INTRUMENTASI BIOTEKNOLOGIidk121.weblog.esaunggul.ac.id/wp-content/.../PPT-UEU-Instrumentasi… ·...
Transcript of INTRUMENTASI BIOTEKNOLOGIidk121.weblog.esaunggul.ac.id/wp-content/.../PPT-UEU-Instrumentasi… ·...
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INTRUMENTASI BIOTEKNOLOGIProgram Studi Bioteknologi
Oleh: Seprianto, S.Pi, M.Si
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Meeting 8
Serology EquipmentElisa (Mikroplate reader, mikroplate washer)Elipsot ReaderMultichannel pipetWestern Blot transfer
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Tujuan Perkuliahan
• Mengidentfikasi alat serologi: mikroplate reader, mikroplate washer, Elispot reader dan multichannel pipet
• Mengetahui prinsip bekerjanya alat-alat tersebut Mengidentfikasi alat serologi: western blot
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Elisa (Enzyme-linked immunosorbent assay)
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Introduction of Elisa
• Enzyme Linked Immunosorbent Assay (ELISA)
• Term Was Coined By Engvall and Pearlmann in 1971
• Similar To RIA, Except No Radiolabel
• Can Be Used To Detect Both Antibody and Antigen
• Very Sensitive, pg/mL
• Relies on Monoclonal Abs
• ELISA may be run in a qualitative or quantitative format.
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• Antigen bound to ELISA plate • Specific antibodies bind to antigen • Antibodies conjugated with an enzyme • Addition of substrate results in a colored product • Intensity of color detected by ELISA reader or
spectrophotometer • Both antigen & antibody can be coated onto polystyrene
plates • Both antigen & antibodies can be conjugated with enzyme
Principle ELISA
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• Adsorption:The process of adding an antigen/antibody, diluted in buffer, so it attaches to the solid phase on incubation.
• Washing: The simple flooding & emptying of wells with a buffered solution to separate bound from un-bound reagents in ELISA
Basic Terms:
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• Antigen: Any molecule that elicits the production of antibodies when introduced into body.
• Antibodies: Proteins produced in response to antigenic stimuli.
• Enzyme conjugate: An enzyme that is attached irreversibly to an antibody. e.g: Horse-redish peroxidase (HRPO).
Basic Terms:
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• Chromogen: A chemical alters color as a result of an enzyme interaction with substrate (color reaction used as signal) e.g Trimethyl benzidine(TMB).
• Stopping: The process of stopping the action of an enzyme on a substrate.
• Reading: Spectrophotometric measurement of color developed in ELISA
Basic Terms:
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ELISA
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ELISA
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ELISA
Mikroplate
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ELISA
Elisa Multimode REader
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Visualisasi ELISA
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Visualisasi ELISA
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Indirect ELISA /kromogenik
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CMV/HFF Antigen
HRP Conjugated
anti Human IgG
Anti-CMV Ab
ELISA well
1. Add CMV and HFF antigen and incubate overnight at 4°C
2. Wash wells three times and add blocking buffer
3. After 1 hours incubation, Wash wells three times then add samples, QC and Standard
4. After 2 hours incubation, Wash wells three times then add Horse radish peroxidase
5. After 1 hours incubation in the dark, Wash wells five times then add substrate (TMB) then incubate 10 minutes in the dark6. Add stop solution
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Concentration (pg/mL)
Standard curve
QC (QUALITY CONTROL): Nilai QC dibandingkan di tiap plate
Blank :Pelarut tanpa sampel
STANDARD:Sudah di ketahui konsentrasinya
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Result Analysis 1 2 3 4 5 6 7 8 9 10 11 12
A Std 1 Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
Std 1
B Std 2 Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
Std 2
C Std 3 Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
Std 3
D Std 4 Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
Std 4
E Std 5 Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
Sample
1:300
QC
1:300
Std 5
F Std 6 Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
Sample
1:900
QC
1:900
Std 6
G Std 7 Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
Sample
1:2700
QC
1:2700
Std 7
H Blank Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
Sample
1:8100
QC
1:8100
Blank
Std Std
Sampel 1-10
Sampel 11-19 QC
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• ELISA results are reported as a number using a
spectrophotometer, spectrofluorometer, or
other optical device.
• Unknowns that generate a signal that is
stronger than the known sample are called
"positive"; those that generate weaker signal
are called "negative.
Result Analysis
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• Standards Are Diluted in Blocking Buffer/Tween
• Start By Labeling eight, 1 mL EppendorfTubes
• Prepare Highest Conc. Tube (1 mL)
• Fill The Remaining Tubes with 0.5 mLBlocking Buffer
• Serially Dilute From Top To Lowest
Standard Preparation
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Standard Preparation
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Advantages of ELISA: It can be used on most type of biological samples like plasma,
serum, urine, cell extracts. Less costly and safest. Easy visualization of results with high level of accuracy. Specific and highly sensitive assay that can detect protein at the
picomolar to nanomolar range. Easily automated for performance of large numbers of tests. Require minimal reagents. Qualitative detection or Quantitative measurement of either
antigen or antibody. Wells can be coated with antigens or antibodies. Can be done by personnel with only minimal training.
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Disadvantages of ELISA:
• Measurement of enzyme activity can be more complex than the measurement of activity of some type of radioisotopes.
• Enzyme activity may be affected by plasma constituents. • Kits are not cheap. • Very specific to particular antigen but won’t recognize other
antigens. • False positive/ negative possible, especially with mutated/
altered antigen.
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Applications of ELISA
Analysis of hormones, vitamins, metabolites,
and diagnostic markers.
Therapeutic drug monitoring.
Diagnostic procedures for detecting infection.
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Western BlotReaksi antara antibodi dengan antigen pada membrane nitrocellulose dg terlebih dahulu memisahkan antigen tsb menurut berat molekul (MW dalam Da atau kDa) (Ernawati, 2015)
Western blot untuk protein, Southern blot untuk DNA dan Northern blot untuk RNA
• Tahapan dalam western blot– Elektroforesis protein dengan SDS-PAGE (sodium
dodecyl sulfate polyacrylamide gel electrophoresis)
– Transfer protein ke membran– Deteksi protein dengan antibodi spesifik
terhadap protein target. (Antibodi terkonjugasi dengan streptavidin-hrp)
– Penambahan substrat
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Western BlotSDS PAGE (Sodium dodecyl sulfate polyacrylamide gel electrophoresis
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