w/w)와 Tween-80 (25% w/GSE w)을 혼합한 코팅액(GSE 코팅)으로 코팅되었다. 각 처리용액과 GSE 코팅을 병합처리한 결과, CaO-GSE 코팅의 항곰팡이 효과가 유의적으로 높아 최적 병합처리조건으로 결정되었다(p<0.05). 무처리구, GSE 코팅, 그리고 CaO 처리 후 코팅한 감귤(CaO-GSE 코팅)은 4°C에서 35일, 25°C에서 14일간 저장되었다. 25°C에 저장된 CaO-GSE 코팅은 무처리구와 GSE 코팅보다 감귤의 P. digitatum 생장을 효과적으로 억제하였다(p<0.05). 또한 CaO-GSE 코팅은 저장온도에 관계없이 감귤의 경도에 영향을 주지 않았고, 25°C에 저장 했을 시, 무처리구에 비해 유의적으로 높은 경도를 유지하였다(p<0.05). CaO-GSE 코팅은 저장온도와 저장일자에 관계없이 무처리구와 GSE 코팅에 비해 호흡률이 낮았고, 저장 중 감귤의 당도, pH는 무처리구와 유의적으로 비슷한 경향을 보였다. 저장기간에 관계없이 CaO-GSE 코팅의 적정산도는 4°C에서 무처리구와 유의적인 차이가 없었으나, 25°C에서는 무처리구보다 유의적으로 높았다. 저장기간 동안 감귤의 색도 중 명도와 적색도는 저장기간, 저장일자, 그리고 처리여부에 관계없이 저장기간 동안 모든 시료에서 유의적인 차이가 없는 것으로 보였으나, GSE 코팅과 CaO-GSE 코팅의 황색도는 저장일자가 길어질수록 무처리구에 비해 유의적으로 감소하였다. 반면에, 감귤의 아스코르브산 농도, 총 페놀 함량, 항산화능은 모든 온도에서 총 저장기간 동안 CaO-GSE 코팅이 GSE 코팅보다 지속적으로 높게 유지되었다. 그러므로 본 연구에서 개발된 CaO-GSE 코팅은 저장 중 감귤의 P. digitatum 생장억제와 저장 중 감귤의 품질을 유지시켜 감귤의 저장성 증대에 기여할 것이다.

The aim of this study was to examine the effects and the sensitivity of antifungal therapy for patients with oral candidiasis and to investigate the relationship among the signs & symptoms of patients and the ratio change of Candida species to antifungal therapy. Candida fungus culture test with ChromeIDTM Candida agar (CAN2) was carried out more than twice for 10 patients who visited Oral Medicine department of Chonnam National University Dental Hospital during the period from Dec. 2015 to Aug. 2016. After culturing the smear sample before and after antifungal therapy in ChromeIDTM Candida agar (CAN2), the number of colonies was counted to compare. Patients were divided into 5 group according to the therapeutic effects of the antifungal agents used: 1) high susceptibility to nystatin, 2) low susceptibility to nystatin, 3) high susceptibility to fluzonazole, 4) low susceptibility to fluzonazole, and 5) increased ratio of new Candida species. Although nystatin is used as first-line therapy in oral candidiasis, it is desirable to use fluconazole if patients had a history of the low sensitivity to nystatin or chemotherapy. Even if the patient's symptoms and signs are improved, there is a possibility of oral candidiasis recurring, so that clinicians should be careful during the treatment with antifungal agents.

Lactic acid bacteria (LAB) producing phenyllactic acid (PLA), which is known as antimicrobial compound, was isolated from button mushroom bed and the isolated LAB was identified to Lactobacillus casei by 16 rRNA gene sequence analysis. Cell-free supernatant (CFS) from L. casei was assessed for both the capability to produce the antimicrobial compound PLA and the antifungal activity against three fungal pathogens (Rhizoctonia solani, Botrytis cinerea, and Collectotricum aculatum). PLA concentration was investigated to be 3.23 mM in CFS when L. casei was grown in MRS broth containing 5 mM phenylpyruvic acid as precursor for 16 h. Antifungal activity demonstrated that all fungal pathogens were sensitive to 5% CFS (v/v) of L. casei with average growth inhibitions ranging from 34.58% to 65.15% (p < 0.005), in which R. solani was the most sensitive to 65.15% and followed by C. aculatum, and B. cinerea. The minimum inhibitory concentration (MIC) for commercial PLA was also investigated to show the same trend in the range of 0.35 mg mL-1 (2.11 mM) to 0.7 mg mL-1 (4.21 mM) at pH 4.0. The inhibition ability of CFS against the pathogens were not affected by the heating or protease treatment. However, pH modification in CFS to 6.5 resulted in an extreme reduction in their antifungal activity. These results may indicate that antifungal activities in CFS was caused by acidic compounds like PLA or organic acids rather than protein or peptide molecules.

The honeybee inhibitor cysteine knot (ICK) peptide acts as an antifungal peptide and insecticidal venom toxin. However, the ICK peptide from bumblebees has not been characterized. Here, we report the molecular cloning and antifungal activity of a bumblebee (Bombus ignitus) ICK peptide (BiICK). We identified a BiICK that contains an ICK fold. The BiICK was expressed in the epidermis, fat body, and venom gland of B. ignitus worker bees. A 6.7-kDa recombinant BiICK peptide was expressed in baculovirus-infected insect cells. Recombinant BiICK peptides directly bound to Beauveria bassiana, Ascosphaera apis, and Fusarium graminearum, but they did not bind to Escherichia coli, Paenibacillus larvae, or Bacillus thuringiensis. Consistent with this finding, BiICK exhibited antifungal activity against fungi. These results demonstrate that BiICK acts as an antifungal peptide.

식품부패미생물에 대한 정향추출물의 항진균력을 확인하고 유효성분을 분리한 후 그 구조를 확인하였다. 정향 추출물은 대표적인 항진균제인 메타중아황산칼륨 및 myconazole과 비슷한 항진균 활성을 나타내었다. 용매분획을 실시한 결과 hexane fraction이 가장 항진균활성이 높은 것으로 나타났다. 이 hexane 분획을 silica gel column chromatography를 통해 분리하여 항진균활성이 가장 큰 분획물인 JH-1, JH-2-1 및 JH-2-2을 분리하였다. 이들 화합물은 EI-MS 와 1H-NMR, 13C-NMR 결과로부터 활성물질의 구조를 동정하였으며 그 결과 JH-1은 eugenol, JH-2-1은 eugenol acetate 그리고 JH-2-2은 chavicol인 것으로 확인하였다.