• 제목/요약/키워드: cELISA

검색결과 678건 처리시간 0.028초

Competitive Indirect ELISA를 이용한 Bovine Myosin의 동결 변성도 측정 (Monitoring the Rate of Frozen Denaturation of Bovine Myosin by Competitive Indirect ELISA Method)

  • 김성배;이주운;박종흠;도형기;현창기;신현길
    • 한국식품과학회지
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    • 제30권4호
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    • pp.862-870
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    • 1998
  • Myosin과 그 subfragment인 S-1과 LMM를 항원으로 하는 간접경합 효소면역분석법(Ci-ELISA)을 이용하여 동결육의 변화를 연구함으로써 수입 냉동육과 국내산 냉장 한우육과의 차별화를 위한 기초 자료를 마련하기 위하여 본 연구를 실시하였다. 각 항체의 표준곡선을 작성하였으며 최적반응범위는 $4{\sim}125{\;}{\mu}g/mL$이었고, 검출한계는 $0.1{\;}{\mu}g/mL$이었다. 확립된 Ci-ELISA를 이용하여 각각 $-10^{\circ}C,{\;}-20^{\circ}C,{\;}-50^{\circ}C$, 그리고 $-80^{\circ}C$에서 동결 기간 동안의 변화와 해동과 재동결에 따른 변화를 측정하였을 때 동결 기간 중 anti-MWM IgG와 반응한 myosin은 비교구와 비교하였을 때 $-20^{\circ}C$에서 변성도가 가장 컸으며 $-50^{\circ}C$에서 가장 적게 변성되었다. 단백질 용해성의 변화와 myosin과 항체와의 면역 친화성을 비교하였을 때 용해성이 감소하는 속도보다 더 빠르게 myosin이 변성되는 것으로 판단되었다. Anti S-1 IgG의 면역 친화성의 변화는 anti-MWM IgG에서 얻은 결과와 비교하였을 때 전혀 다른 경향을 보였다. anti-MWM IgG는 면역 친화성이 1개월 이후 급격히 감소된 데 비하여 anti S-1 IgG는 그와 같은 큰 변화를 나타내지 않았다. 반복되는 해동과 재동결 처리에서 anti-MWM IgG는 myosin과의 반응에서 2회 해동시부터 공격한 반응성의 감소를 보였으며 6회 해동시에는 85%까지 반응력을 상실했다(P<0.05). 두 실험 조건에서 $-20^{\circ}C$의 처리구의 myosin이 가장 심한 영향을 받은 것으로 나타났다. Anti-LMM IgG는 anti-MWM IgG에서 얻은 결과와 매우 유사한 경향을 보였다. $-10^{\circ}C$$-20^{\circ}C$에서 처리된 우육의 myosin은 저온에서 처리된 시료의 그것보다 보다 약 $10{\sim}15%$ 정도 더 많은 변성을 보인 것으로 사료된다.

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기생충질환(寄生蟲疾患)의 면역혈청학적(免疫血淸學的) 진단(診斷)에 관한 연구(硏究) (Studies on the Seroimmunodiagnosis of Parasitic Diseases)

  • 임한종;이준상;주경환;엄기선;정명숙
    • 농촌의학ㆍ지역보건
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    • 제13권1호
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    • pp.41-59
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    • 1988
  • 우리나라에서 문제가 되고 있는 몇몇 기생충질환을 대상으로 각종의 혈청학적 진단법을 적용시켜 진단적 가치 및 의의에 대하여 검토하였다. 연구대상 기생충은 간흡충, 낭미충, Capillaria hepatica이었으며, 주로 간접 형광항체반응, ELISA, western blot등의 기법을 적용시켜 보았다. 결과를 요약하면 다음과 같다. 1) 간흡충증에 있어서 ELISA는 83.3%의 민감도를 나타낸 반면 폐흡층 및 조충과의 교차반응이 인정되었다. ELISA는 간접혈구응집반응, 간접형광항체 반응에 비해 우수한 성적을 보이고 있었다. 앞서 기술한 교차반응을 구별하고 항원-항체반응의 특이항원대를 알아보기 위해 실시한 western blot의 결과 59Kd band와 21K의 band는 간흡충감염자 혈청이외에는 반응하지 않아 종특이성이 있는 것으로 판단되었다. Praziquantel로 치료한 다음 18개월 후에 혈청 및 뇨를 이용하여 ELISA로 검사한 결과 OD치는 치료전의 약 1/2수준으로 감소하였고, 음전률은 60%에 이르렀다. 간접혈구응집반응을 이용할 경우 치료 18개월 후 80%가 음전되었다. 2) 낭미충증 진단에 있어서 간접형광항체반응은 95.8%(23/24) 민감도를 나타내었으며 내막에서 가장 강한 반응을 나타내었다. ELISA 역시 90.0%(36/40)의 높은 민감도를 나타내었으나 두 방법 모두에서 다른 기생충감염자 혈청과의 교차반응이 인정되었다. Western blot 에서 볼때 91, 63, 21Kd의 band가 종특이한 것으로 나타났으며, 이중 63Kd의 항원대가 일관성 있게 낭미충 감염 혈청과 반응하였다. 3) Capillaria hepatica 충란을 이용한 난주위침강반응 및 간접형광항체법에서 85.0%의 민감도를 나타내었으며, 초록색의 특이한 형광이 점막전주위 및 충란절단면의 내막에서 관찰되었다. 수용성충란항원을 이용한 ELISA에 있어서도 85.0%의 민감도를 나타내었다. 항체가 감염후 3~5주부터 급격히 상승하기 시작하여 9주부터 점차 감소되어 감염후 13주에는 음성으로 전환되었다.

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장티푸스의 혈청학적 진단에 효소결합면역측정법(Enzyme-linked Immunosorbent Assay)의 적용 실험 (Application of the Enzyme-linked Immunosorbent Assay to the Serodiagnosis of Typhoid Fever)

  • 계기식;김예흠;최강원;황응수;국윤호;이승훈;차창용
    • 대한미생물학회지
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    • 제18권1호
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    • pp.73-85
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    • 1983
  • The advantages of the enzyme-linked immunosorbent assay(ELISA) are its sensitivity and its simplicity in detecting IgM and IgG antibodies. For applying the ELISA to the diagnosis of typhoid fever, first of all, experiments were performed to determine which concentration of killed whole cell antigens and lipopolysaccharide(LPS) antigens of S. typhi(0.901 w) were optimally coated to the wells of the polystyrene and polyvinylchloride microplate, using the hyperimmune sera from rabbits against S. typhi. By using both kinds of antigens of S. typhi adsorbed to the ELISA microplate, the changing patterns of IgG and IgM antibodies in the sera from rabbits responding to the killed whole cell antigens of S. typhi(0901 w) during the prolonged immunization were serially traced by the ELISA. At the same time, the level of antibodies against S. typhi in sera fron patients with typhoid fever and from normal healthy persons were measured by the ELISA employing the killed whole cell antigens and LPS antigens as the coating antigens. The results obtained were summerized as follow: 1. The optimal concentration of the killed whole cell antigens, which were more easily adsorbed to the polystyrene plate than the polyvinylchloride plate, was $10^8cells/ml$ of carbonate buffer(pH. 9.6) on the wells of the polystyrene plate when treated at $37^{\circ}C$ for 4 hours. On the other hand, the optimal concentration of lipopolysaccharide antigens, which were adsorbed only to the polyvinylchloride plate, was $100{\mu}g/ml$ of carbonate buffer(pH. 9.6) on the wells of the polyvinylchloride plate when treated at $37^{\circ}C$ for 4 hours. 2. IgM antibody response were dominating in rabbits responding to the killed whole cell antigens of S. typhi(0.901 w), and were more specific to the LPS antigens than to the killed whole cell antigens in the ELISA. Good correlations were made between the IgM titers by the ELISA and the aggglutinating titers of sera from the immunized rabbits. 3. Both IgG and IgM agglutination titers by the ELISA in sera from most of patients with typhoid fever were above 1:320 but those in sera from most of normal, healthy persons were below 1:80. 4. There were close correlations between the antibody titers by the ELISA and the agglutinating titers to the killed whole cell antigens in the tested human sera, IgM titers being more correlated with the agglutinating titers than IgG titers. But a little correlations were made between the antibody titers by the ELISA and the agglutinating titers to the LPS antigens. 5. IgM titers in the tested human sera were similar to IgG titers detected by the ELISA employing the killd whole cells antigens and the LPS antigens. 6. Good correlations were made between the antibody titers demonstrated by the ELISA performed on the killed whole cell antigens and the LPS antigens as the different, coating antigens on the ELISA microplates.

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ELISA Inhibition Assay에 의한 Vinblastine의 측정 (Vinblastine Determination Measured by a Sensitive ELISA Inhibition Assay)

  • Jae Wha kim;Mi Young Han;Hee Gu Lee;Eun Young Song;Tai Wha Chung;Kyung Soo Nam;In Seong Choe
    • 대한의생명과학회지
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    • 제2권1호
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    • pp.121-126
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    • 1996
  • Vinblastine을 포함하는 bis-indole alkaloids에 대한 단일클론 항체를 생산하여 Vinca alkaloids의 양을 측정할 수 있는 간편한 immunoassay체계를 확립하였다. Vinca alkaloids는 periwinkle식물체의 배양된 세포로부터 추출하여 BSA와 접합한 후 Balb/c생쥐에 면역시켜 얻은 비장세포와 골수종양세포의 융합을 유도하여 VBL-BSA에 반응하는 클론을 ELISA 방법으로 분석하였으며 이들 클론 중 bis-in-dole alkaloids와 특이적으로 반응하는 항체는 inhibition assay를 통하여 분리할 수 있었고 그 결과 두개의 단일클론 항체를 형성하는 세포주(KN-1과 KN-2)를 확립하였다. KN-1의 경우 dimeric bis-indole alkaloids 와는 상당한 교차반응을 나타낸 반면 monomeric bis-indole alkaloids 와는 교차반응을 나타내지 않았으며 이 클론의 항체를 이용하여 배양된 세포 추출물에 포함된 Vinca alkaloids의 양을 측정한 결과 0.05 nM정도의 dimeric Vinca alkoloids까지도 측정할 수 있었다.

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참마와 명아주의 항산화 및 항염증 효과 (Antioxidant and Anti-inflammatory Effects of Dioscorea japonica and Chenopodium album)

  • 김신애;최수철;윤영한;고창인;하영순;이인아
    • 대한화장품학회지
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    • 제43권4호
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    • pp.337-347
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    • 2017
  • 본 연구에서는 참마와 명아주의 항산화 및 항염증 효능을 평가하기 위해 참마와 명아주 에탄올 추출물을 이용하여 free radical 소거활성, enzyme-linked immunosorbent assay (ELISA) 실험을 수행하였다. 참마와 명아주 추출물의 free radical (1,1-diphenyl-2-picrylhydrazyl, DPPH) 소거활성($EC_{50}$)에서 각각 2.386, 0.524 mg/mL로 측정되었다. 또한 참마와 명아주 추출물의 혼합 시료의 free radical 소거활성은 참마 추출물:명아주 추출물 비율이 2:1일 때 가장 뛰어난 것으로 나타났다. IL-6와 $TNF-{\alpha}$의 ELISA 실험을 통해 항염증효능을 평가한 결과, 마우스 비장세포에서 IL-6의 경우 1 mg/mL 농도에서 참마 추출물은 대조군과 대비하여 27.17% IL-6 생성을 감소시켰으며, 명아주 추출물은 72.30%의 감소를 나타내었다. $TNF-{\alpha}$의 경우 참마 추출물은 61.97%, 명아주 추출물은 77.85%로 유의성 있는 $TNF-{\alpha}$생성 감소 효능을 나타내었다. 이 결과들을 통하여 참마와 명아주 추출물은 항산화, 항염증 효능을 가지고 있으며, 이를 활용하여 항염증에 효과가 있는 천연물 제제에 응용 가능성이 있음을 확인하였다.

경합 Enzyme-Linked Immunosorbent Assay에 의한 대두 및 대두가공제품 중의 Bowman-Birk Protease Inhibitors의 함량 분석 (Quantification of Bowman-Birk Protease Inhibitors in Soybeans and Soybean Products by Competitive Enzyme-Linked Immunosorbent Assay)

  • 김성란;손동화;김수일;홍희도
    • Applied Biological Chemistry
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    • 제42권4호
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    • pp.310-316
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    • 1999
  • 대두가공제품 중에 존재하는 Bowman-Birk protease inhibitor(BBPI) 함량을 protease 저해활성 측정 및 경합 Enzyme-Linked Immunosorbent Assay(ELISA)로 살펴보았다. 항체제조를 위한 BBPI는 ion exchange chromatography와 전기영동 후 gel slicing 방법으로 시판 soybean trypsin-chymotrypsin inhibitor로부터 순수, 분리하였다. 순수분리한 BBPI를 면역원으로 rabbit anti-BBPI antibody를 조제하였으며 단백질 농도별 titration방법으로 BBP에 비교적 선택적으로 결합하는 항체임을 확인하였다. 이를 이용한 경합 ELISA 방법으로 BBPI를 정량하기 위한 표준 정량곡선을 작성하였으며 시료용액중의 BBPI 함량이 $0.03{\sim}30\;{\mu}g/ml$ 범위일 경우에 정량적인 분석이 가능하였다. 대두품종별 chymotrypsin 저해활성은 $8,462{\sim}12,428\;U/g$이었으며 BBPI 함량은 $482{\sim}692\;mg%$ 이었다. 시판 대두 가공제품 중에서 5종의 콩나물은 건물량 기준으로 $10,695{\sim}13,249\;U/g$의 chymotrypsin 저해활성과 $529{\sim}803\;mg%$의 BBPI 함량을 나타내었으며 일부 두부제품에서도 68.9 mg%정도의 BBPI가 검출되었다. 그 밖의 두유, 된장, 고추장 및 간장 등의 대두발효식품, 탈지대두박 등에서는 chymotrypsin 저해활성 및 BBPI가 거의 검출되지 않았다.

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Production and Characterization of Monoclonal and Recombinant Antibodies Against Antimicrobial Sulfamethazine

  • Yang, Zheng-You;Shim, Won-Bo;Kim, Min-Gon;Lee, Kyu-Ho;Kim, Keun-Sung;Kim, Kwang-Yup;Kim, Cheol-Ho;Ha, Sang-Do;Chung, Duck-Hwa
    • Journal of Microbiology and Biotechnology
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    • 제17권4호
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    • pp.571-578
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    • 2007
  • A monoclonal antibody (mab) against the antimicrobial sulfamethazine was prepared and characterized by an indirect competitive enzyme-linked immunosorbent assay (IC-ELISA). Sulfamethazine in the range of 0.2 and 45ng/ml could be determined with the mab by IC-ELISA. cDNAs encoding a variable heavy chain and variable light chain of the mab were cloned to produce recombinant antibodies using phage display technology. Following phage rescue and three rounds of panning, a single-chain variable fragment (scFv) antibody with high sulfamethazine-binding affinity was obtained. ELISA analysis revealed that scFv antibody and parent mab showed similar, but not identical, characteristics. The $IC_{50}$ value by IC-ELISA with scFv antibody was 4.8ng/ml, compared with 1.6ng/ml with the parent mab. Performances of the assays in the presence of milk matrix were compared; the mab-based assay was less affected than the scFv-based assay. Sixty milk samples were analyzed by mab-based IC-ELISA, and four samples were sulfamethazine positive; these results were favorably correlated with those obtained by HPLC.

Production and Characterization of a Monoclonal Antibody Against Enrofloxacin

  • Chusri, Manaspong;Wongphanit, Pitikarn;Palaga, Tanapat;Puthong, Songchan;Sooksai, Sarintip;Komolpis, Kittinan
    • Journal of Microbiology and Biotechnology
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    • 제23권1호
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    • pp.69-75
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    • 2013
  • Enrofloxacin is a fluoroquinolone antibiotic approved for the treatment of infections in animals. Because of the side effects to consumers of animal products, the maximum residue limits (MRLs) of enrofloxacin in animal tissues for consumption are regulated. In this study, a monoclonal antibody (mAb) against enrofloxacin was prepared and characterized for the development of a direct competitive enzyme-linked immunosorbent assay (ELISA). The obtained mAb, Enro44, was highly specific for enrofloxacin and had a 50% inhibition concentration ($IC_{50}$) of 1.99 ng/ml in a competitive ELISA, and the limit of detection (LOD) was 0.50 ng/ml. The cross-reactivity of the mAb with other quinolones and fluoroquinolones was lower than 0.01%. The subclass of the mAb Enro44 was identified as IgG1. The antigen (Ag)-captured direct competitive ELISA using the mAb Enro44 was tested on different spiked samples, including chicken muscle, cattle milk, and cattle urine, and the assay demonstrated recoveries of 82-112%, 80-125%, and 78-124%, respectively. Furthermore, the quantitation of enrofloxacin obtained from the ELISA and from high-performance liquid chromatography (HPLC) was in good agreement, with the linear regression coefficient between 0.933 and 1.056. The cDNAs encoding a heavy-chain Fd fragment (VH and CH1) and a light chain of the mAb Enro44 were cloned and sequenced. Taken together, the results obtained reveal a potential use of this mAb in an ELISA for the detection of enrofloxacin in food samples. The information of amino acid sequence of this mAb will be useful for further modification and production of the mAb in a bioreactor.

Detection of a Thermal Stable-Soluble Protein (TSSP) as a Marker of Peanut Adulteration Using a Highly Sensitive Indirect Enzyme-Linked Immunosorbent Assay based on Monoclonal Antibodies

  • Sol-A Kim;Sazzad Hossen Toushik;Jeong-Eun Lee;Won-Bo Shim
    • Journal of Microbiology and Biotechnology
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    • 제33권9호
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    • pp.1170-1178
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    • 2023
  • Food allergy represents a severe problem for many societies, including sensitive populations, academies, health authorities, and the food industry. Peanut allergy occupies a special place in the food allergy spectrum. To prevent consumption by consumers suffering from a peanut allergy, a rapid and sensitive detection method is essential to identify unintended peanut adulteration in processed foods. In this study, we produced four monoclonal antibodies (MAbs; RO 3A1-12, PB 4C12-10, PB 5F9-23, and PB 6G4-30) specific to thermo-stable and soluble proteins (TSSPs) of peanut and developed an enzyme-linked immunosorbent assay (ELISA) based on the MAbs. Among them, PB 5F9-23 MAb was firmly bound to Ara h 1, and other MAbs strongly reacted to Ara h 3 in the Western blot analysis. An antibody cocktail solution of the MAbs was used to enhance the sensitivity of an indirect ELISA, and the limit of detection of the indirect ELISA based on the antibody cocktail solution was 1 ng/ml and improved compared to the indirect ELISA based on the single MAb (11 ng/ml). The cross-reaction analysis revealed the high specificity of developed MAbs to peanut TSSPs without cross-reaction to other food allergens, including nuts. Subsequently, analyzing processed foods by indirect ELISA, all foods labeled as containing peanuts in the product description were confirmed to be positive. The results indicate that the developed antibodies exhibit high specificity and sensitivity to peanuts and can be used as bio-receptors in immunoassays or biosensors to detect intentional or unintentional adulteration of peanuts in processed foods, particularly heat-processed foods.

Development of an ELISA for the Detection of Fenazaquin Residues in Fruits

  • Lee, Jae-Koo;Kim, Yun-Jung;Lee, Eun-Young;Kim, Dae-Kyu;Kyung, Kee-Sung
    • Journal of Applied Biological Chemistry
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    • 제48권1호
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    • pp.16-25
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    • 2005
  • To develop an enzyme-linked immunosorbent assay (ELISA) for the detection of the residues of the acaricide fenazaquin, five haptens were synthesized and assessed. A competitive indirect format was used with polyclonal antibodies. Under an optimized condition using the selected rabbit C antiserum, an $IC_{50}$ of $96.97\;ng{\cdot}ml^{-1}$, the detection range of $14.9{\sim}631\;ng{\cdot}ml^{-1}$, and the lowest detection limit of $8\;ng{\cdot}ml^{-1}$ were obtained. Some structurally related compounds of practical use showed low crossreactivities to the antibody. Highest cross-reactivity observed with hapten IV indicates that the antiserum C recognizes very well quinazoline ring, 4-tert-butylphenyl, and an adequate length of spacer arm. The length of spacer arm affected recognition of quinazoline ring and 4-tert-butylphenyl moieties. When applied to apple and pear, recoveries were within acceptable ranges of $93.18{\sim}104.77%$ (n = 4) and $79.40{\sim}111.95%$ (n = 4), respectively.