• 제목/요약/키워드: Sophorolipid

검색결과 19건 처리시간 0.024초

Enhanced Biodegradation of Contaminated Soil by Biosurfactant, Sophorolipid

  • Kang, Seok-Whan;Cho, Kwi-Joon;Kim, Eun-Ki
    • 한국지하수토양환경학회:학술대회논문집
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    • 한국지하수토양환경학회 1998년도 공동 심포지엄 및 추계학술발표회
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    • pp.178-182
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    • 1998
  • Bioremediation techniques have proved to be effective for restoring petroleum-contaminated soils. however some limitations still exist, especially biodegradation of hydrophobic organic compounds(HOCs) in soil is limited by their low solubility and sorption to solid surfaces. The principal objective of this study was to evaluate the effectiveness of biosurfactant sophorolipid on the biodegradation of hydrocarbons in soil. Experimental results showed that sophorolipid was not toxic to the HOC-degrading bacteria and enhanced biodegradation of HOCs in soil better than synthetic surfactants. when these models were treated with 1000mg/soil kg sophorolipid.

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Characteristics of Microbial Biosurfactant as an Antifungal Agent Against Plant Pathogenic Fungus

  • YOO DAL-SOO;LEE BAEK-SEOK;KIM EUN-KI
    • Journal of Microbiology and Biotechnology
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    • 제15권6호
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    • pp.1164-1169
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    • 2005
  • Characteristics of sophorolipid and rhamnolipid were evaluated as antifungal agents against plant pathogenic fungi. Eight percent of mycelial growth of plant pathogen (Phytophthora sp. and Pythium sp.) was inhibited by 200 mg/l of rhamnolipid or 500 mg/l of sophorolipid, and zoospore motility of Phytophthora sp. decreased by $90\%$ at 50 mg/l of rhamnolipid and $80\%$ at 100 mg/l of sophorolipid. The effective concentrations for zoospore lysis were two times higher than those of zoospore motility inhibition. The highest zoospore lysis was observed with Phytophthora capsici; $80\%$ lysis at 100 mg/I of di-rhamnolipid or lactonic sophorolipid, showing the dependency of structure on the lysis. In the pot test, the damping-off disease incidence ratio decreased to $42\%\;and\;33\%$ of control value at 2,000 mg/l sophorolipid and rhamnolipid, respectively. These results showed the potential of microbial glycolipid biosurfactants as an effective antifungal agent against damping-off plant pathogens.

락톤형 소포로리피드의 물리화학적 특성 및 항균효과 (Physico-chemical Properties and Antibacterial Activities of Lactonic Sophorolipid)

  • 조수아;엄경태;진병석
    • 공업화학
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    • 제30권3호
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    • pp.303-307
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    • 2019
  • 소포로리피드(sophorolipid)는 Candida bombicola에 의해 생산되는 당지질 구조의 생물 계면활성제로, 일반적으로 산성형과 락톤형의 혼합으로 존재한다. 본 연구에서는 소포로리피드 생산균주의 유전자조절과 대사공학적 방법을 통해 락톤형이 96% 이상으로 존재하는 소포로리피드의 물리화학적 특성, 항균 특성, 세포독성 등을 살펴보았다. 락톤형 소포로리피드를 물에 1 wt%에서 0.001 wt% 농도로 희석시키면 pH가 3.2~4.6 범위의 약산성을 나타내었다. 산-염기 적정곡선으로부터 락톤형 소포로리피드의 $pK_a$ 값은 대략 4.3으로 측정되었다. 임계 마이셀 농도(CMC)는 $10^{-2}wt%$로, 이때 수용액의 표면장력은 36 mN/m까지 감소하였다. 락톤형 소포로리피드의 항균 활성을 살펴본 결과, Propionibacterium acnes에 대하여 $1{\times}10^{-3}g/mL$, Corynebacterium xerosis에 대하여 $5{\times}10^{-3}g/mL$의 최소저지농도(MIC) 값을 보였다. MTT assay 실험 결과로부터 락톤형 소포로리피드의 세포독성이 트리클로산보다 10배 더 낮은 것으로 나타났다.

Production and Characterization of Antimicrobial Sophorolipids

  • Kim, Young-Bum;Kim, Gab-Jung;Kim, Eun-Ki
    • 한국생물공학회:학술대회논문집
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    • 한국생물공학회 2000년도 추계학술발표대회 및 bio-venture fair
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    • pp.220-223
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    • 2000
  • Sophorolipid, a glycolipid type biosurfactant produced from Candida Bombicola, inhibited the growth of bacteria and fungi. Between two types of sophorolipid, acid and lactone form, the latter had more strong antimicrobial activity. Culturing parameters including oil substrate, initial glucose concentration, aeration, culture mode, affected the ratio of two forms. The fatty acid moety varied depending on the oil having different fatty acid chains. Minimum inhibitory concentration of lactonic sophorolipid toward Propionibacterium acne was below 0.5ppm. This result indicated the potentials of sophorolipid as antimicrobial agent in various area including cosmetics.

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Dietary effects of sophorolipids on nutrient bioavailability and intestinal microenvironments in broiler chickens

  • Min-Jin, Kwak;Min Young, Park;Ki-Peum, Sung;Hanbae, Lee;Kwang-Youn, Whang;Younghoon, Kim
    • Journal of Animal Science and Technology
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    • 제64권6호
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    • pp.1092-1104
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    • 2022
  • Using antibiotics as growth promoter has been banned in poultry feed industry, thus various researchers try to seek an alternative to replace the growth-promoting antibiotics. In this study, we aimed to evaluate the growth performance via intestinal nutrient utilization and cecal microbial composition of broiler after dietary supplementation with most commonly using antibiotics, zinc bacitracin, and sophorolipid. A total of 180 1-day-old chicks were randomly assigned, and dietary treatment was as follow: CON, basal diet; ZB, 100 ppm of zinc bacitracin supplemented diet; and SPL, 250 ppm of sophorolipid supplemented diet. Their growth performance was evaluated and the samples of blood, small intestine, and ileal and cecal digesta were collected for biochemical, histological, and genomic analyses. The body weight and average daily gain of 7-day-old chicks were higher in ZB and those in overall experimental period were improved by ZB and SPL supplementation (p < 0.05). Their intestinal characteristics were not affected by dietary treatments in duodenum and ileum. Nonetheless, villus height was increased by SPL supplementation in jejunum (p < 0.05). Moreover, dietary SPL supplementation could down-regulate the expression level of pro-inflammatory cytokine, IL-1β (p < 0.05). mRNA levels of lipid and protein transporters did not differ among the treatments, however, relative expression levels of carbohydrate transporters, GLUT2 and SGLT1 were increased in broiler chicken's jejumum fed zinc bacitracin and sophorolipid supplemented diets (p < 0.05). Dietary zinc bacitracin supplementation could increase the population of Firmicutes in phylum level, and the portion of Turiciacter in genus level. On the other hands, the portion of Faecalibacterium was increased by dietary SPL supplementation compared to the other treatments. Our findings suggest that SPL supplementation improves growth performance through enhanced carbohydrate utilization capacity via improvement of gut morphological status and modulation of the cecal microbial population of broilers.

Ex-situ 토양세척기법에 의한 소수성 유기오염물질로 오염된 토양의 정화에 관한 연구 (A Study on the Cleanup Process of HOCs-Contaminated Soil by Ex-situ Soil Washing Technology)

  • 최상일;류두현;장민
    • 한국토양환경학회지
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    • 제2권1호
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    • pp.99-107
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    • 1997
  • 본 연구에서는 일련의 회분식 규모의 실험을 통해 소수성 유기오염물질로 오염된 토양에 토양세척기법을 적용함에 있어서 필요한 최적의 운전조건을 도출하고 세척후 분리된 상등액중에 포함된 유기오염물질 및 세척제를 유기용매를 이용하여 효율적으로 분리.회수하기 위한 방안을 모색하고자 하였다. 사용된 계면활성제는 토양과 결합될 우려가 적은 비이온계 계면활성제중 독성이 거의 없으며 국내에서 대량 생산되어 수급이 원활한 계면활성제를 선별하여 소수성 유기오염물질인 n-dodecane(4,000mg/kg dny Soil)으로 오염된 토양에 대해 세척시간, 계면활성제 용액의 농도, 진탕비, 온도 등에 따른 세척효율의 변화를 조사하였다. 실험결과 계면활성제의 HLB(hydrophile-liphophile balance)값이 MSR(molar solubility ratio) 값과 함께 토양세척시 중요한 변수로 작용하였다. HLB값이 낮아 유탁액을 형성하지 못하는 OA-5나 sophorolipid는 10% 이내의 극히 낮은 세척효율을 보였다. 그러나 안정된 유탁액을 형성하는 HLB값 범위내에서는 소수성 유기오염물질에 대한 액상실험에서의 용해도가 큰 계면활성제가 유리하였다. 높은 HLB값을 갖는 OA-14는 OA-9 보다 안정된 유탁액을 형성하지만 용해도에 대한 지표인 MSR값이 OA-9보다 작아 약 20%정도의 낮은 세척효율을 보였다. 안정된 유탁액을 형성하는 동시에 용해도가 높은 OA-9용액이 단독으로 쓰일 때는 최대 60%정도의 세척효율을 보였다. 또한 OA-9세척유출수로부터 유기용매인 벤젠을 이용하여 anthracene을 회수하고자 하는 경우, 세척유출수의 온도를 $30^{\circ}C$, pH는 2로 조절하는 것이 회수 효율 측면에서 바람직하다.

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Sophorolipid의 항균효과와 화장품에의 응용 (Antimicrobial Activities of Sophorolipids and Its Application for Cosmetics)

  • 조완구;박효순;안병준
    • 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.

생체계면활성제 소포로리피드의 생합성과 계면 특성 (Biosynthesis and Interfacial Properties of Sophorolipids As a Biosurfactant)

  • 강창범;류경임;임경희
    • 한국응용과학기술학회지
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    • 제17권4호
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    • pp.213-225
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    • 2000
  • Sophorolipids were biosynthesized using a strain of yeast, Torulopsis bombicola ATCC22214. It has been reported that this yeast gives the highest yields for the production of biosurfactant sophorolipids. Hence, this yeast was used in this study. One of the objectives of this study is to increase the yield of the sophorolipid synthesis. To meet this end, basic culture medium was formulated on the basis of literature research to-date. When this medium was used, the increase in yield from 15% to 150% was observed compared to using the media in the literature. To examine how the interfacial characteristics of sophorolipids change with substrate, glucose (the first carbon source) was maintained in the media and after being cultured for three days, the second carbon sources such as alkanes, vegetable oils, alcohols or organic acids were added. The whole broth was extracted twice with ethyl acetate and the extract was analyzed by thin layer chromatograhy(TLC). After qualitative analyses by TLC, surface tensions of sophorolipids were measured by the Wilhelmy plate method and critical micelle concentration(CMC) was determined using these surface tension data. Also, interfacial tensions were measured by the spinning drop method and emulsions of the three-component water/decane/sophorolipid system were tested. Sophorolipids were effective and efficient in terms of surface tension reduction and CMC, but they were ineffective as emulsifiers because emulsions were separated within 30 minutes.

토양내 Phenanthrene의 생물학적분해에 미치는 계면활성제와 환경변수의 영향 (Effect of surfactants and Environmental Factors on the Bioremediation of Phenanthrene)

  • 류두현;최상일;김광수
    • 한국토양환경학회지
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    • 제3권2호
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    • pp.115-125
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    • 1998
  • 오염된 토양 중 phenanthrene의 분해에 미치는 비이온계 계면활성제와 생물계면활성제의 영향을 살펴보았다. 비이온계 합성 계면활성제로 polyoxyethylene oreyl esterC$^{17}$ H$^{33}$ COO($C_2$$H_4$O)nH) 와 생물계면활성제인 sophorolipid를 적용하였다. 계면활성제의 농도, 수분함량, 접종균 처리 방법 및 종류, pH, 온도, 부가영양분 등의 변수들이 phenanthrene의 생분해에 미치는 영향을 비교실험 하였다. 계면활성제 농도가 CMC이하의 경우 계면활성제는 phenanthrene의 생분해성을 촉진하였으나, CMC 값 이상의 영역에서는 계면활성제가 미생물의 phenanthrene분해작용을 저해하였다. 30%의 수분함량과 pH 7, $30^{\circ}C$에서, 부가영양분으로 glucose를 10g/L수준으로 첨가하였을 때 좋은 분해도를 나타내었다. 충진제로 짚이 첨가되는 경우 토양 : 짚의 중량비가 5:2이고, 수분함량이 50%인 경우 phenanthrene의 분해가 촉진되었다.

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