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Bovine Tuberculosis (IFN-γ) ELISA Kit

Bovine Tuberculosis Ab ELISA Kit is an IFN-γ-ELISA principle to detect the presence of antibody to Tuberculosis in the bovine blood. Within 10minutes read the absorbance at 450nm using 630nm as the reference wavelength if available.


Specification:192 tests/kit

Description

Kit Components

SN

Components

2 × 96 T

1

Microtiter plate

12 strips×8 wells

2

Wash Buffer (PBST 20×)

30 mL

3

Negative Control

1tube

4

Positive Control

1tube

5

Antibody Solution

10 mL

6

HRP enzyme

10mL

7

Sample Diluent

25 mL

8

Substrate Solution (TMB)

20 mL

9

Stop Solution

20 mL

10

BPPD (Bovine-PPD) 0.3mg/mL

1

11

APPD(Avian-PPD) 0.3mg/mL

1


Sample Preparation

(1) 5mL Blood collected by venipuncture should be allowed to clot naturally and completely.

(2) Samples are shipped to laboratory at the room temperature  (18-25℃) .

(3) Samples is cultured within 30hours, the sooner, the better. Don’t put blood in the refrigerator any way.


ELISA procedure

1. Blood Cultured:

(1) Put bovine whole blood (at least 5mL) into a heparin anticoagulant tube, mix several times with gentle shaking to dissolve the heparin. Transport to the laboratory at room temperature (22°C ±3°C), and culture within 30 hours after collection.

(2) Dispense 1.5mL anticoagulant blood into each well of 24-well culture plates (Figure1), add 100μL of PBS, APPD and BPPD to corresponding well.

24well  Cell plate

1

2

3

4

5

6

A

Bovine-1

PBS

Bovine-1

APPD

Bovine-1

BPPD

Bovine-2

PBS

Bovine-2

APPD

Bovine-2

BPPD

B

Bovine-3

PBS

Bovine-3

APPD

Bovine-3

BPPD

Bovine-4

PBS

Bovine-4

APPD

Bovine-4

BPPD

C

Bovine-5

PBS

Bovine-5

APPD

Bovine-5

BPPD

Bovine-6

PBS

Bovine-6

APPD

Bovine-6

BPPD

D

Bovine-7

PBS

Bovine-7

APPD

Bovine-7

BPPD

Bovine-8

PBS

Bovine-8

APPD

Bovine-8

BPPD

Figure1: Incubate blood


(3) Incubate 24-well cell culture plates at 37°C for 16-24 hours.

(4) Collect plasma: centrifuge cell culture plate at 500 g/r for 10min,transfer 500μL to 96 well microplate(Figure2).

1A: Bovine-1 APPD , 1B=Bovine-1 BPPD

C7,C8,C9, and G7,G8, G9 as for Positive Control and Negative Control.

96 T

1

2

3

4

5

6

7

8

9

10

11

12

A

1P

1A

1B

2P

2A

2B

3P

3A

3B

4P

4A

4B

B

5P

5A

5B

6P

6A

6B

7P

7A

7B

8P

8A

8B

C

9P

9A

9B

10P

10A

10B

11P

11A

11B

D

12P

12A

12B

13P

13A

13B

14P

14A

14B

15P

15A

15B

E

16P

16A

16B

17P

17A

17B

18P

18A

18B

19P

19A

19B

F

20P

20A

20B

21P

21A

21B

22P

22A

22B

23P

23A

23B

G

24P

24A

24B

25P

25A

25B

26P

26A

26B

H

27P

27A

27B

28P

28A

28B

29P

29A

29B

30P

30A

30B

Figure2: Numbering samples


2. ELISA analysis

(1) Return the solution in the kit to the room temperature  (18-25℃).

(2) Add 50μL Sample Diluent to each well.

(3) Add 50μL of each plasma sample, negative control, the positive control was in the corresponding well, shake slightly for 1min, seal plate and incubate at room temperature (20-25 °C) for 60 min.(Avoid sunlight and air entering the well).

(4) Discard the liquid , add 250μL washing buffer to wash plate for 6 times. Pat the hole dry the last time.

(5) Add 50μL Antibody solution to each well, then add 50μL HRP enzyme conjugate to each well,shake slightly for 1min, seal plate and incubate at room temperature (20-25 °C) for 60 min.

(6) Discard the liquid , add 250μL washing buffer to wash plate for 6 times. Pat the hole dry the last time.

(7) Add 100μL substrate respectively, incubate at 20-25℃ for 10 min.

(8) Add 100μL stop solution and read data at 450nm with 5min-10min .

Result Analysis

1) Test validation

Absorbance values of the positive control and negative control must follow the specification below:

   Positive control OD value ≧1.0

   Negative control OD value<0.1


2) Evaluation

Positive Sample:

   OD 450-PBS of BPPD ≧0.2 and OD450- APPD of BPPD≧0.2.

Negative Sample:

   OD 450-PBS of BPPD <0.2 or  OD450- APPD of BPPD<0.2 .

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